# Calctan vs invsi

The clearest difference is review sentiment: invsi at 100% against Calctan's 29%. invsi also leads on ads (none vs shown) and update cadence (fortnightly vs every 3 months). Calctan's advantage is rating (4.5 vs 4.1) and ratings volume (61 vs 8). On price, in-app purchases, monetization model and device support there is nothing between them.

Both are free to download. Calctan sells 1 one-off in-app purchase and invsi sells 4 in-app purchases, starting at $0.99 per month. Whichever you choose, the download price is not the number that matters.

Calctan holds the better App Store score, 4.5 against 4.1. That said, the two scores are not equally well evidenced: Calctan has 61 ratings behind it against 8, so its average is the more settled of the two. Written reviews complicate that: 29% of Calctan's written reviews are positive against 100% of invsi's, so the app with the better star average is not the one people write more warmly about.

Calctan ships an update every 3 months, invsi fortnightly. The most recent releases landed on September 25, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Calctan | invsi |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (61 ratings)](https://appshunter.io/ios/app/calctan/id1445480535/reviews)** | [4.1 (8 ratings)](https://appshunter.io/ios/app/invsi/id6444667120/reviews) |
| Number of ratings | **61** | 8 |
| Positive reviews | 28.6% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 3 months | **Fortnightly** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 11 MB | 26 MB |
| Requires iOS | **16.6** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Jorge Lozada](https://appshunter.io/developer/421852863) | [新坤 杨](https://appshunter.io/developer/1655993145) |

## What reviewers say

### Calctan

[App page](https://appshunter.io/ios/app/calctan/id1445480535)

This sophisticated calculator app offers a minimalist design with advanced mathematical functions and extensive personalization options. It seamlessly syncs across devices and includes multitasking features for enhanced productivity.

**Highlights:** Intuitive minimalist design, 100+ customizable themes, 47 advanced mathematical functions, Automatic calculation history, iCloud sync across devices, Split Screen and Swipe Mode multitasking, Share calculations easily

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $9.99 | one-time |


### invsi

[App page](https://appshunter.io/ios/app/invsi/id6444667120)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Monthly PRO | $0.99 | per month |
| Invsi PRO (Annual) | $4.99 | per year |
| Unlock Application Icon | $0.99 | one-time |
| Lifetime PRO | $14.99 | one-time |


## Frequently asked questions

### Is Calctan free?

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

### Is invsi free?

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

### Which has better reviews, Calctan or invsi?

Calctan is rated higher. Calctan averages 4.5 out of 5 from 61 ratings, while invsi averages 4.1 from 8 ratings.

### Do Calctan or invsi have ads?

Calctan shows ads; invsi does not.

### Which is updated more often, Calctan or invsi?

Calctan ships an update every 3 months, and invsi fortnightly. Most recently, Calctan was updated on September 25, 2026 and invsi on October 8, 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.*