# 75 Medium Challenge vs Proof

The clearest difference is update cadence: Proof at every 2 weeks against 75 Medium Challenge's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 75 Medium Challenge sells 2 in-app purchases, starting at $9.99 per year and Proof sells 1 in-app purchase, starting at $14.99 per month. Whichever you choose, the download price is not the number that matters.

75 Medium Challenge ships an update every 8 months, Proof every 2 weeks. The most recent releases landed on November 3, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 75 Medium Challenge | Proof |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.9 (48 ratings)](https://appshunter.io/ios/app/75-medium-challenge-75-days/id6466105793/reviews)** | — |
| Number of ratings | **48** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | — |
| Size | 132 MB | 4 MB |
| Requires iOS | **16.4** | 17.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Contractor Pro Software LLC](https://appshunter.io/developer/1615065297) | [Devin Tripp](https://appshunter.io/developer/1494964580) |

## What reviewers say

### 75 Medium Challenge

[App page](https://appshunter.io/ios/app/75-medium-challenge-75-days/id6466105793)

This app guides users through a 75-day fitness and wellness program. It encourages daily workouts, reading, hydration, and healthy eating with progress tracking and personalized insights.

**Highlights:** Daily 45-minute workouts, 10 pages of daily reading, Minimum 3 liters of daily hydration, Healthy meal suggestions, Progress tracking, Personalized insights

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 75 Medium Pro | $9.99 | per year |
| Unlocks All Features | $6.99 | one-time |


### Proof

[App page](https://appshunter.io/ios/app/proof-ai-habit-tracker/id6798916057)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Proof Pro | $14.99 | per month |


## Frequently asked questions

### Is 75 Medium Challenge free?

75 Medium Challenge is free to download, with in-app purchases available.

### Is Proof free?

Proof is free to download, with in-app purchases available.

### Do 75 Medium Challenge or Proof have ads?

Neither 75 Medium Challenge nor Proof shows ads.

### Which is updated more often, 75 Medium Challenge or Proof?

75 Medium Challenge ships an update every 8 months, and Proof every 2 weeks. Most recently, 75 Medium Challenge was updated on November 3, 2026 and Proof on October 31, 2026.

---

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