Model Scaler vs Spoolstock
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Model Scaler
This tool instantly converts measurements between U.S. Customary and Metric units for any modeling scale. It's designed to be fast, easy, and efficient for all types of scale modelers.
- Instant scale conversion
- U.S. Customary to Metric
- Metric to U.S. Customary
- Supports any modeling scale
- Fast and efficient
Read full descriptionHide full description
Instant scale conversion tool for any modeling scale. Fast, easy and efficient scale model conversion. Quickly convert U.S. Customary and Metric measurements into any scale. Perfect for all scale modelers, railroad modelers and tabletop gamers.
Spoolstock
Manage your 3D printing materials and projects with this app. Track filament inventory, monitor print progress, and gain insights into your usage. Syncs across devices and offers smart tracking for remaining filament.
- Filament inventory management
- QR/barcode scanning
- Intelligent filament tracking
- Multi-material print tracking
- Depletion notifications
- Usage statistics
- Multi-device cloud syncing
Read full descriptionHide full description
If you are 3D printing, either professionally or personally, you have to manage your progress and your materials. Spoolstock helps you keep track of what you have, what you use, what you like, and what you spend. Keep all your materials and prints in one place, on your phone or your tablet. ------------- You can start today for free for up to 20 filaments, spools, and prints. If you find Spoolstock useful in your 3D printing process, upgrade to a Maker subscription for unlimited access to filaments, spools, prints, and much more! ------------- Comprehensive filament inventory management: Easily track your filament inventory with detailed data points. Use QR/barcode scanning for quick access, add photos, note purchase prices, and customize inventory locations and attributes. Intelligent filament tracking: Know exactly how much filament is left on each spool. Spoolstock's smart system calculates remaining filament using an extensive database of empty spool weights. Enhanced print tracking: Monitor your 3D prints with precision. Spoolstock supports multi-material prints and automatically updates filament availability based on usage during prints. Depletion notifications: Stay informed with notifications when a filament spool is running low or has been depleted. Usage statistics: Gain insights into your printing habits with stats on filament types, brands, colors, and materials used. Flexible workflow integration: Designed to adapt to various workflows, Spoolstock is the perfect companion for both hobbyists and professional 3D printing setups. Multi-device cloud syncing: All data is associated with your Spoolstock account and is always up-to-date. Your data is stored in the cloud and can be accessed from anywhere on any device. Customized label printing: Build a print queue and print labels for your spools quickly and easily. QR codes on every spool for quick scanning and easy access. Supports most wi-fi enabled label printers. NEW! Keep track of your spools with custom NFC tags: Easily tap to find your spools. ------------- We are a small development team passionate about 3D printing. Our goal is to make Spoolstock the best possible platform to manage your 3D printing workflow so you can optimize your processes and increase your productivity. We are brand new, but have big plans for future updates and features. Stay tuned as this tool continues to grow and change as we work together with our users to provide regular updates and new features. Privacy Policy: https://spoolstock.com/privacy EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Terms of Use: https://spoolstock.com/terms
Screenshots
Verdict
The clearest difference is rating: Spoolstock at 4.5 against Model Scaler's 2.9. Spoolstock also leads on update cadence (weekly vs every 6 months) and ratings volume (120 vs 12). Model Scaler's advantage is in-app purchases (none vs 2) and iOS requirement (9.0 vs 15.0.0). On price, review sentiment, 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. Spoolstock sells 2 in-app purchases, starting at $1.99 per month. Model Scaler asks for nothing beyond the download.
Spoolstock holds the better App Store score, 4.5 against 2.9. That said, the two scores are not equally well evidenced: Spoolstock has 120 ratings behind it against 12, so its average is the more settled of the two. Written reviews point the same way: 40% of Model Scaler's written reviews are positive against 47% of Spoolstock's.
Model Scaler ships an update every 6 months, Spoolstock weekly. The most recent releases landed on November 1, 2026 and November 4, 2026 respectively.
| Parameter | Model Scaler | Spoolstock |
|---|---|---|
| Price | Free | Free |
| Rating | 2.9 (12 ratings) | 4.5 (120 ratings) — better |
| Positive reviews | 40.0% of reviews | 47.1% of reviews — better |
| Number of ratings | 12 | 120 — better |
| Update frequency | Every 6 months | Weekly — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free — better | Freemium |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 9.0 — better | 15.0.0 |
| Further details — not scored | ||
| Size | 11 MB | 90 MB |
| Age rating | 4+ | 4+ |
| Developer | Woodland Scenics | Pixel Bus, LLC |
Customer experience
Model Scaler
Spoolstock
Bugs and requests
Model Scaler
Not enough reviews yet to summarise bugs or requests.
Spoolstock
Reported bugs
20 issues- Most filaments missing in database
- NFC does not work
- Log in and data GONE after update
- Password reset does nothing
- CSV export doesn't work
Show 15 moreShow fewer
- Barcode scanning broken
- App requires internet connection
- App crashes constantly
- App freezes and locks up
- Unable to print labels
- Scanning most spools turns up no previous entries
- App crashes when navigating menus or returning from printing
- White screen displayed with nothing on it
- Login screen covered by Dynamic Island
- Cannot copy-paste passwords
- Selection of diameter 1.75 impossible
- Cannot enter started spools
- Long save times
- App not adapted to display size
- Inconsistent language (German/English)
Requested features
9 requests- Link app to slicer for project import
- One-time payment option instead of subscription
- Show total print time for a project
- Allow offline use
- Document filament drying
Show 4 moreShow fewer
- Overall overview of filament needing drying
- Improve UI for scrolling on inventory page
- Add more filament types to database
- Integration options for slicers
In-app purchases
Model Scaler
No in-app purchases
Spoolstock
- Maker Monthly$1.991 Month
- Maker Yearly$19.991 Year









