# Bouncer

> Bouncer is a Polish email verification platform, founded in Wroclaw in 2017, that verifies lists and single addresses through a web app and API, hashes uploaded addresses everywhere except the download layer, stores data only in EU AWS data centres, and deletes results after 60 days or on demand. It publishes a complete price table from $8 per 1,000 credits down to $0.002 at one million, never expires credits, never charges for duplicates or unknown results, and backs its work with a guarantee of over 99 percent accuracy, 98 percent coverage, 100 percent accuracy on undeliverables, and a refund for any address marked deliverable that bounces within 72 hours.

- Category: Email Verification (https://saastracker.org/categories/email-verification)
- Website: https://www.usebouncer.com
- Starting price: $8 for 1,000 credits, with 100 free credits on signup
- Free plan: 100 free credits on signup, plus a free single-address checker and a free list sampling tool that need no account.
- Free trial: No time-limited trial; 100 free credits with no credit card required
- Founded: 2017, HQ: Wroclaw, Poland, Ownership: Privately held, seed-stage venture backing reported
- Profile last reviewed: 2026-08-22
- Canonical profile: https://saastracker.org/products/bouncer

## Overview

Bouncer's founding argument is a stance about errors. Most verifiers optimise to minimise the unknown bucket, because a low unknown rate looks like accuracy on a comparison table. Bouncer deliberately does the opposite: it accepts a slightly larger unknown bucket, capped at around 2 percent, in exchange for never telling you an address is dead when it is alive. Its CEO says so plainly, calling the company biased against false negatives on the grounds that a lost real contact costs more than an extra unknown. That is a coherent position and it is the opposite of BounceBan's.

The commercial terms follow the same logic. Duplicates are never billed, unknown results are never billed, and credits never expire, so what you pay for is answers. The price table is published in full rather than hidden behind a calculator: 1,000 credits for $8, 10,000 for $60, 100,000 for $400, and a million for $2,000. That puts Bouncer in the middle of the market, cheaper than ZeroBounce and NeverBounce, more expensive than MillionVerifier, DeBounce, and Reoon.

Around the verifier sits a wider product than the price suggests. Bouncer Shield checks addresses at the point of entry on a form, from $2 per 1,000 monthly checks. AutoClean connects to a CRM and keeps it clean without manual uploads. Toxicity Check scores addresses one to five for the risk of hitting spam traps, complainers, litigators, or widely circulated breach data, using the same BLACKBOX dataset that large email service providers rely on. Data Enrichment adds public company information. The Deliverability Kit, from $25 to $250 a month, covers inbox placement testing, authentication verification, and blocklist monitoring. Email Engagement Insights reports how active a contact is in their inbox at all.

For European buyers the data posture is the quiet advantage. Uploaded addresses are hashed in every part of the system except the layer you download from, everything is hosted in EU AWS data centres, results are erased after 60 days or immediately on request, and a data processing agreement is published rather than requested. A company headquartered in Wroclaw and hosted in the EU is an easier sell to a European legal team than a US vendor offering an EU routing option, and Bouncer knows it.

## How it works

1. You upload a list to the web app, connect an integration, or call the verification API. Bouncer runs its checks and returns one of three plain verdicts: deliverable, meaning safe to send; undeliverable, meaning a bounce; or unknown, meaning it could not reach a confident conclusion and refuses to guess.

2. The unknown bucket is the design decision. Bouncer targets roughly 98 percent coverage, so about 2 percent of a list is left unresolved, usually because of temporary misconfiguration, provider oddities, or genuine ambiguity. Those rows are not charged. Neither are duplicates, which the system removes before billing.

3. The guarantee sits behind the deliverable verdict. Bouncer claims over 99 percent accuracy overall and 100 percent accuracy on undeliverables, and it commits to refunding contacts marked deliverable that bounce within 72 hours of verification for an objective reason. That is a narrower and more testable promise than a generic accuracy percentage.

4. For ongoing use, Bouncer Shield validates addresses at the moment someone types them into a form, AutoClean re-verifies a connected CRM continuously, and the Deliverability Kit runs inbox placement tests, authentication checks, and blocklist monitoring as a separate monthly subscription. Toxicity Check and Data Enrichment run as extra passes over an already verified list.

## Best for

European small and mid-sized businesses, agencies, and SaaS companies that want a verifier with EU-only hosting, a published DPA, hashed storage, and a written accuracy guarantee, at mid-market pricing rather than either budget or enterprise rates.

## Not the right fit for

- Buyers chasing the lowest possible per-credit price; at $400 per 100,000 addresses Bouncer costs roughly two and a half times MillionVerifier and three times Reoon.
- Outbound teams whose central problem is recovering catch-all addresses, because Bouncer's whole philosophy is to return unknown rather than to guess aggressively.
- Organisations that require a HIPAA business associate agreement or US-only data residency; the hosting story is deliberately and exclusively European.
- Teams wanting one vendor for verification and deliverability at a single price, since the Deliverability Kit is a separate $25 to $250 monthly subscription on top of credits.
- Very small one-off jobs where even the $8 minimum purchase is more process than a free single-address checker would require.

## Features

### Verification and accuracy guarantee

A three-verdict model with an unusually specific commitment behind it.

- **Deliverable, undeliverable, unknown**: Three plain verdicts rather than a long status taxonomy, with unknown used deliberately whenever there is real doubt rather than treated as a failure metric.
- **Ninety-eight percent coverage target**: Bouncer aims to leave only about 2 percent of a list unresolved, and states it would rather return unknown than risk discarding a live contact.
- **One hundred percent undeliverable accuracy claim**: The company commits that an address marked undeliverable really is undeliverable, so no genuine customer is lost to a false negative.
- **Seventy-two hour bounce refund**: If an address marked deliverable bounces within 72 hours of verification for an objective reason, Bouncer refunds the credits for those contacts.
- **Bulk and single verification**: The same engine covers a list of millions or a single address checked in the free public tool.
- **Free email list sampling**: A sampling tool estimates the health of a list before you commit credits to verifying all of it.

### Risk scoring beyond deliverability

The part that separates an address that exists from an address you should mail.

- **Toxicity Check**: Scores addresses one to five for the likelihood of being a spam trap, complainer, litigator, or widely circulated breached address, which is a different risk from bouncing.
- **BLACKBOX dataset access**: Bouncer states its toxicity data draws on the same database of harmful addresses used by the largest email service providers.
- **Email Engagement Insights**: Reports how active a contact is across their inbox generally, so you can suppress addresses that exist but never open anything.
- **Data Enrichment**: Appends publicly available company information to verified addresses, turning a hygiene pass into a light enrichment pass.

### Real-time and continuous protection

Stopping bad addresses at the door rather than cleaning up after them.

- **Bouncer Shield**: Form-level validation that blocks invalid, malicious, and fraudulent addresses at the moment of entry, priced separately from $2 per 1,000 monthly checks.
- **Bouncer AutoClean**: Connects to a CRM, runs on a configured schedule, and keeps the contact base verified without anyone exporting a file.
- **Email Verification API**: A documented API for single and batch verification, positioned for engineers and available on the same credit balance.
- **Native integrations**: Direct connections to common marketing platforms so verification runs where the list already lives.

### Deliverability Kit

A separate subscription that turns the verifier into a fuller deliverability posture.

- **Inbox placement testing**: Shows whether mail lands in the inbox, promotions, or spam across providers before a campaign goes out.
- **Authentication verification**: Checks SPF, DKIM, and DMARC setup, which is where most unexplained placement problems actually originate.
- **Blocklist monitoring**: Watches sending domains and IPs against blocklists so a listing is caught early rather than after a campaign underperforms.
- **Tiered monthly pricing**: Sold from $25 to $250 a month depending on volume, entirely separately from verification credits.

### Data handling and commercial terms

The European posture, stated concretely rather than as marketing language.

- **Hashed storage**: Uploaded email addresses are hashed and anonymised in every part of the system except the layer from which you download your results.
- **EU-only hosting**: Data is stored exclusively in EU AWS data centres, and the company is headquartered and operated from Wroclaw, Poland.
- **Sixty-day deletion**: Verification results are erased after 60 days automatically, and can be permanently deleted on demand at any time before that.
- **Published DPA**: A data processing agreement is published alongside the privacy policy rather than issued only on request.
- **No charge for duplicates or unknowns**: Bouncer states it will never charge for duplicated addresses within a list, nor for results returned as unknown.
- **Credits never expire**: Purchased credits have no expiry date, so a block bought for one campaign can sit until the next one.

## Use cases

- **European SaaS company with a German enterprise client**: The client's legal team asks where subscriber email addresses are processed and how quickly they are deleted, and a US vendor's EU routing option does not satisfy them. Outcome: Bouncer is EU-headquartered, hosts only in EU AWS data centres, hashes addresses everywhere except the download layer, deletes after 60 days, and publishes a DPA, which answers the question without a negotiation.
- **Agency that cannot afford to discard live contacts**: A previous verifier marked several hundred addresses undeliverable that later turned out to be real customers, and the client noticed. Outcome: Bouncer's stated 100 percent accuracy on undeliverables and its deliberate use of the unknown verdict mean the agency stops losing contacts to false negatives, at the cost of a small unresolved bucket.
- **Marketer who inherited a list of unknown provenance**: The list bounces acceptably but the sending domain keeps drifting toward blocklists, which suggests spam traps rather than dead mailboxes. Outcome: Toxicity Check scores each address one to five against the BLACKBOX dataset, and the Deliverability Kit's blocklist monitoring confirms whether the remedy worked.
- **Product team blocking fake signups**: Disposable and malformed addresses are entering the user table and generating transactional bounces that damage the sending reputation. Outcome: Bouncer Shield validates at the form from $2 per 1,000 monthly checks, and AutoClean keeps the CRM verified afterwards without manual work.

## Pricing

Prepaid verification credits on a fully published volume ladder with no expiry, plus two separately priced subscriptions: Bouncer Shield for real-time checks and the Deliverability Kit for placement and monitoring.

- **Small volumes**: $8 to $60 one-time credit purchase. 1,000 credits for $8, which is $0.008 each; 5,000 credits for $35, which is $0.007 each; 10,000 credits for $60, which is $0.006 each; Credits never expire. 1,000 credits is the minimum purchase, which is the lowest entry point of any vendor in this comparison set.
- **Mid volumes**: $250 to $750 one-time credit purchase. 50,000 credits for $250, which is $0.005 each; 100,000 credits for $400, which is $0.004 each; 250,000 credits for $750, which is $0.003 each; Duplicates and unknown results are never billed.
- **Large volumes**: $1,250 to $2,000 one-time credit purchase. 500,000 credits for $1,250, which is $0.0025 each; 1,000,000 credits for $2,000, which is $0.002 each; Enterprise arrangements available above that. The ladder is published in full, which makes budgeting straightforward compared with vendors that hide it in a calculator.

Add-ons:

- Bouncer Shield (From $2 per 1,000 monthly checks): Real-time form validation, billed separately from verification credits.
- Deliverability Kit ($25 to $250 per month): Inbox placement tests, authentication verification, and blocklist monitoring.
- Toxicity Check (Charged against verification credits): One to five risk scoring against the BLACKBOX dataset.
- Data Enrichment (Charged against verification credits): Appends publicly available company information.

Billing notes:

- The full ladder is published: $8 per 1,000, $35 per 5,000, $60 per 10,000, $250 per 50,000, $400 per 100,000, $750 per 250,000, $1,250 per 500,000, and $2,000 per one million.
- At the three reference volumes that is $0.006 per address at 10,000, $0.004 at 100,000, and $0.002 at one million.
- Credits never expire, and neither duplicates nor unknown results consume them, so the effective rate is better than the sticker rate by whatever your duplicate and unknown share happens to be.
- Bouncer Shield and the Deliverability Kit are separate monthly subscriptions rather than credit consumers, so a full deployment runs three meters at once.
- The 72-hour bounce refund is a credit remedy for contacts marked deliverable that bounce for an objective reason, not a blanket money-back guarantee on the purchase.

Value assessment: Bouncer sits deliberately in the middle and mostly earns it. At $400 per 100,000 addresses it costs about a third of ZeroBounce and roughly two and a half times MillionVerifier, and what it buys with that premium over the budget tier is a published guarantee with a specific remedy, EU-only hashed storage with 60-day deletion, and a $1,000-per-million rate at scale that stays competitive. The entry point matters too: a 1,000-credit minimum at $8 is the cheapest way in the category to genuinely test a vendor on real data. Where the value slips is the unbundling. Shield and the Deliverability Kit are separate subscriptions, so the fully-equipped version of Bouncer is not the mid-market bargain the credit table suggests.

## Strengths

- The most specific accuracy guarantee in the category: over 99 percent accuracy, 98 percent coverage, 100 percent accuracy on undeliverables, and a credit refund for deliverables that bounce within 72 hours.
- An explicit philosophical position, biased against false negatives, that is stated by the CEO on a public page and reflected in how the unknown verdict is used.
- EU-only hosting in EU AWS data centres, addresses hashed everywhere except the download layer, automatic 60-day deletion, on-demand permanent deletion, and a published DPA.
- The complete price ladder is published rather than hidden behind a calculator, and credits never expire.
- Neither duplicates nor unknown results are billed, so you pay only for conclusions.
- A wider product than the price implies: Shield for form-level protection, AutoClean for CRM hygiene, Toxicity Check with BLACKBOX data, Data Enrichment, Engagement Insights, and the Deliverability Kit.
- A 1,000-credit minimum at $8 makes real evaluation cheap, and free single-address checking plus free list sampling need no account at all.

## Limitations

- Mid-market pricing: $400 per 100,000 is two and a half to three times what MillionVerifier, DeBounce, or Reoon charge for the same core job.
- The deliberate 2 percent unknown bucket means catch-all-heavy B2B lists will leave more addresses unresolved here than at vendors that guess aggressively.
- Bouncer Shield and the Deliverability Kit are separate subscriptions, so the advertised credit price is not the full cost of a complete deployment.
- No HIPAA programme and no US data residency option, which closes the door on some American regulated buyers by design.
- The site's compliance story centres on GDPR by design and EU hosting; certification evidence such as SOC 2 or ISO reports is discussed in company content rather than presented as a public trust centre with downloadable artefacts.
- The team is small, in the low tens of people, which is fine operationally but means limited coverage for large enterprise engagements.
- Toxicity, enrichment, and engagement data are extra passes that consume credits, so a thorough hygiene programme costs more per address than the headline verification rate.

## Comparisons

- **Bouncer vs ZeroBounce**: ZeroBounce is the certification-heavy American option with HIPAA, SOC 2 Type 2, ISO 27001, owned data centres, and a much broader suite, at $649 per 100,000 against Bouncer's $400. Bouncer answers with EU-only hosting, hashed storage, 60-day deletion, a sharper written guarantee, and better economics at every volume. For European buyers and for anyone who values a specific remedy over a long certification list, Bouncer is the better purchase; for healthcare, US enterprise, or full-suite consolidation, ZeroBounce.
- **Bouncer vs Emailable**: Emailable is the closest competitor on positioning: SOC 2 Type II, a 99 percent deliverability guarantee, 250 free credits, non-expiring credits, and verification speeds of 100,000 addresses in under three minutes, anchored at $38 for 5,000. Bouncer counters with EU-only hosting, a fully published price ladder, and a guarantee that names an exact remedy and window. Choose Emailable for raw speed and a US-certified vendor; choose Bouncer for European data handling and pricing transparency.
- **Bouncer vs MillionVerifier**: MillionVerifier is roughly two and a half times cheaper at 100,000 addresses, gives you catch-alls and unknowns free rather than unknowns alone, and refunds your last payment if hard bounces exceed 4 percent. Bouncer offers EU hosting, hashed storage, a 72-hour bounce remedy, Toxicity Check, and a real product team behind it. If price is the deciding factor, MillionVerifier; if a European legal review or a written accuracy promise is, Bouncer.
- **Bouncer vs BounceBan**: These two disagree about the same problem. BounceBan pushes hard into catch-all ambiguity and claims to resolve 85 to 95 percent of it; Bouncer holds back and returns unknown rather than risk a false negative. If your accept-all bucket is where your pipeline lives, BounceBan is the specialist. If losing a genuine contact is the expensive error and EU data handling matters, Bouncer is the safer instrument, and some teams run BounceBan only on the segment Bouncer leaves unresolved.

## Implementation

- Setup time: Under fifteen minutes. Sign up, take the 100 free credits, upload a list or copy an API key. Bouncer Shield needs a snippet on the form and AutoClean needs a CRM connection, each an hour at most.
- Learning curve: Low. Three verdicts instead of a status taxonomy makes the output immediately usable, and the unknown bucket is explained rather than treated as an embarrassment. Toxicity scores take a little longer to internalise because the one-to-five scale is a risk gradient rather than a pass or fail.
- Onboarding: Fully self-serve at every published volume, with a 1,000-credit minimum that makes a real trial affordable. Enterprise and deliverability consulting engagements exist for larger deployments but are not required to buy or use the product.
- Migration: Expect a larger unknown bucket than your previous vendor produced, and read that as the design working rather than as a coverage failure. Because unknowns and duplicates are not billed, the shift usually costs less than the raw volume suggests. If the reason for switching is European data residency, note that the entire platform is EU-hosted rather than offering an EU option, so there is no endpoint to configure.

## Platform, API & security

- Platforms: Web application, REST API, Bouncer Shield form widget, AutoClean CRM connector, Native integrations
- API: Documented email verification API for single and batch checks, marketed for engineers as ultrafast and easy to integrate, drawing on the same credit balance as the web app. A public status page is published.
- Compliance: GDPR by design with a published data processing agreement, EU-only data storage
- Data residency: Data is stored only in EU AWS data centres. The company is headquartered in Wroclaw, Poland and states it hosts exclusively in the EU.
- SSO: Not published as a standard plan feature.
- Security notes: Uploaded email addresses are hashed and anonymised in all parts of the system except the layer from which results are downloaded. Verification results are erased after 60 days automatically, and users can permanently delete results on demand at any time. A data processing agreement and privacy policy are published, and the company writes publicly about SOC 2 in the context of email validation, though the public site's compliance evidence is centred on GDPR and EU hosting rather than a downloadable certification pack.

## Support

- Channels: Live chat, Email, Video call, Postal mail, seriously offered on the GDPR page
- Documentation: Public documentation covering the app, API, Shield, and AutoClean, plus a status page, FAQ, and a knowledge hub.
- Community: No user forum. There is an agency partner programme, an ambassador scheme, webinars, case studies, and an unusually active blog.

## Company

- Founded: 2017
- Founders: Radek Kaczynski
- Headquarters: Wroclaw, Poland
- Ownership: Privately held, seed-stage venture backing reported
- Employees: Small team, in the low tens (public estimates, 2026)
- Funding: Reported as a seed-stage company; no large funding rounds are publicly disclosed.

Timeline:

- 2017: Founded in Wroclaw, Poland by Radek Kaczynski, building an email verification service with EU-only hosting from the outset.
- 2019: Ships the email verification API and native integrations, positioning as a developer-friendly alternative to upload-only tools.
- 2021: Adds Toxicity Check with BLACKBOX dataset access, extending from deliverability into spam-trap and complainer risk.
- 2023: Launches Bouncer Shield for real-time form validation and the Deliverability Kit for placement testing, authentication checks, and blocklist monitoring.
- 2024: Introduces AutoClean for continuous CRM hygiene and Email Engagement Insights for inbox activity signals.
- 2026: Publishes the Bouncer Guarantee formally: over 99 percent accuracy, 98 percent coverage, 100 percent accuracy on undeliverables, and a 72-hour bounce refund.

## Integrations

Email Verification API, Bouncer Shield form widget, Bouncer AutoClean CRM connector, Mailchimp, HubSpot, ActiveCampaign, Brevo, Klaviyo, Zapier, Native connectors to major marketing platforms

## FAQ

### What is Bouncer?

Bouncer is an email verification platform founded in Wroclaw, Poland in 2017. It verifies lists and single addresses through a web app and API, adds form-level protection with Bouncer Shield, continuous CRM hygiene with AutoClean, spam-trap risk scoring with Toxicity Check, and a separate Deliverability Kit covering inbox placement, authentication, and blocklist monitoring. All data is hosted in EU AWS data centres.

### How much does Bouncer cost per email?

The full ladder is published: $8 for 1,000 credits, $35 for 5,000, $60 for 10,000, $250 for 50,000, $400 for 100,000, $750 for 250,000, $1,250 for 500,000, and $2,000 for one million. That is $0.006 per address at 10,000, $0.004 at 100,000, and $0.002 at one million. The minimum purchase is 1,000 credits and new accounts get 100 free.

### Do Bouncer credits expire?

No. Credits never expire. Bouncer also states it will never charge for duplicated addresses within a list, nor for results returned as unknown, so the effective cost per usable answer is lower than the per-credit rate implies.

### How does Bouncer handle catch-all addresses?

Conservatively, and on purpose. Where a check cannot reach confidence, including on many accept-all domains, Bouncer returns unknown rather than guessing. The company targets about 98 percent coverage, meaning roughly 2 percent unknowns, and its CEO states explicitly that it would rather return unknown than risk telling you a live contact is dead. If maximum catch-all recovery is what you need, BounceBan or MillionVerifier attack that segment more aggressively.

### What is the Bouncer Guarantee?

Four commitments: over 99 percent accuracy in identifying safe addresses, 98 percent coverage with only about 2 percent unknowns, 100 percent accuracy on undeliverables so no real contact is discarded, and a full refund of credits for any address marked deliverable that bounces within 72 hours of verification for an objective reason. Spam-related bounces are excluded.

### Is Bouncer GDPR compliant and where is my data stored?

Bouncer describes itself as GDPR compliant by design. Uploaded email addresses are hashed and anonymised in every part of the system except the layer you download results from, data is stored only in EU AWS data centres, results are erased automatically after 60 days, and you can permanently delete them on demand at any time. A data processing agreement is published alongside the privacy policy.

### What is Toxicity Check?

A separate scoring pass that rates addresses one to five for the risk of being a spam trap, a serial complainer, a litigator, or a widely circulated breached address. Bouncer states it draws on the same BLACKBOX database used by major email service providers, and it deliberately reports toxicity as a gradient rather than claiming to identify spam traps precisely, on the grounds that the useful traps are not publicly known.

### Is there a free plan?

New accounts receive 100 free credits with no credit card. There is also a free single-address email checker and a free list sampling tool that estimates list health before you spend credits, neither of which requires an account. There is no recurring free monthly allowance.

### What is Bouncer Shield and how is it priced?

Shield is real-time validation at the point of entry, blocking invalid, malicious, and fraudulent addresses as someone types them into a form. It is priced separately from verification credits, starting at $2 per 1,000 monthly checks, so a full deployment of Bouncer plus Shield plus the Deliverability Kit runs three separate meters.

### Who should choose Bouncer over a cheaper verifier?

European companies that need EU-only hosting and a published DPA, teams that have been burned by a verifier discarding live contacts, and anyone who wants a written remedy rather than a bare accuracy percentage. If none of those apply and price is the deciding factor, MillionVerifier at $149 per 100,000 or DeBounce at $135 does the core job for a fraction of the money.

## Editorial verdict

Bouncer is the most thoughtfully positioned verifier in this set. Its stated bias against false negatives, its 100 percent undeliverable accuracy claim, and its 72-hour bounce refund make a promise that can actually be tested, which is more than most accuracy percentages in this category amount to. The European data posture, hashed storage, EU-only AWS hosting, 60-day deletion, and a published DPA, is concrete rather than performative, and the fully published price ladder with non-expiring credits and no billing for duplicates or unknowns is exactly the transparency the category usually avoids. The costs are real too: $400 per 100,000 is well above the budget tier, the deliberate unknown bucket leaves catch-all-heavy lists partly unresolved, and Shield and the Deliverability Kit are separate subscriptions that quietly undo the mid-market pricing. For a European small business that wants to buy verification once, understand the bill, and never lose a live contact to a wrong verdict, this is the right default.

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Source: SaaSTracker (https://saastracker.org), an independent editorial project. This profile is compiled from public information, carries no peer reviews or paid placement, and was last reviewed 2026-08-22. Awards are judged on published criteria: https://saastracker.org/methodology