# Lumo Light Meter vs ZoneCalc

The clearest difference is update cadence: ZoneCalc at every 3 weeks 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. Lumo Light Meter sells 1 one-off in-app purchase and ZoneCalc sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Lumo Light Meter ships an update every 3 months, ZoneCalc every 3 weeks. The most recent releases landed on October 2, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | Lumo Light Meter | ZoneCalc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | — | Freemium |
| Size | 2 MB | 3 MB |
| Requires iOS | 18.0 | **17.6** |
| Devices | iPhone | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Ninja Lab Studios](https://appshunter.io/developer/475343425) | [Juergen Suk](https://appshunter.io/developer/6772102748) |

## What reviewers say

### 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 |


### ZoneCalc

[App page](https://appshunter.io/ios/app/zonecalc-zone-system-meter/id6772102746)

This app assists photographers in precisely calculating exposure and tonal placement using Ansel Adams' Zone System. It offers features for metering, reciprocity correction, and development adjustments, with options for multi-point measurements and data export.

**Highlights:** Zone System exposure calculation, Multi-point metering, Reciprocity correction, Development adjustment recommendations, Film-specific development times, Calculation history and export

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ZoneCalc Pro | $3.99 | one-time |


## Frequently asked questions

### Is Lumo Light Meter free?

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

### Is ZoneCalc free?

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

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

Neither Lumo Light Meter nor ZoneCalc shows ads.

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

Lumo Light Meter ships an update every 3 months, and ZoneCalc every 3 weeks. Most recently, Lumo Light Meter was updated on October 2, 2026 and ZoneCalc on October 12, 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.*