DELTA55 vs Stark Ring
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DELTA55
Read full descriptionHide full description
With the DELTA55 app interacting with your fitness club on your mobile device has never been easier. Manage everything from your class bookings to your membership details for a full club experience. Download the app to: - Enter your club using QR codes - Book classes with your favorite club - Get club details such as opening hours, location, etc. - Invite friends to join your club - Monitor club and class attendance history - Preview your membership details - Receive class reminders
Stark Ring
Read full descriptionHide full description
• Redesigned Home, Pulse, Activity, and Sleep tabs • Clearer health metrics and sleep timeline • Smoother tab navigation • Bug fixes and stability improvements
Screenshots
Verdict
The clearest difference is device support: Stark Ring at 3 against DELTA55's 1. On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
DELTA55 ships an update every 2 months, Stark Ring every 3 months. The most recent releases landed on October 10, 2026 and September 28, 2026 respectively.
| Parameter | DELTA55 | Stark Ring |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months — better | Every 3 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.6 | 15.1 — better |
| Further details — not scored | ||
| Size | 103 MB | 102 MB |
| Age rating | 4+ | 4+ |
| Developer | Perfect Gym Solutions Sp. z o.o. | Dien Nha Huyen |
In-app purchases
DELTA55
No in-app purchases
Stark Ring
No in-app purchases
