Spool Master vs KatMon
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Spool Master
Manage your 3D printing filament stock with NFC tag reading/writing, inventory tracking, and smart shopping lists. Optimize expenses and reduce waste for hobbyists and professionals.
- NFC reading and writing for spool tags
- Complete inventory management
- Detailed statistics and value tracking
- Automatic low stock alerts
- Smart shopping list generation
- Print settings configuration
- Multi-device synchronization
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Spool Master - The complete app to manage your 3D printing filament stock MAIN FEATURES NFC Reading and Writing • Read NFC chips from Anycubic, Bambu Lab, Prusa and Creality spools • Write your own custom NFC tags • Clone NFC tags for reuse • Compatible with all NFC tag formats Complete Inventory Management • Add spools by NFC scan or manually • Track remaining weight of each spool • Manage prices and calculate total value • Organize by brand, material and color • Automatic low stock alerts Detailed Statistics • Overview of your inventory • Total value of your stock • Number of materials, colors and brands • Automatic shopping list Smart Shopping List • Automatic addition of low stock spools • Mark ordered filaments • Add manually or by NFC scan Advanced Color Picker • Full palette with RGB sliders • Opacity support • Real-time preview Print Settings • Extruder temperatures (min/max) • Bed temperatures (min/max) • Filament diameter • Spool length COMPATIBILITY • Anycubic: Full reading and writing • Bambu Lab: RFID tag reading and writing • Prusa: OpenPrintTag reading and writing (NFC-V) • Creality CFS: Tag reading and writing • Generic NFC tags: Custom writing • Support for 22 filament brands • Support for 25 material types (PLA, PETG, ABS, TPU, etc.) MULTILINGUAL App available in 40 languages SYNCHRONIZATION • Multi-device synchronization • Offline mode available UNITS AND CURRENCIES • Multiple currency support • Metric or imperial units • Automatic conversion MODERN INTERFACE • Dark and light mode • Sleek design • Intuitive navigation • Visual statistics SECURITY AND PRIVACY • Your data remains private • Secure local storage PREMIUM VERSION AVAILABLE • Cloud synchronization • Ad-free • Priority support Whether you're a hobby maker or a professional 3D printer, Spool Master helps you optimize your filament management, reduce waste and control your expenses. Download now and take control of your filament inventory! https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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 Master's 2. KatMon also leads on ads (none vs shown) and update cadence (every 2 days vs every 4 days). On price, device support and iOS requirement 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 Master sells 2 in-app purchases, starting at $1.99 per month. KatMon asks for nothing beyond the download.
Spool Master ships an update every 4 days, KatMon every 2 days. The most recent releases landed on October 1, 2026 and October 3, 2026 respectively.
| Parameter | Spool Master | KatMon |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 days | Every 2 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 39 MB | 33 MB |
| Age rating | 4+ | 4+ |
| Developer | Sebastien Girod | Olcay OREN |
In-app purchases
Spool Master
- Spool Master Monthly$1.991 Month
- Spool Master Yearly$9.991 Year
KatMon
No in-app purchases









