Mails.so vs NeverBounce (2026): which should you pick?
As of Nov 13, 2026, NeverBounce 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
NeverBounce 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
NeverBounce
Email list cleaning and real-time verification, now part of ZoomInfo
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 NeverBounce if
- Fits if you want a CRM or email platform rechecked without uploading anything, from $49 a month
- Works for sign-up forms that let through typos like gmai for gmail
Look elsewhere if
- Skip it if you clean once a year, as pay-as-you-go credits expire after 12 months
- Pricey if you want Sync or AI scoring, which need the $49 a month Growth plan
- Not for you if you need warm-up, inbox placement tests or DMARC tools as well
- Tight if you want to try it on a full list, as only test credits and a list analysis are free
How we grade them
| 2.2GPAMails.soFair | 2.4GPANeverBounceFair | |
|---|---|---|
| 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$50 for a one-off 10,000 checks. Among its listed rivals that's under Bouncer and Emailable ($60) and Kickbox ($70), but DeBounce charges $25. And the credits expire 12 months after purchase, where Bouncer's, Emailable's and DeBounce's never do. |
| Free plan and trial | C50 free credits on sign-up with no card, once. No monthly free plan. | CNo free plan, but free test credits and a free analysis of your list, with no card. That shows how messy a list is; it won't clean it. |
| 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: bulk cleaning, a real-time API, typo fixes, the company behind each address and automatic Sync. That's a smaller job, though: no warm-up, placement tests or DMARC, and Sync and AI scoring need Growth. |
| 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 list and get results, with up to 10 lists cleaning at once on pay-as-you-go. |
| Platforms and integrations | BWeb and API with Mailchimp and HubSpot links. No apps. | BWeb and an API, with HubSpot, Mailchimp, Zapier, n8n, Marketo, Oracle Eloqua, Constant Contact and AWeber. No phone or desktop app. |
| Best for | an email validation API with flat monthly plans | keeping a CRM's contacts checked automatically |
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 NeverBounce. How we grade
Where they differ
At a glance
| Mails.so | NeverBounce | |
|---|---|---|
| Pricing | Free trial | Free trial |
| Starts at | €48 per month for 10,000 validations, shown in euros | $8 one-time for 1,000 credits |
| Free plan | None | None |
| Free trial | 50 free credits on sign-up, no credit card required | Free test credits and a free list analysis, no credit card required |
| Web | ||
| Made by | Mails, Inc. | ZoomInfo Technologies LLC |
| Price read from | mails.so | neverbounce.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.
NeverBounce
- Pay-as-you-go credits expire 12 months after purchase.
- NeverBounce only verifies addresses; it has no warm-up, inbox placement or DMARC tools.
- Automatic syncing and AI scoring need the $49 a month Growth plan.
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.
NeverBounce
- Bulk list cleaning
- Upload a list for results in one go; pay-as-you-go accounts can clean up to 10 lists at once, and Growth any number in parallel.
- Real-time verification API
- Checks addresses as they arrive from sign-up forms or apps, and fixes common typos such as gmai for gmail.
- Sync
- Connects to a CRM or email platform and keeps its contacts verified automatically, charging only for new, unique addresses.
- Company data
- Returns the company name behind each business address, and Growth adds AI scoring of how likely a contact is to convert.
- GTM Guard
- Checks contacts before they reach AI agents and automated workflows, with n8n workflow blueprints for building them.
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.
NeverBounce
Pay as you go$8
one-time for 1,000 credits
Credits last 12 months. Bulk rates in the page's volume menu: $50 for 10,000, $400 for 100,000 and $2,500 for 1 million.
Growth$49
per month for up to 10,000 emails
Automatic CRM sync charged only for new unique emails, AI scoring and 200 AI-picked leads a month. $159 a month at 100,000 emails in the page's menu.
EnterpriseCustom
Typically 250,000+ emails a month, with unlimited use across teams, advanced security and compliance, and an account manager.
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.
NeverBounce
- Nonprofit
Nonprofit discounts on request
NeverBounce's pricing FAQ says nonprofits can get discounted verification by applying through its nonprofit pricing page.
Common questions
Which is cheaper, Mails.so or NeverBounce?
As of Nov 13, 2026, Mails.so starts at €48 per month for 10,000 validations, shown in euros, and NeverBounce starts at $8 one-time for 1,000 credits.
Which has a free plan, Mails.so or NeverBounce?
As of Nov 13, 2026, neither Mails.so nor NeverBounce 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.