31Log vs Leather Project Tracker
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
31Log
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Capture every change in a single time-lapse video. A specialized recording app to "fixed-point observe" small daily growth and changes, and compile your 31-day journey into one video. Support for your 31-day challenge: A 31-day recording cycle makes it easy to set a "one-month" goal. Your daily progress remains visible and tangible. Progress management with Calendar: Equipped with a calendar view to see your shooting status at a glance. Helps you keep recording daily with joy and consistency. Swipe-to-review Log: Photos can be reviewed intuitively like a flipbook with swipe gestures. Feel the process of change firsthand. One-tap Video Generation: Once your 31-day record is complete, export a high-quality time-lapse video with a single button. Perfect for SNS sharing or personal growth logs. Plant growth, fitness body changes, diet progress, or the daily sky. Save your "31-day story" as a special video.
Leather Project Tracker
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Every leatherworker has had the same moment: a customer asks to reorder that wallet from six months ago. What leather was it? What weight? Which tannery? What dye? Without a project log, you're guessing. Hide is the build journal built for leatherworkers. Log every detail of every project - leather type and tannery, thread weight and color, hardware specs, technique notes, and hours spent. When the reorder comes in, the answer is three taps away. TRACK YOUR BUILDS Document projects from pattern to finished piece. Record the leather (Wickett and Craig Harness, 4-5oz, English Tan), the thread (Tiger 0.6mm, cream), the hardware (solid brass trigger snaps), and every technique choice that made the difference. Build stages keep you organized from cutting through edge finishing. KNOW YOUR LEATHER INVENTORY Catalog every hide, offcut, and scrap with tannery, type, weight, color, and remaining square footage. Know exactly what you have before you start planning your next project. TRACK YOUR TRUE HOURLY RATE Log hours per build stage and add your materials cost. Hide calculates your actual hourly rate across every project - not what you hoped you were making, but what you're actually making. Essential if you sell at craft fairs or on Etsy. HARDWARE AND TOOLS INVENTORY Stop searching drawers for that one 3/4 inch solid brass D-ring. Catalog your hardware by size, finish, and quantity. Track your tools and when they need sharpening or replacing. AI LEATHER GUIDE (Pro) Get answers about leather properties, technique questions, and finishing methods - specific to the project you're working on. Ask about edge finishing on veg-tan, thread tension for hand-stitching, or conditioner recommendations for shell cordovan. PDF PORTFOLIO EXPORT (Pro) Generate a professional build report for any project. Shareable with customers, useful for insurance documentation, or just satisfying to review your own progress over time. BUILT FOR THE CRAFT - Works offline - your build logs are always available, no internet required - Supports all leather types: veg-tan, bridle, harness, Chromexcel, shell cordovan, latigo, suede, and more - Designed for the material obsession that makes leathercraft what it is FREE TIER INCLUDES - Up to 5 projects - Full project detail logging - Materials and tool inventory HIDE PRO - Unlimited projects and inventory - AI Leather Guide - PDF portfolio export - Cross-project search including leather details - Priority support Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is in-app purchases: 31Log at none against Leather Project Tracker's 3. Leather Project Tracker's advantage is ads (none vs shown) and update cadence (every 2 months vs every 4 months). On price, device support and iOS requirement there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Leather Project Tracker sells 3 in-app purchases, starting at $4.99 per month. 31Log asks for nothing beyond the download.
31Log ships an update every 4 months, Leather Project Tracker every 2 months. The most recent releases landed on October 30, 2026 and October 31, 2026 respectively.
| Parameter | 31Log | Leather Project Tracker |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 4 months | Every 2 months โ better |
| Ads | Yes | No โ better |
| In-app purchases | No โ better | Yes |
| Devices | iPhone, iPad โ better | iPhone |
| Requires iOS | 17.6 โ better | 18 |
| Further details โ not scored | ||
| Size | 9 MB | 11 MB |
| Age rating | 4+ | 4+ |
| Developer | Kana Uchida | Karol Jaworski |
In-app purchases
31Log
No in-app purchases
Leather Project Tracker
- Hide Pro$4.991 Month
- Hide Pro1 Year trial$39.991 Year
- Hide Pro$39.991 Year
Questions
Is 31Log free?
Is Leather Project Tracker free?
Do 31Log or Leather Project Tracker have ads?
Which is updated more often, 31Log or Leather Project Tracker?
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