Hide: Leathermaker's Calc
Saddle-stitch math. Cited.
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
Free thread-length calculator. Hide Pro unlocks saddle-stitch SPI, edge / glue / dye matrices, brand presets. Stohlman + Armitage by name. Pay once at $6.99.
Hide is a leatherworking calculator with cited math. Every SPI, every thread-length rule, every edge-finish recommendation names its source. Pay once at $6.99 for Hide Pro — no subscription, no ads, no scanner.
The wedge
Most leatherworking apps stop at thread length. Hide includes thread length in the free tier (matches the incumbent's full surface) and unlocks the rest with one $6.99 lifetime purchase: saddle-stitch SPI by leather weight × project, edge-finish recommendation by leather temper, glue selection by use case, dye + sealant by goal, brand-aware presets. Every method tells you whose method it is.
Free tier
• Thread-length calculator — Stohlman's precision rule and Armitage's generous heuristic, side-by-side, with the leather-thickness math shown
• Leather weight oz → mm thickness conversion (1 oz ≈ 0.4 mm per Tandy convention)
• 1 saved project slot
• Brand picker showing the supplier names
Hide Pro ($6.99 lifetime)
• Saddle-stitch SPI by leather weight × project type, with awl-hole spacing in mm / inches
• Edge-finish matrix — burnish with water + gum tragacanth, burnish + Tokonole wax, edge paint, or wax burnish — selected by leather temper (veg-tan smooth, veg-tan thick, chrome-tan, bridle, oil-tan)
• Glue selection matrix — contact cement vs EVA white vs PVA vs hide glue — by use case + dry time + odor
• Dye + sealant matrix — spirit / oil / water dye, Resolene / acrylic / wax sealant, with compatibility warnings
• Brand-aware presets: Tandy Leather, Buckleguy, Maverick Leather, Wickett & Craig, Horween — typical SKU ranges + edge-finish recommendation per their leather chemistry
• Unlimited project log
• Citations & Sources screen with every author named
Honest authority story
Leatherworking has no USDA / AOCS / Knife Steel Nerds equivalent. Hide's authority is practitioner-tier, and we own that: Al Stohlman (The Art of Hand Sewing Leather, Tandy 1977), Nigel Armitage (Armitage Leather, UK), Stitchpunk (J.H. Sherman), Corter Leather & Cloth (Eric Heins), plus tannery technical sheets from Wickett & Craig, Horween, and Sedgwick & Co. Every number Hide displays tells you whose method it is so you can verify against the original.
The Moon Dog promise
• Pay once. No subscription. No ads.
• No account. No login. No signup. No network.
• Works fully offline.
• No data collection.
Disclaimer
Hide is for hobby leatherworking guidance. Independent verification against your supplier's technical sheets and your own project requirements is your responsibility.
© 2026 Roman Kopaliani
Ratings & Reviews
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The developer, Roman Kopaliani, 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
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Information
- Seller
- Roman Kopaliani
- Size
- 762.9 KB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - iPad
Requires iPadOS 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+
- In-App Purchases
Yes
- Hide Pro (lifetime) $6.99
- Copyright
- © 2026 Roman Kopaliani