# Light Meter vs 光量ノート

Light Meter and 光量ノート are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

Both are free to download. Light Meter sells 1 one-off in-app purchase and 光量ノート sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Light Meter ships an update every 2 months, 光量ノート every 5 weeks. The most recent releases landed on October 8, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Light Meter | 光量ノート |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 5 weeks** |
| Size | 6 MB | 2 MB |
| Requires iOS | **17.0** | 18.0 |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Phuc Pham](https://appshunter.io/developer/1893081423) | [Shuhei Yamamoto](https://appshunter.io/developer/1896725589) |

## What reviewers say

### Light Meter

[App page](https://appshunter.io/ios/app/light-meter-plant-lux-and-ppfd/id6772273072)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime Pro | $29.99 | one-time |


### 光量ノート

[App page](https://appshunter.io/ios/app/ppfd/id6799558549)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 光量ノート Pro | $4.99 | one-time |


## Frequently asked questions

### Is Light Meter free?

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

### Is 光量ノート free?

光量ノート is free to download, with in-app purchases available.

### Do Light Meter or 光量ノート have ads?

Neither Light Meter nor 光量ノート shows ads.

### Which is updated more often, Light Meter or 光量ノート?

Light Meter ships an update every 2 months, and 光量ノート every 5 weeks. Most recently, Light Meter was updated on October 8, 2026 and 光量ノート on October 24, 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.*