invsi vs Calc Ultra
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
invsi
This app helps parents manage their children's device usage by controlling screen time and blocking inappropriate content. It offers a local-only experience with no ads or registration, prioritizing user privacy.
- Screen time management
- Content blocking
- No advertisements
- Local data storage
- No registration required
- Premium features via subscription
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invsi helps you keep photos, videos, and files private. You can also lock apps. When you lend someone your phone, you decide what they can access. 【Private Space】 Import the photos, videos, and files you want to protect, then enter your passcode to view them. Choose from different ways to keep your content private. 【App Lock】 Lock selected apps whenever you need to, or set a timer to unlock them automatically. When your child uses your phone, you can restrict access to games and other apps and block inappropriate content. 【Our Philosophy】 No ads. No notifications. No sign-up required. All your data stays on your phone. Please back up anything important. Less is more. --- Privacy --- invsi runs locally on your device. We have no servers and cannot upload your personal data. This also means we cannot recover your passcode, so please keep it safe. --- Contact --- We welcome your suggestions and feedback. Email: invisilab@gmail.com Xiaohongshu: 独库车神 X(twitter):@invisilab_x --- Subscriptions --- - Basic features are free to use. - Become an invsi member to unlock all premium features. - Payment will be charged to your Apple Account when you confirm your purchase. - Subscriptions renew automatically unless you turn off auto-renewal at least 24 hours before the current billing period ends. - You can manage or cancel your subscription at any time after purchase in Settings → your name → Subscriptions. ---Additional Information--- Privacy Policy: https://maxc.cc/privacy-policy/ Terms of Use: https://maxc.cc/user-agreement/
Calc Ultra
This comprehensive utility app offers a suite of powerful calculation and conversion tools. It includes a voice calculator, customizable toolkits, health index tracking, and essential measurement instruments like rulers and compasses.
- Voice calculator for complex math
- Customizable calculation tool store
- Health index tracking
- Ruler, protractor, and level tools
- Compass and speedometer
- Date and unit converters
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Introducing the brand new, upgraded super app— the ultimate solution to all your calculations and conversion problems! 【Voice Calculator】 Whether it's for work, study, or daily needs, complicated calculations are easily handled. Intelligent, fast, professional, one-click solution to math problems. 【Calculation App Store】 Create your exclusive calculation toolbox, with all types of calculation tools you need readily available, to customize your personal calculation experience. 【Health Index Calculation】 Comprehensive health data management. Track and control your health index, make smart decisions, and live a stronger life. 【Ruler & Protractor & Level】 Complete measurement tools allow you to measure accurately anytime, anywhere. Say goodbye to traditional complexities, easy measurement is in your hands. 【Compass & Speedometer】 Fearless exploration and travel. With our app, you can accurately master your direction even in unfamiliar environments, fear nothing. 【Conversion Tools】 All kinds of conversions are readily available. Whether it's date calculations, or other types of conversions, we can provide you with efficient solutions. Download this all-in-one calculation toolbox now, make your life smarter, more efficient, and convenient! (。◕ ∀ ◕。)ノ゙
Screenshots
Verdict
The clearest difference is price: invsi at Free against Calc Ultra's $9.99. Calc Ultra's advantage is rating (5.0 vs 4.1) and update cadence (every 2 days vs every 3 weeks). On review sentiment, ratings volume, ads and in-app purchases 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
invsi is free to download; Calc Ultra costs $9.99 up front. invsi sells 4 in-app purchases, starting at $0.99 per month and Calc Ultra sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
Calc Ultra holds the better App Store score, 5.0 against 4.1. Both are backed by a comparable volume of ratings — 8 and 4 respectively. Written reviews point the same way: 96% of invsi's written reviews are positive against 100% of Calc Ultra's.
invsi ships an update every 3 weeks, Calc Ultra every 2 days. The most recent releases landed on October 22, 2026 and October 7, 2026 respectively.
| Parameter | invsi | Calc Ultra |
|---|---|---|
| Price | Free — better | $9.99 |
| Rating | 4.1 (8 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 96.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 8 — better | 4 |
| Update frequency | Every 3 weeks | Every 2 days — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Freemium — better | Paid |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 17.0 | 14.0 — better |
| Further details — not scored | ||
| Size | 26 MB | 10 MB |
| Age rating | 4+ | 17+ |
| Developer | 新坤 杨 | 小飞 刘 |
Customer experience
invsi
Calc Ultra
In-app purchases
invsi
- Monthly PRO3 Days trial$0.991 Month
- Invsi PRO (Annual)7 Days trial$4.991 Year
- Unlock Application Icon$0.99
- Lifetime PRO$14.99
Calc Ultra
- Support A Cup Of Coffee$2.99








