# RapidExposure vs i IChing

The clearest difference is review sentiment: i IChing at 100% against RapidExposure's 38%. i IChing also leads on price (Free vs $0.99) and update cadence (every 10 days vs every 2 months). RapidExposure's advantage is in-app purchases (none vs 1) and iOS requirement (12.0 vs 16.6). On ads and device support there is nothing between them.

i IChing is free to download; RapidExposure costs $0.99 up front. i IChing sells 1 one-off in-app purchase. RapidExposure asks for nothing beyond the download.

RapidExposure ships an update every 2 months, i IChing every 10 days. The most recent releases landed on October 19, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | RapidExposure | i IChing |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Positive reviews | 37.5% of reviews | **100.0% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 10 days** |
| Monetization | Paid | **Free** |
| Size | 9 MB | 101 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HIROFUMI MARUO](https://appshunter.io/developer/667820705) | [QOOQ inc.](https://appshunter.io/developer/446639722) |

## What reviewers say

### RapidExposure

[App page](https://appshunter.io/ios/app/rapidexposure/id839420903)

This app transforms your iPhone into a professional exposure meter. It continuously measures light and displays ISO, F-stop, and shutter speed values without needing to take a photo. You can adjust these settings and lock the exposure to save a reference image with the calculated values.

**Highlights:** Real-time exposure measurement, Adjustable ISO, F-stop, and shutter speed, Exposure lock and reference value saving, History of saved exposure values, Tap-to-adjust exposure on preview, Detailed 1/3 step display mode

**Features:** macOS Compatibility

**In-app purchases:** none


### i IChing

[App page](https://appshunter.io/ios/app/i-iching/id1515102228)

This app offers authentic I Ching divination using a faithful digital recreation of the traditional yarrow stalk method. It provides over 250,000 characters of content, including original texts and Wilhelm commentary, to guide important life decisions.

**Highlights:** Authentic yarrow stalk divination, 250,000+ characters of content, Complete Wilhelm commentary, Ad-free divination experience, Browse all 64 hexagrams, Automatic reading history

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $7.99 | one-time |


## Frequently asked questions

### Is RapidExposure free?

RapidExposure costs $0.99, with no in-app purchases.

### Is i IChing free?

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

### Do RapidExposure or i IChing have ads?

Neither RapidExposure nor i IChing shows ads.

### Which is updated more often, RapidExposure or i IChing?

RapidExposure ships an update every 2 months, and i IChing every 10 days. Most recently, RapidExposure was updated on October 19, 2026 and i IChing on October 10, 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.*