There are downsides with downloading their app just to input bad data, but it's a fun thought.
edit: While we're at it we might as well offer an alternative app to people.
I posted in !opensource@programming.dev to collect recommendations for better apps
The post: https://lemmy.ca/post/32877620
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
Write it down on paper or put it in a word document or excel spreadsheet (or FOSS equivalent if you don't have Office 365).
From a medical perspective, a handwritten journal with dates and notes about the amount/consistency of the flow as well as associated symptoms would be the most useful. Having irregular periods that last for 3 days with very heavy bleeding would have a very different diagnostic approach than irregular periods that last 3 to 5 days with normal bleeding and horrible cramps.