Knows your rotation
A/B, odd/even, or any 2–8 day rotation — plus traditional weekly schedules. Set it once at the start of the year and it tracks every day for you, including the days you don't teach.
Built for K–12 teachersIs today an A-day?
Is today an A-day?
Your alarm already knows.
ScheduleLock is the alarm app for teachers on rotating block schedules. It tracks your school's rotation, fires alarms only on school days, and lets you override any day with one tap.
Next AlarmA-Day
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First Bell
In 8 min
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U.S. public school teachers
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A/B+
Block, rotating & traditional schedules
Built for the way you teach
Three features no other alarm app gets right.
Generic alarms can't tell Monday from Tuesday. ScheduleLock knows your rotation, respects your weekends, and resets itself every morning.
Off when you need off
Snow day? Late start? Half day? One tap silences a full day or shifts a single alarm. Resets itself by tomorrow — so you can't forget to flip it back.
Survives reboots and DND
Built on AlarmManager, not background timers. Bypasses Do Not Disturb. Lives through phone restarts. Fires when it's supposed to — every time.
How it works
Three steps, then it runs itself.
01
Configure
Tell it your rotation
Pick A/B block or traditional. Set your start date and term dates. Three fields, under a minute. ScheduleLock figures out the rest of the year.
02
Build
Build your alarm groups
Create A-day alarms, B-day alarms, every-day alarms. Custom times, custom labels, weekly cadence options when you need them.
03
Override
Override when life happens
One tap for a full day off. Individual alarm toggles for late-start days. Auto-resets tomorrow — no remembering to undo anything.
Why not a regular alarm app
Generic alarms don't know it's Tuesday.
You shouldn't have to think about your alarm settings every Sunday night.
Feature
ScheduleLock
Generic alarm app
Tracks A/B & multi-day rotations
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Honors term & weekend dates
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One-tap day-off override
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Auto-resets the next day
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Works offline, no account
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Fires reliably after reboot
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Ready when you are
Stop second-guessing your alarm at 10pm on Sunday.
ScheduleLock is coming to the App Store and Google Play. Free, no account, 100% offline.
Coming soon to theApp StoreComing soon to theGoogle Play