# GrindLab vs Caliburr

The clearest difference is in-app purchases: GrindLab at none against Caliburr's 2. Caliburr's advantage is iOS requirement (15.1 vs 26.0). On price, update cadence, ads and device support there is nothing between them.

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

GrindLab ships an update every 2 weeks, Caliburr fortnightly. The most recent releases landed on October 8, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | GrindLab | Caliburr |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 weeks | **Fortnightly** |
| Size | 32 MB | 49 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Nathan King](https://appshunter.io/developer/1846712227) | [Vellapps LLC](https://appshunter.io/developer/1365654150) |

## What reviewers say

### GrindLab

[App page](https://appshunter.io/ios/app/grindlab/id6754118114)

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

**In-app purchases:** none


### Caliburr

[App page](https://appshunter.io/ios/app/caliburr/id6761644774)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Caliburr Backer - Monthly | $1.99 | per month |
| Caliburr Backer - Annual | $14.99 | per year |


## Frequently asked questions

### Is GrindLab free?

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

### Is Caliburr free?

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

### Do GrindLab or Caliburr have ads?

Neither GrindLab nor Caliburr shows ads.

### Which is updated more often, GrindLab or Caliburr?

GrindLab ships an update every 2 weeks, and Caliburr fortnightly. Most recently, GrindLab was updated on October 8, 2026 and Caliburr on October 15, 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.*