Last updated September 2026.
MasteryHub is a free fan project that builds a mosaic or a card from a public RetroAchievements profile. There is no account to create and nothing paid. Using the site means agreeing to these terms.
MasteryHub is not operated, endorsed or affiliated with RetroAchievements.org. It reads data made public through their API and does not use their logo, wordmark or letterforms. Game artwork and achievement data belong to their respective owners.
Mosaics and cards are built from whatever RetroAchievements' public API currently returns. That data can lag behind a profile's real state — a fresh mastery can take a little while to appear here — and this site has no way to correct or verify it independently. If something looks wrong, it is worth checking the profile directly on RetroAchievements.org.
Do not use this site to automate bulk requests, attempt to bypass its rate limits, or otherwise place load on it or on RetroAchievements' own servers beyond ordinary use. RA is run by volunteers, and the courtesy that deserves extends to anything built on top of it.
This site is provided as-is, with no guarantee that it will be available, accurate or error-free. It is built and maintained by one person as a fan project, without a service-level commitment, and can change or stop at any time.
These terms may be updated as the site changes. Continued use after a change means accepting the updated terms.