# OPOS1 vs 75 hard challenge tracker+

The clearest difference is in-app purchases: OPOS1 at none against 75 hard challenge tracker+'s 1. 75 hard challenge tracker+'s advantage is update cadence (every 2 months vs every 21 months) and iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. 75 hard challenge tracker+ sells 1 in-app purchase, starting at $9.99 per month. OPOS1 asks for nothing beyond the download.

OPOS1 ships an update every 21 months, 75 hard challenge tracker+ every 2 months. The most recent releases landed on October 12, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | OPOS1 | 75 hard challenge tracker+ |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/opos1/id1591926408/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 21 months | **Every 2 months** |
| Monetization | Free | — |
| Size | 28 MB | 81 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [simbex](https://appshunter.io/developer/1552202788) | [Ali Faizan Mehmood](https://appshunter.io/developer/1858493000) |

## 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, Vision Pro support

**In-app purchases:** none


### 75 hard challenge tracker+

[App page](https://appshunter.io/ios/app/75-hard-challenge-tracker-plus/id6785412994)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Go Premium | $9.99 | per month |


## Frequently asked questions

### Is OPOS1 free?

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

### Is 75 hard challenge tracker+ free?

75 hard challenge tracker+ is free to download, with in-app purchases available.

### Do OPOS1 or 75 hard challenge tracker+ have ads?

Neither OPOS1 nor 75 hard challenge tracker+ shows ads.

### Which is updated more often, OPOS1 or 75 hard challenge tracker+?

OPOS1 ships an update every 21 months, and 75 hard challenge tracker+ every 2 months. Most recently, OPOS1 was updated on October 12, 2026 and 75 hard challenge tracker+ on October 7, 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.*