Nango alternative for AI agents that write in your users' accounts

Nango is an integration layer: it runs auth for 1,000+ APIs and hosts the TypeScript functions your app and agents call. Anlyon is for the moment your agent starts writing in your users' own accounts, where each write needs a limit for that user, that user's yes on risky steps, and a receipt that says what the provider actually recorded.

Pick Nango for breadth, syncs and custom integration code. Pick Anlyon when a wrong CRM update or a duplicate message in a customer's workspace would be your problem. Many teams will want both.

This is an Anlyon-authored comparison, not an independent review. Every fact about Nango below comes from Nango's own docs or site, fetched on 2026-11-02, with the page linked. Where we looked and did not find something, we say so and nothing stronger.

What Anlyon does for an agent that writes in users' accounts

Your server names the user. The agent names an action. Anlyon makes the call with that user's account.

const user = anlyon.forUser(session.user.id);
const r = await user.actions.invoke('hubspot-update-deal-stage', {
  dealId: '123',
  dealstage: 'contractsent',
});

Around that call, six things happen that you would otherwise build:

• A limit per user, counted before the call. A limit such as 20 CRM changes per user per day is reserved before dispatch. Over the limit, the call is refused before anything reaches HubSpot. One user cannot use up another's allowance. See per-user limits.
• An approval the user decides in your app, bound to the exact request. A policy can send, say, closing a deal to the user it is for. The approval is bound to a SHA-256 digest of the request, target and preconditions, recomputed before dispatch. What the user approved is what runs. See end-user approval in your app.
• A graded receipt per write. confirmed means a read-back of the provider's own record matched. acknowledged means the provider accepted and nothing read it back. unknown means no usable response, and Anlyon does not resend.
• The server binds the user. The tools handed to the model have no user field, and a forUser client cannot be switched to another user. If your code passes a user id taken from model output, you defeat this.
• Connect-confirm. When the user comes back from consent, your server confirms the connection from your own session. A flow started for someone else is refused, so a forwarded link cannot attach another person's account to your user.
• Erase in one call. anlyon.endUsers.erase(user.id) revokes connections at the provider where it supports that, deletes them, cancels pending approvals and clears limit counters. Kept records carry a keyed one-way hash in place of the user id.

The limits, stated once. The list is shorter: sign-in for HubSpot, Slack, Linear, GitHub and Notion, plus about 27 tools that connect with the user's own API key, such as Attio, Asana, Jira and Stripe. Gmail, Google Calendar and Salesforce are not live yet. End users are supported over the HTTP API and the TypeScript and Python SDKs, not over MCP or the CLI yet. Anlyon is a small company.

What Nango does

All as of 2026-11-02, from Nango's own pages.

• What it is. Nango's docs say: "Embed Nango Auth in your product so users can connect accounts from external APIs." Its two core pieces are Auth and Functions, TypeScript functions you write that Nango runs (Nango docs).
• Catalogue. "Nango supports 1,000+ APIs" (Nango docs).
• Per-user auth. Your backend creates a connect session and your frontend opens Connect UI. Tags such as end_user_id link the new connection to your user, and the docs say to "persist connectionId against whichever entity owns the connection in your app." The guide also says "Nango doesn't model that ownership" (auth guide).
• Tokens. "Nango handles OAuth, API keys, token refresh, scopes, permissions, and credential storage," with "encrypted storage, automatic refresh, retrieval at scale" (auth guide).
• Agents. Nango offers action functions as tools, an MCP server, and agent sessions. "The agent never sees raw credentials, and cannot change the scope of its own session." The connection is resolved when the session is created, and "the agent names an integration and never a connection" (agent sessions, tool calling).
• Approvals. We did not find an approval step for tool calls in Nango's tool-calling or agent-session docs, or in its docs index, as of 2026-11-02.
• Rate limits. Nango's rate-limit guide covers provider limits: retries with exponential backoff and parsing a provider's rate-limit headers (rate limits). We did not find a limit you set per user on agent writes as of 2026-11-02.
• Logs. "Logs, metrics, alerts, isolated environments" (observability). Tool calls from an agent session appear in Nango logs (agent sessions).
• Deletion. The API "deletes a specific connection." The page does not say whether it revokes at the provider (delete a connection).
• Self-hosting. BYOC and Self-Managed on Enterprise, plus "a limited free self-hosting option" for hobby projects covering auth and proxy (self-hosting).
• Pricing. Free with hard caps, Pay-as-you-go at $50/month in credits, metered per connection ($0.29), compute hour ($0.72) and GB ($0.50), and Enterprise at custom pricing (pricing).

Nango vs Anlyon, row by row

Nango's agent sessions deserve the credit they are due: pinning the connection when the session is created is a sound way to stop a model from picking an account. Anlyon gets to the same place a different way, by keeping the user out of the tool schema altogether.

When to choose Nango

• You need integrations Anlyon does not have, including Gmail, Google Calendar or Salesforce today. Nango lists 1,000+ APIs.
• Your product needs syncs, webhooks and custom integration code, not just agent tool calls.
• You want to self-host, through Nango's BYOC or Self-Managed options on Enterprise.
• Your agent mostly reads, or its writes are low stakes, and you would rather keep approval logic in your own app.
• You want pricing per connected account and compute.

When to choose Anlyon

• Your agent writes in your users' HubSpot, Slack, Linear, GitHub, Notion or one of the API-key tools, and a wrong write would land on you.
• You want each user to have their own ceiling, enforced before the call, without building counters.
• You want the user to approve risky steps in your own app, and you need what they approved to be exactly what runs.
• You want a receipt per write that says whether the provider's own record matched.
• You need to erase a user's connections and pending work in one call when they leave.

Using both

This is a common shape. Keep Nango for the long tail: the APIs Anlyon does not cover, your syncs, and your custom functions. Route the writes that need a per-user limit and the user's approval, such as moving a deal to closed won or posting in a customer's Slack, through Anlyon.

Two things to know. Each user connects separately in each product: a connection made in Nango is not passed to Anlyon, and the reverse is also true. And the guarantees in this page apply to calls that go through Anlyon. A write made through Nango is outside Anlyon's limit and receipt.

For the wider picture, read how to let your AI agent act in your users' accounts, the agent auth platforms compared roundup, and Anlyon vs Arcade and Composio.

Sources

All fetched 2026-11-02.

• Nango docs home: https://nango.dev/docs
• Nango auth guide: https://nango.dev/docs/guides/auth/auth-guide.md
• Nango tool calling: https://nango.dev/docs/getting-started/use-cases/tool-calling.md
• Nango agent sessions: https://nango.dev/docs/guides/agent-sessions.md
• Nango rate limits: https://nango.dev/docs/guides/functions/rate-limits.md
• Nango observability: https://nango.dev/docs/guides/platform/observability.md
• Nango delete a connection: https://nango.dev/docs/reference/backend/http-api/connections/delete.md
• Nango self-hosting: https://nango.dev/docs/guides/platform/self-hosting/self-hosting.md
• Nango docs index: https://nango.dev/docs/llms.txt
• Nango pricing: https://nango.dev/pricing
• Anlyon: act for your users, end-user connections, outcomes