Comparison

invsi vs Calc Ultra

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • Screen time management
  • Content blocking
  • No advertisements
  • Local data storage
  • No registration required
  • Premium features via subscription
Features
Read full description

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/

About

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.

Highlights
  • Voice calculator for complex math
  • Customizable calculation tool store
  • Health index tracking
  • Ruler, protractor, and level tools
  • Compass and speedometer
  • Date and unit converters
Features
Read full description

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

invsi4 screens
Calc Ultra4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
invsi versus Calc Ultra: the parameters behind the verdict, then further details
ParameterinvsiCalc Ultra
PriceFree — better$9.99
Rating4.1 (8 ratings)5.0 (4 ratings) — better
Positive reviews96.0% of reviews100.0% of reviews — better
Number of ratings8 — better4
Update frequencyEvery 3 weeksEvery 2 days — better
AdsNoNo
In-app purchasesYesYes
MonetizationFreemium — betterPaid
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS17.014.0 — better
Further details — not scored
Size26 MB10 MB
Age rating4+17+
Developer新坤 杨小飞 刘

Customer experience

invsi

All ratings8 ratings
Positive75.0%
Neutral0.0%
Negative25.0%
Written reviews25 reviews
Positive96.0%
Neutral4.0%
Negative0.0%

Calc Ultra

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

invsi

Subscriptions2
  • Monthly PRO3 Days trial$0.991 Month
  • Invsi PRO (Annual)7 Days trial$4.991 Year
One-time2
  • Unlock Application Icon$0.99
  • Lifetime PRO$14.99
1 purchases

Calc Ultra

One-time1
  • Support A Cup Of Coffee$2.99

Questions

Is invsi free?
invsi is free to download, with in-app purchases available.
Is Calc Ultra free?
Calc Ultra costs $9.99, and also offers in-app purchases.
Which has better reviews, invsi or Calc Ultra?
Calc Ultra is rated higher. invsi averages 4.1 out of 5 from 8 ratings, while Calc Ultra averages 5.0 from 4 ratings.
Do invsi or Calc Ultra have ads?
Neither invsi nor Calc Ultra shows ads.
Which is updated more often, invsi or Calc Ultra?
invsi ships an update every 3 weeks, and Calc Ultra every 2 days. Most recently, invsi was updated on October 22, 2026 and Calc Ultra on October 7, 2026.

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