# KAI by Keep Labs vs Variable Resistance Training

The clearest difference is rating: KAI by Keep Labs at 5.0 against Variable Resistance Training's 3.7. KAI by Keep Labs also leads on in-app purchases (none vs 3) and ads (none vs shown). Variable Resistance Training's advantage is update cadence (every 6 days vs every 3 weeks) and ratings volume (3 vs 1). On price and device support there is nothing between them.

Both are free to download. Variable Resistance Training sells 3 in-app purchases, starting at $3.99 per month. KAI by Keep Labs asks for nothing beyond the download.

KAI by Keep Labs holds the better App Store score, 5.0 against 3.7. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

KAI by Keep Labs ships an update every 3 weeks, Variable Resistance Training every 6 days. The most recent releases landed on September 22, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | KAI by Keep Labs | Variable Resistance Training |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/kai-by-keep-labs/id6746725211/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/variable-resistance-training/id6749834451/reviews) |
| Number of ratings | 1 | **3** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 6 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 56 MB | 86 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 12+ | 4+ |
| Developer | [KEEP Labs Inc.](https://appshunter.io/developer/1532114524) | [Andrew Soumbos](https://appshunter.io/developer/1812962868) |

## What reviewers say

### KAI by Keep Labs

[App page](https://appshunter.io/ios/app/kai-by-keep-labs/id6746725211)

An AI-powered coach designed to help individuals with rare conditions manage their treatment and symptoms. It offers tools for tracking, understanding health patterns, and staying on track with therapy, providing support for both patients and caregivers.

**Highlights:** AI-powered treatment coaching, Symptom tracking and pattern analysis, Smart medication reminders, Health insights and pattern discovery, Support for patients and caregivers, Treatment and symptom management tools

**In-app purchases:** none


### Variable Resistance Training

[App page](https://appshunter.io/ios/app/variable-resistance-training/id6749834451)

This app offers advanced tracking for resistance band workouts, automatically calculating resistance and progression based on your saved equipment. It also supports tracking weights and calisthenics, providing detailed analytics and a video library for exercise demonstrations.

**Highlights:** Automatic band resistance calculation, Dynamic resistance progression generation, Weight and calisthenics tracking, Full video exercise library, Detailed analytics and progress charts, Customizable rest timer, Superset functionality

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| VRT Monthly | $3.99 | per month |
| VRT Annual | $39.99 | per year |
| VRT Lifetime Pro | $149.99 | one-time |


## Frequently asked questions

### Is KAI by Keep Labs free?

KAI by Keep Labs is free to download, with no in-app purchases.

### Is Variable Resistance Training free?

Variable Resistance Training is free to download, with in-app purchases available.

### Which has better reviews, KAI by Keep Labs or Variable Resistance Training?

KAI by Keep Labs is rated higher. KAI by Keep Labs averages 5.0 out of 5 from 1 ratings, while Variable Resistance Training averages 3.7 from 3 ratings.

### Do KAI by Keep Labs or Variable Resistance Training have ads?

Variable Resistance Training shows ads; KAI by Keep Labs does not.

### Which is updated more often, KAI by Keep Labs or Variable Resistance Training?

KAI by Keep Labs ships an update every 3 weeks, and Variable Resistance Training every 6 days. Most recently, KAI by Keep Labs was updated on September 22, 2026 and Variable Resistance Training on September 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.*