GlockApps vs Mail-Tester
Ongoing inbox placement and DMARC analytics versus quick single-message preflight tests.
What matters for SaaS product teams
A SaaS product sends on behalf of its customers, so the deciding factors are tenant isolation, whether suppressions can be scoped rather than global, and whether support can answer why one specific account did not receive one specific email. Lifecycle automation and transactional sending usually need to coexist.
| Priority | GlockApps | Mail-Tester |
|---|---|---|
| Multi-tenant | Yes | No |
| Event stream | Yes | No |
| Suppressions API | No | No |
| Operating since | Not published | Not published |
| Scheduling | No | No |
| Best published rate per 1,000 | Tiers not published in comparable form | Tiers not published in comparable form |
| 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. |
| Webhooks | No | No |
| Starts at | $59/mo billed annually for Essential | $50 for 500 tests, or larger prepaid test packs |
For a multi-tenant SaaS product running trial expiry notices, dunning, onboarding sequences, and per-tenant transactional mail, GlockApps takes every priority that separates them here (multi-tenant support and event stream), while Mail-Tester matches it on the rest. On entry price, GlockApps offers $59/mo billed annually for Essential against $50 for 500 tests, or larger prepaid test packs from Mail-Tester. That ordering reflects this audience. Weigh the same table differently and the answer changes.
Side by side
| Feature | GlockApps | Mail-Tester |
|---|---|---|
| Multi-tenant | 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. |
| Webhooks | No | No |
| 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. |
| 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 |
| Pricing model | tiered | pay-as-you-go |
| API | Yes | Yes |
| SMTP | No | No |
| SDKs | None | None |
| Templates | none | none |
| React Email | 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