Agent Auth & Tool Calling

The 3 Best Composio Alternatives in 2026

Looking for an alternative to Composio? Below we compare the best agent auth & tool calling alternatives by pricing, free tiers, and what each is best for — so you can pick the right fit for your budget and stack.

Category

Agent Auth & Tool Calling

Composio pricing

Free tier available

Free tier

Yes

Alternatives

3 compared

Why look for a Composio alternative?

Composio is a solid agent auth & tool calling choice, but it isn't the right fit for everyone. The most common reasons teams evaluate alternatives:

  • −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

Composio vs Alternatives — Quick Comparison

ToolPricingFree tierRating
ComposioYou searchedFree · paid from $29/mo4.6
1.ArcadeFree · paid from $25/mo4.5
2.NangoFree · paid from $50/mo4.5
3.ACI.devFree · then usage-based4.1

Top Composio Alternatives, Explained

Arcade

1. Arcade

Free tier4.5· Free · paid from $25/mo

Arcade.dev runs the tools an agent calls and handles user sign-in for each one, so the agent acts as the authenticated user rather than a shared service account. Every call is limited to what both the user and the agent are allowed to do, and pre- and post-call hooks let you block actions or redact data without forking the runtime. Arcade says its team wrote the MCP tool authorization specification. Custom tools are built with its open-source Python or JavaScript framework (arcade-mcp, MIT). It states SOC 2 compliance, and Enterprise can run in your VPC or fully air-gapped. Free includes 2,000 authorization events and 2,000 tool calls a month; Team is $25/month plus $0.10 per authorization event and $0.01 per tool call; Enterprise is an annual bundle.

  • Per-call authorization scoped to user and agent
  • Policy hooks to block or redact without forking
  • Self-host in your VPC or air-gapped on Enterprise
Arcade pricing & review Composio vs Arcade
Nango

2. Nango

Free tier4.5· Free · paid from $50/mo

Nango handles OAuth, API keys and token refresh for 1,000+ APIs and lets you expose any integration as a tool through its MCP server. Unlike tool-calling-only platforms it also runs incremental data syncs and verified webhooks, so the same integration can feed RAG and trigger agents. Integrations are written as code, which coding agents can generate. The code is on GitHub under the Elastic License 2.0: source-available, free to self-host and embed, but not open source by the OSI definition and not resellable as a hosted service. The free self-hosted build covers auth and the proxy; syncs, tool calls and the MCP server need a paid plan or Enterprise self-hosting. Cloud: Free (10 connections, hard-capped), Pay-as-you-go $50/month including $50 of credit ($0.29 per connection, $0.72 per compute hour, $0.50 per GB), Enterprise custom with BYOC.

  • 1,000+ APIs with managed OAuth
  • Syncs and webhooks as well as tool calls
  • Source on GitHub; free self-host for auth
Nango pricing & review Composio vs Nango
ACI.dev

3. ACI.dev

Free tier4.1· Free · then usage-based

ACI.dev (Agent-Computer Interface) is an Apache-2.0 platform that connects agents to 600+ tools through direct function calling or one unified MCP server. It includes multi-tenant OAuth flows and secrets management for each of your end users, dynamic tool discovery, and natural-language permission boundaries on what an agent may do. You can run the full backend and frontend yourself or use the managed service at aci.dev. It is the most permissively licensed option in this category, but the main repository has had no commits since May 2026, so check its activity before you depend on it.

  • Apache-2.0: truly open source and self-hostable
  • Multi-tenant OAuth for end users built in
  • One MCP server for all tools
ACI.dev pricing & review Composio vs ACI.dev
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.

Frequently Asked Questions

What are the best alternatives to Composio in 2026?⌄

The best Composio alternatives in 2026 are Arcade, Nango, ACI.dev. Each is a agent auth & tool calling option you can compare on pricing, free tiers, and features in the table above.

Is there a free alternative to Composio?⌄

Yes — Arcade, Nango, ACI.dev offer free tiers, making them strong free Composio alternatives for bootstrapped startups.

Why look for a Composio alternative?⌄

A common reason teams switch is hosted only; no self-host option published. Beyond that, people compare agent auth & tool calling tools on pricing, specific feature gaps, ease of use, and whether an open-source or free-tier option exists — so they can pick the best fit for their stack and budget.

What is the cheapest Composio alternative?⌄

Arcade is among the most affordable Composio alternatives — free · paid from $25/mo. Check the comparison table above for the full pricing breakdown.

Which Composio alternative is rated highest?⌄

Arcade is the highest-rated Composio alternative in our catalog at 4.5 out of 5, making it a strong pick if you want a well-reviewed option.

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