Interval - Spacing Calculator
Lay out repeated objects
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Plan evenly spaced pickets, balusters, hooks, brackets, slats, shelves, lights, and frames with a simple one-line layout tool.
Enter the measured span, object width, and object count. Interval calculates the gap and gives you every mark position from the same starting reference. Compare Equal ends with Flush ends, then use centerlines or left edges to mark the layout.
A scaled diagram makes the arrangement easy to check before you mark. Choose imperial or metric units; inch results use tape-friendly fractions and show calculated decimals when needed.
If the pieces cannot fit in the span, Interval tells you why.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Matthew Donders, 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
- Matthew Donders
- Size
- 400.4 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
- Age Rating
4+
- 4+
- Copyright
- © 2026 Matthew Donders