# Passion Iron vs Posture Chart

The clearest difference is in-app purchases: Passion Iron at none against Posture Chart's 2. Passion Iron also leads on iOS requirement (15.6 vs 17.0). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Posture Chart sells 2 in-app purchases, starting at $9.99 per month. Passion Iron asks for nothing beyond the download.

Passion Iron ships an update monthly, Posture Chart every 3 weeks. The most recent releases landed on October 1, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Passion Iron | Posture Chart |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/posture-chart/id6744533947/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 54 MB | 6 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [TrantorMind s.r.l](https://appshunter.io/developer/1331878308) | [Kent Health Systems, Inc.](https://appshunter.io/developer/1808016208) |

## What reviewers say

### Passion Iron

[App page](https://appshunter.io/ios/app/passion-iron/id6474903085)

**Features:** macOS Compatibility, Apple Wallet

**In-app purchases:** none


### Posture Chart

[App page](https://appshunter.io/ios/app/posture-chart/id6744533947)

This app transforms your iPhone into a portable posture assessment tool. It allows health professionals to quickly and accurately analyze posture, document progress, and educate clients with visual aids. Ideal for chiropractors, therapists, and trainers on the go.

**Highlights:** Portable postural analysis, Professional-grade grid chart, Photo documentation, Client education tools, Customizable workflow, Progress tracking

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Watermark - Monthly | $9.99 | per month |
| Watermark - One Time | $149.99 | one-time |


## Frequently asked questions

### Is Passion Iron free?

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

### Is Posture Chart free?

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

### Do Passion Iron or Posture Chart have ads?

Neither Passion Iron nor Posture Chart shows ads.

### Which is updated more often, Passion Iron or Posture Chart?

Passion Iron ships an update monthly, and Posture Chart every 3 weeks. Most recently, Passion Iron was updated on October 1, 2026 and Posture Chart on October 14, 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.*