# ND+Timer vs James Owl Calc

The clearest difference is review sentiment: James Owl Calc at 100% against ND+Timer's 60%. James Owl Calc also leads on in-app purchases (none vs 1) and update cadence (weekly vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. ND+Timer sells 1 one-off in-app purchase. James Owl Calc asks for nothing beyond the download.

ND+Timer ships an update every 2 months, James Owl Calc weekly. The most recent releases landed on October 7, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | ND+Timer | James Owl Calc |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (4 ratings)](https://appshunter.io/ios/app/james-owl-calc/id6667115988/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | 60.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Weekly** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 32 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Tobias Ullerich](https://appshunter.io/developer/1475365559) | [James Zhen Yu](https://appshunter.io/developer/1723033163) |

## What reviewers say

### ND+Timer

[App page](https://appshunter.io/ios/app/nd-plus-timer/id1534477340)

This app helps photographers determine correct exposure times for long exposure shots using ND filters. It includes a timer to capture the perfect moment and offers pro features through in-app purchases for enhanced functionality.

**Highlights:** Exposure time calculation with ND filters, Integrated timer for capturing moments, Notifications while device is locked, Dark mode (Pro feature), Lock screen widget with running timer (Pro feature), Dynamic Island support (Pro feature), Automatic exposure computation for multiple filters (Pro feature)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| ND+Timer Pro | $1.99 | one-time |


### 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


## Frequently asked questions

### Is ND+Timer free?

ND+Timer is free to download, with in-app purchases available.

### Is James Owl Calc free?

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

### Do ND+Timer or James Owl Calc have ads?

Neither ND+Timer nor James Owl Calc shows ads.

### Which is updated more often, ND+Timer or James Owl Calc?

ND+Timer ships an update every 2 months, and James Owl Calc weekly. Most recently, ND+Timer was updated on October 7, 2026 and James Owl Calc on September 22, 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.*