# Spool vs Sol Clock

The clearest difference is update cadence: Sol Clock at every 3 days against Spool's every 2 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Spool sells 3 in-app purchases, starting at $4.99 per month and Sol Clock sells 2 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Spool ships an update every 2 weeks, Sol Clock every 3 days. The most recent releases landed on July 24, 2026 and September 11, 2026 respectively.

## The numbers

| Metric | Spool | Sol Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/spool-filament-tracker/id6756892049/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Every 3 days** |
| Monetization | Freemium | — |
| Size | 76 MB | 8 MB |
| Requires iOS | 26.1 | **26.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Lucas Melo](https://appshunter.io/developer/1863471937) | [Mark Zigadlo](https://appshunter.io/developer/1879779038) |

## What reviewers say

### Spool

[App page](https://appshunter.io/ios/app/spool-filament-tracker/id6756892049)

Manage your 3D printing filament inventory with detailed tracking of materials, costs, and stock levels. Log print details, monitor printer maintenance, and gain insights into your printing habits. Integrates with Bambu Lab printers for automatic data logging.

**Highlights:** Filament spool tracking, Cost and weight logging, Low-stock warnings, Print logging and analysis, Bambu Lab printer integration, Printer maintenance schedules, NFC/QR code spool tagging

**Features:** macOS Compatibility

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Spool Pro Monthly | $4.99 | per month |
| Spool Pro Yearly | $49.99 | per year |
| +10 Spool Capacity | $0.99 | one-time |


### Sol Clock

[App page](https://appshunter.io/ios/app/sol-clock/id6770347619)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Monthly | $0.99 | per month |
| Pro Annual | $7.99 | per year |


## Frequently asked questions

### Is Spool free?

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

### Is Sol Clock free?

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

### Do Spool or Sol Clock have ads?

Neither Spool nor Sol Clock shows ads.

### Which is updated more often, Spool or Sol Clock?

Spool ships an update every 2 weeks, and Sol Clock every 3 days. Most recently, Spool was updated on July 24, 2026 and Sol Clock on September 11, 2026.

---

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