Light Ruler: Photo Toolkit
ND, DoF, Night Sky Calculator
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
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
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
- Enhanced parameter input experience
- Improved calculator navigation for a more focused and clearer experience
The developer, 小倩 徐, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Collected
The developer does not collect any data from this app.
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- 小倩 徐
- Size
- 981 KB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
English and 2 more
- English, Japanese, Simplified Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Lifetime Pro Unlock $2.99
- Copyright
- © 2026 Xuxiaoqian