# Advanced Calculator. HIgh vs Impossible Notes

The clearest difference is ads: Advanced Calculator. HIgh at none against Impossible Notes's shown. Impossible Notes's advantage is update cadence (every 2 weeks vs every 6 weeks) and iOS requirement (15.1 vs 26.0). On price, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Advanced Calculator. HIgh ships an update every 6 weeks, Impossible Notes every 2 weeks. The most recent releases landed on June 8, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Advanced Calculator. HIgh | Impossible Notes |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/advanced-calculator-high-tech/id6754898336/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 6 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 3 MB | 6 MB |
| Requires iOS | 26.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Martha G Korra](https://appshunter.io/developer/1850850935) | [Storq Labs BV](https://appshunter.io/developer/1864178327) |

## What reviewers say

### Advanced Calculator. HIgh

[App page](https://appshunter.io/ios/app/advanced-calculator-high-tech/id6754898336)

This app combines a basic, scientific, and graphing calculator with a unit converter. It offers advanced mathematical functions, equation plotting, and seamless unit conversions for various needs. Access your calculation history across all modes.

**Highlights:** Basic, Scientific, and Graphing Calculators, Advanced Mathematical Functions, Real-time Function Plotting, Smart Unit Converter (Length, Weight, Temp, Area, Volume), Calculation History, Customizable Expressions

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

**In-app purchases:** none


### Impossible Notes

[App page](https://appshunter.io/ios/app/impossible-notes/id6757008307)

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

**In-app purchases:** none


## Frequently asked questions

### Is Advanced Calculator. HIgh free?

Advanced Calculator. HIgh is free to download, with no in-app purchases.

### Is Impossible Notes free?

Impossible Notes is free to download, with no in-app purchases.

### Do Advanced Calculator. HIgh or Impossible Notes have ads?

Impossible Notes shows ads; Advanced Calculator. HIgh does not.

### Which is updated more often, Advanced Calculator. HIgh or Impossible Notes?

Advanced Calculator. HIgh ships an update every 6 weeks, and Impossible Notes every 2 weeks. Most recently, Advanced Calculator. HIgh was updated on June 8, 2026 and Impossible Notes on September 10, 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.*