Best Developer Infrastructure For API Access Integrations And Secrets

Unkey sits on the external API boundary, controlling who can access an API and how usage is measured. Nango sits on the integration boundary, handling auth, syncs, proxying, and reliable external API connectivity. Infisical sits on the internal credentials boundary, securing secrets and identities across environments and infrastructure.

That separation is why these three belong together in an editorial comparison even though they are not substitutes in the narrowest product sense.

This is a rare category where all three products publish pricing that is actually useful. Unkey publishes simple request-based entry pricing. Nango publishes detailed usage units across integrations, proxying, compute, and storage. Infisical publishes identity-based pricing plus explicit limits for projects, environments, and integrations.

That makes them much easier to compare credibly than many adjacent security and infrastructure vendors.

Choose Unkey when the product itself exposes APIs and needs controlled access and monetization logic. Choose Nango when the product needs reliable integrations with other systems. Choose Infisical when the team needs safer secret distribution and identity-aware credential workflows across environments.

Many mature software teams may use all three because each one addresses a separate operational responsibility.