Pricing

Pay only for what you use. No accounts, no lock-in, no hidden fees.

All tiers include the same core tool. Higher tiers increase rate limits and probe timeout for heavier use.

Free
$0
per month
Ad-hoc diagnostics for individual use.
  • ✔ Single-probe SMTP diagnostics
  • ✔ Ports 25, 465, and 587
  • ✔ STARTTLS detection
  • ✔ AUTH mechanism listing
  • ✔ EHLO response display
  • ✔ 1 probe per 60 seconds
  • ✔ 15-second probe timeout
Use free
Pro Planned
$12
per month
Heavier usage with longer probes and priority processing.
  • ✔ Everything in Free
  • ✔ 30 probes per minute
  • ✔ 60-second probe timeout
  • ◆ JSON API access (planned)
  • ◆ Bulk probe endpoint (planned)
No accounts, no stored data. smtplens is stateless by design. Every probe is independent — no history, no preferences, no login required. Pro tier does not collect or store personal information; rate limiting is enforced per visitor session.

Demo checkout

This is a demonstration checkout form. No real payment is taken. The Pro tier is not yet available for purchase.

Demo — no real payment

This is a demo form. No data is sent and no subscription is created.

✔

Subscription activated (demo)

This was a demonstration. The Pro tier subscription is not yet available.
Check back later for launch updates.