# Calculator ⁺⁻ vs QI Calculator

The clearest difference is in-app purchases: Calculator ⁺⁻ at none against QI Calculator's 2. QI Calculator's advantage is ads (none vs shown) and update cadence (every 3 weeks vs every 15 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. QI Calculator sells 2 one-off in-app purchases. Calculator ⁺⁻ asks for nothing beyond the download.

Calculator ⁺⁻ ships an update every 15 months, QI Calculator every 3 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Calculator ⁺⁻ | QI Calculator |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (42 ratings)](https://appshunter.io/ios/app/calculator/id6443813573/reviews)** | — |
| Number of ratings | **42** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 15 months | **Every 3 weeks** |
| Monetization | Ad-supported | — |
| Size | 4 MB | 129 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Matrix Software Co.](https://appshunter.io/developer/1457004046) | [shouhui qi](https://appshunter.io/developer/1185710456) |

## What reviewers say

### Calculator ⁺⁻

[App page](https://appshunter.io/ios/app/calculator/id6443813573)

This app offers both basic and scientific calculation functions for iPhone and iPad. Users can customize its appearance, view calculation history, and perform complex equations with high accuracy. It also provides real-time calculation display and adjustable touch feedback.

**Highlights:** Basic and scientific calculator modes, Over 30 scientific operations, Calculation history view, Real-time calculation display, Customizable color themes, Adjustable button touch sound/vibration, High accuracy calculations (75+ significant digits)

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

**In-app purchases:** none


### QI Calculator

[App page](https://appshunter.io/ios/app/qi-calculator/id6476379861)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Theme | $0.99 | one-time |
| Theme Blue Sky | $0.99 | one-time |


## Frequently asked questions

### Is Calculator ⁺⁻ free?

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

### Is QI Calculator free?

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

### Do Calculator ⁺⁻ or QI Calculator have ads?

Calculator ⁺⁻ shows ads; QI Calculator does not.

### Which is updated more often, Calculator ⁺⁻ or QI Calculator?

Calculator ⁺⁻ ships an update every 15 months, and QI Calculator every 3 weeks. Most recently, Calculator ⁺⁻ was updated on October 24, 2026 and QI Calculator 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.*