MasteryHub is a fan project for RetroAchievements hunters. It reads the games a public RA username has mastered and turns them into something worth sharing — a mosaic of every set you have finished, or a card for one of them.
There is no account system here and nothing is stored against you personally. A username is looked up, the public data RA already publishes is fetched, and the result is cached briefly so the same profile is not re-fetched on every visit. Anything you customise — colours, sizes, layout — lives only in your own browser.
MasteryHub is built and run by one person, is not affiliated with RetroAchievements.org, and does not use their logo, wordmark or letterforms — the brand here is original. Game artwork and achievement data belong to their respective owners.