# Feynn vs ION

The clearest difference is update cadence: ION at fortnightly against Feynn's every 4 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Feynn ships an update every 4 months, ION fortnightly. The most recent releases landed on October 23, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | Feynn | ION |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/feynn/id6473211229/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 7 MB | 56 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Emilio Cortina Labra](https://appshunter.io/developer/1718620582) | [CARLOS MARTIN DE ARGILA LORENTE](https://appshunter.io/developer/1869158134) |

## What reviewers say

### Feynn

[App page](https://appshunter.io/ios/app/feynn/id6473211229)

This app helps you plan and track your gym workouts with a customizable interface. Organize exercises by muscle group, add descriptions and images, and log previous performance to motivate improvement. Live workout tracking is available from the lock screen.

**Highlights:** Customizable workout planner, Exercise cataloging, Organize by muscle group, Add exercise details and images, Log previous marks, Visual data representations, Live workout tracking on lock screen

**Features:** macOS Compatibility

**In-app purchases:** none


### ION

[App page](https://appshunter.io/ios/app/ion-workout-log/id6757827438)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Feynn free?

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

### Is ION free?

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

### Do Feynn or ION have ads?

Neither Feynn nor ION shows ads.

### Which is updated more often, Feynn or ION?

Feynn ships an update every 4 months, and ION fortnightly. Most recently, Feynn was updated on October 23, 2026 and ION on October 9, 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.*