# Houstudia Calculator vs Vault Pro

The clearest difference is in-app purchases: Houstudia Calculator at none against Vault Pro's 1. Vault Pro's advantage is update cadence (every 3 days vs every 2 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Vault Pro sells 1 one-off in-app purchase. Houstudia Calculator asks for nothing beyond the download.

Houstudia Calculator ships an update every 2 months, Vault Pro every 3 days. The most recent releases landed on October 28, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Houstudia Calculator | Vault Pro |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 days** |
| Size | 20 MB | 49 MB |
| Requires iOS | **15.1** | 16.4 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 12+ | 4+ |
| Developer | [Houstudia](https://appshunter.io/developer/1848855363) | [Erwin Agpasa](https://appshunter.io/developer/6807016791) |

## What reviewers say

### Houstudia Calculator

[App page](https://appshunter.io/ios/app/houstudia-calculator/id6754558086)

**Features:** macOS Compatibility

**In-app purchases:** none


### Vault Pro

[App page](https://appshunter.io/ios/app/vault-pro-password-manager/id6818658562)

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Vault Pro Unlock | $2.99 | one-time |


## Frequently asked questions

### Is Houstudia Calculator free?

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

### Is Vault Pro free?

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

### Do Houstudia Calculator or Vault Pro have ads?

Neither Houstudia Calculator nor Vault Pro shows ads.

### Which is updated more often, Houstudia Calculator or Vault Pro?

Houstudia Calculator ships an update every 2 months, and Vault Pro every 3 days. Most recently, Houstudia Calculator was updated on October 28, 2026 and Vault Pro on October 24, 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.*