DAXionary

DAXionary is your pocket DAX coach for Power BI. Learn DAX, write better measures, and build dashboards that actually make sense — completely free, with no ads and no account.

KEY FEATURES
• Complete DAX library
All 350 DAX functions, organized into 14 categories. Search by name or by what you're trying to do, and save favorites for quick access.
• Explained in plain English
Every function comes with a clear explanation, syntax you can copy in one tap, and the measure patterns that use it.
• DAX Assistant — works offline
Ask about a function, a concept or a calculation and get an answer with working DAX code. It runs entirely on your phone using the app's built-in library — no internet, no account.
• Measure Builder
22 ready-made patterns, including running totals, rankings, year-over-year change, year-to-date and percent of total. Enter your own table and column names and copy the finished measure.
• Concept guides
Filter context, row context, context transition, CALCULATE, relationships, time intelligence and more, explained simply.
• Quiz mode
Test yourself with timed quizzes: Quick (5 questions), Standard (10) or Challenge (15), with an honest score at the end.
• Light and dark themes
Comfortable reading, day or night.

FREE AND PRIVATE
No ads. No sign-ups. Nothing tracked. Everything is stored on your device and works offline.

Whether you're preparing for a Power BI project, studying for a certification, or just tired of your measure returning (Blank), DAXionary helps you understand DAX and use it with confidence.

Recent changes:
Removed all advertising. The app is now fully offline — the DAX reference, quiz and assistant work with no internet connection and no ads.