GlockApps vs Mail-Tester
Ongoing inbox placement and DMARC analytics versus quick single-message preflight tests.
What matters for growth and lifecycle teams
Growth work lives or dies on targeting and measurement. What matters is whether behavioral triggers can be built without engineering time, whether the event stream supports attribution past the open, and whether deliverability holds when broadcast volume shares a reputation with product email.
| Priority | GlockApps | Mail-Tester |
|---|---|---|
| Scheduling | No | No |
| Event stream | Yes | No |
| Deliverability | Not a sender. Measures inbox placement and DMARC alignment so teams can diagnose deliverability problems before blaming the ESP. | Not a sender. Scores one message at a time and helps identify obvious authentication, blacklist, and SpamAssassin issues. |
| Operating since | Not published | Not published |
| Suppressions API | No | No |
| Best published rate per 1,000 | Tiers not published in comparable form | Tiers not published in comparable form |
| Multi-tenant | Yes | No |
| Free tier | Free plan with 2 Inbox Insight tests once and 10,000 DMARC messages/mo | 3 tests free within the last 24 hours via the web interface |
| Starts at | $59/mo billed annually for Essential | $50 for 500 tests, or larger prepaid test packs |
For lifecycle and activation work running behavior-triggered journeys, broadcasts, and winback campaigns measured on revenue, GlockApps takes every priority that separates them here (event stream and multi-tenant support), while Mail-Tester matches it on the rest. On free tier, GlockApps offers Free plan with 2 Inbox Insight tests once and 10,000 DMARC messages/mo against 3 tests free within the last 24 hours via the web interface from Mail-Tester. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | GlockApps | Mail-Tester |
|---|---|---|
| Deliverability | Not a sender. Measures inbox placement and DMARC alignment so teams can diagnose deliverability problems before blaming the ESP. | Not a sender. Scores one message at a time and helps identify obvious authentication, blacklist, and SpamAssassin issues. |
| Multi-tenant | Yes | No |
| Free tier | Free plan with 2 Inbox Insight tests once and 10,000 DMARC messages/mo | 3 tests free within the last 24 hours via the web interface |
| Starts at | $59/mo billed annually for Essential | $50 for 500 tests, or larger prepaid test packs |
| Tagline | Inbox placement testing plus DMARC analytics. | Simple send-to-test-address spam score checks. |
| Pricing model | tiered | pay-as-you-go |
| API | Yes | Yes |
| SMTP | No | No |
| SDKs | None | None |
| Templates | none | none |
| React Email | No | No |
| Webhooks | No | No |
| Inbound | No | No |
| Idempotency | No | No |
| Dedicated IP | No | No |
| DX score | 7/10 | 8/10 |
| Best for | Growth and marketing teams that regularly test inbox placement across Gmail, Outlook, and other mailbox providers. | Developers and marketers who need a quick preflight check for a specific message. |
GlockApps
- ›Combines spam testing with DMARC analytics
- ›Free plan includes enough to run a first diagnostic
- ›Credit packs are available for teams that do not want a subscription
- ›Subscription pricing is higher than simple DMARC monitors
- ›Inbox tests are only a sample, not a guarantee of every recipient inbox
- ›Annual billing is needed for the lowest published monthly price
Mail-Tester
- ›Very fast manual diagnostic
- ›Free tests cover occasional checks
- ›Paid API and iframe options exist for product integrations
- ›Prepaid test packs do not expire
- ›No ongoing monitoring unless integrated manually
- ›One test does not represent every mailbox provider
- ›Interface is intentionally simple rather than polished