# SmartCalc+ Science Calculator vs calculator DUO

The clearest difference is update cadence: calculator DUO at every 10 days against SmartCalc+ Science Calculator's every 5 weeks. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. SmartCalc+ Science Calculator sells 2 in-app purchases, starting at $0.99 per 7 days and calculator DUO sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

SmartCalc+ Science Calculator ships an update every 5 weeks, calculator DUO every 10 days. Both last shipped on November 4, 2026.

## The numbers

| Metric | SmartCalc+ Science Calculator | calculator DUO |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/calculator-duo/id6739860116/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 weeks | **Every 10 days** |
| Monetization | — | Free with in-app purchases |
| Size | 9 MB | 18 MB |
| Requires iOS | 16.6 | **16.5** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Retenica SP Z.O.O](https://appshunter.io/developer/1715674718) | [Wenbin lei](https://appshunter.io/developer/1787331500) |

## What reviewers say

### SmartCalc+ Science Calculator

[App page](https://appshunter.io/ios/app/smartcalc-plus-science-calculator/id6483847331)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Access | $0.99 | per 7 days |
| Annual Premium Access | $9.99 | per year |


### calculator DUO

[App page](https://appshunter.io/ios/app/calculator-duo/id6739860116)

This utility app allows for comfortable one-handed calculations by letting you reposition the keypad. It also provides features to save and reuse past answers, correct input with a swipe, and handle both everyday and scientific calculations, including date and time functions.

**Highlights:** One-handed keypad repositioning, Save and reuse past answers, Swipe to delete/correct input, Everyday and scientific functions, Date and time calculations, Customizable themes and display

**Features:** Vision Pro support, iPhone Duo support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $1.99 | one-time |


## Frequently asked questions

### Is SmartCalc+ Science Calculator free?

SmartCalc+ Science Calculator is free to download, with in-app purchases available.

### Is calculator DUO free?

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

### Do SmartCalc+ Science Calculator or calculator DUO have ads?

Both SmartCalc+ Science Calculator and calculator DUO show ads.

### Which is updated more often, SmartCalc+ Science Calculator or calculator DUO?

SmartCalc+ Science Calculator ships an update every 5 weeks, and calculator DUO every 10 days. Most recently, SmartCalc+ Science Calculator was updated on November 4, 2026 and calculator DUO on November 4, 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.*