Mails.so vs MillionVerifier (2026): which should you pick?
As of Nov 13, 2026, MillionVerifier grades higher than Mails.so: 2.4 against 2.2 out of 4.0.
Checked Oct 18, 2026 and Nov 13, 2026 · graded Oct 18, 2026 and Nov 13, 2026 by ToolGPA
MillionVerifier grades higher on ease of use. They get the same grade on value for money, the free plan, features and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
Mails.so
Email validation API and list checker with flat monthly plans
MillionVerifier
Low-cost bulk email verification with credits that never expire
Which one is for you
Pick Mails.so if
- Fits if you want a flat monthly price instead of buying packs
- Works for people who also want an email finder
Look elsewhere if
- Watch out: the 90% first-month discount lasts one month, then the plan renews in full
- Skip it if you want a free plan, since it's 50 credits once
- Pricey if you validate small amounts, as plans start at €48 a month
- Watch out: prices were read in euros and the dollar price is unconfirmed
Pick MillionVerifier if
- Fits if you clean hundreds of thousands of addresses at once, at $449 a million
- Works for cleaning now and then, as the credits never expire
Look elsewhere if
- Tight if you need fewer than 10,000 checks, the smallest regular pack
- Not for you if you want EverClean's price up front, as it isn't published and it works only through integrations
- Skip it if you need warm-up, inbox placement tests or DMARC tools as well
- Watch out: there's no monthly credit plan, only an auto top-up that buys a new pack when the balance runs low
How we grade them
| 2.2GPAMails.soFair | 2.4GPAMillionVerifierFair | |
|---|---|---|
| Value for money | C€48 a month for 10,000 validations, which is near the category's $49 dearer quarter once converted. The dollar price is unconfirmed. | C$39 for a one-off 10,000, and credits never expire. Among its listed rivals DeBounce ($25) and Clearout ($32 a month billed yearly) cost less at that size. At a million checks it's $449, where Bouncer charges $2,000. |
| Free plan and trial | C50 free credits on sign-up with no card, once. No monthly free plan. | CNo free plan, but 100 free credits with no card, and the help centre lists 500 for business-email sign-ups. Enough to test, not to clean a list. |
| Features | CList validation, an API and an email finder. Only the three paid plans are listed, with no pay-as-you-go pack. | CIt does the checking job fully: files, imports from email platforms, an API, refunds on unsure results and EverClean's daily rechecks. That's a smaller job, though: no warm-up, placement tests or DMARC, and EverClean's price isn't published. |
| Ease of use | CNo store rating on record. You upload lists or use the API. | BNo App Store rating on record, but nothing to set up: upload a CSV, TXT or XLSX file, or import from your email platform, and download it sorted into good, risky and bad. |
| Platforms and integrations | BWeb and API with Mailchimp and HubSpot links. No apps. | BWeb and a REST API, with more than 40 connections including Mailchimp, HubSpot, ActiveCampaign, SendGrid, Mailgun, Zoho CRM and Pipedrive, plus an n8n node. No phone or desktop app. |
| Best for | an email validation API with flat monthly plans | cleaning lists of hundreds of thousands |
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: Mails.so and MillionVerifier. How we grade
Where they differ
At a glance
| Mails.so | MillionVerifier | |
|---|---|---|
| Pricing | Free trial | Free trial |
| Starts at | €48 per month for 10,000 validations, shown in euros | $39 one-time for 10,000 credits |
| Free plan | None | None |
| Free trial | 50 free credits on sign-up, no credit card required | 100 free credits with no card; the help center lists 500 for business-email sign-ups |
| Web | ||
| Made by | Mails, Inc. | GBD Software as a Service Private Limited Company |
| Price read from | mails.so | millionverifier.com |
| Checked | Nov 13, 2026 | Oct 18, 2026 |
Worth knowing
Mails.so
- Prices were read in euros; a US dollar view could not be read, so the dollar price is unconfirmed.
- The 90% first-month discount applies to the first month only; the plan then renews at full price.
- The free allowance is a one-time 50 credits, not a monthly free plan.
- Only the three paid plans were listed; there is no separate pay-as-you-go pack on the page.
MillionVerifier
- There is no monthly credit plan; auto top-up buys a new pack when the balance runs low.
- EverClean has its own monthly fee based on list size, which the site does not publish, and works only through integrations.
- Verification only: no warm-up, inbox placement tests or DMARC tools.
- The smallest regular pack is 10,000 credits; a 2,000-credit pack for $4.90 is a one-time trial option.
Key features
Mails.so
- List validation
- Upload a list to check its addresses, or paste single addresses into the checker on the homepage.
- Validation API
- Every paid plan includes API access, for checking addresses at signup or inside other software.
- Email finder
- An email finder is included on all three paid plans.
- Mailchimp and HubSpot integrations
- Listed on every paid plan for cleaning lists held in those platforms.
- Top-ups
- Extra validations can be bought at any time on Pro and Business at a stated per-validation rate.
MillionVerifier
- Bulk list verification
- Upload a CSV, TXT or XLSX file, or import a list from a connected email platform, and download it sorted into good, risky and bad addresses.
- Risky email refund
- Credits spent on addresses it cannot verify for certain, such as unknown and catch-all results, are returned.
- Real-time API
- A REST API checks addresses at the sign-up form and can flag disposable and role-based addresses.
- EverClean
- Rechecks the lists in a connected Mailchimp, HubSpot, ActiveCampaign or other account every day and can unsubscribe bad addresses automatically.
- Integrations
- More than 40 connections to email and CRM tools, plus an n8n node for automated workflows.
Plans
Mails.so
Pro€48
per month for 10,000 validations
First month €4.80 (90% off). 5 concurrent validations; top-ups at €0.005 per validation.
Business€98
per month for 50,000 validations
First month €9.80 (90% off). 5 concurrent validations; top-ups at €0.002 per validation.
Unlimited€498
per month for unlimited validations
First month €49.80 (90% off). 10 concurrent validations.
MillionVerifier
Pay as you go$39
one-time for 10,000 credits
Credits never expire. Larger packs: $89 for 50,000, $149 for 100,000, $449 for 1 million and $2,599 for 10 million.
Volume pricingCustom
Custom prices for more than 50 million credits.
Ways to pay less
Mails.so
- Other savings
90% off the first month
The homepage shows each paid plan at 90% off for the first month, then at full price. No end date is shown.
MillionVerifier
- Other savings
10% extra credits with auto top-up
Accounts with auto top-up switched on get 10% extra credits on every payment, manual or automatic.
- Other savings
1 million free credits per 5 million bought
For every 5 million credits purchased, counting past purchases, MillionVerifier adds 1 million credits free.
Common questions
Which is cheaper, Mails.so or MillionVerifier?
As of Nov 13, 2026, Mails.so starts at €48 per month for 10,000 validations, shown in euros, and MillionVerifier starts at $39 one-time for 10,000 credits.
Which has a free plan, Mails.so or MillionVerifier?
As of Nov 13, 2026, neither Mails.so nor MillionVerifier has a free plan. Both have a free trial.
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.