# calculator HD⁻ vs Redroad

The clearest difference is review sentiment: calculator HD⁻ at 61% against Redroad's 0%. Redroad's advantage is in-app purchases (none vs 6) and ads (none vs shown). On price, update cadence and device support there is nothing between them.

Both are free to download. calculator HD⁻ sells 6 in-app purchases, starting at $2.99 per 3 months. Redroad asks for nothing beyond the download.

calculator HD⁻ ships an update every 6 weeks, Redroad every 5 weeks. The most recent releases landed on September 29, 2026 and August 29, 2026 respectively.

## The numbers

| Metric | calculator HD⁻ | Redroad |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2.5K ratings)](https://appshunter.io/ios/app/calculator-hd/id1485888099/reviews)** | — |
| Number of ratings | **2.5K** | — |
| Positive reviews | **61.1% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 6 weeks | **Every 5 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 97 MB | 82 MB |
| Requires iOS | 13.0 | **11.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Beijing four time ledo Technology Co., Ltd.](https://appshunter.io/developer/1485888098) | [深圳市杉川机器人有限公司](https://appshunter.io/developer/1232160765) |

## What reviewers say

### calculator HD⁻

[App page](https://appshunter.io/ios/app/calculator-hd/id1485888099)

A powerful and intuitive calculator app designed for simplicity and beauty. It offers a complete record of operations that can be reviewed and edited, along with scientific functions and multiple themes. Enjoy enhanced functionality with an optional subscription.

**Highlights:** Records operation process, Check and edit operations, Elegant and intuitive interface, Displays equation and result simultaneously, Supports scientific functions, Multiple themes

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| auto season vip | $2.99 | per 3 months |
| 连续年会员 | $3.99 | per year |
| 深色主题 | $0.99 | one-time |
| 周会员 | $0.99 | one-time |
| 高级会员 | $14.99 | one-time |
| 超级会员 | $14.99 | one-time |

**What reviewers like**

- 👍 Good calculator
- 🚀 Efficient calculations

**What reviewers complain about**

- 💰 Paid features
- 🔒 Locked to one device
- 🐛 Calculation errors
- 🙅‍♀️ Lack of functionality

**Reported bugs**

- Incorrect calculation results
- Compatibility issues with new devices

**Requested features**

- More customization options
- Improved user interface
- Free version without ads


### Redroad

[App page](https://appshunter.io/ios/app/redroad/id1623740139)

Take full command of your robot vacuum. Map your home, set custom cleaning schedules, and define specific zones for targeted cleaning. Optimize cleaning strength and modes for different areas and household needs.

**Highlights:** Smart home mapping, Customizable cleaning schedules, Adjustable cleaning strength, Zone cleaning functionality, Multi-level map saving, Intelligent and free control modes

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is calculator HD⁻ free?

calculator HD⁻ is free to download, with in-app purchases available.

### Is Redroad free?

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

### Do calculator HD⁻ or Redroad have ads?

calculator HD⁻ shows ads; Redroad does not.

### Which is updated more often, calculator HD⁻ or Redroad?

calculator HD⁻ ships an update every 6 weeks, and Redroad every 5 weeks. Most recently, calculator HD⁻ was updated on September 29, 2026 and Redroad on August 29, 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.*