
FusionAuth
8.3#1 in authentication softwareFrom $162 a monthFree planAndroidiOSWebAPI
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FusionAuth suits teams managing end-user identity that want deployment choices from self-hosting to managed cloud. It is not positioned as a desktop integration or Active Directory replacement.
It is intended for merchants, developers, wallets, and platforms or marketplaces handling agent-driven commerce. Developers using stacks other than Node can use the REST APIs instead of the TypeScript-first MCP SDK.