MyCircadianApp vs Project Function
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
MyCircadianApp
Optimize your health by tracking sunlight exposure, UV index, and vitamin D synthesis. Log sun sessions, monitor light levels, and receive personalized guidance based on your skin type, weather, and location. Enhance well-being and boost mood by syncing with natural light cycles.
- Sunlight exposure tracking
- UV index monitoring
- Vitamin D synthesis tracking
- Circadian rhythm monitoring
- Personalized guidance
- Sunrise/sunset compass
- Lux meter
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MyCircadian helps you optimize your health by tracking sunlight exposure, UV index, vitamin D synthesis, and circadian rhythms. Log sun sessions, monitor light levels, and get personalized guidance based on your skin type, weather, and location. The app features a compass for sunrise/sunset directions and a lux meter to monitor light quality. Sync with natural light cycles to enhance your well-being, boost your mood, and support healthy vitamin D production. Perfect for anyone looking to balance modern life with natural rhythms. Terms of Use: https://mycircadianapp.com/terms-of-use
Project Function
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With the Project Function App, you can check in to our facility, manage your membership details, and book appointments. - Access digital membership pass - Book appointments and view session balance - Edit personal information and view membership details - Stay up-to-date with announcements from us! Download the app today! Features connectivity to Apple Watch (synced to HealthKit app)
Screenshots
Verdict
The clearest difference is in-app purchases: Project Function at none against MyCircadianApp's 7. On price, update cadence, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. MyCircadianApp sells 7 in-app purchases, starting at $3.99 per month. Project Function asks for nothing beyond the download.
MyCircadianApp ships an update every 4 weeks, Project Function every 6 weeks. The most recent releases landed on August 29, 2026 and September 22, 2026 respectively.
| Parameter | MyCircadianApp | Project Function |
|---|---|---|
| Price | Free | Free |
| Rating | 4.9 (264 ratings) — better | — |
| Positive reviews | 98.6% of reviews | — |
| Number of ratings | 264 — better | — |
| Update frequency | Every 4 weeks — better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod, Apple Watch — better |
| Requires iOS | 15.1 — better | 15.5 |
| Further details — not scored | ||
| Size | 56 MB | 181 MB |
| Age rating | 12+ | 4+ |
| Developer | Sarah Kleiner Wellness | Project Function LLC |
Bugs and requests
MyCircadianApp
Reported bugs
2 issues- Login screen freezes
- Incompatibility with older devices
Requested features
2 requests- Ability to manually log sun sessions and vitamin D sources
- Option to view upcoming day's sunrise/sunset times
Project Function
Not enough reviews yet to summarise bugs or requests.
In-app purchases
MyCircadianApp
- Monthly7 Days trial$3.991 Month
- Monthly1 Month trial$3.991 Month
- Yearly1 Month trial$36.001 Year
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- Yearly7 Days trial$36.001 Year
- Lifetime$99.00
- Lifetime$179.00
- Lifetime$199.00
Project Function
No in-app purchases
Questions
Is MyCircadianApp free?
Is Project Function free?
Do MyCircadianApp or Project Function have ads?
Which is updated more often, MyCircadianApp or Project Function?
Other comparisons
