AltCatalog

AltCatalog is a website for finding alternatives to software applications. Lists of alternatives are ordered by an Alt Score composed of two parts: 80% fit, based on the overlap of verified features and platforms between the alternative and the app being replaced, and 20% attention, based on interest measured on the site over the previous 30 days. The breakdown behind any score can be opened and inspected.

Each factual claim on an app page links to a source and the date it was checked; unconfirmed values are shown as a question mark rather than an estimate. Changes can be proposed by anyone with a supporting source, and are published only after review by a human moderator. All edits and moderation decisions are recorded in a public history on each app's page.

Vendors can correct their own listings and respond to criticism publicly, but cannot remove or reorder competitors. Sponsorship is limited to one labeled slot per page and does not affect rankings. App submission is free through a community queue, with an optional paid fast-track review that is refunded if the submission is rejected.

The catalog covers 1,400+ applications across categories including development tools, productivity software, and AI frameworks, and also tracks discontinued software with suggested replacements.