mailfloss vs Truelist
An independent, review-free comparison compiled by the SaaSTracker editorial team. Both products are profiled in full, and neither can pay for placement here.
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The short answer
Both sides assessedmailfloss compared with Truelist
Truelist is cheaper per address, resolves catch-alls through a three-credit enhanced pass, and offers Recurring Validation on a schedule, but its integration list is short and it is fundamentally an engine you point at a list. mailfloss has forty native two-way connections and real-time signup blocking. Take Truelist for B2B lists and developer control; take mailfloss for an ESP-resident marketing list that should clean itself.
Truelist compared with mailfloss
Mailfloss is automation-first: it lives inside your ESP, fixes typos, blocks bad signups in real time, and re-verifies decayed subscribers on a schedule, from $29 a month. Truelist has Recurring Validation but is fundamentally a validation engine you point at a list or call from code. For a newsletter or ecommerce list that should clean itself with no thought, Mailfloss is the better shape. For B2B lists where catch-all resolution decides how many contacts survive, Truelist is the right tool.
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.
Choose Truelist if
Outbound and lifecycle teams that hit accept-all domains constantly and refuse to delete the risky bucket, plus any team validating above about half a million addresses a month, where Truelist's flat unlimited plan collapses a metered bill into a fixed line item.
Side by side
13 attributes| Attribute | mailfloss | Truelist |
|---|---|---|
| Category | Verification | Verification |
| Starting price | $29 per month for 10,000 credits, with a seven-day free trial | $0 for 100 validations, then $1.40 per 1,000 credits pay-as-you-go, or $799 per month unlimited |
| Pricing model | 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. | Two paths on the same platform: non-expiring pay-as-you-go credits with automatic volume discounts, or flat-rate unlimited monthly plans on a three, six, or twelve month commitment. Standard validation is one credit, enhanced catch-all resolution is three. |
| Free plan | No permanently free plan. The seven-day trial and the money-back guarantee are the risk-free paths. | Free forever: 100 validations, standard plus enhanced catch-all resolution, syntax, DNS and SMTP checks, one team member, no credit card. |
| Free trial | Seven days on every subscription plan; a card is required but no charge occurs until day eight | No time-limited trial; the free plan with 100 validations including enhanced catch-all resolution is the evaluation path |
| Best for | 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. | Outbound and lifecycle teams that hit accept-all domains constantly and refuse to delete the risky bucket, plus any team validating above about half a million addresses a month, where Truelist's flat unlimited plan collapses a metered bill into a fixed line item. |
| Setup time | 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. | The vendor claims under two minutes to get started and that is roughly right for a bulk upload. API integration takes an afternoon with the published SDKs, and connecting Zapier or Make to an ESP is a short configuration job rather than an engineering project. |
| Learning curve | 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. | Low, with one concept to internalise: the difference between a standard credit and a three-credit enhanced resolution, and therefore why two lists of identical length can cost very different amounts. Everything else is the category-standard result vocabulary. |
| Platforms | Web dashboard, Native OAuth integrations with 40 ESPs and CRMs, Real-time API, Webhooks, JavaScript form widget, Google Sheets, Airtable, and Zapier extensions | Web application, REST API, SDKs and client libraries, MCP server, Chrome extension, Zapier, Make |
| Compliance | GDPR compliance (vendor stated), OAuth-based platform authorisation rather than stored API keys | SOC 2 Type II, ISO 27001 compliant (vendor stated), GDPR compliant, TLS 1.2 or higher in transit |
| Founded | 2017 | 2024 |
| Headquarters | Canada | United States (distributed) |
| Ownership | Bootstrapped and customer-funded; mailfloss, Inc. | Privately held and independently operated |
Strengths and limitations
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.
Truelist
Strengths
- Enhanced Validation genuinely attempts catch-all resolution rather than labelling and abandoning it, and it is charged only when it triggers.
- One of the cheapest published credit ladders in the category, at $0.70 to $1.40 per thousand with credits that never expire.
- The flat unlimited plan is a rare and genuinely useful pricing shape for high-volume agencies and platforms, converting a variable meter into a fixed cost.
- SOC 2 Type II, ISO 27001, TLS 1.2 or higher, and GDPR compliance published on the front page, which is an unusually strong posture for a company this young and this small.
Limitations
- Very young company. Truelist launched publicly in late 2024 and is founder-scale, which matters more than usual when the headline offer is a prepaid twelve-month unlimited plan.
- Unlimited is not unlimited for the thing you care about: enhanced catch-all resolutions are capped at 10,000 a month on those plans.
- Unlimited plans bill the entire commitment upfront, so the cheapest rate requires $9,588 in cash on day one.
- Enhanced Validation accuracy is a vendor claim of up to twice the competition, with no published methodology, third-party audit, or breakdown of what the browser-based and third-party data layers actually check.
Pricing compared
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.
Truelist
Two paths on the same platform: non-expiring pay-as-you-go credits with automatic volume discounts, or flat-rate unlimited monthly plans on a three, six, or twelve month commitment. Standard validation is one credit, enhanced catch-all resolution is three.
- Free$0
- Pay-as-you-go credits$1.40 to $0.70
- Unlimited$799 to $999
- EnterpriseFrom $2,000
Truelist is priced like a budget verifier and engineered like a specialist, which is an unusual and favourable combination. At roughly $90 per 100,000 standard validations it undercuts EmailListVerify, sits near MyEmailVerifier, and costs a fifth of Kickbox, and unlike any of them it will actually try to resolve your accept-all addresses rather than shrugging. The three-credit surcharge is the honest way to price that: you pay for the hard work only when the hard work happens. The unlimited plans are the sharper instrument, converting a metered bill into a fixed cost for anyone above roughly a million validations a month, though the upfront billing and the 10,000-per-month enhanced cap both deserve scrutiny before signing. The real risk being priced here is not capability, it is vendor age: this is a company that launched in late 2024 offering flat-rate unlimited plans with a SOC 2 report, and the sensible move is to start on credits and graduate to unlimited only once you have watched the results for a quarter.
Editorial verdict on each
mailfloss
Ease of Usemailfloss 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 profileTruelist
Truelist is the most interesting price-to-capability point in this category right now. It costs less per standard validation than almost every competitor, it actually attempts the catch-all resolution that Kickbox, NeverBounce, and most of the established field decline to touch, it charges for that work only when it happens, and it wraps the whole thing in SOC 2 Type II, ISO 27001, an API, SDKs, an MCP server, and scheduled re-validation. Two things should temper enthusiasm. The company launched in late 2024 and is founder-scale, and the flat-rate unlimited offer, prepaid for up to twelve months, is exactly the shape of commitment that goes wrong if a small vendor stumbles. The right approach is obvious and cheap: take the 100 free validations, run your known-good and known-dead accept-all addresses through them, then buy credits rather than a commitment, and only consider the unlimited plan after a quarter of real usage data. Done that way, Truelist is the first thing most B2B teams should try.
Read the full Truelist profilemailfloss profile last reviewed 2026-08-22; Truelist last reviewed 2026-08-22. Pricing is compiled from public sources and can change without notice. See our methodology.
The best in Email Verification
17 trackedEmail verification services check whether an address exists and will accept mail before you send to it, removing invalid, disposable, and catch-all addresses that would otherwise bounce and damage sender reputation.
The most certified verifier in the category, with the appends, placement tools, and compliance posture the biggest senders require.
Four people, no investors, and the cheapest honest credit in the category.
Refusing to give up on catch-all addresses made BounceBan the verifier the cold email community reached for this cycle.
Verifies risky addresses by actually sending and waiting for the bounce, trading three days for an answer no ping-based verifier can give.
OAuth connections to forty ESPs take under a minute with no developer, then typo repair and daily sweeps run list hygiene automatically.
Frequently asked questions
6 questionsWhat is the difference between mailfloss and Truelist?
Truelist is cheaper per address, resolves catch-alls through a three-credit enhanced pass, and offers Recurring Validation on a schedule, but its integration list is short and it is fundamentally an engine you point at a list. mailfloss has forty native two-way connections and real-time signup blocking. Take Truelist for B2B lists and developer control; take mailfloss for an ESP-resident marketing list that should clean itself.
Is mailfloss or Truelist cheaper?
mailfloss starts at $29 per month for 10,000 credits, with a seven-day free trial. Truelist starts at $0 for 100 validations, then $1.40 per 1,000 credits pay-as-you-go, or $799 per month unlimited. The billing models differ, so the entry price is rarely the whole cost. mailfloss pricing model: 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. Truelist pricing model: Two paths on the same platform: non-expiring pay-as-you-go credits with automatic volume discounts, or flat-rate unlimited monthly plans on a three, six, or twelve month commitment.
Does mailfloss or Truelist have a free plan?
mailfloss has a free plan. No permanently free plan. The seven-day trial and the money-back guarantee are the risk-free paths. Trial terms: Seven days on every subscription plan; a card is required but no charge occurs until day eight. Truelist has a free plan. Free forever: 100 validations, standard plus enhanced catch-all resolution, syntax, DNS and SMTP checks, one team member, no credit card. Trial terms: No time-limited trial; the free plan with 100 validations including enhanced catch-all resolution is the evaluation path.
Who should choose mailfloss?
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.
Who should choose Truelist?
Outbound and lifecycle teams that hit accept-all domains constantly and refuse to delete the risky bucket, plus any team validating above about half a million addresses a month, where Truelist's flat unlimited plan collapses a metered bill into a fixed line item.
What are the best alternatives to mailfloss and Truelist?
SaaSTracker profiles 17 products in Email Verification. The Summer 2026 awards in the category went to ZeroBounce (Category Leader), MillionVerifier (Best Value), BounceBan (Momentum). Every profile is compiled from primary sources, so a shortlist can be built from pricing, limitations, and fit rather than from star ratings.
