kitio.aiSentry vs Mails.ai
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Sentry starts at See pricing page and Mails.ai starts at $20/mo. Check both pricing pages for current plans.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Error monitoring
- Tracing and profiling
- Session replay
- Seer AI debugging agent
- AI code review
- Sentry MCP server
- Inbox per agent through one API call
- TypeScript and Python SDKs
- MCP server
- Injection scan on inbound mail
- Send from your own domain
| Feature | Sentry | Mails.ai |
|---|---|---|
| Best for | Error and performance monitoring with an AI debugging agent | Email API that gives AI agents their own inboxes |
| Category | Coding | Coding |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | $20/mo |
| Free plan | Yes | Yes |
| Made by | Functional Software (Sentry) | Mails.ai |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Sentry starts at See pricing page and Mails.ai starts at $20/mo. Check both pricing pages for current plans.
Free plan
Cheapest paid plan
Top plan
Free trial
4 plans
Developer
Free
- Limited to one user
- Error monitoring and tracing
- 10 custom dashboards
- MCP access
Team
$26/mo billed yearly
- Unlimited users
- Third-party integrations
- 20 custom dashboards
- Seer available as add-on
Business
$80/mo billed yearly
- Unlimited custom dashboards
- Advanced quota management
- SAML and SCIM support
Enterprise
Contact sales
- Technical account manager
- Dedicated support
3 plans
Free
Free
- 3,000 emails per month
- 3,000 inbound replies per month
- 1 agent
Pro
$20/mo
- 50K emails per month
- 5 agents
- Send from your own domain
- Signed webhooks
Scale
$99/mo
- 250K emails per month
- Unlimited agents
- Per-agent allowlists and send limits
Prices in USD, checked Oct 29, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Sentry
- Free plan for solo developers
- AI debugging works from real error data
- Wide SDK coverage
- Integrates with GitHub and Slack
- Seer needs a separate subscription
- Free plan is limited to one user
- Costs rise with event volume
Mails.ai
- Free tier with no card
- Controls on who an agent can email
- Works with major coding agents
- Free plan allows just 1 agent
- Custom domains need Pro
- Dedicated IP is on request only
Which one should you choose?
Choose Sentry if you want:
- Free plan for solo developers
- AI debugging works from real error data
- Wide SDK coverage
Watch out: seer needs a separate subscription.
Choose Mails.ai if you want:
- Free tier with no card
- Controls on who an agent can email
- Works with major coding agents
Watch out: free plan allows just 1 agent.
Sentry vs Mails.ai FAQ
What is the difference between Sentry and Mails.ai?
Sentry: Error and performance monitoring with an AI debugging agent. Mails.ai: Email API that gives AI agents their own inboxes. Both are coding tools.
Is Sentry or Mails.ai cheaper?
Sentry starts at See pricing page and Mails.ai starts at $20/mo. Check both pricing pages for current plans.
Do Sentry and Mails.ai have free plans?
Sentry: Yes. Mails.ai: Yes.
Who makes Sentry?
Sentry is made by Functional Software (Sentry), based in United States.
Who makes Mails.ai?
Mails.ai is made by Mails.ai.
Which should I choose, Sentry or Mails.ai?
Choose Sentry if you value free plan for solo developers and ai debugging works from real error data. Choose Mails.ai if you value free tier with no card and controls on who an agent can email.