# James Owl Calc vs TimerGlass

The clearest difference is price: James Owl Calc at Free against TimerGlass's $7.99. James Owl Calc also leads on update cadence (weekly vs fortnightly). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

James Owl Calc is free to download; TimerGlass costs $7.99 up front. Neither carries in-app purchases, so what you see is what you pay.

James Owl Calc ships an update weekly, TimerGlass fortnightly. The most recent releases landed on October 9, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | James Owl Calc | TimerGlass |
| --- | --- | --- |
| Price | **Free** | $7.99 |
| 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** | Fortnightly |
| Monetization | Free | — |
| Size | 32 MB | 5 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [James Zhen Yu](https://appshunter.io/developer/1723033163) | [存滨 崔](https://appshunter.io/developer/1809703940) |

## 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


### TimerGlass

[App page](https://appshunter.io/ios/app/timerglass/id6761681913)

**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 TimerGlass free?

TimerGlass costs $7.99, with no in-app purchases.

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

Neither James Owl Calc nor TimerGlass shows ads.

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

James Owl Calc ships an update weekly, and TimerGlass fortnightly. Most recently, James Owl Calc was updated on October 9, 2026 and TimerGlass on October 16, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*