Lupin vs Nango: code-owned integrations and configured agent app tools

Nango is an integration runtime as well as authentication

Nango’s current introduction organizes its product around Auth and Functions. Users connect external accounts, while developers own TypeScript integration functions for actions, synchronization, transformations or webhooks. Those functions can be consumed through APIs, SDKs or selected agent tools. Lupin Connections instead exposes configured toolkit discovery and execution inside a wider agent workspace. The main distinction is ownership of integration logic: code your team customizes and versions, or a supported provider tool surface your application discovers and invokes.

Customer-specific logic can favor Nango

A CRM integration may need a different field mapping for each customer, background synchronization and a specialized validation step before writing. Nango’s documented functions and code-owned customization are relevant to that requirement. Lupin’s connection execution accepts the exact arguments of discovered tools and binds them to a verified active account; it does not expose arbitrary provider request URLs or credential overrides. That is useful for bounded agent actions, but it should not be presented as a general synchronization or integration-code platform.

A synchronized data model has different guarantees

An agent fetching one CRM record on demand is different from a product maintaining a local copy of an entire customer account. For synchronization, define freshness, deletions, pagination, checkpoints and partial-failure behavior. Nango documents runtime responsibilities including retries and rate-limit handling, but your function’s business contract still needs validation. Lupin tool discovery is suited to checking what a configured action accepts and returns; it does not establish a durable sync contract by itself. Choose the architecture based on how the data is consumed, not just whether a connector exists.

Code ownership brings review responsibility

Generated integration code should be inspected like other application code, including its account selection and external writes. Nango’s code-owned model can make those changes explicit in version control. Lupin instead pins execution to a concrete discovered tool version and connection revision, with exact app-action approval in its consumer agent. External MCP clients supply their own consent interface. Both paths require your application to preserve which account and arguments the user authorized. Managed credentials reduce token handling; they do not automatically approve every operation those credentials permit.

Model maintenance together with runtime

Estimate connected accounts, function execution, synchronization volume, schedules, storage and support effort under current Nango terms. Include the cost of reviewing and maintaining custom integration code. Lupin meters app actions and successful connections alongside separately metered resource families. Nango may be preferable when integration behavior is part of your product’s differentiation and requires code-level control. Lupin may be preferable when a supported set of app tools is enough and the agent also needs inboxes, browsers or execution. Avoid equating fewer lines in a quickstart with less long-term maintenance.

Evaluate a mapping change and an account reconnect

Choose one customer-specific transformation and one reconnect scenario. Write the expected output and the authority required for any resulting write before evaluating either provider. Map the transformation to Nango Functions and check whether Lupin’s actual discovered tools can satisfy it without inventing a missing operation. Confirm that an account switch invalidates prior reviewed context. Prefer Nango when custom integration logic and background data movement are core requirements. Prefer Lupin when the configured action surface fits and shared resource ownership removes work your application would otherwise need to build.

A Nango migration should retain your reviewed TypeScript functions, mappings and synchronization checkpoints as application assets. Lupin’s discovered tools may require a new contract rather than a direct function port. Reauthorize destination accounts through supported flows and validate deletions and refresh behavior before moving a background data pipeline.

Sources & verification

Official documentation and Lupin public documentation/source were reviewed on 2026-11-05. This is an architecture and operating-scope comparison, not a live benchmark, hands-on provider test or independent review of service quality.

• Nango introduction ↗Checked 2026-11-05
• Lupin connections documentation ↗Checked 2026-11-05
• Lupin bounded agent registration ↗Checked 2026-11-05

Prepared with AI assistance by Lupin editorial. How we research and maintain these guides.