# IF Strength vs Proof

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.

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.

## The numbers

| Metric | IF Strength | Proof |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/proof-lifting-log/id6777612827/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | — | Free |
| Size | 30 MB | 15 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Senty ApS](https://appshunter.io/developer/1666208957) | [Serafin Vazquez](https://appshunter.io/developer/6777613189) |

## What reviewers say

### IF Strength

[App page](https://appshunter.io/ios/app/if-strength/id1666207485)

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

**In-app purchases:** none


### Proof

[App page](https://appshunter.io/ios/app/proof-lifting-log/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, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full Instrument | $7.99 | one-time |


## Frequently asked questions

### Is IF Strength free?

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

### Is Proof free?

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

### Do IF Strength or Proof have ads?

Neither IF Strength nor Proof shows ads.

### Which is updated more often, IF Strength or Proof?

IF Strength ships an update every 3 months, and Proof every 5 days. Most recently, IF Strength was updated on October 15, 2026 and Proof on October 5, 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.*