# RedCrab Calculator vs MaxPassword

The clearest difference is in-app purchases: MaxPassword at none against RedCrab Calculator's 1. MaxPassword also leads on ads (none vs shown) and update cadence (every 3 days vs fortnightly). RedCrab Calculator's advantage is iOS requirement (15.6 vs 17.0). On price, review sentiment and device support there is nothing between them.

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

RedCrab Calculator ships an update fortnightly, MaxPassword every 3 days. The most recent releases landed on October 29, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | RedCrab Calculator | MaxPassword |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/maxpassword-secure-vault/id6780723414/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 5 MB | 1 MB |
| Requires iOS | **15.6** | 17.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [少泽 梁](https://appshunter.io/developer/897112791) | [Krishna Tadi](https://appshunter.io/developer/6780723416) |

## What reviewers say

### RedCrab Calculator

[App page](https://appshunter.io/ios/app/redcrab-calculator/id947845140)

This powerful scientific calculator offers a modern UI and robust engine for users of all levels. It handles basic arithmetic to complex engineering equations with smart expression parsing and a high-precision display. Enjoy a seamless calculation experience with features like history recall and dark mode.

**Highlights:** Basic & Advanced Calculations, Smart Expression Parsing, Calculation History & Reuse, High-Precision Display, Dark Mode & Modern UI, VIP Ad-Free Experience

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 终身会员 | $1.99 | one-time |


### MaxPassword

[App page](https://appshunter.io/ios/app/maxpassword-secure-vault/id6780723414)

Securely store and manage all your login credentials with end-to-end encryption. Generate strong passwords, add custom fields, and sync your encrypted vault across devices via your own Google Drive. Enjoy a private and user-friendly experience with no tracking or ads.

**Highlights:** End-to-end encryption, Store usernames, passwords, and notes, Custom fields, Password generator, Google Drive sync, Biometric unlock (Face ID, Touch ID)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is RedCrab Calculator free?

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

### Is MaxPassword free?

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

### Do RedCrab Calculator or MaxPassword have ads?

RedCrab Calculator shows ads; MaxPassword does not.

### Which is updated more often, RedCrab Calculator or MaxPassword?

RedCrab Calculator ships an update fortnightly, and MaxPassword every 3 days. Most recently, RedCrab Calculator was updated on October 29, 2026 and MaxPassword on October 28, 2026.

---

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