MailTester.ninja vs Reoon Email Verifier (2026): which should you pick?
As of Nov 13, 2026, we pick Reoon Email Verifier: it is first in our ranking of email verification and deliverability tools, and it grades higher too, 2.8 against 2.2.
Checked Nov 12, 2026 and Nov 13, 2026 · graded Nov 12, 2026 and Nov 13, 2026 by ToolGPA
Reoon Email Verifier grades higher on value for money, the free plan and features. They get the same grade on ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
MailTester.ninja
Real-time email verifier and finder with a REST API
Reoon Email Verifier
Bulk and real-time email verification with refunds on unknowns
Which one is for you
Pick MailTester.ninja if
- Fits if you want a steady stream of live checks from an API
- Works for people who check a few addresses by hand on the free site
Look elsewhere if
- Tight if you work in bursts, as requests over the daily limit are refused until the next day
- Skip it if you want credits that carry over, since plans are priced by daily limit
- Watch out: Starter is billed weekly, and the monthly plans are Pro and Ultimate
- Watch out: free API calls are 10 or 50 a day, one every 30 seconds
- Watch out: a catch-all domain's accepted address is not proof the mailbox exists
Pick Reoon Email Verifier if
- Fits if you check a few hundred addresses a month
- Works for WordPress sites that want to check sign-ups
Look elsewhere if
- Tight if you stay free, as it is 20 credits a day
- Watch out: daily credits do not carry over, and they are spent before instant credits
- Watch out: it offers no guarantee of finding spam traps, since only known ones can be matched
- Watch out: there is only a dashboard and API, no apps
How we grade them
| 2.2GPAMailTester.ninjaFair | 2.8GPAReoon Email VerifierGood | |
|---|---|---|
| Value for money | CPro is $23.99 a month, and the weekly Starter is $6.99, about $30 a month. The category's middle is $23. | B$11.90 for 10,000 instant credits, and the daily-credit plan starts at $9 a month, inside the $10 cheaper quarter of deliverability tools. Packs go to $972 for 1,000,000. |
| Free plan and trial | COne-off checks on the site are free with no signup. The free API allows 10 checks a day, or 50 with a 7-day token, one request every 30 seconds. | BEvery account gets 20 daily credits plus 100 at sign-up, with no card needed. That is 600 checks a month. |
| Features | CLive mailbox check, verdict codes, finder and tools. An accepted address on a catch-all domain cannot be confirmed to exist. | BBulk list verification, a real-time API, status and score, spam trap checks and a WordPress plugin. Nothing in the listing is missing from the core job. |
| Ease of use | CNo rating on record. Paste an address or call the API; the daily-limit model needs some thought. | CNo store rating on record. You upload a list or use the API, a few steps. |
| Platforms and integrations | BWeb only, but with a REST API, SDKs, an MCP server and a list of integrations. | BWeb and API with a WordPress plugin. No desktop or phone app. |
| Best for | checking addresses through a daily-limit API | email checks with daily free credits |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: MailTester.ninja and Reoon Email Verifier. How we grade
Price against what you get
MailTester.ninja starts at $30.29 a month and scores 2.3 out of 4 on features, ease of use and platforms. Reoon Email Verifier starts at $9 a month and scores 2.7.
Reoon Email Verifier scores higher and starts $21.29 a month lower. Of the other email verification and deliverability tools on the chart, 7 score higher than MailTester.ninja for less, and none scores higher than Reoon Email Verifier for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
At a glance
| MailTester.ninja | Reoon Email Verifier | |
|---|---|---|
| Pricing | Free plan | Free plan |
| Starts at | $6.99 per week for up to 100,000 checks a day; $23.99 per month for the same limit | $9 per month for 500 daily credits |
| Free plan | One-off checks on the website are free with no signup. The API allows 10 checks a day with key=free, or 50 a day with a free token valid for 7 days. | Every account gets 20 daily credits (up to 600 verifications a month) plus 100 instant credits at sign-up, with no card required. |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Unlimited & Limited | Reoon Technology |
| Price read from | mailtester.ninja | reoon.com |
| Checked | Nov 13, 2026 | Nov 12, 2026 |
Worth knowing
MailTester.ninja
- Free API calls are limited to one request every 30 seconds, and 10 or 50 checks a day.
- Plans are priced by a daily limit, not a credit balance: requests above it are refused until the next day.
- Starter is billed weekly; the monthly plans are Pro and Ultimate.
- An accepted address on a catch-all domain cannot be confirmed to exist.
Reoon Email Verifier
- The free allowance is 20 credits a day; daily credits do not roll over.
- Daily-credit subscriptions and instant-credit packs are separate products, and daily credits are spent first.
- The vendor offers no guarantee of detecting spam traps, since only known ones can be matched.
- Web dashboard and API only; there is no desktop or mobile app.
Key features
MailTester.ninja
- Live mailbox check
- Each address is tested against the recipient's mail server (syntax, DNS, MX and an SMTP handshake). No message is sent, and the page says no copy of the address is kept.
- Verdict codes
- Results are ok, ko (invalid) or mb (unverifiable), with messages such as Catch-All, Disposable, Greylisted, Timeout and No MX.
- Email finder
- Tries common address formats such as first.last and flast for a name and company domain, and returns the first the server accepts. The Finder API needs a paid key.
- REST API, SDKs and MCP server
- Two endpoints, an OpenAPI 3.1 spec, JavaScript and Python SDKs and an MCP server for AI agents.
- Deliverability tools
- The site also offers a domain audit report, a sender score test for a sent email and a blocklist checker.
Reoon Email Verifier
- Bulk list verification
- Upload a CSV or paste a list; the page says 10,000 mixed-quality addresses take about 8 to 12 minutes, with results grouped by status.
- Real-time API
- A quick verification mode is meant for sign-up forms, and the page cites a response time of about 0.5 seconds.
- Status and score
- Every address gets a status (safe, role, catch-all, disposable, invalid and others) and an AI-based score out of 100.
- Automatic refund on unknowns
- Credits spent on unknown results are returned automatically, and the credits history shows each refund.
- WordPress form plugin
- A plugin checks addresses when a supported WordPress form is submitted and can block invalid or temporary ones.
- Disposable and spam-trap checks
- Addresses are matched against disposable-domain and known spam-trap lists; the vendor says unknown spam traps cannot be caught.
Plans
MailTester.ninja
Starter$6.99
per week, billed weekly
Up to 100,000 verifications and 100,000 API calls a day. Cancel any time.
Pro$23.99
per month, billed monthly
Up to 100,000 verifications and 100,000 API calls a day.
Ultimate$39.99
per month, billed monthly
Up to 200,000 verifications and 200,000 API calls a day. A quantity above 1 multiplies the limit, so 5 gives 1 million a day.
Reoon Email Verifier
Free$0
100 instant credits at sign-up and 20 daily credits that renew on login.
Daily Credits$9
per month for 500 credits a day
Credits renew daily and unused ones do not carry over; the page lists this as the starting step.
Instant Credits$11.90
one-time, for 10,000 credits used as you go
Credits never expire. Larger packs run to $116.40 for 100,000 and $972 for 1,000,000.
Common questions
Which is cheaper, MailTester.ninja or Reoon Email Verifier?
As of Nov 13, 2026, Reoon Email Verifier is cheaper to start with: $9 a month, against $30.29 a month for MailTester.ninja. MailTester.ninja starts at $6.99 per week for up to 100,000 checks a day; $23.99 per month for the same limit, and Reoon Email Verifier starts at $9 per month for 500 daily credits.
Which has a free plan, MailTester.ninja or Reoon Email Verifier?
As of Nov 13, 2026, both MailTester.ninja and Reoon Email Verifier have a free plan.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.