Notion

Identity, authentication, and account management for your users.

Let users find content quickly — from simple filters to full-text and semantic search.

Upload, store, and serve user-generated files — documents, images, and media.

Alert users about events relevant to them across multiple delivery channels.

Let external developers and integrations interact with your product programmatically via a documented REST API and outbound webhooks.

Control who can do what inside your product — from simple role toggles to fine-grained, resource-scoped authorization.

Let users discuss objects in your product — posts, documents, PRs, designs — with threading, mentions, and moderation.

Show users a chronological or ranked stream of relevant events — follows, posts, mentions, workspace activity — with real scaling considerations.

Guide new users from sign-up to their first meaningful outcome — the moments that determine whether they ever come back.