Spool Zone vs KatMon
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spool Zone
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【Key Features】 • Inventory Tracking: Keep track of your filament stock at all times and restock promptly to avoid running out • Usage History: Detailed records of filament usage per print for easy cost tracking • Cost Tracking: Accurately track the cost per gram of filament to make printing more economical • Categorized Management: Organize filaments by type, color, and other criteria • Data Sync: Cloud storage and multi-device access ensure your data is never lost 【Member Benefits】 • Add an unlimited number of consumables 【Official Website】 • https://spool.zone Make every print effortless and ensure every gram of consumable is used to its full potential!
KatMon
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KatMon is an all-in-one digital toolbox designed for 3D printer users and makers to streamline every step of the production process. More than just a filament management tool, it is a smart ecosystem that brings artificial intelligence, creator networking, STL analysis, and printer maintenance monitoring right to your pocket—keeping your 3D printing workflow controlled, layer by layer. Key Features: Smart Filament Calculator & Inventory Management: Accurately calculate remaining filament weight using our comprehensive empty spool database, and track your entire inventory with zero errors. STL Viewer & Material Analysis: Preview your 3D models directly within the app, and calculate volume, weight, and material costs before sending them to print. Gemini AI-Powered Assistant: Get instant solutions for print failures, slicing configurations, and technical troubleshooting from a dedicated 3D printing AI companion. Maker Network: Connect with fellow makers, showcase your latest 3D prints, share slicer profiles, and solve technical challenges together with the community. Maintenance Monitor & Scheduler: Never forget nozzle replacements, belt tensioning, or rod lubrication. Extend your printer's lifespan with customized maintenance alerts. 3D Printing News & Tech Trends: Stay up to date with the latest industry innovations, new filament releases, and community updates. Spool Tower Mini-Game: Pass the time while waiting for your long prints to finish with a fun, maker-themed mini-game. Why KatMon? Varying empty spool weights across brands make guessing remaining filament highly inaccurate. Running out of material mid-print ruins projects, wastes time, and costs money. KatMon eliminates the guesswork by providing powerful calculation tools, a built-in STL preview engine, and advanced AI assistance to make your 3D printing workflow controlled, seamless, and efficient. Start creating with the ultimate digital companion for your 3D printer today!
Screenshots
Verdict
The clearest difference is in-app purchases: KatMon at none against Spool Zone's 3. KatMon also leads on update cadence (every 2 days vs weekly). Spool Zone's advantage is iOS requirement (13.0 vs 15.0). On price, ads and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Spool Zone sells 3 one-off in-app purchases. KatMon asks for nothing beyond the download.
Spool Zone ships an update weekly, KatMon every 2 days. The most recent releases landed on October 12, 2026 and October 3, 2026 respectively.
| Parameter | Spool Zone | KatMon |
|---|---|---|
| Price | Free | Free |
| Update frequency | Weekly | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 84 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | 玉文 赵 | Olcay OREN |
In-app purchases
Spool Zone
- SpoolZoneAir$4.99
- Lifetime Membership$7.99
- SpoolZonePro$7.99
KatMon
No in-app purchases









