# Model Scaler vs Spoolstock

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.

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.

## The numbers

| Metric | Model Scaler | Spoolstock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.9 (12 ratings)](https://appshunter.io/ios/app/model-scaler/id528641484/reviews) | **[4.5 (120 ratings)](https://appshunter.io/ios/app/spoolstock-3d-printing-hub/id6480470069/reviews)** |
| Number of ratings | 12 | **120** |
| Positive reviews | 40.0% of reviews | **47.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Weekly** |
| Monetization | **Free** | Freemium |
| Size | 11 MB | 90 MB |
| Requires iOS | **9.0** | 15.0.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Woodland Scenics](https://appshunter.io/developer/528641487) | [Pixel Bus, LLC](https://appshunter.io/developer/1473462961) |

## What reviewers say

### Model Scaler

[App page](https://appshunter.io/ios/app/model-scaler/id528641484)

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.

**Highlights:** Instant scale conversion, U.S. Customary to Metric, Metric to U.S. Customary, Supports any modeling scale, Fast and efficient

**Features:** macOS Compatibility

**In-app purchases:** none


### Spoolstock

[App page](https://appshunter.io/ios/app/spoolstock-3d-printing-hub/id6480470069)

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.

**Highlights:** Filament inventory management, QR/barcode scanning, Intelligent filament tracking, Multi-material print tracking, Depletion notifications, Usage statistics, Multi-device cloud syncing

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Maker Monthly | $1.99 | per month |
| Maker Yearly | $19.99 | per year |

**What reviewers like**

- 👍 Great for filament inventory
- 👍 Tracks filament usage
- 👍 Helps manage large spool collections
- 👍 Time-saver for organization
- 👍 Useful for accounting/cost tracking

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 Login issues/data loss
- 🐛 NFC scanning not working
- 🐛 Barcode/QR code scanning issues
- 🐛 Filament database lacking entries

**Reported bugs**

- 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

**Requested features**

- 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


## Frequently asked questions

### Is Model Scaler free?

Model Scaler is free to download, with no in-app purchases.

### Is Spoolstock free?

Spoolstock is free to download, with in-app purchases available.

### Which has better reviews, Model Scaler or Spoolstock?

Spoolstock is rated higher. Model Scaler averages 2.9 out of 5 from 12 ratings, while Spoolstock averages 4.5 from 120 ratings.

### Do Model Scaler or Spoolstock have ads?

Neither Model Scaler nor Spoolstock shows ads.

### Which is updated more often, Model Scaler or Spoolstock?

Model Scaler ships an update every 6 months, and Spoolstock weekly. Most recently, Model Scaler was updated on November 1, 2026 and Spoolstock on November 4, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*