Step 1
Note your period dates
Write down your last few period start dates from Stardust.
Stardust vs Her Good Days
Her Good Days vs Stardust
Stardust pairs your cycle with the moon and your star sign, and lets friends follow along. Her Good Days skips the astrology and goes deep on symptoms.
- Checked October 30, 2026
- Every Stardust fact linked to its source
Comparing more apps? See period tracker apps, compared or Stardust alternatives.
| At a glance | Stardust | Her Good Days |
|---|---|---|
| Price | Free tier; $6.99 a month or $29.99 a year (App Store) | Free. No paid tier |
| Extras | Moon calendar, zodiac insights, daily card readings, sharing with friends | Menopause, pregnancy, sleep, food, workouts and a doctor report |
| Privacy | Says it never sells or shares personal health information; label lists 3 data types used to track you | Private mode: no account, nothing leaves the phone |
| Menopause | Not in the listing | Hot flashes by week, sleep next to night sweats, a doctor report |
| Verdict | Fits if you enjoy astrology and want to sync cycles with friends | The pick if you want health tracking with nothing to pay |
Where Her Good Days is different
Tracking for what's happening in your body
Stardust's listing leads with lunar phases, zodiac insights and daily card readings tuned to your sign and cycle phase (App Store).
Her Good Days has no astrology. It tracks symptoms with how strong they were and when, follows you into perimenopause and menopause, and turns it all into a report for your doctor.
Feature by feature
Stardust vs Her Good Days, side by side
| Stardust | Her Good Days | |
|---|---|---|
| Price | Free tier; $6.99 a month or $29.99 a year among its in-app purchases (App Store) | Free. No paid tier |
| Periods | Yes | Period start and flow; your next period shown as a range |
| Fertile days | Fertility and trying-to-conceive tracking | Estimated fertile days, labeled "Not birth control"; never in teen mode |
| Perimenopause and menopause | Not in the listing | Hot flashes per week and the hours they cluster in, sleep next to night sweats, cycle gaps over 60 days |
| Pregnancy | Pregnancy mode, week by week | Week and due date, appointments with your questions, kick counter, contraction timer, a baby card each week |
| After birth | Postpartum mode | Bleeding per day, pelvic floor, feeding if you want it, sleep in blocks |
| Report for your doctor | Not stated in the listing | A PDF for the dates you pick: periods, cycle lengths, each symptom with how often and how strong, sleep, medications, your notes |
| Teens | Rated 13+ | From 13. Teen mode has no shop, no weight-loss goals and no fertile days |
| Use without an account | Not stated in the listing | Private mode: no account, and nothing leaves the phone |
| Ads and tracking | Label: purchases, identifiers and usage data used to track you; health data listed as not linked to you | No outside analytics code |
| Community | Invite partners or friends to follow your cycle | No forums or chat |
| Platforms | iPhone, Android | iPhone and Android |
How we source this. Stardust cells come from the US App Store listing and Google Play, checked October 30, 2026, and TechCrunch for 2022. Stardust is a trademark of its owner; Her Good Days isn't affiliated with it.
Pricing
Stardust pricing vs Her Good Days
US App Store in-app purchases on October 30, 2026; the listing doesn't say which features each plan adds.
Her Good Days
Free, every feature
| Every feature | $0 |
| Paid tier | None |
| Trial | Nothing to cancel |
Stardust
Free tier, then a plan
| Free | Cycle tracking |
| Monthly | $6.99 |
| Annual | $29.99, or $24.99 to $39.99 with a trial |
| All Access | $2.99 to $24.99 |
Privacy
Is Stardust safe?
Stardust's listing says: "We never sell or share your personal health information." Its App Store label lists health data as not linked to you, and purchases, identifiers and usage data as used to track you across other companies' apps (App Store).
In 2022 TechCrunch reported that Stardust removed an end-to-end encryption claim from its privacy policy after TechCrunch asked about it (TechCrunch).
On Google Play, Stardust says no data is shared with third parties and that you can ask for your data to be deleted (Google Play).
Which one to pick
| Pick Her Good Days if | Stardust fits if |
|---|---|
| You enjoy the moon and your chart. |
How to switch from Stardust
Step 2
Start Her Good Days
Pick your stage and enter your last period. Private mode keeps it on the phone.
Step 3
Tell your friends
If you shared your cycle in Stardust, let them know you've moved, then delete your Stardust account there.
Other comparisons
Questions
Is Stardust safe?
Stardust says it never sells or shares personal health information, and its label keeps health data unlinked from you. It also lists 3 data types used to track you, and it withdrew an encryption claim in 2022.
Is Stardust free?
There's a free tier. Paid plans include $6.99 a month or $29.99 a year on the US App Store.
Stardust or Flo?
Flo has more health tools and fertility depth; Stardust has the astrology and the friend sharing. Her Good Days is free and focuses on symptoms, menopause and a doctor report.