drillio: Flash Anzan & Math

drillio helps you build real mental math skills with soroban-style flash anzan and arithmetic drills.
41 flash anzan levels (from beginner to 20th dan) and 278 arithmetic lessons. All core learning is free.

FLASH ANZAN
- 41 levels: beginner, 20th kyu to 1st kyu, then 1st to 20th dan
- Master a level by answering correctly 10 times, and earn a certificate
- Frame-accurate display timing, so even the fastest flashes are shown precisely
- Custom mode: choose your own digits, number of terms and display time
- Your fastest answer is saved automatically

ARITHMETIC DRILLS
- 278 lessons in addition, subtraction, multiplication and division, from basic to advanced
- 2-digit x 2-digit, 3-digit problems, fill-in-the-blank problems and more
- Earn more points the faster you answer, and see your progress for each lesson

CHALLENGES
- Time Attack: solve as many problems as you can before time runs out
- Oni Calc: answer the problem from N steps back, training memory and calculation together

KEEP GOING
- Daily streaks, study time and points
- Reminders before your streak ends

drillio PRO (optional)
- No ads
- Dark mode
- Streak recovery
- Priority support
Subscriptions renew automatically unless cancelled.

Terms of Use: https://gist.github.com/aviciida/c635fb7d61c24c8df4f39506902f3ca6
Privacy Policy: https://gist.github.com/aviciida/f9dd03234fa3de0b23aa536073abcca4