AppFlowy vs Outline

AppFlowy is an open-source collaborative workspace that covers notes, wikis, databases and project boards, positioned as a privacy-focused alternative to Notion. It is built with Flutter for the interface and Rust for the core, so it ships as native apps for macOS, Windows, Linux, iOS and Android rather than a web wrapper, and its source code is published on GitHub under the AGPL license.

The core product combines rich documents with databases that can be viewed as a grid, kanban board or calendar, plus templates, offline mode and an AI assistant for writing, summarising and asking questions about your content. You can use AppFlowy Cloud as a hosted service with a free tier and paid per-user plans, or self-host the backend with Docker so that every page and database stays on your own servers.

AppFlowy fits developers, privacy-conscious teams and organisations with data residency rules who want a Notion-style experience without handing their content to a third party. It is less mature than Notion in integrations, templates, permissions and the polish of real-time collaboration, and its plugin ecosystem is small. Anytype is the other well-known open-source, local-first option; AFFiNE combines docs with whiteboards; Notion remains the safer choice when a broad integration ecosystem matters more than data ownership.

Outline is a fast, modern knowledge base and team wiki built by a small independent team. It offers a clean Markdown-friendly editor with slash commands and real-time collaboration, collections that group nested documents with their own permissions, and quick full-text search, all with a focus on speed and simplicity. The source code is public under the Business Source License, which allows free self-hosting, and a hosted cloud version is sold by the same team.

Key features include single sign-on with Slack, Google, Microsoft Entra ID, Okta and other OIDC providers, document history and restore, templates, comments, public sharing and publishing of collections, an AI feature that answers questions from your documents, and a REST API with webhooks. Hosted plans are priced per workspace rather than per user, with flat monthly tiers based on team size bands such as up to 10 or up to 100 members, which makes it unusually affordable for teams near the top of a band.

Outline fits engineering-led companies and teams who want a fast, focused wiki, either self-hosted for data control or hosted at a predictable cost. It is a wiki only: there are no databases, task boards or project views, the template library is limited, and self-hosting requires Postgres, Redis and file storage. Notion suits teams that want docs, databases and projects in one tool, Confluence fits Atlassian-centric organisations, and Slite or Nuclino are other lightweight hosted wikis.