DO NOT USE STARDUST
Stardust is being listed as a safe period/fertility tracker IT IS NOT.
End to end encryption is great in the moment you are inputting data, but the data is still stored on a database with Stardust. This means the government can show up and request the data.
"but, the data is encrypted in the database!"
Okay, but who has the decryption ability? Stardust. Who can the government get it from if they get the warrent? Stardust.
Not only that, but Stardust claims an "encryption wall". This doesn't exist, it's not a real term. The cyber security teams who have built modern encryptions don't even know what this is supposed to mean and that is HIGHLY SUSPECT AND MISLEADING.
Stardust is marketed to sound great unless you know cyber security and how computers work.
Many people in the information security field are trying to raise awareness. Feel free to look into this thread with Kenn White, a HUGE cryptography and encryption name, and other cyber security people, essentially saying if data is stored off the device, E2EE (end to end encryption) is useless. (They tend to use acronyms, so Google is your friend)
ALTERNATIVE PERIOD TRACKERS?
Drip:
An Open-Source Cycle-Tracking App
Yes, awful name, but Drip is built so the creators never have your data, only your phone has your data.
The code is open source, which means you can look at all the code yourself through the gitlab link. It means this is just code you can use on your phone, NOT a company storing data or making money. It is made to let you track safely. This is their privacy policy
You can even lock the app so it can be double password protected.
Why does this work instead of Stardust? Drip never had your data. If the government gets a warrent to collect your data from Drip, drip has nothing on you.
At the moment Drip (since it is so new in response to Roe v Wade), is only on Android BUT has a notification sign up as they plan to release on Apple soon. PLEASE take a look, it is on the app store as well.
TLDR:
Stardust is not a safe period tracker.
Drip is a safer alternative.
