# James Owl Calc vs LightMate

The clearest difference is price: James Owl Calc at Free against LightMate's $0.99. James Owl Calc also leads on device support (3 vs 1) and iOS requirement (16.0 vs 18.0). On update cadence, ads and in-app purchases there is nothing between them.

James Owl Calc is free to download; LightMate costs $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.

James Owl Calc ships an update weekly, LightMate every 2 weeks. The most recent releases landed on October 24, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | James Owl Calc | LightMate |
| --- | --- | --- |
| Price | **Free** | $0.99 |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/james-owl-calc/id6667115988/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 weeks |
| Monetization | Free | — |
| Size | 32 MB | 1 MB |
| Requires iOS | **16.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [James Zhen Yu](https://appshunter.io/developer/1723033163) | [Qiao Hu](https://appshunter.io/developer/1076093840) |

## What reviewers say

### James Owl Calc

[App page](https://appshunter.io/ios/app/james-owl-calc/id6667115988)

This tool helps landscape photographers calculate precise camera settings for long exposure shots. It recommends ND filter combinations, aperture, and ISO based on your current settings and desired effect. Features include tutorials and camera-specific adjustments.

**Highlights:** Precise exposure calculations for ND filters, Reverse calculation mode, Smart adaptive technology for light changes, Built-in countdown timer with audio alerts, Camera-specific settings, Long exposure technique tutorials

**Features:** macOS Compatibility

**In-app purchases:** none


### LightMate

[App page](https://appshunter.io/ios/app/lightmate-expocalc/id6743069293)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is James Owl Calc free?

James Owl Calc is free to download, with no in-app purchases.

### Is LightMate free?

LightMate costs $0.99, with no in-app purchases.

### Do James Owl Calc or LightMate have ads?

Neither James Owl Calc nor LightMate shows ads.

### Which is updated more often, James Owl Calc or LightMate?

James Owl Calc ships an update weekly, and LightMate every 2 weeks. Most recently, James Owl Calc was updated on October 24, 2026 and LightMate on October 28, 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.*