Arcade vs Composio vs Nango vs Swytchcode (2026): Which Agent Tool Layer Fits?

Arcade, Composio, Nango, and Swytchcode all connect AI agents to external APIs, but they solve different problems. Arcade is built for agents acting as a specific end user. Composio is a hosted tool catalog with managed OAuth. Nango is for integrations your team owns as code. Swytchcode is an execution kernel that governs each API call with policy, approval, safe retries, and an audit log.

This comparison uses the same criteria for all four products. Every vendor figure comes from that vendor's own docs or pricing page, checked in October 2026. Where a vendor publishes two different numbers, both are named. Swytchcode is our product, so we list it last and stick to documented facts.

Arcade vs Composio vs Nango vs Swytchcode at a glance

"Not documented" means the vendor's public docs did not describe the capability when we checked. It does not mean the feature is impossible.

What is Arcade?

Arcade is an actions runtime for agents that must act as a specific person. Its docs describe three jobs: enforce per-action authorization against the user and your identity provider, run agent-optimized tools, and govern them from one registry. If a user has not granted Gmail send, Arcade runs the OAuth prompt before the tool runs. The about page, updated 9 September 2026, cites 7,500+ tools across 81 MCP servers, while arcade.dev/llms.txt says 7,000+. Execution includes parallelized calls, automatic failover, and retries, and audit logs are emitted in OpenTelemetry format.

Best for: user-facing agents where every action must run with that person's OAuth grant, and security wants one enforcement point. Pricing: free for 2,000 tool calls and 2,000 auth events a month; Team is $25 a month plus usage.

What is Composio?

Composio is a hosted tool catalog with per-user managed OAuth. Each tool call runs as a specific end user against that user's connected Gmail, Slack, or GitHub account, and hosted Connect Links handle the sign-in. Its docs list 1,595 toolkits, reachable through Python and TypeScript SDKs or a single MCP URL. Composio is quick to start because the tools are prebuilt and the OAuth apps are managed for you.

Best for: consumer or multi-tenant agents that need a broad catalog of pre-authorized SaaS tools fast. Pricing: free for 100K tool calls a month; Pro is $29 a month.

What is Nango?

Nango is an integration platform for product teams. Your customers connect their accounts through embedded OAuth, and you write TypeScript functions that call provider APIs, run two-way syncs, and process webhooks on Nango's infrastructure. Those functions can be exposed to agents through Nango's API or MCP. Nango handles token refresh, rate-limit backoff, and retries, with logs, metrics, and alerts per connection. The trade-off is that you own the integration code, which is more work than a prebuilt catalog and is the right work when the integration is part of your product.

Best for: customer-facing integrations that must be reviewable code, including data syncs. Pricing: a free tier; current paid prices are on nango.dev/pricing.

What is Swytchcode?

Swytchcode is an execution kernel that sits between your AI agents and the APIs they call. It runs on infrastructure you own, checks policy before every call, brokers credentials, retries safely without duplicate writes, and logs every call and decision locally. Every call passes the same stages: the method must be on the project allowlist, inputs are validated against the API schema, policies can block the call or hold it for human approval, and errors come back in one shape with a retryable flag.

Swytchcode is built for production systems where a wrong call is expensive: payments, customer records, and legacy or internal APIs with years of versions and partial documentation. You bring those in through an OpenAPI spec or Postman collection, and they get the same validation, policy, and retry rules as catalog APIs. The same kernel serves LangGraph, CrewAI, the OpenAI Agents SDK, the Anthropic SDK, the Vercel AI SDK, and MCP clients such as Claude Code and Cursor.

Best for: production agents that write to real APIs and need policy, approval, safe retries, and an audit trail on every call. Pricing: Developer is free for 10,000 live commands a month; Pro is $29 a month and adds allow and deny rules; Business is $149 a month and adds human approval, team seats, and your own providers; Enterprise is custom and deploys in your own cloud account.

Arcade vs Composio

Both run tools as the end user. Arcade leads with authorization and governance: per-action checks against your identity provider, a central registry, and OpenTelemetry audit logs. Composio leads with catalog breadth and speed to start, with 1,595 toolkits and a larger free tier. Choose Arcade when a security team needs one enforcement point for user-delegated actions. Choose Composio when you want the most prebuilt tools with the least setup.

Composio vs Nango

The split is prebuilt versus owned. Composio gives an agent ready-made tools behind one MCP URL. Nango gives your team a platform to write, deploy, and review its own integration functions, plus syncs and webhooks that a tool catalog does not cover. Choose Composio for an internal or consumer agent that needs common SaaS actions today. Choose Nango when integrations are part of your product and must live in your repo.

Arcade vs Nango

Arcade is an agent-first runtime with a large catalog of tools that act as the user. Nango is a product-integration platform where the agent is one consumer of functions you write. Choose Arcade when the agent is the product and needs many user-authorized actions. Choose Nango when the integration also powers non-agent features such as data syncs.

Where Swytchcode fits against all three

Arcade, Composio, and Nango answer "how does my agent get access to this app?" Swytchcode answers "how does this call run safely in production?" The differences show up after the agent has decided what to do:

• Write safety. Swytchcode retries POST and PATCH calls only when an idempotency key is set, so a timeout does not turn into a second charge or a duplicate ticket. Idempotency on writes is not described in the other three products' public docs.
• Argument-level policy. Policies read the call's arguments, so you can block payments over a limit, hold external emails for approval, cap daily spend, or block production deletes, in a file reviewed in Git.
• Human approval. Matching calls wait for a yes or no in Slack or Telegram, and run once when approved.
• Your infrastructure. Credentials, policy, and the audit log stay on machines you control, and requests go straight to the provider.
• Legacy and internal APIs. Any REST API with an OpenAPI spec or Postman collection gets the same controls as catalog APIs.

Where Swytchcode is the weaker fit: if your only need is a hosted catalog of thousands of consumer SaaS tools where every user signs in with their own account, Arcade or Composio will get you there faster.

Which one should you choose?

Can you use them together?

Yes. They sit at different layers. A common setup uses Arcade or Composio for end-user apps like Gmail and Slack, Nango for product integrations and syncs, and Swytchcode for the calls where a failure or a duplicate is costly, such as payments, CRM writes, and internal systems. Because Swytchcode runs as a CLI, MCP server, or SDK, it can be added next to an existing tool layer without rewriting the agent.

How we compared

We checked each vendor's documentation, llms.txt, and pricing page in October 2026: Arcade's about page (updated 9 September 2026), arcade.dev/llms.txt, and arcade.dev/pricing; Composio's docs and composio.dev/pricing; Nango's docs and nango.dev/pricing; and docs.swytchcode.com and swytchcode.com/pricing. Prices and catalog sizes change often, so confirm them before you buy.

FAQ

What is the difference between Arcade and Composio?
Both run tools as the end user. Arcade focuses on per-action authorization and governance, with OpenTelemetry audit logs and identity-provider integration. Composio focuses on a large hosted catalog (1,595 toolkits) with managed OAuth and a 100K-call free tier.

What is the difference between Composio and Nango?
Composio provides prebuilt tools behind one MCP URL. Nango provides a platform to write and run your own TypeScript integration functions, with embedded OAuth, syncs, and webhooks.

Which is cheapest: Arcade, Composio, Nango, or Swytchcode?
All four have free tiers. Composio's is 100K tool calls a month, Swytchcode's is 10,000 live commands, and Arcade's is 2,000 tool calls plus 2,000 auth events. Paid entry is $25 a month plus usage for Arcade Team, $29 a month for Composio Pro and Swytchcode Pro, and listed on nango.dev/pricing for Nango. The cheapest option depends on what each product meters for your workload.

Which one prevents duplicate writes when an API call is retried?
Swytchcode documents idempotency keys on writes and retries POST and PATCH calls only when a key is set. Idempotency on writes was not described in Arcade's, Composio's, or Nango's public docs in October 2026.

Which one works with legacy or internal APIs?
Nango works if you write a TypeScript function for the API. Arcade works if you register your own MCP server. Swytchcode takes an OpenAPI spec or Postman collection and applies validation, policy, retries, and audit to every call.

Swytchcode resources

• Swytchcode vs Arcade: https://www.swytchcode.com/compare/swytchcode-vs-arcade
• Swytchcode vs Composio: https://www.swytchcode.com/compare/swytchcode-vs-composio
• Swytchcode vs Nango: https://www.swytchcode.com/compare/swytchcode-vs-nango
• 10 Arcade alternatives: https://www.swytchcode.com/content/arcade-alternatives-in-2026
• 10 Composio alternatives: https://www.swytchcode.com/content/composio-alternatives-in-2026
• 10 Nango alternatives: https://www.swytchcode.com/content/nango-alternatives-in-2026
• AI agent execution layer architecture: https://www.swytchcode.com/content/ai-agent-execution-layer-architecture
• Swytchcode pricing: https://www.swytchcode.com/pricing