QI Calculator vs ToolsUnitConverter
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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
ToolsUnitConverter
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主要功能： 1.科学计算器 2.单位转换器:支持长度、重量、温度 3.json格式优化
Screenshots
Verdict
The clearest difference is in-app purchases: ToolsUnitConverter at none against QI Calculator's 2. ToolsUnitConverter also leads on update cadence (every 5 days vs every 3 weeks). On price, ads, 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. ToolsUnitConverter asks for nothing beyond the download.
QI Calculator ships an update every 3 weeks, ToolsUnitConverter every 5 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | QI Calculator | ToolsUnitConverter |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 129 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | shouhui qi | 成 熊 |
In-app purchases
QI Calculator
- Theme$0.99
- Theme Blue Sky$0.99
ToolsUnitConverter
No in-app purchases
Questions
Is QI Calculator free?
Is ToolsUnitConverter free?
Do QI Calculator or ToolsUnitConverter have ads?
Which is updated more often, QI Calculator or ToolsUnitConverter?
Other comparisons
