Turning off a normal alarm takes one thumb and no thought. That is why you can dismiss it, fall straight back to sleep, and remember none of it.

Math Alarm Clock will not switch off until you solve a math problem. By the time the noise stops, you have done arithmetic — a far higher bar than finding a button.

SOLVE MATH TO WAKE UP

When the alarm rings, the screen shows a math problem with four answers. Solve it and the alarm stops. Get one wrong and you get a new problem, so tapping every answer in turn gets you nowhere.

Choose how hard it is and how many problems you have to solve. Easy is adding and subtracting two-digit numbers. Hard is genuinely difficult at six in the morning, which is the entire point.

BUILT FOR HEAVY SLEEPERS

If you have ever switched off an alarm in your sleep, or woken up an hour later with no memory of it, this is an alarm clock for heavy sleepers that makes that much harder to do.

There is no snooze unless you want one. A one-off alarm switches itself off after it rings, so a spent alarm never sits in your list pretending to be armed.

YOU ARE NEVER TRAPPED

An alarm you cannot switch off is a bad idea, so the challenge steps down if you are genuinely struggling. After enough wrong answers, or enough time, a Hard alarm becomes Medium. Keep struggling and an emergency exit appears.

You can also try any alarm's challenge from your alarm list, silently and without waiting for it to ring, so you know exactly what you are signing up for before you rely on it.

TRY EVERYTHING FREE FOR 7 DAYS

Math not enough? Pro makes it a challenge alarm with more ways to wake up: a shake challenge, a memory puzzle, and your own audio files as alarm sounds. Every new install gets all of Pro for seven days. Then keep it with one payment, with no subscription, or keep using the free version, with everything in the list below. Your alarms keep ringing either way.

A RELIABLE ALARM THAT ACTUALLY RINGS

An alarm that does not go off is worse than no alarm at all, and phones make this harder than it sounds. Battery savers suspend apps. Manufacturers block them from starting themselves. Do Not Disturb silences things.

Math Alarm Clock includes a one-time setup that checks each of these on your device, says in plain English what each missing one costs you, and links straight to the setting that fixes it. Some manufacturer restrictions cannot be read by any app, so you can run a real 15-second test alarm and see for yourself whether one reaches you with your phone locked.

NOTHING INTERRUPTS THE ALARM

No ads. Not on the alarm screen, not anywhere. Nothing asks you to buy something while you are standing there trying to wake up.

EVERYTHING STAYS ON YOUR PHONE

Math Alarm Clock has no internet permission at all. Not a promise not to look — Android will not let it make a network connection.

No account. No sign-in. No analytics. No trackers. Your alarms, your settings and your results never leave the device, and it all works with no connection.

Buying Pro goes through Google Play, which handles the payment. Math Alarm never sees your card or your email.

WHAT YOU GET, FREE

• Solve math to dismiss the alarm, with Easy, Medium and Hard levels
• Choose how many problems each alarm asks for
• A challenge that eases off if you are truly stuck, plus an emergency exit
• Rings over the lock screen, and through silent and Do Not Disturb
• Built-in alarm sounds and two vibration patterns
• Repeat on chosen days, or a one-off alarm that disarms itself
• Snooze, or no snooze at all
• Up to four alarms switched on at once
• A setup check that tells you whether your phone will really deliver alarms
• No ads, no account, no data collection

WITH PRO

• Shake and memory puzzle challenges, alongside math
• Wake up to your own audio files
• Two premium sounds and two extra vibration patterns
• A different volume for each alarm
• Unlimited alarms switched on at once