Email on Acid vs MailGenius (2026): which should you pick?
As of Nov 13, 2026, MailGenius grades higher than Email on Acid: 2.0 against 1.8 out of 4.0.
Checked Nov 13, 2026 · graded Nov 13, 2026 by ToolGPA
Email on Acid grades higher on platforms. MailGenius grades higher on value for money and the free plan. They get the same grade on features and ease of use.
Price, platforms and features side by side. The table says where each price was read and when.
Email on Acid
Email previews and pre-send QA, now moving to Mailgun Inspect
MailGenius
Email spam-score and deliverability tester with DNS checkers
Which one is for you
Pick Email on Acid if
- Fits if you check each campaign across many email clients
- Works for agencies that need unlimited users on one account
Look elsewhere if
- Pricey if you add it up, at $99 a month for 1,000 previews
- Skip it if you want accessibility or spam checks on the cheap plan, as they start at Premium, $199
- Watch out: the pricing page says customers move to Mailgun Inspect from June 2026 and old tests are not carried over
- Watch out: it does not send email, so you need a separate sending service
- Watch out: the trial length is not stated
Pick MailGenius if
- Fits if you send marketing email and want a check before each campaign
- Works for people who only need the free DNS checkers
Look elsewhere if
- Tight if you test often, as Beginner stops at 60 tests a month
- Pricey if you pay monthly, about 25% over the yearly price
- Watch out: results are hosted on public links, according to the notice under the free test
- Watch out: testing competitors' emails needs Genius, $39 a month
- Watch out: automatic testing of every send needs the $79 plan
How we grade them
| 1.8GPAEmail on AcidWeak | 2.0GPAMailGeniusFair | |
|---|---|---|
| Value for money | DBasic is $99 a month for 1,000 previews, above the category's dearer quarter ($49). The checks most people want sit on Premium at $199. | CBeginner is $23 a month billed yearly for 60 tests, which is the category's middle figure. |
| Free plan and trial | DA free trial is offered, but the page states no length. | CA free spam test is offered on the home page, but its monthly limit is not stated. |
| Features | CPreviews, accessibility, link and image checks and spam analysis. It does not send email. | CSpam test, inbox placement, AI copy suggestions, DNS checkers and, on the top plan, automatic testing and blacklist monitoring. |
| Ease of use | CNo rating on record. Paste or send the email and read the results, with a migration to Mailgun Inspect under way. | CNo rating on record. Send an email to a test address and read the report. |
| Platforms and integrations | BWeb, with an API and unlimited users on every plan and one listed integration. | CWeb only, with no integrations listed on the vendor pages. |
| Best for | previewing an email in many clients before a send | checking an email for spam signals before sending |
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: Email on Acid and MailGenius. How we grade
Price against what you get
Email on Acid starts at $99 a month and scores 2.3 out of 4 on features, ease of use and platforms. MailGenius starts at $23 a month and scores 2.0.
Email on Acid scores higher, and starts $76 a month higher: the question is whether the extra is worth that to you. Of the other email verification and deliverability tools on the chart, 8 score higher than Email on Acid for less, and 13 score higher than MailGenius 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
- Email on Acid also covers reports and email campaigns.
- MailGenius also covers dMARC.
At a glance
| Email on Acid | MailGenius | |
|---|---|---|
| Pricing | Free trial | Free plan |
| Starts at | $99 per month | $23 per month for 60 email tests, billed yearly ($29 billed monthly) |
| Free plan | None | A free spam test is offered on the homepage; its monthly limit is not stated. |
| Free trial | Free trial offered; its length is not stated on the page | None listed |
| Web | ||
| Made by | Email on Acid | MailGenius |
| Price read from | emailonacid.com | mailgenius.com |
| Checked | Nov 13, 2026 | Nov 13, 2026 |
Worth knowing
Email on Acid
- The pricing page says current customers will move to Mailgun Inspect from June 2026, and that old previews and tests are not carried over.
- Annual-plan customers migrate at the end of their current term.
- Basic has no accessibility, spam or link checks; those start at Premium.
- It does not send email; the FAQ says you need a separate sending service.
MailGenius
- Test results are hosted on public links, according to the notice under the free test.
- The competitor and prospect email testing is limited to the Genius plan and above.
- The pricing page shows the prices for yearly billing by default; monthly billing costs about 25% more.
- The Beginner plan caps tests at 60 a month.
Key features
Email on Acid
- Client and device previews
- Each screenshot of a client or device counts as one preview, so a test across 50 clients uses 50 previews.
- Accessibility checks
- Premium tests are based on the W3C Web Content Accessibility Guidelines, which the vendor ties to the European Accessibility Act.
- Link and image validation
- Premium checks links and images in a message. The FAQ says these checks, unlike previews, are unlimited.
- Spam content analysis
- Premium includes content spam checks and HTML code analysis, judged on the message itself and not on your sending reputation.
- API access and unlimited users
- Every plan includes API access, and none of the plans limit how many people on a team can use the account.
MailGenius
- Spam test by email
- Send a message to a generated address and get a score covering SPF, DKIM, DMARC, reverse DNS, domain age, blacklists, broken and short links, and HTML structure.
- Inbox placement results
- Paid test results include inbox placement, which the vendor says simulates Gmail, Outlook and Yahoo.
- AI deliverability and copywriting help
- Every paid plan includes an AI deliverability consultant and AI analysis and rewriting of email copy.
- Automatic testing and blacklist monitoring
- The top plan tests every email you send and watches unlimited domains for blacklist listings, with alerts.
- Free DNS checkers
- The site links separate checkers for SPF, DKIM, DMARC, BIMI, MX, TXT, blacklists and a DNS audit.
Plans
Email on Acid
Basic$99
per month for 1,000 previews
Unlimited users, 100+ preview clients and devices, API access; extra previews cost $0.15 each.
Premium$199
per month for 2,000 previews
Adds accessibility tests, HTML code analysis, link and image validation and spam content checks.
ContractCustom
Custom preview allotment with the Premium feature set and phone and chat support; sold through sales.
MailGenius
Beginner$23
per month for 60 email tests, billed yearly ($29 billed monthly)
60 tests a month, with inbox placement, an AI deliverability consultant and AI copywriting analysis and rewrite.
Genius$39
per month, billed yearly ($49 billed monthly)
Unlimited tests, plus the ability to test competitors' or prospects' emails.
Automatic Testing & Monitoring$79
per month, billed yearly ($97 billed monthly)
Every email you send is tested automatically, with blacklist monitoring and alerts for unlimited domains.
Ways to pay less
Email on Acid
No public discounts listed.
MailGenius
- Annual discount
Save 20% with yearly billing
The pricing page toggle shows 'Save 20%' for yearly billing, for example $79 a month instead of $97 on the top plan.
Common questions
Which is cheaper, Email on Acid or MailGenius?
As of Nov 13, 2026, MailGenius is cheaper to start with: $23 a month, against $99 a month for Email on Acid. Email on Acid starts at $99 per month, and MailGenius starts at $23 per month for 60 email tests, billed yearly ($29 billed monthly).
Which has a free plan, Email on Acid or MailGenius?
As of Nov 13, 2026, only MailGenius has a free plan. Email on Acid does not, though it has 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.