IF Strength vs Proof
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
IF Strength
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IF Strenght is the fitness tracker app for the serious guy or gal that wants to take his/hers fitness results to the next level. The app contains: - The ability to track a live workout - Switch exercises during workouts - Reorder exercises during workouts - +35 unique exercises to select from - History view of your workouts And many more awesome features are being developed and launched soon.
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: IF Strength at none against Proof's 1. Proof's advantage is update cadence (every 5 days vs every 3 months). On price, ads, device support and iOS requirement 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. IF Strength asks for nothing beyond the download.
IF Strength ships an update every 3 months, Proof every 5 days. The most recent releases landed on October 15, 2026 and October 5, 2026 respectively.
| Parameter | IF Strength | Proof |
|---|---|---|
| Price | Free | Free |
| Rating | — | 5.0 (3 ratings) — better |
| Number of ratings | — | 3 — better |
| Update frequency | Every 3 months | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.1 | 15.0 — better |
| Further details — not scored | ||
| Size | 30 MB | 15 MB |
| Age rating | 4+ | 4+ |
| Developer | Senty ApS | Serafin Vazquez |
In-app purchases
IF Strength
No in-app purchases
Proof
- Full Instrument$7.99
