# Spool vs Sol Clock

Spool and Sol Clock are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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 3 weeks, Sol Clock every 11 days. Both last shipped on November 5, 2026.

## The numbers

| Metric | Spool | Sol Clock |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/spool-filament-tracker/id6756892049/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 11 days** |
| Monetization | Freemium | — |
| Size | 81 MB | 8 MB |
| Requires iOS | 26.1 | **26.0** |
| Devices | **iPhone, iPad, Mac** | 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

**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-sun-and-moon-tracker/id6770347619)

**Features:** macOS Compatibility, Vision Pro support, iPhone Duo 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 3 weeks, and Sol Clock every 11 days. Most recently, Spool was updated on November 5, 2026 and Sol Clock on November 5, 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.*