kitio.aiSendmux vs Shiplight AI
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Sendmux has the lower starting price: about $7 a month, against $60 for Shiplight AI.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Agent mailboxes
- Send and receive API
- Calendar and file storage
- Hosted MCP server
- Provider failover
- SDKs and CLI
- Agent-authored E2E tests
- Browser MCP server
- Self-healing tests
- YAML tests in your repo
- Hosted CI runners
| Feature | Sendmux | Shiplight AI |
|---|---|---|
| Best for | Email, calendar and file API that gives AI agents real inboxes | End-to-end tests written and maintained by your coding agent |
| Category | Coding | Coding |
| Pricing model | Freemium | Freemium |
| Starting price | $7/mo | $60/mo |
| Free plan | Yes | Yes |
| Made by | Sendmux | Shiplight AI |
| Based in | – | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Pricing compared
Sendmux has the lower starting price: about $7 a month, against $60 for Shiplight AI.
Free plan
Cheapest paid plan
Top plan
Free trial
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
3 plans
Free
Free
- $10 signup credit
- Up to 5 members
- 30-day artifact retention
Pro
$60/mo
- $60 monthly credit
- Pay as you go beyond credit
- Up to 25 members
- 90-day retention
Enterprise
Contact sales
- Volume pricing
- SSO and SOC 2
- Dedicated CSM
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
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
Shiplight AI
- Works with Claude Code, Cursor and Codex
- Readable tests reviewed in PRs
- All features on the free plan
- Usage beyond credit is metered
- Free plan keeps artifacts only 30 days
- Best suited to teams already using coding agents
Which one should you choose?
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.
Choose Shiplight AI if you want:
- Works with Claude Code, Cursor and Codex
- Readable tests reviewed in PRs
- All features on the free plan
Watch out: usage beyond credit is metered.
Sendmux vs Shiplight AI FAQ
What is the difference between Sendmux and Shiplight AI?
Sendmux: Email, calendar and file API that gives AI agents real inboxes. Shiplight AI: End-to-end tests written and maintained by your coding agent. Both are coding tools.
Is Sendmux or Shiplight AI cheaper?
Sendmux has the lower starting price: about $7 a month, against $60 for Shiplight AI.
Do Sendmux and Shiplight AI have free plans?
Sendmux: Yes. Shiplight AI: Yes.
Who makes Sendmux?
Sendmux is made by Sendmux.
Who makes Shiplight AI?
Shiplight AI is made by Shiplight AI.
Which should I choose, Sendmux or Shiplight AI?
Choose Sendmux if you value built specifically for ai agents and no per-mailbox fees. Choose Shiplight AI if you value works with claude code, cursor and codex and readable tests reviewed in prs.