kitio.aiContext7 vs Mails.ai
A side-by-side look at pricing plans, free tiers, features, pros and cons, updated for 2026. Context7 has the lower starting price: about $10 a month, against $20 for Mails.ai.
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
- Inbox per agent through one API call
- TypeScript and Python SDKs
- MCP server
- Injection scan on inbound mail
- Send from your own domain
| Feature | Context7 | Mails.ai |
|---|---|---|
| Best for | Up-to-date library docs for AI coding agents via MCP | Email API that gives AI agents their own inboxes |
| Category | Coding | Coding |
| Pricing model | Freemium | Freemium |
| Starting price | $10/mo | $20/mo |
| Free plan | Yes | Yes |
| Made by | Upstash | Mails.ai |
| Based in | United States | – |
| Rating | No ratings yet | No ratings yet |
| Key features |
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Both offer: MCP server.
Pricing compared
Context7 has the lower starting price: about $10 a month, against $20 for Mails.ai.
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
- 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 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
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 Context7 if you want:
- Reduces hallucinated APIs
- Easy MCP setup
- Cheap Pro plan
Watch out: free monthly cap.
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.
Context7 vs Mails.ai FAQ
What is the difference between Context7 and Mails.ai?
Context7: Up-to-date library docs for AI coding agents via MCP. Mails.ai: Email API that gives AI agents their own inboxes. Both are coding tools.
Is Context7 or Mails.ai cheaper?
Context7 has the lower starting price: about $10 a month, against $20 for Mails.ai.
Do Context7 and Mails.ai have free plans?
Context7: Yes. Mails.ai: Yes.
Who makes Context7?
Context7 is made by Upstash, based in United States.
Who makes Mails.ai?
Mails.ai is made by Mails.ai.
Which should I choose, Context7 or Mails.ai?
Choose Context7 if you value reduces hallucinated apis and easy mcp setup. Choose Mails.ai if you value free tier with no card and controls on who an agent can email.