Email on Acid vs GlockApps (2026): which should you pick?
As of Nov 13, 2026, we pick GlockApps: it is third in our ranking of email verification and deliverability tools, and it grades higher too, 2.2 against 1.8.
Checked Oct 18, 2026 and Nov 13, 2026 · graded Oct 18, 2026 and Nov 13, 2026 by ToolGPA
Email on Acid grades higher on platforms. GlockApps 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
GlockApps
Inbox placement testing with DMARC analytics and uptime monitoring
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 GlockApps if
- Fits if you want to see where a campaign lands before it goes out
- Works for agencies reporting on client domains with branded PDFs, or for several small domains on free DMARC
Look elsewhere if
- Pricey if you pay monthly, as Essential is $85 against $59 billed yearly
- Skip it if you need list cleaning or warm-up, as it tests and monitors only
- Tight if a team shares it, as Essential is for one user and 5 users start at Growth, $99 a month billed yearly
- Watch out: credit packs expire, with 3 tests for $16.99 valid for one month
- Not for you if you want integrations, as Google Postmaster Tools is the only one listed
How we grade them
| 1.8GPAEmail on AcidWeak | 2.2GPAGlockAppsFair | |
|---|---|---|
| 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. | CEssential is $59 a month billed yearly ($85 monthly) for 30 spam tests and 50,000 DMARC messages a month. For DMARC alone that's above its listed rivals dmarcian ($19.99) and EasyDMARC ($35.99), but neither runs placement tests on its priced plans. |
| Free plan and trial | DA free trial is offered, but the page states no length. | BA free plan with no card: 10,000 DMARC messages a month for unlimited domains, 5 uptime monitors, 1 IP reputation monitor and 2 spam tests. A small domain can live on the DMARC side; 2 tests won't go far. |
| Features | CPreviews, accessibility, link and image checks and spam analysis. It does not send email. | CPlacement tests report inbox, spam or tab by provider, with SpamAssassin scores, authentication checks and 50+ blocklists, and DMARC reports for unlimited domains. But it doesn't clean lists or warm up inboxes; it tests and monitors only. |
| 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 App Store rating on record. A test means sending your email to its seed list, but DMARC needs a DNS record first, and the reports take some know-how to act on. |
| Platforms and integrations | BWeb, with an API and unlimited users on every plan and one listed integration. | CWeb only, with Google Postmaster Tools as the one connection listed, plus an API and white-label reports. No phone or desktop app. |
| Best for | previewing an email in many clients before a send | seeing where a campaign lands before it goes |
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 GlockApps. 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. GlockApps starts at $59 a month and scores 2.0.
Email on Acid scores higher, and starts $40 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 20 score higher than GlockApps 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.
- GlockApps also covers dMARC.
At a glance
| Email on Acid | GlockApps | |
|---|---|---|
| Pricing | Free trial | Free plan |
| Starts at | $99 per month | $59 per month, billed annually ($85 monthly) |
| Free plan | None | 10,000 DMARC messages a month for unlimited domains, 5 uptime monitors, 1 IP reputation monitor and 2 free spam tests, no card required. |
| Free trial | Free trial offered; its length is not stated on the page | None listed |
| Web | ||
| Made by | Email on Acid | Deluxe Custom Apps LLC |
| Price read from | emailonacid.com | glockapps.com |
| Checked | Nov 13, 2026 | Oct 18, 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.
GlockApps
- Annual plans list yearly allowances (Essential: 360 spam tests and 600,000 DMARC messages a year) rather than monthly ones.
- Annual billing saves about 30%, and monthly prices are much higher: Essential is $85 against $59.
- DMARC Analytics alone is sold from $55 a month for 1 million messages, billed monthly.
- GlockApps has no list verification or warm-up; it tests and monitors only.
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.
GlockApps
- Inbox Insight
- Seed-list tests show inbox, spam or tab placement by provider, with SpamAssassin scores, authentication checks and a scan of 50+ blocklists.
- DMARC Analyzer
- Collects DMARC reports for unlimited domains with daily reports, a digest and alerts on suspicious activity; overage costs $2 to $7.50 per 100,000 messages.
- Uptime and IP reputation monitors
- Watches websites, mail servers and sending IPs, and checks SPF, DKIM and DMARC records every two hours.
- Google Postmaster integration
- Brings Google Postmaster Tools data into the dashboard next to test results.
- API and white-label reports
- An API for automated testing, projects and folders for managing clients, and branded PDF reports.
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.
GlockApps
Free$0
2 spam tests, 10,000 DMARC messages a month, 5 uptime monitors and 1 user.
Credits Pack 1$16.99
one-time for 3 spam tests
Credits valid for 1 month. Pack 2 is $47.99 for 10 tests valid 2 months, and Pack 3 $75.99 for 20 valid 3 months.
Essential$59
per month, billed annually ($85 monthly)
30 spam tests and 50,000 DMARC messages a month, 15 uptime monitors, 10 IP reputation monitors and 3 DMARKOFF domains, for one user.
Growth$99
per month, billed annually ($142 monthly)
90 spam tests and 100,000 DMARC messages a month, 25 uptime monitors, 20 IP reputation monitors and 5 users.
Enterprise$129
per month, billed annually ($185 monthly)
For agencies: 150 spam tests and 1 million DMARC messages a month, 30 uptime monitors and 10 users.
CustomCustom
A plan built to order for large senders.
Ways to pay less
Email on Acid
No public discounts listed.
GlockApps
- Annual discount
Save 30% with annual billing
GlockApps lists a 30% saving on annual plans: Essential is $59 a month paid annually ($708) against $85 billed monthly.
Common questions
Which is cheaper, Email on Acid or GlockApps?
As of Nov 13, 2026, GlockApps is cheaper to start with: $59 a month, against $99 a month for Email on Acid. Email on Acid starts at $99 per month, and GlockApps starts at $59 per month, billed annually ($85 monthly).
Which has a free plan, Email on Acid or GlockApps?
As of Nov 13, 2026, only GlockApps 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.