ExtCalc vs CTviewer+
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
ExtCalc
This scientific calculator offers a colorized text view for formulas, allowing for individual calculation sheets and easy memorization of results. It features a customizable constants pool, VAT calculator, and cloud synchronization for seamless use across devices. Accessibility and team collaboration are also emphasized.
- Colorized formula view
- Individual calculation sheets
- Memorize results
- Customizable constants pool
- VAT calculator
- Cloud synchronization
- Apple Watch app
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ExtCalc is an innovative scientific calculator that makes operating computations easy. It shows your whole formula in a colorised text view. You can have different calculation sheets for different formulas or you just use one sheet for all your formulas. Deletion and memorizing results are integrated as well. Last, but not least, it includes a customizable constants pool and a VAT calculator. All nifty features in a short list: * Individual calculation sheets, with the possibility to print them * Color highlighting * Memorizing results, e.g. via the ANS button and through the calculation sheets, get old values by tapping on them in the sheet * Many functions, even in portrait mode * Grouping (brackets) * Error proof, you can't input formulas that would lead to errors * Constants pool, easily customizable * iCloud support for synchronization between devices * VAT calculator * Apple Watch app * Cloud synchronisation to stay up-to-date on all devices * AR scene * Print calculation sheets * Dark Mode * Strong focus on accessibility * SharePlay to work in a team Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy: https://develicious-studios.de/privacy.html
CTviewer+
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The CTviewer+ app is designed to work with CTVision AI-series NVRs, IP cameras, and Smart Doorbells. It allows you to access live view of your cameras remotely. Utilizing the P2P cloud function, you can view real-time video feeds from anywhere in the world with internet connection. It also allows you to play back recorded video and manage configurations on the device. When an AI detection alarm is triggered, you are able to receive instant push notification from this app.
Screenshots
Verdict
The clearest difference is in-app purchases: CTviewer+ at none against ExtCalc's 2. CTviewer+ also leads on iOS requirement (13.0 vs 18.7). ExtCalc's advantage is device support (6 vs 3). On price and ads there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. ExtCalc sells 2 in-app purchases, starting at $4.99 per year. CTviewer+ asks for nothing beyond the download.
| Parameter | ExtCalc | CTviewer+ |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | โ |
| Update frequency | Every 5 months | โ |
| Ads | No | No |
| In-app purchases | Yes | No โ better |
| Monetization | Free with in-app purchases | โ |
| Devices | iPhone, iPad, Mac, Apple TV, Apple Watch, Vision Pro โ better | iPhone, iPad, iPod |
| Requires iOS | 18.7 | 13.0 โ better |
| Further details โ not scored | ||
| Size | 7 MB | 217 MB |
| Age rating | 4+ | 4+ |
| Developer | Matthias Weber | YU BO HAN |
In-app purchases
ExtCalc
- Yearly Subscription$4.991 Year
- Printing$0.99
CTviewer+
No in-app purchases









