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alarm app
(lemmy.ml)
F-Droid is an installable catalogue of FOSS (Free and Open Source Software) applications for the Android platform. The client makes it easy to browse, install, and keep track of updates on your device.
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Have you tried using Tasker to schedule QRalarm for you?
What is tasker?
https://tasker.joaoapps.com/
it's an android app that lets you automate almost anything on your phone/android system. downsides are it's a pay app, not foss, and fairly complicated to set up at first. upsides are it is almost unlimited with what you can automate. looks like there is a free trial. might be a lemmy-instance for it, (there's a reddit sub) disclaimer; i haven't used it for a while now on older android releases.