# OCA vs Illuminance Meter

The clearest difference is in-app purchases: OCA at none against Illuminance Meter's 3. OCA also leads on iOS requirement (13.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Illuminance Meter sells 3 in-app purchases, starting at $3.99 per 7 days. OCA asks for nothing beyond the download.

## The numbers

| Metric | OCA | Illuminance Meter |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Monetization | — | Free with in-app purchases |
| Size | 29 MB | 13 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [THE PERMANENT SECRETARY, OFFICE OF - PRIME MINISTER OFF](https://appshunter.io/developer/1376018564) | [LEAN ASIA CO., LTD](https://appshunter.io/developer/1815050814) |

## What reviewers say

### OCA

[App page](https://appshunter.io/ios/app/oca/id6475000723)

**Features:** macOS Compatibility

**In-app purchases:** none


### Illuminance Meter

[App page](https://appshunter.io/ios/app/illuminance-meter-lux-ppfd/id6759972986)

Transform your iPhone into a professional light meter to measure illuminance in lux or foot-candles. Ideal for photographers, plant enthusiasts, and workplace safety, it provides instant, accurate light readings with various specialized modes and data export options.

**Highlights:** Real-time lux measurement with live gauge, Photography mode for exposure value (EV) calculation, Plant light mode with recommendations, Workplace standards verification, Measurement history with export options, Spectrum analysis for color temperature and CRI, Multiple illuminance unit switching

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Weekly Plan | $3.99 | per 7 days |
| Premium Yearly | $19.99 | per year |
| Lifetime | $39.99 | one-time |


## Frequently asked questions

### Is OCA free?

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

### Is Illuminance Meter free?

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

### Do OCA or Illuminance Meter have ads?

Neither OCA nor Illuminance Meter shows ads.

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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.*