Mail-Tester vs MailerCheck
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 assessedMail-Tester compared with MailerCheck
Adjacent rather than competing. MailerCheck is primarily list verification at a cent per address, with inbox placement and email insights costing 200 credits a test. Mail-Tester does not verify lists at all; it checks whether a message and its sending setup are clean. A team doing outbound properly needs both jobs done, and the combination is cheap: free daily scores from Mail-Tester plus $10 of MailerCheck credits covers a small programme's pre-send checks entirely.
MailerCheck compared with Mail-Tester
Adjacent jobs rather than rival ones. MailerCheck verifies lists at a cent an address and charges 200 credits for an inbox placement or insights test. Mail-Tester verifies nothing and tests placement at no named provider; it scores whether a message and its sending setup are technically clean, free three times a day. A small outbound programme needs both, and the combination is genuinely cheap: $10 of MailerCheck credits plus Mail-Tester's free allowance covers the pre-send checks for months.
Choose Mail-Tester if
Anyone who needs a fast, credible answer to whether a specific message is technically clean before sending it, and developers who want that answer inside their own product through an API or an embedded, white-labelled result page.
Choose MailerCheck if
Newsletter senders, lifecycle marketers, and small teams on ESPs like MailerLite or Mailchimp who want cheap, non-expiring, pay-as-you-go list verification with occasional placement and content checks, and no monthly deliverability subscription to justify.
Side by side
13 attributes| Attribute | Mail-Tester | MailerCheck |
|---|---|---|
| Category | Deliverability | Deliverability |
| Starting price | $0 (3 tests per 24 hours), then $10 per month for 50 tests | $10 (1,000 credits, pay as you go) (free trial) |
| Pricing model | Free for three tests every 24 hours with no account. Paid subscriptions are priced by monthly test volume, with one-time payment options alongside, and the per-test rate falls as volume rises. Quotas reset monthly and do not roll over. | Pure pay-as-you-go credits: $0.01 per credit with a 1,000-credit minimum purchase, no subscription tiers, and credits that never expire. Verification costs 1 credit per address; Email Insights and Inbox Placement cost 200 credits per test. |
| Free plan | Three tests in any rolling 24 hours with no account and no card, results kept for seven days, plus free SPF, DKIM, DMARC, and BIMI lookup tools. | No |
| Free trial | No separate trial; the free three tests a day serve as the evaluation path and do not expire | 10 free credits on signup, no credit card required |
| Best for | Anyone who needs a fast, credible answer to whether a specific message is technically clean before sending it, and developers who want that answer inside their own product through an API or an embedded, white-labelled result page. | Newsletter senders, lifecycle marketers, and small teams on ESPs like MailerLite or Mailchimp who want cheap, non-expiring, pay-as-you-go list verification with occasional placement and content checks, and no monthly deliverability subscription to justify. |
| Setup time | Under a minute for the free test, with nothing to install or connect. An API or white-label integration is a few hours of developer time. | Minutes: sign up, use the 10 free credits, buy a credit pack, and upload a list or connect an ESP. API integration at a signup form is a small engineering task measured in hours. |
| Learning curve | Very low to run, moderate to interpret. The report itemises deductions clearly, but knowing which of them genuinely matter, and which are SpamAssassin being pedantic about a template, takes a little experience. | Low. Verification verdicts and automated recommendations are written for marketers, not deliverability specialists; Insights and Placement reports are similarly plain. |
| Platforms | Web application, JSON API, iframe embed | Web app, REST API (verification, including real-time) |
| Compliance | None published | GDPR-aligned processes (EU-rooted organization) |
| Founded | 2014 | 2019 |
| Headquarters | France | Vilnius, Lithuania (MailerLite group; MailerCheck's own registered base is not separately published) |
| Ownership | Privately held; the operating company is not named publicly | Owned by Vercom S.A. (listed Polish email-infrastructure group) via its 2022 acquisition of MailerLite |
Strengths and limitations
Mail-Tester
Strengths
- Three genuinely free tests every 24 hours with no account, which is the lowest-friction real answer available anywhere in this category.
- Built on SpamAssassin, so deductions name a specific rule rather than an opaque proprietary score.
- Tests your actual sending path, because you send from the system you will really use rather than through a relay.
- Covers authentication, blacklists, links, HTML, and server configuration in one report rather than across four tools.
Limitations
- It scores a message against a filter; it does not test inbox placement at Gmail, Outlook, and Yahoo the way GlockApps, Unspam, or a seed-list product does.
- No monitoring of any kind. It answers when asked and watches nothing in between, so reputation drift is invisible to it.
- No warming, no sending, and no reputation management, so it is always one tool in a stack rather than the stack.
- The operators publish almost nothing about themselves: no company name, no founders, no location beyond being French, and no compliance documentation.
MailerCheck
Strengths
- Lowest-friction pricing in the category: $10 minimum, flat cent per verification, non-expiring credits, and 10 free credits with no card to start.
- Verification, content analysis, and placement testing in one credit wallet covers the pre-send checklist most marketers actually run.
- Real-time API verification at the signup form prevents list decay at the source rather than billing you to clean it later.
- Native integrations with the small-sender ESP stack (MailerLite, Mailchimp, ActiveCampaign, GetResponse, ConvertKit) plus Zapier and Make make round-trip list cleaning nearly frictionless.
Limitations
- No warming, no continuous blacklist monitoring product, and no DMARC analytics; senders with reputation problems need other tools for remediation and deep diagnosis.
- Inbox Placement is a per-test prediction across major providers, shallower than GlockApps' seed panels with per-filter spam scoring and scheduled monitoring.
- Catch-all addresses are flagged, not conclusively resolved, which limits usefulness on enterprise B2B lists where catch-alls dominate.
- No published volume discounts; at a flat cent per check, million-address workloads price worse than negotiated rates at dedicated bulk verifiers.
Pricing compared
Mail-Tester
Free for three tests every 24 hours with no account. Paid subscriptions are priced by monthly test volume, with one-time payment options alongside, and the per-test rate falls as volume rises. Quotas reset monthly and do not roll over.
- Free$0
- 50 tests a month$10
- 500 tests a month$25
- 2,000 tests a month$80
- 7,500 tests a month$250
Judged as a free tool, Mail-Tester is the best value in this category and it is not close: three real tests a day, built on SpamAssassin, with no account, covers the entire pre-send checking need of a small sender at no cost. Judged as a paid product it is narrow but priced honestly, and the buyers who get the most from it are not individuals at all but products embedding the report through the API and white-label. What it does not do should decide the purchase: no placement testing at named providers, no monitoring, no warming. If the question is whether this specific message is technically clean, nothing is faster or cheaper. If the question is where your mail is landing at Gmail this week, you need GlockApps, Unspam, or a warming platform with testing built in.
MailerCheck
Pure pay-as-you-go credits: $0.01 per credit with a 1,000-credit minimum purchase, no subscription tiers, and credits that never expire. Verification costs 1 credit per address; Email Insights and Inbox Placement cost 200 credits per test.
- Pay as you go$0.01 per credit
For its core job, MailerCheck is close to unbeatable on friction: $10 in, a cent per address, nothing expiring, and no subscription guilt for the months you send nothing. That makes it the rational default for small and seasonal senders, and the $2 placement and content tests are honest conveniences at that scale. The flat rate cuts the other way at volume, where dedicated verifiers negotiate below a cent and testing-heavy teams outgrow the per-test meter; and because nothing here warms, monitors continuously, or parses DMARC, MailerCheck is the hygiene-and-spot-check layer of a deliverability stack, never the whole stack.
Editorial verdict on each
Mail-Tester
Mail-Tester earns its place in any deliverability stack by being free, fast, and specific. Three tests a day with no account, a score out of ten backed by SpamAssassin, and a report that names the exact rule costing you points is the cheapest useful thing a sender can do before launching a campaign, and the paid tiers are honestly priced for the agencies and products that run it at volume. The API, white-labelling, and micro-payment resale explain why the tool turns up inside other vendors' products, and make it a genuine build-versus-buy answer for anyone adding deliverability checks to their own software. Understand the boundary before relying on it: this is a technical cleanliness check, not a placement test and not a monitor. A ten out of ten tells you nothing about which Gmail tab you landed in, and nothing at all about next week. Use it constantly, for free, alongside a warming and monitoring platform that covers what it deliberately does not.
Read the full Mail-Tester profileMailerCheck
MailerCheck wins on economics and honesty of scope. A cent per verification, a $10 entry, non-expiring credits, and $2 spot checks on content and placement make it the obvious hygiene layer for newsletter and lifecycle senders who refuse to carry another subscription, and the MailerLite pedigree gives it more institutional weight than most tools this cheap. But its scope is exactly what it says: it cleans lists and runs spot checks. It will not warm a domain, watch your blacklists overnight, parse DMARC, or resolve the catch-alls that dominate enterprise B2B data. Treat it as the cheapest reliable answer to the list-quality question, and buy the reputation and measurement layers, if you need them, elsewhere.
Read the full MailerCheck profileMail-Tester profile last reviewed 2026-09-20; MailerCheck last reviewed 2026-09-20. Pricing is compiled from public sources and can change without notice. See our methodology.
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Frequently asked questions
6 questionsWhat is the difference between Mail-Tester and MailerCheck?
Adjacent rather than competing. MailerCheck is primarily list verification at a cent per address, with inbox placement and email insights costing 200 credits a test. Mail-Tester does not verify lists at all; it checks whether a message and its sending setup are clean. A team doing outbound properly needs both jobs done, and the combination is cheap: free daily scores from Mail-Tester plus $10 of MailerCheck credits covers a small programme's pre-send checks entirely.
Is Mail-Tester or MailerCheck cheaper?
Mail-Tester starts at $0 (3 tests per 24 hours), then $10 per month for 50 tests. MailerCheck starts at $10 (1,000 credits, pay as you go) (free trial). The billing models differ, so the entry price is rarely the whole cost. Mail-Tester pricing model: Free for three tests every 24 hours with no account. Paid subscriptions are priced by monthly test volume, with one-time payment options alongside, and the per-test rate falls as volume rises. Quotas reset monthly and do not roll over. MailerCheck pricing model: Pure pay-as-you-go credits: $0.01 per credit with a 1,000-credit minimum purchase, no subscription tiers, and credits that never expire. Verification costs 1 credit per address; Email Insights and Inbox Placement cost 200 credits per test.
Does Mail-Tester or MailerCheck have a free plan?
Mail-Tester has a free plan. Three tests in any rolling 24 hours with no account and no card, results kept for seven days, plus free SPF, DKIM, DMARC, and BIMI lookup tools. Trial terms: No separate trial; the free three tests a day serve as the evaluation path and do not expire. MailerCheck has no free plan. Trial terms: 10 free credits on signup, no credit card required.
Who should choose Mail-Tester?
Anyone who needs a fast, credible answer to whether a specific message is technically clean before sending it, and developers who want that answer inside their own product through an API or an embedded, white-labelled result page.
Who should choose MailerCheck?
Newsletter senders, lifecycle marketers, and small teams on ESPs like MailerLite or Mailchimp who want cheap, non-expiring, pay-as-you-go list verification with occasional placement and content checks, and no monthly deliverability subscription to justify.
What are the best alternatives to Mail-Tester and MailerCheck?
SaaSTracker profiles 23 products in Email Deliverability & Warming. The Summer 2026 awards in the category went to MailReach (Category Leader), GlockApps (Best Value), InboxDoctor (Momentum). Every profile is compiled from primary sources, so a shortlist can be built from pricing, limitations, and fit rather than from star ratings.
