kitio.aiContext7 vs Sendmux
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 $10 for Context7.
At a glance
Best for
Pricing model
Starting price
Free plan
Made by
Based in
Rating
Key features
- Version-aware docs
- MCP server
- Docs API
- Thousands of libraries
- Private docs on Pro
- Agent mailboxes
- Send and receive API
- Calendar and file storage
- Hosted MCP server
- Provider failover
- SDKs and CLI
| Feature | Context7 | Sendmux |
|---|---|---|
| Best for | Up-to-date library docs for AI coding agents via MCP | Email, calendar and file API that gives AI agents real inboxes |
| Category | Coding | Coding |
| Pricing model | Freemium | Freemium |
| Starting price | $10/mo | $7/mo |
| Free plan | Yes | Yes |
| Made by | Upstash | Sendmux |
| Based in | United States | – |
| 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 $10 for Context7.
Free plan
Cheapest paid plan
Top plan
Free trial
3 plans
Free
Free
- 1,000 API calls per month
- Public repos
Pro
$10/mo
- Per seat
- 2,000 API calls per seat
- Private repos, team collaboration
- Extra calls $5 / 1,000
Enterprise
Custom
- Custom usage
- Self-hosted option
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 Oct 28, 2026 or later. Plans change often, so confirm on each tool's site before you buy.
Pros and cons
Context7
- Reduces hallucinated APIs
- Easy MCP setup
- Cheap Pro plan
- Free monthly cap
- Coverage varies by library
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 Context7 if you want:
- Reduces hallucinated APIs
- Easy MCP setup
- Cheap Pro plan
Watch out: free monthly cap.
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.
Context7 vs Sendmux FAQ
What is the difference between Context7 and Sendmux?
Context7: Up-to-date library docs for AI coding agents via MCP. Sendmux: Email, calendar and file API that gives AI agents real inboxes. Both are coding tools.
Is Context7 or Sendmux cheaper?
Sendmux has the lower starting price: about $7 a month, against $10 for Context7.
Do Context7 and Sendmux have free plans?
Context7: Yes. Sendmux: Yes.
Who makes Context7?
Context7 is made by Upstash, based in United States.
Who makes Sendmux?
Sendmux is made by Sendmux.
Which should I choose, Context7 or Sendmux?
Choose Context7 if you value reduces hallucinated apis and easy mcp setup. Choose Sendmux if you value built specifically for ai agents and no per-mailbox fees.