# Light Ruler: Photo Toolkit — ND, DoF, Night Sky Calculator

> Local-first photography calculator for exposure, depth of field, and night sky planning. (iPhone/iPad app by 小倩 徐.)

- Source: https://appshunter.io/ios/app/light-ruler-photo-toolkit/id6779471175 (this page in markdown: same URL + `.md`)
- Developer: [小倩 徐](https://appshunter.io/developer/6771586178)
- Category: Utilities, Photo & Video
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 1 MB
- Languages: American English, Japanese, Chinese (Simplified, China)
- Released: 2026-06-18
- Data updated: 2026-08-23
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/light-ruler-photo-toolkit/id6779471175/reviews.md

## What is Light Ruler?

Light Ruler is a local-first photography calculator designed for iPhone. It is useful for landscape, long exposure, night sky, and everyday exposure planning.

You can quickly calculate:

- ND filter long exposure shutter speed
- Equivalent exposure for aperture, shutter, and ISO changes
- Depth of field, near limit, far limit, and hyperfocal distance
- Maximum night sky shutter before visible star trails
- Angle of view and equivalent focal length across sensor formats

Light Ruler does not require an account, does not connect to a backend, and does not actively make network requests. Camera profiles, lens profiles, and saved calculations are stored locally on your device.

Useful for:

- Long exposure with ND filters
- Night sky shutter planning
- Landscape depth of field and hyperfocal checks
- Comparing focal length behavior across sensor formats

## Key features

- ND filter long exposure calculation
- Equivalent exposure adjustments
- Depth of field and hyperfocal distance
- Night sky shutter speed limits
- Angle of view and focal length comparison
- Local data storage

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Lifetime Pro Unlock | $3.99 | one-time |


## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/light-ruler-photo-toolkit/id6779471175/reviews.md

### 5/5 — 使用感受

*2026-06-29*

简单高效

## Frequently asked questions about Light Ruler

### Does Light Ruler have ads?

Light Ruler does not contain advertisements. It is a free app with optional in-app purchases.

### What devices does Light Ruler support?

Light Ruler is designed for iPhone and is compatible with devices running iOS. It is not available on Android or other platforms.

### How often is Light Ruler updated?

The app was last updated on June 30, 2026, with version 1.1.0. This indicates a recent update, suggesting ongoing support and development.

### Is Light Ruler safe for children?

Light Ruler has an age rating of 4+, making it suitable for users of all ages. Its functionality is focused on photography calculations.

### Does Light Ruler require an internet connection?

No, Light Ruler is a local-first application. It does not require an account, connect to a backend, or actively make network requests, ensuring offline functionality.

### What kind of photography is Light Ruler best for?

Light Ruler is particularly useful for landscape, long exposure, and night sky photography. It assists with planning shutter speeds, depth of field, and exposure settings.

### Can I save my calculations in Light Ruler?

Yes, saved calculations, along with camera and lens profiles, are stored locally on your device. This allows you to access your planning data anytime.

## Version history (last 2 releases)

### 1.1.0 — 2026-06-30

- Enhanced parameter input experience
- Improved calculator navigation for a more focused and clearer experience

### 1.0.0 — 2026-06-18

No release notes.

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## More apps by 小倩 徐

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- [HomeKeep Pro](https://appshunter.io/ios/app/homekeep-pro/id6772906611)
- [Safe Check-In: Safety Monitor](https://appshunter.io/ios/app/safe-check-in-safety-monitor/id6773598005)

All apps by 小倩 徐: https://appshunter.io/developer/6771586178

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-23.*