# Rock Lock vs CalcGate | App Lock with Math

The clearest difference is in-app purchases: CalcGate | App Lock with Math at none against Rock Lock's 2. Rock Lock's advantage is iOS requirement (17.0 vs 26.2). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Rock Lock sells 1 one-off in-app purchase. CalcGate | App Lock with Math asks for nothing beyond the download.

Rock Lock ships an update fortnightly, CalcGate | App Lock with Math every 3 weeks. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Rock Lock | CalcGate | App Lock with Math |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 weeks |
| Size | 12 MB | 4 MB |
| Requires iOS | **17.0** | 26.2 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Ron Yahav](https://appshunter.io/developer/1879738117) | [HIDEYUKI INAGAKI](https://appshunter.io/developer/1819355611) |

## What reviewers say

### Rock Lock

[App page](https://appshunter.io/ios/app/rock-lock-app-blocker/id6760949840)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Rock Lock Pro | $2.99 | one-time |


### CalcGate | App Lock with Math

[App page](https://appshunter.io/ios/app/calcgate-app-lock-with-math/id6762510886)

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

**In-app purchases:** none


## Frequently asked questions

### Is Rock Lock free?

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

### Is CalcGate | App Lock with Math free?

CalcGate | App Lock with Math is free to download, with no in-app purchases.

### Do Rock Lock or CalcGate | App Lock with Math have ads?

Neither Rock Lock nor CalcGate | App Lock with Math shows ads.

### Which is updated more often, Rock Lock or CalcGate | App Lock with Math?

Rock Lock ships an update fortnightly, and CalcGate | App Lock with Math every 3 weeks. Most recently, Rock Lock was updated on October 20, 2026 and CalcGate | App Lock with Math on October 25, 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.*