# Flux vs Ester

The clearest difference is iOS requirement: Ester at 18.0 against Flux's 26.2. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Flux sells 4 in-app purchases, starting at $2.99 per month and Ester sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | Flux | Ester |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/flux-workout-tracker/id6758521633/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Weekly | — |
| Monetization | Freemium | — |
| Size | 47 MB | 3 MB |
| Requires iOS | 26.2 | **18.0** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 12+ |
| Developer | [Digital Flux Ltd](https://appshunter.io/developer/1873322568) | [Castaneda Networks LLC](https://appshunter.io/developer/1887905253) |

## What reviewers say

### Flux

[App page](https://appshunter.io/ios/app/flux-workout-tracker/id6758521633)

This app helps you train smarter by generating personalized workouts based on your goals, available equipment, and time. It uniquely adapts to your progress over time, keeping all your data on your device for privacy. Track every set, rep, and weight with ease, and benefit from advanced features like progressive overload and fatigue-aware training.

**Highlights:** Personalized workout generation, Customizable routines and exercises, Real-time adaptive changes, Progressive overload and periodisation, Fatigue-aware training support, Apple Health integration, Data export

**Features:** macOS Compatibility

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flux Pro : 1 Month | $2.99 | per month |
| Flux Pro : 12 Month | $19.99 | per year |
| Flux Pro : Lifetime Pass - Founder | $49.99 | one-time |
| Flux Pro : Lifetime Pass | $59.99 | one-time |


### Ester

[App page](https://appshunter.io/ios/app/ester-dose-and-lab-tracker/id6778684239)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Ester Pro | $4.99 | per month |
| Ester Pro | $29.99 | per year |


## Frequently asked questions

### Is Flux free?

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

### Is Ester free?

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

### Do Flux or Ester have ads?

Neither Flux nor Ester shows ads.

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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.*