# QuantumNote vs SustainsysAI

The clearest difference is update cadence: SustainsysAI at every 8 days against QuantumNote's every 2 months. On price, ads, 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.

QuantumNote ships an update every 2 months, SustainsysAI every 8 days. The most recent releases landed on October 24, 2026 and October 12, 2026 respectively.

## The numbers

| Metric | QuantumNote | SustainsysAI |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/quantumnote-quantum-computing/id6755923805/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 8 days** |
| Monetization | Free | — |
| Size | 5 MB | 31 MB |
| Requires iOS | 16.0 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Dinesh Malla](https://appshunter.io/developer/1838122307) | [Satyawan Singh](https://appshunter.io/developer/1882830658) |

## What reviewers say

### QuantumNote

[App page](https://appshunter.io/ios/app/quantumnote-quantum-computing/id6755923805)

Master quantum computing with a comprehensive learning companion covering fundamentals to advanced algorithms. Explore topics with clear explanations, code examples, and progress tracking. Designed for students, developers, and enthusiasts.

**Highlights:** Comprehensive curriculum with 66 topics, Beginner to advanced content, Code examples with Python/Qiskit, Formula reference with LaTeX, Progress tracking and practice mode, Offline access, Dark mode

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

**In-app purchases:** none


### SustainsysAI

[App page](https://appshunter.io/ios/app/sustainsysai/id6760136910)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is QuantumNote free?

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

### Is SustainsysAI free?

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

### Do QuantumNote or SustainsysAI have ads?

Neither QuantumNote nor SustainsysAI shows ads.

### Which is updated more often, QuantumNote or SustainsysAI?

QuantumNote ships an update every 2 months, and SustainsysAI every 8 days. Most recently, QuantumNote was updated on October 24, 2026 and SustainsysAI on October 12, 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.*