# iwFLOW vs Spool Master

The clearest difference is in-app purchases: iwFLOW at none against Spool Master's 2. iwFLOW also leads on ads (none vs shown). Spool Master's advantage is update cadence (every 5 days vs every 3 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. Spool Master sells 2 in-app purchases, starting at $1.99 per month. iwFLOW asks for nothing beyond the download.

iwFLOW ships an update every 3 months, Spool Master every 5 days. The most recent releases landed on November 7, 2026 and November 9, 2026 respectively.

## The numbers

| Metric | iwFLOW | Spool Master |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/spool-master/id6757678949/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 5 days** |
| Monetization | — | Free with in-app purchases |
| Size | 2 MB | 34 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Impuls digital](https://appshunter.io/developer/1551772677) | [Sebastien Girod](https://appshunter.io/developer/1472154080) |

## What reviewers say

### iwFLOW

[App page](https://appshunter.io/ios/app/iwflow/id1562096191)

**Features:** macOS Compatibility

**In-app purchases:** none


### Spool Master

[App page](https://appshunter.io/ios/app/spool-master/id6757678949)

Manage your 3D printing filament stock with NFC scanning, inventory tracking, and smart shopping lists. Optimize filament usage, reduce waste, and control expenses with detailed statistics and print settings.

**Highlights:** NFC reading and writing for spools, Complete inventory management, Detailed statistics and value tracking, Automatic low stock alerts, Smart shopping list generation, Print settings management, Multi-device synchronization

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spool Master Monthly | $1.99 | per month |
| Spool Master Yearly | $9.99 | per year |


## Frequently asked questions

### Is iwFLOW free?

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

### Is Spool Master free?

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

### Do iwFLOW or Spool Master have ads?

Spool Master shows ads; iwFLOW does not.

### Which is updated more often, iwFLOW or Spool Master?

iwFLOW ships an update every 3 months, and Spool Master every 5 days. Most recently, iwFLOW was updated on November 7, 2026 and Spool Master on November 9, 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.*