# Posture Trainer vs Plank Timer

The clearest difference is in-app purchases: Plank Timer at none against Posture Trainer's 3. Plank Timer also leads on update cadence (every 9 days vs monthly) and device support (3 vs 1). Posture Trainer's advantage is ads (none vs shown). On price there is nothing between them.

Both are free to download. Posture Trainer sells 3 in-app purchases, starting at $6.99 per 7 days. Plank Timer asks for nothing beyond the download.

Posture Trainer ships an update monthly, Plank Timer every 9 days. The most recent releases landed on September 26, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | Posture Trainer | Plank Timer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Monthly | **Every 9 days** |
| Size | 13 MB | 94 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Phuc Pham](https://appshunter.io/developer/1893081423) | [ChangHyun Nam](https://appshunter.io/developer/1850596911) |

## What reviewers say

### Posture Trainer

[App page](https://appshunter.io/ios/app/posture-trainer-sit-straight/id6772211099)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly | $6.99 | per 7 days |
| Yearly | $34.99 | per year |
| Lifetime Pro | $69.99 | one-time |


### Plank Timer

[App page](https://appshunter.io/ios/app/plank-timer-motionfit/id6800519625)

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

**In-app purchases:** none


## Frequently asked questions

### Is Posture Trainer free?

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

### Is Plank Timer free?

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

### Do Posture Trainer or Plank Timer have ads?

Plank Timer shows ads; Posture Trainer does not.

### Which is updated more often, Posture Trainer or Plank Timer?

Posture Trainer ships an update monthly, and Plank Timer every 9 days. Most recently, Posture Trainer was updated on September 26, 2026 and Plank Timer on September 28, 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.*