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Postbox Postbox

Start free. Scale when you're ready.

No credit card required. No submission limits on Pro. Pay only for the AI features you use.

Free

$0

Free forever

  • 1 form
  • 5,000 lifetime submissions
  • 50 AI credits (one-time)
  • Standard spam protection
  • Email notifications
  • API access
Get Started
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Pro

$19 /mo

$199/yr — save 13%

  • Unlimited forms
  • Unlimited submissions
  • MCP server access
  • Priority support
  • 500 AI credits/month (replenishing)
  • Metered billing after 500
  • Schema versioning
  • Webhook integrations
Start Free Trial

AI credit pricing

Spam detection

$0.005

per submission

Translation

$0.005

per submission

Smart reply

$0.01

per reply

Standard spam protection (heuristics, honeypot, content moderation) is always free and doesn't use credits.

Pricing questions

What happens when I hit my submission limit on Free?
Your form stops accepting submissions. Upgrade to Pro for unlimited submissions, or create a new account for another 5,000.
Do AI credits roll over?
Free credits are one-time and don't expire. Pro credits replenish monthly (500/month) and don't roll over. After 500, you pay the metered rate.
Can I use Postbox without AI features?
Yes. Standard spam protection, validation, email notifications, and the full API work without any AI credits. AI features (intelligent spam detection, auto-translation, smart replies) are optional.