Mortise
Fine Woodworking Calculator
Only for iPhone
$4.99 · Designed for iPhone. Not verified for macOS.
iPhone
The ultimate fine woodworking app. From layouts, board feet (with cost), and more! Learn about woods and the finishes that suit them. Offline. No subscription.
Mortise is the shop calculator woodworkers actually reach for. It's fast, accurate, works entirely offline, and never asks for an account.
FRACTION CALCULATOR
• Type feet, inches, and fractions the way you read a tape: 5' 3 1/2" + 17 1/4 − 3/16
• Exact fraction math, so 1/3 + 1/3 + 1/3 really equals 1
• Results in fractions (to 1/8, 1/16, 1/32, or 1/64), decimals, feet-inches, and millimetres
• Quick-fraction keys, an mm key, history, and "divide into equal parts" with layout marks
CONVERTER AND FEELER GAUGES
• Fractions, decimals, thousandths, millimetres, and centimetres, all at once
• Finds the fewest feeler-gauge leaves that stack to any thickness, using your own set
• A full 1/64" reference chart
SQUARE YOUR CROSSCUT SLED
• A step-by-step guide to the 5-cut method, with diagrams that rotate the test piece for you
• Enter your caliper readings and Mortise tells you how far to move the fence, which way, and which feeler leaf to use
• Track every attempt and watch your error shrink
LAYOUT AND JOINERY
• Balusters and pickets: max gap, fixed count, or fixed gap, with layout marks you can tick off as you go
• Stair rake, multiple sections, and fence post spacing
• Dovetails and box joints, with even, golden-ratio, graduated, or crowned spacing
• Polygon and compound miters, arcs from chord and rise, kerf bending, and board feet
WOOD SPECIES GUIDE
• 270 species from around the world: hardness, bending strength, stiffness, weight, and shrinkage
• Steam-bending ratings, rot resistance, and workability notes
• Conservation status (IUCN Red List and CITES), including rare, protected, and extinct woods
• Search by trade name, sort by any property, and compare species side by side
BUILT FOR THE SHOP
• Large keys for dusty fingers, haptic feedback, and dark mode
• No internet needed, no ads, no subscriptions, no tracking. Mortise collects no data at all.
One purchase. Everything included.
and more!
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
• Clearer 5-cut sled instructions: numbered steps, and directions that match where your fence’s pivot is.
• Optimized for iPhone Duo.
The developer, Joshua Darling, 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
- Joshua Darling
- Size
- 3.9 MB
- 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
- © PC3 Media Group LLC. 2026
