Comparison

31Log vs Leather Project Tracker

Price, ratings, monetisation and update history for both apps, side by side โ€” with what reviewers say about each.

Head to head
About

31Log

Features
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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.

About

Leather Project Tracker

Features
Read full description

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

31Log3 screens
Leather Project Tracker4 screens

Verdict

The call

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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.

UpkeepUpdate frequency

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.

Scorecard3 real differences ยท 3 level
31Log versus Leather Project Tracker: the parameters behind the verdict, then further details
Parameter31LogLeather Project Tracker
PriceFreeFree
Update frequencyEvery 4 monthsEvery 2 months โ€” better
AdsYesNo โ€” better
In-app purchasesNo โ€” betterYes
DevicesiPhone, iPad โ€” betteriPhone
Requires iOS17.6 โ€” better18
Further details โ€” not scored
Size9 MB11 MB
Age rating4+4+
DeveloperKana UchidaKarol Jaworski

In-app purchases

None

31Log

No in-app purchases

3 purchases

Leather Project Tracker

Subscriptions3
  • Hide Pro$4.991 Month
  • Hide Pro1 Year trial$39.991 Year
  • Hide Pro$39.991 Year

Questions

Is 31Log free?
31Log is free to download, with no in-app purchases.
Is Leather Project Tracker free?
Leather Project Tracker is free to download, with in-app purchases available.
Do 31Log or Leather Project Tracker have ads?
31Log shows ads; Leather Project Tracker does not.
Which is updated more often, 31Log or Leather Project Tracker?
31Log ships an update every 4 months, and Leather Project Tracker every 2 months. Most recently, 31Log was updated on October 30, 2026 and Leather Project Tracker on October 31, 2026.

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