Your first periods, without the guesswork
Mark the day your period starts, note cramps or a rough day, and the app keeps count. Teen mode keeps it to what matters at 13 to 17, with nothing for sale.
Periods usually start around 12, and anywhere from 8 to 16 is within the normal range, according to the NHS. For the first year or two, cycles are often irregular.
Her Good Days works from 13. Teen mode tracks periods, cramps, mood and sleep, and switches off the shop, weight goals and anything about pregnancy.
What teen mode includes
Period start and end days, flow, cramps and PMS, mood, energy, sleep, water, a private journal, and short articles about periods and growing up.
The wellness shop and its banners, marketing email, weight-loss and calorie goals, pregnancy tracking, fertile-window days and anything that scores days as lower or higher chance.
Why write it down?
Early cycles jump around, so "when is my next one?" is hard to answer from memory. A few months of dates shows your usual gap, and the app gives a likely window for the next period so you can keep pads or a cup in your bag that week.
It also helps when something feels wrong. Saying "my last three periods lasted 9 days and I missed school twice for cramps" gives a doctor much more to go on.
Worth telling a doctor or school nurse
- no period by 16
- periods that last more than 7 days, or soak through a pad or tampon every hour or two
- cramps that painkillers from a pharmacy do not help
- periods that were regular and then stop
For parents and carers
The app asks for an age band, never a date of birth. Under 13 cannot sign up. Teen accounts see no products, no third-party ads and no marketing messages, and their health entries are never sold or shared for advertising. Your teen can start as a guest, which keeps everything on her phone.
Read the privacy policy or see how the app treats data.
Other life stages
The features for this stage
Questions
How old do you have to be to use Her Good Days?
13 or older. The app asks for an age band at the start, and anyone under 13 sees a stop screen.
What is different in teen mode?
Ages 13 to 17 get the cycle, cramps and PMS, mood and sleep tools, plus articles to read. There is no shop, no marketing email, no weight-loss or calorie goal, and no pregnancy or fertile-window features.
When do periods usually start?
The NHS says periods usually start around age 12, and anywhere from 8 to 16 can be normal.
Does it cost anything?
No. Every feature is free and there is nothing to subscribe to.
Start with today
Her Good Days is free, with no third-party ads and nothing to subscribe to. Free on iPhone and Android.