GlockApps vs Inbox Monster (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 1.4.
Checked Oct 18, 2026 and Nov 13, 2026 · graded Oct 18, 2026 and Nov 13, 2026 by ToolGPA
GlockApps grades higher on value for money and the free plan. They get the same grade on features, ease of use and platforms.
Price, platforms and features side by side. The table says where each price was read and when.
GlockApps
Inbox placement testing with DMARC analytics and uptime monitoring
Inbox Monster
Email rendering previews and inbox placement testing
Which one is for you
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
Pick Inbox Monster if
- Fits if a design team checks every campaign on many devices and clients
- Works for enterprises that already budget for yearly software contracts
Look elsewhere if
- Skip it if you want to pay monthly, as every price is a yearly figure
- Pricey if you are one person, with the cheapest suite at $3,750 a year
- Too light for placement testing on the creative plans, which need the $15,000 deliverability suite
- Watch out: live device previews, translation and single sign-on need the Enterprise creative tier
- Watch out: there is no free plan or trial listed
How we grade them
| 2.2GPAGlockAppsFair | 1.4GPAInbox MonsterWeak | |
|---|---|---|
| Value for money | 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. | DCreative Essential starts at $3,750 a year, about $312 a month, against a dearest tenth that starts at $129 a month. The deliverability suite is $15,000. |
| Free plan and trial | 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. | FNo free plan and no trial is listed on the pricing page. |
| Features | 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. | CPreviews on 120+ devices, QA checks, placement, DMARC monitoring and SMS testing, but each is its own suite with its own price. |
| Ease of use | 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. | CNo rating on record. Buying goes through sales, and rendering and placement tools need setup per account. |
| Platforms and integrations | CWeb only, with Google Postmaster Tools as the one connection listed, plus an API and white-label reports. No phone or desktop app. | CWeb only, with no integrations listed on the vendor pages. |
| Best for | seeing where a campaign lands before it goes | email design teams with a yearly budget |
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: GlockApps and Inbox Monster. How we grade
Price against what you get
GlockApps starts at $59 a month and scores 2.0 out of 4 on features, ease of use and platforms. Inbox Monster starts at $312.50 a month when paid by the year and scores 2.0.
They score the same, and GlockApps starts $253.50 a month lower. Of the other email verification and deliverability tools on the chart, 20 score higher than GlockApps for less, and 26 score higher than Inbox Monster 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
- Inbox Monster also covers reports and email campaigns.
At a glance
| GlockApps | Inbox Monster | |
|---|---|---|
| Pricing | Free plan | Paid |
| Starts at | $59 per month, billed annually ($85 monthly) | $3,750 per year and up (creative suite) |
| Free plan | 10,000 DMARC messages a month for unlimited domains, 5 uptime monitors, 1 IP reputation monitor and 2 free spam tests, no card required. | None |
| Free trial | None listed | None listed |
| Web | ||
| Made by | Deluxe Custom Apps LLC | Inbox Monster |
| Price read from | glockapps.com | inboxmonster.com |
| Checked | Oct 18, 2026 | Nov 13, 2026 |
Worth knowing
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.
Inbox Monster
- Every price is a yearly starting figure, from $3,750 a year; there is no monthly or self-serve checkout.
- Creative, deliverability and SMS are sold as separate suites, each priced on its own.
- Live device previews, translation and single sign-on need the Enterprise creative tier.
- The deliverability suite lists professional services packages as an optional extra.
Key features
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.
Inbox Monster
- Email client previews
- The creative suite renders emails in more than 120 modern clients and devices, including dark mode, with team proofing.
- QA diagnostics
- Checks cover links, accessibility and click-through terms, and the Enterprise tier adds translation and approval workflows.
- Inbox placement and reputation
- The deliverability suite reports weighted inbox placement, spam-trap tests, reputation analysis and blocklist monitoring.
- DMARC monitoring and alerts
- The deliverability suite includes DMARC monitoring, real-time alerts and shareable custom reports for the team.
- SMS delivery testing
- A separate suite shows where text messages land by carrier, with link diagnostics and journey testing.
Plans
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.
Inbox Monster
Creative Essential$3,750
per year and up, for 15,000 previews
120+ device renderings, QA and collaboration tools, AI summary previews, accessibility analysis and click map.
Creative Advanced$6,500
per year and up, for 30,000 previews
Same features as Essential with a higher preview allowance.
Creative Enterprise$10,000
per year and up, custom previews
Adds live device previews, translation, approvals, single sign-on, subaccounts and procurement support.
Deliverability suite$15,000
per year and up
Weighted inbox placement, reputation analysis, spam-trap testing, blocklist and DMARC monitoring, alerts and ESP integrations.
SMS suite$6,000
per year and up
Deliverability by carrier, virtualized previews, journey testing, link diagnostics and reputation checks.
Ways to pay less
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.
Inbox Monster
No public discounts listed.
Common questions
Which is cheaper, GlockApps or Inbox Monster?
As of Nov 13, 2026, GlockApps is cheaper to start with: $59 a month, against $312.50 a month when paid by the year for Inbox Monster. GlockApps starts at $59 per month, billed annually ($85 monthly), and Inbox Monster starts at $3,750 per year and up (creative suite).
Which has a free plan, GlockApps or Inbox Monster?
As of Nov 13, 2026, only GlockApps has a free plan. Inbox Monster does not.
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.