Calculator ⁺⁻ vs QI Calculator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Calculator ⁺⁻
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.
- 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)
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Calculator for iPad and iPhone is an easy to use that includes both a standard and scientific calculator. Calculator app allows you to: • Customize the look of the application by changing the color • Choose between a basic calculator or scientific calculator with more than 30 scientific operations • View history of your calculations on the History Tab • View an equation of your current calculations • Calculate with accuracy to more than 75 significant digits • Use parenthesis and nested parenthesis in your calculations • Change button touch sound with vibration • Displays real time calculation
QI Calculator
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1. A calculator that fully conforms to handwriting habits, so you no longer need to master different input methods for calculating data 2. There may be some imperfections, but everyone can provide valuable feedback on the premise of promising not to require fees. 3. Pay attention to the use of the cursor 4. Terms of Use (EULA):https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ 5.Privacy Policy:http://www.iphonesir.com/privacypolicy.html
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Calculator ⁺⁻ | QI Calculator |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (42 ratings) — better | — |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 42 — better | — |
| Update frequency | Every 15 months | Every 3 weeks — better |
| Ads | Yes | No — better |
| In-app purchases | No — better | Yes |
| Monetization | Ad-supported | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 | 15.0 |
| Further details — not scored | ||
| Size | 4 MB | 129 MB |
| Age rating | 4+ | 4+ |
| Developer | Matrix Software Co. | shouhui qi |
In-app purchases
Calculator ⁺⁻
No in-app purchases
QI Calculator
- Theme$0.99
- Theme Blue Sky$0.99
Questions
Is Calculator ⁺⁻ free?
Is QI Calculator free?
Do Calculator ⁺⁻ or QI Calculator have ads?
Which is updated more often, Calculator ⁺⁻ or QI Calculator?
Other comparisons
