kitio.aiSentry vs Sendmux
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Sentry starts at See pricing page and Sendmux starts at $7/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
- Agent mailboxes
- Send and receive API
- Calendar and file storage
- Hosted MCP server
- Provider failover
- SDKs and CLI
| Feature | Sentry | Sendmux |
|---|---|---|
| Best for | Error and performance monitoring with an AI debugging agent | Email, calendar and file API that gives AI agents real inboxes |
| Category | Coding | Coding |
| Pricing model | Freemium | Freemium |
| Starting price | See pricing page | $7/mo |
| Free plan | Yes | Yes |
| Made by | Functional Software (Sentry) | Sendmux |
| 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 Sendmux starts at $7/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
- 2 mailboxes
- 1 domain
- $1 usage credit
Pro
$7/mo
- Per team, plus usage
- Unlimited mailboxes and domains
- Credit top-ups
Enterprise
Custom
- Postpaid usage
- Dedicated infrastructure
- Custom SLAs
Prices in USD, checked Nov 5, 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
Sendmux
- Built specifically for AI agents
- No per-mailbox fees
- Works with your own email providers
- Free plan adds a Sendmux footer
- Free managed sending is very limited
- Usage costs on top of the Pro fee
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 Sendmux if you want:
- Built specifically for AI agents
- No per-mailbox fees
- Works with your own email providers
Watch out: free plan adds a sendmux footer.
Sentry vs Sendmux FAQ
What is the difference between Sentry and Sendmux?
Sentry: Error and performance monitoring with an AI debugging agent. Sendmux: Email, calendar and file API that gives AI agents real inboxes. Both are coding tools.
Is Sentry or Sendmux cheaper?
Sentry starts at See pricing page and Sendmux starts at $7/mo. Check both pricing pages for current plans.
Do Sentry and Sendmux have free plans?
Sentry: Yes. Sendmux: Yes.
Who makes Sentry?
Sentry is made by Functional Software (Sentry), based in United States.
Who makes Sendmux?
Sendmux is made by Sendmux.
Which should I choose, Sentry or Sendmux?
Choose Sentry if you value free plan for solo developers and ai debugging works from real error data. Choose Sendmux if you value built specifically for ai agents and no per-mailbox fees.