Every other deliverability tool charges somewhere between $29 and $150 per month. We run the same category of product, with broader provider coverage and a bigger seed network, and we charge nothing. This post explains why, and what “free forever” actually includes.
- Unlimited placement tests, every provider we support.
- 4,000+ real seed mailboxes across 30+ providers.
- Authentication audit (SPF, DKIM, DMARC, BIMI) included with every test.
- API access, with OAuth for Zapier/Make/n8n.
- MCP server for agent workflows.
- Presend text analysis.
- Domain monitoring.
- Post-send tracking with spam-move alerts.
Why free?
Inbox placement is a public-interest problem. Senders can't currently see what real mailboxes do with their mail. That asymmetry has created a whole market of expensive tools, and worse, an ecosystem of warmup vendors whose pricing depends on hiding real numbers. We'd rather not be another player in that market. We'd rather just tell you the number.
Commercially, free-forever gets used more. More usage means more seed data, better provider coverage, better anomaly detection. The free tier is the product.
No signup for the basic test
Paste your cold template, pick providers, run the test. Results in 30–120 seconds. You can sign up if you want history, alerts, and the API — that's also free.
Is anything paid?
We offer a paid plan for teams that want priority queuing, retention of historical tests beyond 90 days, and SLAs. The paid tier is optional — nothing about the free tier is a trial.
Try Inbox Check. Free, no signup, unlimited.