# OPOS1 vs Rhythm SCD

The clearest difference is update cadence: Rhythm SCD at every 8 days against OPOS1's every 11 months. OPOS1's advantage is device support (3 vs 1) and iOS requirement (12.5.4 vs 18.0). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 5.0 for OPOS1 against 5.0 for Rhythm SCD. Both are backed by a comparable volume of ratings — 1 and 2 respectively.

OPOS1 ships an update every 11 months, Rhythm SCD every 8 days. The most recent releases landed on September 9, 2026 and July 23, 2026 respectively.

## The numbers

| Metric | OPOS1 | Rhythm SCD |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/opos1/id1591926408/reviews) | [5.0 (2 ratings)](https://appshunter.io/ios/app/rhythm-scd/id6758486418/reviews) |
| Number of ratings | 1 | **2** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 8 days** |
| Monetization | Free | Free |
| Size | 28 MB | 28 MB |
| Requires iOS | **12.5.4** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Simbex LLC](https://appshunter.io/developer/1552202788) | [Expressive Painimation Co.](https://appshunter.io/developer/1708598390) |

## What reviewers say

### OPOS1

[App page](https://appshunter.io/ios/app/opos1/id1591926408)

This app facilitates remote monitoring of compliance data for orthotic and prosthetic patients. It connects clinicians and patients, allowing for easy viewing and management of sensor activity and individual results.

**Highlights:** Remote compliance data monitoring, User-friendly platform, Clinician and patient access, Sensor activity configuration, Individual sensor results viewing, Data upload capability

**Features:** macOS Compatibility

**In-app purchases:** none


### Rhythm SCD

[App page](https://appshunter.io/ios/app/rhythm-scd/id6758486418)

This app assists individuals with sickle cell disease and their support network in tracking symptoms like pain, fatigue, and mood. It integrates with Apple HealthKit to collect vital health data, aiding in self-management and potentially contributing to research.

**Highlights:** Symptom tracking for sickle cell disease, Pain, mood, and fatigue monitoring, Apple HealthKit integration, Health data collection, Self-management tools, Secure and compliant data handling

**In-app purchases:** none


## Frequently asked questions

### Is OPOS1 free?

OPOS1 is free to download, with no in-app purchases.

### Is Rhythm SCD free?

Rhythm SCD is free to download, with no in-app purchases.

### Which has better reviews, OPOS1 or Rhythm SCD?

OPOS1 and Rhythm SCD are both rated 5.0 out of 5 on the App Store, from 1 and 2 ratings respectively.

### Do OPOS1 or Rhythm SCD have ads?

Neither OPOS1 nor Rhythm SCD shows ads.

### Which is updated more often, OPOS1 or Rhythm SCD?

OPOS1 ships an update every 11 months, and Rhythm SCD every 8 days. Most recently, OPOS1 was updated on September 9, 2026 and Rhythm SCD on July 23, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*