45
BU Score
Emerging
DaysyDay - Zykluskalender
✍️ BU Analytics Review
“
DaysyDay - Zykluskalender is an iOS app from Valley Electronics in the Education category, currently rated 3.5★ across 102 ratings. Initial signal reads as mostly critical sentiment so far — users flag rough edges and unmet expectations.
Our BU Score puts it at 45 — Emerging (early traction worth watching). For a Education app, that means early traction worth watching.
Track changes month-over-month in the Performance section below — live snapshot history and revenue forecast included.
creator
📊 Performance Tracking LIVE
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Rating
—
Reviews
—
Forecast Revenue / mo
—
Snapshots tracked
0
since first record
Range:
💰 Forecast Revenue / mo
MODELRevenue forecast computed from BU's 234 trigger model on each snapshot. Calibrated against ground-truth from 58 verified-revenue apps.
🔬Forecast Breakdown — Why This Estimate?Top 8 of 8 triggers
Our ML model uses 200+ signals from public data. These are the most influential for this app:
| Below-average rating (3.5★)METRIC | −$1,500 | |
| highly recommendREVIEW | +$1,400 | |
| slowREVIEW | −$1,200 | |
| priceyREVIEW | −$800 | |
| Established app (5y old)METRIC | +$800 | |
| Ad-supported / freemiumMETRIC | +$600 | |
| Localized (6 languages)METRIC | +$600 | |
| Early-stage install base (102 ratings)METRIC | +$400 |
METRIC = structural app data · REVIEW = mined from user reviews · ✓ VERIFIED = Stripe-verified anchor (TrustMRR)
📈 Reviews Growth
LIVECumulative review count from first BU snapshot. Each point = a tracked update.
💚Sentiment Over Time↑ green = positive · ↓ red = negative
Jul 24
Aug 24
Sep 24
Dec 24
Jan 25
Apr 25
Jul 25
Aug 25
Oct 25
Nov 25
Dec 25
⭐ Rating Trend
LIVEAverage rating evolution. Updates with each new review batch.
🗓️ Snapshot Timeline
HISTORYEach bar shows a tracked update and the metric delta from the previous snapshot.
App Specs
🔐 Own this app? Claim & verify MRR →💾 34 MB🔞 17+📱 iOS 12.0+🔖 v1.5.1🔄 updated 2y ago🌐 EN, FR, DE, IT, PT +1📂 Education💰 Free🚀 Launched 2020 (5y old)
📝 About this app
Winner of a Best of Swiss Apps 2021 Award, the companion app to the Daysy fertility tracker is designed with the feedback from our users and decades of experience in the fertility tracking market. Together, Daysy and DaysyDay provide you with the knowledge and tools needed to identify your fertile window and make informed and powerful choices about your menstrual cycle, fertility, and health.
KEY FEATURES:
Past, Present and Future
The easy-to-read calendar and an uncluttered temperature curve make it easy to view your fertility status, ovulation, and menstruation for the past, for today, and what is predicted in the coming month.
Identify Irregularities
The temperature curve and easy-to-read average and individual cycle statistics can help you easily identify cycle irregularities and provide insights on how current events affect your overall cycle.
Take Notes
Daily data cards let you easily track additional cycle features. Track cervical mucus, intercourse, and your own notes about your fertility and cycle.
Share Your Data
Invite your partner to download the DaysyDay Partner app and then choose which data can be shared and viewed.
Contact Our Expert Team
Use the Contact Support feature in the Help menu to easily reach out to our expert team if you need advice and support. Our team is here to help you every step of your fertility tracking journey.
KEY FEATURES:
Past, Present and Future
The easy-to-read calendar and an uncluttered temperature curve make it easy to view your fertility status, ovulation, and menstruation for the past, for today, and what is predicted in the coming month.
Identify Irregularities
The temperature curve and easy-to-read average and individual cycle statistics can help you easily identify cycle irregularities and provide insights on how current events affect your overall cycle.
Take Notes
Daily data cards let you easily track additional cycle features. Track cervical mucus, intercourse, and your own notes about your fertility and cycle.
Share Your Data
Invite your partner to download the DaysyDay Partner app and then choose which data can be shared and viewed.
Contact Our Expert Team
Use the Contact Support feature in the Help menu to easily reach out to our expert team if you need advice and support. Our team is here to help you every step of your fertility tracking journey.
🆕 What's New · v1.5.1
Thanks for using DaysyDay!
In this version:
- Updated display of the daily data in the weekly view
- Chart includes a new data matrix displaying menstrual flow, intercourse, and mucus (An initial step to expand tracking features)
- A link to explanations of the cervical mucus types added to the Mucus card
- Visit the settings menu for a direct link to rate the app (Ratings are greatly appreciated!)
- A few additional bug fixes and stability improvements to enhance your experience.
Have questions or suggestions? Send us a message in the app (Settings -> Help -> Contact support). We are constantly working to add new features and improve your overall app experience.
In this version:
- Updated display of the daily data in the weekly view
- Chart includes a new data matrix displaying menstrual flow, intercourse, and mucus (An initial step to expand tracking features)
- A link to explanations of the cervical mucus types added to the Mucus card
- Visit the settings menu for a direct link to rate the app (Ratings are greatly appreciated!)
- A few additional bug fixes and stability improvements to enhance your experience.
Have questions or suggestions? Send us a message in the app (Settings -> Help -> Contact support). We are constantly working to add new features and improve your overall app experience.
Profile & Insights
Everything we know — and don't — about this app and its company.
Identification
- App name
- DaysyDay - Zykluskalender
- Developer
- Valley Electronics
- Bundle ID
- ch.valleyelectronics.daysyday
- App Store URL
- Open in App Store
- Category
- Education
- Content rating
- 17+
- Languages
- EN, FR, DE, IT, PT, ES
Company
- Website
- Not found
- Tagline
- Today
- Description
- Find apps and games for iPhone, iPad, Mac, and more on the App Store.
- Founded
- Not found
- HQ / Address
- Not found
- Employees
- Not found
- Logo
- OG image
Revenue
- Verified revenue / mo
- Not found
- AI revenue estimate / mo
- Not found
- AI annual estimate
- Not found
- ML model estimate / mo
- $261/mo
- Top-grossing rank
- Outside top 100 in US Education
- All-time revenue
- Not found
- Pricing
- Not found
Founder
- Name
- Not found
- X / Twitter
- Not found
- Not found
- GitHub
- Not found
- X followers
- Not found
- Public statements
- Not found
Funding
- Total raised
- Not found
- Last round
- Not found
- Investors
- Not found
- Crunchbase
- Not found
- AngelList
- Not found
Press & Links
- Articles found
- Not found
- Listed on
- Not found
- Blog
- https://apps.apple.com/us/app/letterloop-group-newsletters/id6468623700
- Press / News
- Not found
Contacts & Socials
- Socials
- Not found
- Not found
- Phone
- Not found
- Contact page
- Not found
- About page
- https://apps.apple.com/us/iphone/story/id1603519753
📈Ratings growth102 ratings+10100% lifetimeShow 3-year history estimate ▾
Tracked (54 weeks) Pre-tracking estimate (35 weeks) · model-based, ±5% noise · anchored to release date and current value
🌍Geographic ReachNot ranked
This app is currently outside the top 100 grossing in all 9 countries we monitor (US, UK, DE, FR, JP, CA, AU, BR, IN). Niche or new apps often launch this way — popularity rankings appear once daily revenue clears the regional threshold.
Profile is built from iTunes Lookup + developer site scrape + ML revenue model. Empty fields show "Not found" — additional sources (Crunchbase, X, IndieHackers, Acquire.com) coming.
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