# Optaxis vs Lumo Light Meter

The clearest difference is update cadence: Optaxis at every 4 days against Lumo Light Meter's every 3 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Optaxis sells 2 in-app purchases, starting at $5.99 per month and Lumo Light Meter sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Optaxis ships an update every 4 days, Lumo Light Meter every 3 months. The most recent releases landed on September 16, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | Optaxis | Lumo Light Meter |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 4 days** | Every 3 months |
| Size | 123 MB | 2 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [XIAO MIN NI](https://appshunter.io/developer/1887064548) | [Ninja Lab Studios](https://appshunter.io/developer/475343425) |

## What reviewers say

### 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 |


### Lumo Light Meter

[App page](https://appshunter.io/ios/app/lumo-light-meter/id6764608053)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lumo Pro | $1.99 | one-time |


## Frequently asked questions

### Is Optaxis free?

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

### Is Lumo Light Meter free?

Lumo Light Meter is free to download, with in-app purchases available.

### Do Optaxis or Lumo Light Meter have ads?

Neither Optaxis nor Lumo Light Meter shows ads.

### Which is updated more often, Optaxis or Lumo Light Meter?

Optaxis ships an update every 4 days, and Lumo Light Meter every 3 months. Most recently, Optaxis was updated on September 16, 2026 and Lumo Light Meter on September 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.*