# Workout for Underweight vs WeightUp

The clearest difference is in-app purchases: Workout for Underweight at none against WeightUp's 2. Workout for Underweight also leads on iOS requirement (16.0 vs 26.0). WeightUp's advantage is update cadence (weekly vs monthly). On price, ads and device support there is nothing between them.

Both are free to download. WeightUp sells 2 in-app purchases, starting at $3.99 per 7 days. Workout for Underweight asks for nothing beyond the download.

Workout for Underweight ships an update monthly, WeightUp weekly. The most recent releases landed on October 1, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Workout for Underweight | WeightUp |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Size | 66 MB | 8 MB |
| Requires iOS | **16.0** | 26.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 17+ |
| Developer | [Ngoc Thanh Pham](https://appshunter.io/developer/907794619) | [Jimpei Yamamoto](https://appshunter.io/developer/1510733955) |

## What reviewers say

### Workout for Underweight

[App page](https://appshunter.io/ios/app/workout-for-underweight/id6746104775)

**Features:** macOS Compatibility

**In-app purchases:** none


### WeightUp

[App page](https://appshunter.io/ios/app/weightup-weight-gain-tracker/id6753589816)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| プレミアム1週間 | $3.99 | per 7 days |
| プレミアム1ヶ月 | $6.99 | per month |


## Frequently asked questions

### Is Workout for Underweight free?

Workout for Underweight is free to download, with no in-app purchases.

### Is WeightUp free?

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

### Do Workout for Underweight or WeightUp have ads?

Neither Workout for Underweight nor WeightUp shows ads.

### Which is updated more often, Workout for Underweight or WeightUp?

Workout for Underweight ships an update monthly, and WeightUp weekly. Most recently, Workout for Underweight was updated on October 1, 2026 and WeightUp on October 16, 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.*