iOS · iPadOS · macOS · Offline
A problem a day, worked properly.
Short, exact practice across calculus, physics, chemistry and logic. I built it to generate every problem on your device, check every answer exactly, and let nothing you do leave the machine.
What's inside
Ten subjects, two olympiad tracksDAILYA fresh set every day across the subjects you choose, with a streak that only counts your first attempt.
PRACTICEIntegrals, derivatives, limits, ODE/PDE, logic, mechanics, E&M, circuits, chemistry and quantum.
COMPETITIONMIT Integration Bee style timed rounds, from one-minute qualifying to five-minute finals.
OLYMPIADIMO and Putnam tracks, generated with exact integer arithmetic rather than drawn from a fixed bank.
EXPLAINEDEvery problem carries a hint, a worked solution, and wrong answers that name the specific mistake they represent.
REVIEWProblems you miss collect for later and retire themselves once you get that family right.
Support
Common questions- Does it need an internet connection?
- No. Problems are generated on device and the mathematics typesetting engine is bundled inside the app. It works fully offline, including on a plane.
- Do I need an account?
- No. There is no sign-in, no server, and no account of any kind.
- What data is collected?
- None. Your progress is stored only on your device. See the privacy policy.
- Are the problems repeated from a question bank?
- No. I wrote each family to draw its own parameters and compute the answer in code, so the pool is effectively unbounded and every answer is correct by construction.
- Is there a subscription?
- No. It is a one-off purchase with no in-app purchases, no subscription, and no advertising.
- How do I report a problem or a wrong answer?
- Open an issue on the release repository, including the problem title and what you expected.