# RedCrab Calculator vs Zero Issues

The clearest difference is ads: Zero Issues at none against RedCrab Calculator's shown. RedCrab Calculator's advantage is monetization model (free with in-app purchases vs paid) and iOS requirement (15.6 vs 17.0). On price, review sentiment, in-app purchases and device support there is nothing between them.

Both are free to download. RedCrab Calculator sells 1 one-off in-app purchase and Zero Issues sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

## The numbers

| Metric | RedCrab Calculator | Zero Issues |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/zero-issues/id6446958906/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Fortnightly | — |
| Monetization | **Free with in-app purchases** | Paid |
| Size | 5 MB | 5 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) | [Gryzle LLC](https://appshunter.io/developer/1533543861) |

## 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 |


### Zero Issues

[App page](https://appshunter.io/ios/app/zero-issues/id6446958906)

This customizable task organizer helps users manage to-do lists with intuitive sorting and filtering. It allows for deep personalization of lists, tags, and tasks, aiming to be a comprehensive solution for organizing daily activities.

**Highlights:** Intuitive organization, Easy sorting and filtering, Customizable lists and tags, Task management, One-stop shop for organizing

**Features:** Family Sharing

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Zero Issues - Full Experience | $2.99 | one-time |


## Frequently asked questions

### Is RedCrab Calculator free?

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

### Is Zero Issues free?

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

### Do RedCrab Calculator or Zero Issues have ads?

RedCrab Calculator shows ads; Zero Issues does not.

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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.*