ListWise vs mailfloss
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
The short answer
Both sides assessedListWise compared with mailfloss
Mailfloss built a company around the feature ListWise includes quietly: fixing typos rather than deleting the subscriber. But Mailfloss goes much further, running inside your ESP on autopilot with real-time signup blocking, daily sweeps, and scheduled decay protection across forty-plus platforms from $29 a month. ListWise is a better raw cleaner; Mailfloss is a better ongoing process. A newsletter should probably run Mailfloss and a bulk list owner should run ListWise.
mailfloss compared with ListWise
ListWise includes automatic typo fixing quietly as part of its clean, which is the one feature mailfloss built a company around. But ListWise is a file-in, file-out bulk service with no ESP integrations at all, where mailfloss connects natively to forty platforms and runs continuously. ListWise is the better one-off cleaner and considerably cheaper for a large list; mailfloss is the better ongoing process. A bulk list owner should take ListWise, a newsletter operator mailfloss.
Choose ListWise if
Bulk email marketers and list owners who want a straightforward prepaid clean with a flat published price, strong greylisting handling, typo repair, and explicit spam-trap and no-reply detection, from a company with three decades of trading history and a physical address you can look up.
Choose mailfloss if
Newsletter operators, ecommerce email marketers, and small businesses running a permission-based list inside a supported ESP, who want list hygiene to be a background process rather than a recurring manual chore, and who care about keeping mistyped subscribers rather than deleting them.
Side by side
13 attributes| Attribute | ListWise | mailfloss |
|---|---|---|
| Category | Verification | Verification |
| Starting price | $0 to clean up to 1,000 addresses, then $45 for 10,000 prepaid or $44 per month (free plan available) | $29 per month for 10,000 credits, with a seven-day free trial (free plan available) |
| Pricing model | Three separate published ladders: one-off prepaid credits that never expire, recurring monthly plans that are cheaper per address, and Premium monthly plans that add the real-time single-address API. All prices in USD and exclusive of tax. | Monthly or annual subscriptions priced by verification credits per month, with each tier carrying a volume selector, plus a separate one-time prepaid credit option with credits that never expire for teams on unsupported platforms or doing a one-off bulk clean. |
| Free plan | No ongoing free plan. The free allowance is a one-time 1,000-address clean, which is ten times the category convention. | No permanently free plan. The seven-day trial and the money-back guarantee are the risk-free paths. |
| Free trial | Clean up to 1,000 email addresses free, uploaded as a CSV or text file, before paying anything | Seven days on every subscription plan; a card is required but no charge occurs until day eight |
| Best for | Bulk email marketers and list owners who want a straightforward prepaid clean with a flat published price, strong greylisting handling, typo repair, and explicit spam-trap and no-reply detection, from a company with three decades of trading history and a physical address you can look up. | Newsletter operators, ecommerce email marketers, and small businesses running a permission-based list inside a supported ESP, who want list hygiene to be a background process rather than a recurring manual chore, and who care about keeping mistyped subscribers rather than deleting them. |
| Setup time | Minutes for a bulk clean, and the free 1,000-address trial needs no payment details. There is no integration work at all on the standard plans, because the workflow is upload a file and download a file. A Premium API integration is a normal REST job. | Under a minute for the connection itself. OAuth from the dashboard, no API keys, no developer, and the vendor claims most platforms connect in under thirty seconds. The configuration that actually matters, deciding what gets deleted and what gets tagged, deserves rather longer. |
| Learning curve | Very low. There are no quality levels, credit multipliers, or configuration decisions on the standard product. The one thing to understand before purchase is which of the three ladders you are on, because the API sits only on the most expensive one. | Low. The four products map to obvious moments in a subscriber's life, and the settings are per connection rather than global. The only real thinking is around removal policy, because the system acts on your live list without asking. |
| Platforms | Web application, CSV and plain text upload, Real-time API on Premium plans, Optional dedicated server deployment | Web dashboard, Native OAuth integrations with 40 ESPs and CRMs, Real-time API, Webhooks, JavaScript form widget, Google Sheets, Airtable, and Zapier extensions |
| Compliance | No published certifications, GDPR addressed through optional dedicated servers hosted in a chosen geography | GDPR compliance (vendor stated), OAuth-based platform authorisation rather than stored API keys |
| Founded | 2013 | 2017 |
| Headquarters | Auckland, New Zealand | Canada |
| Ownership | Owned and operated by CyberCom, a privately held New Zealand company established in 1995 | Bootstrapped and customer-funded; mailfloss, Inc. |
Strengths and limitations
ListWise
Strengths
- Anti-greylisting technology addresses a real and under-served cause of unknown results, and is included in the standard clean rather than sold as a premium retry.
- Automatic typo repair recovers subscribers that stricter verifiers silently delete, and repaired addresses are still verified before they survive.
- The classification set is more specific than most, including no-reply address detection and spam-trap domain detection that almost no competitor publishes separately.
- Flat published price tables across three ladders with no calculator, no gating, and no sales conversation required.
Limitations
- No catch-all resolution. Accept-all domains are detected and flagged as a false-positive risk, and that is where the process stops.
- The real-time API is locked behind Premium plans starting at $408 a month, where competitors include an API on their cheapest packages.
- No named ESP integrations at all. This is a file-in, file-out service, so cleaning inside Mailchimp, Klaviyo, or HubSpot means moving CSVs by hand.
- No published compliance evidence: no SOC 2, no ISO 27001, no trust centre, no data retention policy, and no published security page. Data residency is available only by arranging a dedicated server.
mailfloss
Strengths
- Typo repair across more than 250 patterns is a genuine differentiator with a direct revenue argument, and no other verifier profiled here treats it as a product.
- Forty native two-way OAuth integrations with per-connection rules, which turns list hygiene into a background process instead of a recurring CSV chore.
- The four-product lifecycle coverage, signup-time blocking, next-day sweep, and scheduled decay re-verification, is more complete automation than any other verifier here offers.
- Genuinely cheap entry at $29 a month, from a bootstrapped company that states low pricing as a principle rather than a promotion.
Limitations
- No catch-all resolution at all, which rules out B2B outbound work entirely.
- Subscription plans require one of forty supported platforms, and the fallback for everyone else is prepaid credits and manual CSV uploads, which is the exact workflow the product exists to eliminate.
- Poor value as a bulk cleaner: $209 a month for 125,000 credits against roughly $100 to $190 for a one-off clean of the same volume elsewhere.
- No permanently free tier, and the seven-day trial requires a card, which is less generous than the daily free credits at MyEmailVerifier and Verifalia.
Pricing compared
ListWise
Three separate published ladders: one-off prepaid credits that never expire, recurring monthly plans that are cheaper per address, and Premium monthly plans that add the real-time single-address API. All prices in USD and exclusive of tax.
- Free trial clean$0
- Prepaid credits$45 to $15,995
- Monthly plans$44 to $2,559
- Premium plans$408 to $1,010
ListWise prices its bulk cleaning fairly and its API expensively. At around $0.0016 to $0.0019 per address on a 100,000-row clean, the bulk product sits in the sensible middle of the market and buys you real technical substance: a live SMTP handshake on every address, anti-greylisting retries, automatic typo repair, and explicit spam-trap and no-reply detection, from a company that has been trading since 1995 and publishes a street address and a phone number. That is a better combination than the plain website suggests. The Premium API pricing is harder to defend, because $408 a month for 100,000 real-time checks is a large premium in a market where EmailListVerify and MyEmailVerifier include an API on their cheapest packages. Buy ListWise for bulk cleaning where its greylisting and typo handling earn their keep, and think carefully before buying it for programmatic use.
mailfloss
Monthly or annual subscriptions priced by verification credits per month, with each tier carrying a volume selector, plus a separate one-time prepaid credit option with credits that never expire for teams on unsupported platforms or doing a one-off bulk clean.
- Lite$29
- Business$59
- Pro$209
- Prepaid creditsOne-time purchase
Judge mailfloss on labour and retention, not on price per address. Per credit it is unremarkable, around $0.0017 to $0.0029, which is more than MyEmailVerifier or Truelist charge for a straight bulk clean. What you are buying is that the clean actually happens, every day, inside the platform where your contacts already live, with removals and tags written back automatically, and that mistyped subscribers are repaired rather than deleted. For a marketing team, the recurring cost of forgetting to clean, plus the acquisition spend wasted on deleted typos, plausibly exceeds the subscription. Two conditions have to hold for that to be true: your platform must be among the supported forty, and your list must be permission-based rather than cold. If either fails, mailfloss is the wrong shape and a bulk verifier at a third of the price does the job you actually have.
Editorial verdict on each
ListWise
ListWise is a better product than its website implies and a worse deal than its bulk pricing implies, depending entirely on which ladder you land on. The verification technique is genuinely thoughtful: a live SMTP handshake on every address, anti-greylisting retries that rescue a whole class of unknown results, automatic typo repair that recovers subscribers other verifiers quietly delete, and an unusually specific classification set that separates no-reply and spam-trap domains from the general mush. Behind it sits CyberCom, trading since 1995, with a real Auckland address and a phone number, which counts for something in a field full of anonymous vendors. Against that, it will not resolve catch-alls, it publishes no compliance evidence, it has no ESP integrations at all, and it costs roughly double MyEmailVerifier for the same bulk work. The Premium API at $408 a month is the one part that is hard to justify against a market that gives an API away at the bottom of the ladder. Buy the bulk product if greylisting and typo recovery are real problems on your list; look elsewhere if you need an API, an integration, or the lowest price.
Read the full ListWise profilemailfloss
mailfloss solves a different problem from every other verifier in this category, and it solves it well. The others answer the question is this address valid. mailfloss answers the question why is nobody cleaning this list, and its answer is to connect natively to forty platforms, run four automations continuously across the whole subscriber lifecycle, and write every removal, tag, and typo correction straight back where your contacts already live. The Typo Fixer alone is a defensible reason to buy it, because repairing a mistyped address keeps a customer you paid to acquire and every competitor simply deletes them. It is cheap, it is bootstrapped, and it has been doing this since 2017. The boundaries are clear and worth respecting: no catch-all resolution, so B2B outbound teams should look elsewhere entirely, and no value as a bulk cleaner, since $209 a month buys volume that a one-off competitor cleans for less. If you run a permission-based list inside a supported ESP and list hygiene is nobody's actual job, this is the right purchase and $29 a month is not a serious sum.
Read the full mailfloss profileListWise profile last reviewed 2026-08-22; mailfloss last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.