S vs ZenRing
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
S
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The S-Matic 2.0 app enables a comfortable and customized setting of the S-Matic 2.0 mattress. The app on your smart phone or tablet is simply connected to the mattress via Bluetooth. Once connected you can either choose from predefined settings or adjust the firmness level yourself whereafter this setting can be saved as your favorite. S-Matic 2.0 will support you with an optimal sleep experience.
ZenRing
Manage your wearable devices and track your sports health data, including steps, calories, sleep, and workouts. It provides a readiness score based on your recovery, activity, and sleep patterns to help you adjust your training.
- Device binding management
- Health data recording (steps, calories, sleep)
- Readiness score calculation
- Workout data display
- Day, month, and year data viewing
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ZenRing is an App for wearable device management and sports health data recording, with the following specific functions: 1. Device management It provides functions such as device binding management for convenient management of wearable devices. 2. Health data records Record and display your steps, calories burned, active distance, sleep and other data, and support day, month, and year viewing. 3. Readiness score Readiness is a holistic picture of your recovery, taking into account your recent activity and sleep patterns. 4. Workout data recording Record and display your exercise data. We're always going to bring you the best software experience, and we look forward to hearing from you! IMPORTANT: ZenRing only displays and analyzes data such as sleep and workout for users to help them adjust their body workouts. Seek the advice of a doctor before using this app and making any medical decisions.
Screenshots
Verdict
The clearest difference is update cadence: ZenRing at fortnightly against S's every 8 months. On price, ads, in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
S ships an update every 8 months, ZenRing fortnightly. The most recent releases landed on October 20, 2026 and October 24, 2026 respectively.
| Parameter | S | ZenRing |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | — | 3 — better |
| Update frequency | Every 8 months | Fortnightly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 14 MB | 66 MB |
| Age rating | 4+ | 17+ |
| Developer | Starsprings AB | KMAC Consulting LLC |
In-app purchases
S
No in-app purchases
ZenRing
No in-app purchases
