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
Popular
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
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.