# Muscel vs Proof

The clearest difference is in-app purchases: Muscel at none against Proof's 1. Proof's advantage is update cadence (every 3 days vs every 8 days). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Proof sells 1 one-off in-app purchase. Muscel asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Muscel against 5.0 for Proof. Both are backed by a comparable volume of ratings — 4 and 4 respectively.

Muscel ships an update every 8 days, Proof every 3 days. The most recent releases landed on October 11, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Muscel | Proof |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (4 ratings)](https://appshunter.io/ios/app/muscel-adaptive-workouts/id6762177875/reviews) | [5.0 (4 ratings)](https://appshunter.io/ios/app/proof-smarter-workout-tracker/id6777612827/reviews) |
| Number of ratings | 4 | 4 |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 3 days** |
| Monetization | Free | Free |
| Size | 144 MB | 25 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Xichen Song](https://appshunter.io/developer/1893248472) | [Serafin Vazquez](https://appshunter.io/developer/6777613189) |

## What reviewers say

### Muscel

[App page](https://appshunter.io/ios/app/muscel-adaptive-workouts/id6762177875)

This app analyzes your workout data to predict your future lifting progress. It sets personalized goals to help you improve faster by tracking your training and following data-driven targets.

**Highlights:** Predict future lifting progress, Analyze real workout data, Set personalized goals, Track workouts, Follow data-driven targets, Visualize strength progression

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

**In-app purchases:** none


### Proof

[App page](https://appshunter.io/ios/app/proof-smarter-workout-tracker/id6777612827)

This app is a straightforward training log designed to help you track your weightlifting progress. It focuses on recording your sets and reps, automatically loading previous session data to help you beat your personal bests. Your training data is stored locally on your device for privacy.

**Highlights:** Log lifts with pre-loaded previous weights and reps, One-tap set completion, Adjustable numbers with thumb scrubbing, Integrated rest timer, Weekly training summary, Consistency calendar and per-lift history, Local data storage for privacy

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Instrument | $19.99 | one-time |


## Frequently asked questions

### Is Muscel free?

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

### Is Proof free?

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

### Which has better reviews, Muscel or Proof?

Muscel and Proof are both rated 5.0 out of 5 on the App Store, from 4 and 4 ratings respectively.

### Do Muscel or Proof have ads?

Neither Muscel nor Proof shows ads.

### Which is updated more often, Muscel or Proof?

Muscel ships an update every 8 days, and Proof every 3 days. Most recently, Muscel was updated on October 11, 2026 and Proof on October 24, 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.*