# i vs HY

The clearest difference is update cadence: HY at every 9 days against i's every 14 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.

i ships an update every 14 months, HY every 9 days. The most recent releases landed on September 26, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | i | HY |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.4 (14 ratings)](https://appshunter.io/ios/app/i-scale/id926099803/reviews)** | — |
| Number of ratings | **14** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 14 months | **Every 9 days** |
| Monetization | Free | — |
| Size | 5 MB | 123 MB |
| Requires iOS | 16.0 | **15.6** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Shanghai Qingying Electronic Technology LLC](https://appshunter.io/developer/926099802) | [志波 朱](https://appshunter.io/developer/1823168317) |

## What reviewers say

### i

[App page](https://appshunter.io/ios/app/i-scale/id926099803)

Transform your microscope into a digital one using your phone and a special adapter. Capture images with embedded scale bars and annotations, then easily share them with others.

**Highlights:** Capture digital micrographs, Support magnification up to 5 objectives, Scale-bar embedding and calibration, Stamp remarks, date/time, magnification, Direct email and message sharing

**Features:** macOS Compatibility

**In-app purchases:** none


### HY

[App page](https://appshunter.io/ios/app/hy-fpv/id6749525735)

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

**In-app purchases:** none


## Frequently asked questions

### Is i free?

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

### Is HY free?

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

### Do i or HY have ads?

Neither i nor HY shows ads.

### Which is updated more often, i or HY?

i ships an update every 14 months, and HY every 9 days. Most recently, i was updated on September 26, 2026 and HY on October 13, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*