There are downsides with downloading their app just to input bad data, but it's a fun thought.
I posted in !opensource@programming.dev to collect recommendations for better apps
The post: https://lemmy.ca/post/32877620
edit, while we're at it we might as well offer an alternative app to people
Leading Recommendation from the comments
The leading recommendation seems to be Drip (bloodyhealth.gitlab.io)
Summarizing what people shared:
- accessible: it is on F-droid, Google Play, & iOS App Store
- does not allow any third-party tracking
- the project got support from "PrototypeFund & Germany's Federal Ministry of Education and Research, the Superrr Lab and Mozilla"
- Listed features:
- "Your data, your choice: Everything you enter stays on your device"
- "Not another cute, pink app: drip is designed with gender inclusivity in mind."
- "Your body is not a black box: drip is transparent in its calculations and encourages you to think for yourself."
- "Track what you like: Just your period, or detect your fertility using the symptothermal method."
Their Mastodon: https://mastodon.social/@dripapp
A potentially good option if you're on Android is putting it in your secure folder. It's basically just a sub directory for all your files, notes, and pictures, but it an encrypted form.
So if you're technical enough to understand jow to enter a password (most people), then you have an easy to use option. Just don't forget your password, and don't set it to something easy to crack. It's the same rules for any other password.
I'm sure there are similar options for windows/mac/ios
But if you're a more technical user, by all means it is in your interest to encrypt the whole thing.