ACI.dev vs Composio: Which is Better in 2026?
Choosing between ACI.dev and Composio? Both are popular agent auth & tool calling tools. Below we compare them on pricing, free tiers, features, and pros & cons so you can pick the right fit for your stack.
Quick verdict
Both ACI.dev and Composio are strong agent auth & tool calling choices. The right pick comes down to your specific feature needs, existing stack, and team preferences. In our catalog, Composio rates slightly higher (4.6 vs 4.1 out of 5).
ACI.dev vs Composio — Side by Side
| ACI.dev | Composio | |
|---|---|---|
| Category | Agent Auth & Tool Calling | Agent Auth & Tool Calling |
| Pricing | Free · then usage-based | Free · paid from $29/mo |
| Starting price | Free tier available | Free tier available |
| Free tier | ||
| Rating | 4.1 | 4.6 |
| Best for | Agent Auth & Tool Calling — open-source, mcp | Agent Auth & Tool Calling — tool-calling, oauth |
Pros & Cons
- Apache-2.0: truly open source and self-hostable
- Multi-tenant OAuth for end users built in
- One MCP server for all tools
- No commits to the main repo since May 2026
- Smaller catalog than hosted rivals
- You run and secure the token store yourself
- Largest catalog: 1,500+ apps with managed OAuth
- Generous free tier (100K tool calls)
- SOC 2 Type II and ISO 27001
- Hosted only; no self-host option published
- Compliance add-ons (BAA, IP allowlist) are billed per call on Pro
- Pricing changed in Aug 2026, so older guides quote the wrong numbers
Key Features Compared
ACI.dev
- 600+ integrations
- Multi-tenant OAuth
- Unified MCP server
- Self-hosted
Composio
- $29 usage credit included
- $0.0003 per tool call
- $0.003 per trigger event
- Unlimited team members, spend controls
Choose ACI.dev if…
- You want a free tier to validate before paying.
- Apache-2.0: truly open source and self-hostable
- Multi-tenant OAuth for end users built in
- One MCP server for all tools
Choose Composio if…
- You want a free tier to validate before paying.
- Largest catalog: 1,500+ apps with managed OAuth
- Generous free tier (100K tool calls)
- SOC 2 Type II and ISO 27001
Frequently Asked Questions
Is ACI.dev better than Composio?⌄
Both ACI.dev and Composio are strong agent auth & tool calling choices. The right pick comes down to your specific feature needs, existing stack, and team preferences. In our catalog, Composio rates slightly higher (4.6 vs 4.1 out of 5).
What is the difference between ACI.dev and Composio?⌄
ACI.dev — Open-source (Apache-2.0) tool-calling platform: 600+ integrations, multi-tenant OAuth for end users, and a unified MCP server. Composio — Managed tool calling and OAuth for AI agents: 1,500+ app integrations, triggers and an MCP gateway, with a free tier of 100K tool calls a month. Both are agent auth & tool calling tools; the comparison table above breaks down pricing, free tiers, and what each is best for.
ACI.dev vs Composio: which is cheaper?⌄
ACI.dev pricing: Free · then usage-based. Composio pricing: Free · paid from $29/mo. Confirm current pricing on each tool's official site, as plans change.
Which is rated higher, ACI.dev or Composio?⌄
In our catalog, ACI.dev rates 4.1 out of 5 and Composio rates 4.6 out of 5, so Composio has a slight edge on reviews.
See more options in our guide to the best agent auth & tool calling tools for startups.
In-depth guideComposio vs Arcade (2026): Agent Auth & Tool Calling, Plus Open-Source Nango and ACI.devYour agent has to act inside Gmail, Slack and Salesforce as each of your users, without the model seeing a token. Composio and Arcade compared with Nango and ACI.dev on OAuth handling, licence and cost at 50 and 1,000 users.Still not sure which to pick?
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