Pricing
SMTP probing should be free. The core tool is — no accounts, no trials, no limits.
Free
$0 forever
Everything you need for a single probe.
- ✓ SMTP probes on ports 25, 465, 587
- ✓ Greeting banner, STARTTLS, auth detection
- ✓ Handshake latency measurement
- ✓ 15-second probe timeout
- ✓ Local probe history (in-browser)
- — API access Planned
- — Batch probes Planned
- — Custom SMTP commands Planned
Pro
$9 /month
For teams and automated workflows. In development.
- ✓ Everything in Free
- ✓ API key access — probe from scripts In dev
- ✓ Batch hostname checking In dev
- ✓ Extended 60-second timeout In dev
- ✓ Custom EHLO hostname In dev
- ✓ Export results (JSON / CSV) In dev
- ✓ Dedicated probe endpoint In dev
Frequently asked questions
Is there a catch with the Free plan?
No. The tool is genuinely free. There are no accounts, no rate limits, no trials that expire. Enter a hostname, click Check, see the result.
What does the Pro plan include that Free doesn't?
Pro adds API access (probe a server from a script or CI pipeline), batch hostname checking, extended timeouts for slow servers, custom EHLO hostnames, and structured result exports. All Pro features are in active development and not yet available for purchase.
When will Pro be available?
We are actively building the Pro tier. Join the waitlist by clicking the Subscribe button below to be notified when it launches.
Do you store my probes or data?
No. Each probe is stateless. The Free tool stores nothing server-side. Recent probes are saved in your browser's localStorage so you can re-run them — that data never leaves your machine.
Do I need an account?
No. The Free tool requires no account, no login, no signup. Just type a hostname and probe.