Warframe Mastery Tracker

Every masterable item with build info. Check off what you own — completed items move to the bottom.
Mastery progress0%
✓ Category Item MR Build recipe / how to obtain Wiki
Completed (0)
✓CategoryItemMRRecipeWiki
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Progress is kept in this browser and mirrored automatically. For a power outage or new computer, use Export occasionally — the file lands in Downloads.

— quick recovery if you're high MR and own almost everything (then uncheck what you're missing).