Muscel vs Proof
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Muscel
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.
- Predict future lifting progress
- Analyze real workout data
- Set personalized goals
- Track workouts
- Follow data-driven targets
- Visualize strength progression
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Muscel helps you train with personalized routines, smarter goals, and clear progress tracking. Generate an AI powered workout plan based on your goal, schedule, experience, available equipment, and training preferences. Follow weekly or two week routines that rotate automatically, or customize your plan by swapping exercises, duplicating sets, and deleting sets to fit your needs. Log routine workouts or independent lifts, then see conservative, realistic, and reach goals built from your workout history. Track your consistency, completed sessions, workout history, and growth over time. Visualize your progress and compare your level against lifter standards for your age and weight class. Muscel is designed to help you train with structure, adapt your plan, and understand where your strength is heading.
Proof
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.
- 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
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Proof is a lifting log for people who want a record, not a coach. Most fitness apps tell you what to do. Proof measures what you did, every set, and shows you whether you beat last time. WHAT IT DOES - Log a set in two taps. Weight, reps, done. - Every lift keeps its full history. Nothing is capped or hidden. - Personal records are detected automatically and sealed the moment you hit them. - A body map shows which muscles you have trained hard and which you have skipped. - Patterns surface the honest stuff: your best day, your steadiest day, where you stall. - A rest timer that runs in the Dynamic Island and on the Lock Screen. WHAT IT DOES NOT DO - No subscription. Pay once, keep it forever. - No account. Nothing to sign up for. - No cloud. Your training stays on your phone. - No ads, no feed, no streak guilt. FREE AND PAID Log as much as you want for free, and the last 30 days are always open. A one-time unlock opens your full history, the body map over time, and every record back to day one. Built by one person who lifts and wanted an honest instrument, not another coach. Log your lifts. Beat last time.
Screenshots
Verdict
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.
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. 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.
| Parameter | Muscel | Proof |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) | 5.0 (4 ratings) |
| Positive reviews | — | 100.0% of reviews |
| Number of ratings | 4 | 4 |
| Update frequency | Every 8 days | Every 3 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPod, Apple Watch |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 144 MB | 25 MB |
| Age rating | 4+ | 4+ |
| Developer | Xichen Song | Serafin Vazquez |
Customer experience
Muscel
Proof
In-app purchases
Muscel
No in-app purchases
Proof
- Full Instrument$19.99









