# 光尺 vs Optaxis

The clearest difference is update cadence: Optaxis at every 4 days against 光尺's every 8 days. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. 光尺 sells 2 one-off in-app purchases and Optaxis sells 2 in-app purchases, starting at $5.99 per month. Whichever you choose, the download price is not the number that matters.

光尺 ships an update every 8 days, Optaxis every 4 days. The most recent releases landed on October 18, 2026 and October 20, 2026 respectively.

## The numbers

| Metric | 光尺 | Optaxis |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/id6758870725/reviews)** | — |
| Number of ratings | **1** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 8 days | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 4 MB | 123 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [浩宇 李](https://appshunter.io/developer/1875349921) | [XIAO MIN NI](https://appshunter.io/developer/1887064548) |

## What reviewers say

### 光尺

[App page](https://appshunter.io/ios/app/id6758870725)

This app combines a professional light meter with a precise laser rangefinder for film photographers. It addresses challenges with rangefinder and zone focus cameras in low light and fast-paced shooting, ensuring accurate exposures and sharp focus.

**Highlights:** Low-light metering engine, LiDAR laser precise focusing, Intelligent reciprocity failure compensation, Rangefinder and zone focus assistance, Accurate exposure for night scenes, Modern focusing for old cameras

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 暗光测光永久使用 | $2.99 | one-time |
| 测距永久会员 | $2.99 | one-time |


### Optaxis

[App page](https://appshunter.io/ios/app/optaxis/id6760964267)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly | $5.99 | per month |
| Yearly | $49.99 | per year |


## Frequently asked questions

### Is 光尺 free?

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

### Is Optaxis free?

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

### Do 光尺 or Optaxis have ads?

Neither 光尺 nor Optaxis shows ads.

### Which is updated more often, 光尺 or Optaxis?

光尺 ships an update every 8 days, and Optaxis every 4 days. Most recently, 光尺 was updated on October 18, 2026 and Optaxis on October 20, 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.*