Verithiathe honest score on any app
Updated July 2026 · real, multi-region App Store reviews
Head-to-head

Clue Period & Cycle Tracker vs Stardust Period Tracker

Clue Period & Cycle Tracker 4.8★ · Free + IAP 75
Winner Clue Period & Cycle Tracker
Stardust Period Tracker 4.8★ · Free + IAP 60

For reliable period tracking with a focus on data privacy and a more traditional interface, Clue is the better choice, despite its aggressive premium upgrade prompts.

Full reviews: Clue Period & Cycle Tracker · Stardust Period Tracker

Clue Period & Cycle Tracker and Stardust Period Tracker both offer free versions with in-app purchases, but recent reviews highlight significant frustration with constant subscription pop-ups in Clue and performance issues and data loss in Stardust. While Clue is praised for its accuracy and ease of use over many years, Stardust stands out for its unique aesthetic and community features, though it struggles with reliability and a strong astrology focus.

Head to head

Features & Functionality edge: Clue Period & Cycle TrackerR5R8R12R23
Clue Period & Cycle Tracker Clue is praised for its comprehensive tracking options, including emotions and various symptoms, and its accuracy in predicting cycles, even for irregular periods R5R23R38R41. Users appreciate the scientific insights and articles provided R8. However, some advanced tracking features, like IUD tracking or specific exercise categories, are noted as lacking or limited even for paid users R12.
Stardust Period Tracker Stardust offers unique features like horoscopes, tarot cards, and a partner sharing option, appealing to users who enjoy a 'witchy' or 'zodiac' aesthetic . It provides versatile symptom options and insightful information about the body . However, several users report issues with inaccurate tracking, especially for irregular cycles, and a lack of adjustment based on entered data . Some features are also criticized for being overly astrology-based with no option to turn it off .
Ease of Use & Interface tieR1R3R4R5
Clue Period & Cycle Tracker Clue is consistently described as easy to navigate and use, even for new users R5. Its interface is clear and straightforward R5. However, the user experience is severely hampered by constant, full-screen pop-ups for premium subscriptions, making quick data entry frustrating and time-consuming R1R3R4R6.
Stardust Period Tracker Stardust is praised for its visually appealing and unique design . However, many users report significant issues with the app being slow, laggy, and prone to freezing R79. There are also complaints about login problems, data transfer difficulties, and random data deletion R64R73R76.
Reliability & Performance edge: Clue Period & Cycle TrackerR2R5R13R38
Clue Period & Cycle Tracker Many long-term users attest to Clue's reliability and accuracy in predicting periods over several years R2R5R38R41. However, some recent reviews mention lagging issues and connection problems R13. One user reported that the app did not use verified ovulation data to adjust predictions, relying instead on algorithms R46.
Stardust Period Tracker Stardust faces significant criticism for its reliability. Users report frequent glitches, the app stopping working, and general slowness . A major concern is the random deletion of user data, which is highly problematic for a tracking app R76. Inaccurate cycle predictions are also a common complaint, with the app failing to adjust for irregular cycles or displaying incorrect phase lengths .
Price & Value tieR1R3R4R6
Clue Period & Cycle Tracker Clue offers a free version with core tracking features, which many users find sufficient R8. The paid version is described as affordable R8. However, the value of the free version is significantly diminished by incessant, full-screen pop-ups and ads pushing the premium subscription, leading many users to feel harassed and consider deleting the app R1R3R4R6. Some features previously free, like Clue Connect, are now behind a paywall .
Stardust Period Tracker Stardust also offers a free version but locks many 'special' or 'unique' features behind a paywall . Users feel that the free version is too limited and that the app is 'greedy' . Some users reported being charged for subscriptions they cancelled or not receiving access to paid features after payment . The yearly price is considered worthwhile by some , but others find it too expensive for basic tracking .
Support & Privacy edge: Clue Period & Cycle TrackerR8R22R28R58
Clue Period & Cycle Tracker Clue is praised for its commitment to data privacy R8R28. However, customer support for billing issues seems problematic, with reports of wrong charges and unhelpful chatbots R22. The app's response to user feedback about pop-ups has been perceived as dismissive R58.
Stardust Period Tracker Stardust users report issues with customer support regarding billing discrepancies and difficulty unsubscribing . There are also concerns about the app's performance impacting battery life and potential data mining R79R97. The app's sign-up process is limited, primarily to Apple ID, which is a barrier for some users R64.
Pick Clue Period & Cycle Tracker if

You prioritize long-term accuracy, a science-based approach, and data privacy, and are willing to tolerate frequent pop-ups for premium features in the free version R2R5R8R38.

Pick Stardust Period Tracker if

You are drawn to a unique, aesthetically pleasing app with astrology-based insights and community features, and are prepared to deal with potential performance issues, data glitches, and a limited free experience .

Evidence note: Both apps have a free tier with IAP, and much of the negative feedback for both revolves around the push to upgrade to premium. Clue's negative reviews are heavily skewed towards the incessant pop-ups for its paid subscription, while Stardust's negative reviews focus more on technical issues, data loss, and the perceived greediness of its paywall.

Frequently asked

Which app is better for accurate period predictions?
Clue Period & Cycle Tracker has a stronger track record for accuracy and reliability over many years, with users consistently praising its ability to predict cycles, even irregular ones R2R5R38R41. Stardust Period Tracker, while aiming for accuracy, has received multiple complaints about miscalculations and failure to adjust for irregular cycles .
Do these apps have free versions?
Both Clue Period & Cycle Tracker and Stardust Period Tracker offer free versions, but users report that the free experience is significantly impacted by aggressive attempts to upsell to a paid subscription R1R6R9. In Clue, this manifests as constant, full-screen pop-ups R4R58, while in Stardust, many unique features are locked behind a paywall .
Which app has better data privacy?
Clue Period & Cycle Tracker explicitly states its commitment to data privacy, which is appreciated by its users R8R28. Stardust Period Tracker, while not directly criticized for privacy breaches, has users concerned about potential data mining due to its slowness and battery drain R79R97.
Are there issues with logging in or data loss?
Stardust Period Tracker has multiple reports of login issues, difficulties signing up (especially without an Apple ID), and concerning instances of entire user data being randomly deleted R64R73R76. Clue Period & Cycle Tracker does not have widespread reports of login issues or data loss, though one user mentioned problems with data not being used for predictions R46.

What reviewers actually said

Built only from these 120 real reviews (foreign ones translated). Superscripts jump to the quote here. Apple has no per-review links, so [ref] opens that app's reviews on the App Store.

  1. [R5] Clue Period & Cycle Tracker 5/5 · US I had this app for 5 years you won’t regret it: To start off I first got this app in 8th grade, I’m now a rising freshman in college and I absolutely LOVE this app, it’s so easy to navigate and navigate. There are option for every symptom or daily activity. I love how clear it is, as someone who has had irregular period for the last 3 years, this app never failed to at least be close to the predic
  2. [R8] Clue Period & Cycle Tracker 5/5 · US Affordable app with data privacy: I appreciate that Clue offers insight and articles for you to read and is very affordable when it comes to the paid version. But you still have a free version too! Plus the fact that they’re committed to keeping your data private.
  3. [R12] Clue Period & Cycle Tracker 3/5 · US Lackluster IUD Tracking: I have a paid subscription for Clue and use the Clue Tracking mode without a period because I don’t bleed so the Period Tracking mode doesn’t really work for me. Unfortunately, that means the Clue Connect and widget features are completely unavailable to me. As a paid user, I’d love to see features that support IUD users because even though I don’t bleed, I do have period
  4. [R23] Clue Period & Cycle Tracker 5/5 · US Amazing: This app is so good that I can also track my emotions
  5. [R1] Clue Period & Cycle Tracker 1/5 · US gone downhill: the app CONSTANTLY has pop-up screens trying to force you to buy a paid subscription. it’s infuriating to open an app for what should be a 30 second entry and have it take more than twice as long due these greedy tactics.
  6. [R3] Clue Period & Cycle Tracker 3/5 · US 5 stars until: this app is hands down easy TEN STARS but every.damn.time. i open the app i get a promo. that's nice and everything but it should only pop up once a week if you open the app frequently bc it's literally just too much. tapping out of several pop up ads for premium before i can look at my data, several times a day if i'm logging or checking during curtain windows is too excessive. tru
  7. [R4] Clue Period & Cycle Tracker 1/5 · US Ads to upgrade: Super annoying to get an ad pop up every second of using the app, an ad to upgrade to premium. Extremely excessive
  8. [R2] Clue Period & Cycle Tracker 5/5 · US So good and reliable: I have been using this app since I was 17 years old and now I am 25. It is really helpful.
  9. [R13] Clue Period & Cycle Tracker 2/5 · US It got worse: I've been using this app for so many years, but for the last six months, it's been terribly laggy and constantly loses connection. It doesn't work with or without a VPN. · translated
  10. [R38] Clue Period & Cycle Tracker 5/5 · US Best app, Don’t have to think about anything just open & know: Clue has somehow become the FBI agent assigned to my uterus. Me: “Why am I crying because my avocado was too ripe?” Clue: “Give it 48 hours.” …and then 48 hours later, there it is. Every. Single. Time. It predicts my mood swings better than I do, reminds me why I suddenly want chocolate and a nap, and saves my family from wondering
  11. [R6] Clue Period & Cycle Tracker 3/5 · US Helpful but frustrating: The tracking is very helpful in this app, however the constant pop ups for “90 percent off” are pretty annoying. If you’re not paying for the subscription the adds are incessant and it makes it more difficult to use the basic features.
  12. [R22] Clue Period & Cycle Tracker 1/5 · US Wrong Charges: They offered me 3usd clue plus and when I paid they charged me 43.99usd! No answer back. Only chatbot and a AI assistant which leads a “we didn’t find any purchase with your info” but definitely on my card is the charge.
  13. [R28] Clue Period & Cycle Tracker 1/5 · US Too many subscription ads: I used to like the free version of the app until I had to click past the subscription offers to even see my information. Why not just make it a banner instead of a full screen ad every single time? I appreciated the commitment to privacy but now I'm looking for a new tracker because it's getting ridiculous.
  14. [R58] Clue Period & Cycle Tracker 1/5 · US Literally untenable without subscription: I have seen other people mention this issue to clue in other reviews, and their response is basically 'suck it the eff up.' You literally cannot do ONE thing on this stupid app without a full page giant pop-up for clue plus. Everytime you open it, every time you log anything, giant ad. If it didn't take so long to transfer years of data to a new app, I wo
  15. [R41] Clue Period & Cycle Tracker 5/5 · US Accuracy improves with longer term use: I’ve had this app since 2017, for period tracking only (not for pregnancy) and have been a subscriber since 2022. This is the only app I’ve ever used and it stuck with me for a reason. The predictions get better the longer you log ur data. Sometimes it lets me know I’m getting my period on a given day and it can be spot on at times for me. Overall, this app
  16. [R9] Clue Period & Cycle Tracker 3/5 · US No I do not want to pay!: This is app is fine and easy to use. However don’t expect to track anything or press a single button without them asking you twice as many times as they need to for the “subscription” You’ll get asked almost every 10 seconds it feels like. Very very very annoying when I would just like to track my period. I don’t need all the bells and whistles yall are trying to suck ou
  17. [R79] Stardust Period Tracker 1/5 · US deleting asap anti ai: i was gonna give 3 stars bc the app kinda sucks but it’s made by women, i think it’s odd they advertise “found by women” instead of “women owned” or something clarifying a woman is still running the company or maybe you guys sold out to a bunch of billionaires 🤷‍♀️ the app would lower my phone battery at least 2% loading it on an iPhone 13 that doesn’t have power issues wit
  18. [R97] Stardust Period Tracker 1/5 · US sold out: used to love this app. they so obviously sold out and are mining data every time you use the app. it runs incredibly slow.
  19. [R46] Clue Period & Cycle Tracker 1/5 · US Garbage: I paid for the full access subscription. The app does not take into account verified information in its predictions. I confirmed ovulation every month with a test, entered the date into Clue, and the app will not use that information to adjust my predictions accordingly. When I asked why I was told the uses algorithms to predict, instead of real data. And getting a refund is like pullin
  20. [R64] Stardust Period Tracker 1/5 · US Only Apple sign in.: Can’t signup at at least on my device. Only asks for sign up and create account with only Apple info. That’s extremely unfortunate.
  21. [R73] Stardust Period Tracker 1/5 · US Log in doesn’t work: Logging in never works
  22. [R76] Stardust Period Tracker 1/5 · US Deleted data randomly: Been using this app for years, I love this app and has been very helpful in keeping track and logging symptoms. Until it randomly deleted all my data and prompted me to make a new account. My partner is still linked with my old account so im not sure how or why this happened but i just renewed my subscription in April 2026 and am very upset my data is gone.

Synthesized from 120 recent App Store reviews · updated July 2026 · View on the App Store