# ChemiCalc vs Notysing

The clearest difference is price: Notysing at Free against ChemiCalc's $0.99. Notysing also leads on update cadence (every 3 weeks vs every 38 months) and ratings volume (10 vs 2). ChemiCalc's advantage is review sentiment (100% vs 56%) and rating (5.0 vs 3.4). On ads and device support there is nothing between them.

Notysing is free to download; ChemiCalc costs $0.99 up front. Notysing sells 1 one-off in-app purchase. ChemiCalc asks for nothing beyond the download.

ChemiCalc holds the better App Store score, 5.0 against 3.4. That said, the two scores are not equally well evidenced: Notysing has 10 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 100% of ChemiCalc's written reviews are positive against 56% of Notysing's.

ChemiCalc ships an update every 38 months, Notysing every 3 weeks. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | ChemiCalc | Notysing |
| --- | --- | --- |
| Price | $0.99 | **Free** |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/chemicalc/id819641904/reviews)** | [3.4 (10 ratings)](https://appshunter.io/ios/app/notysing/id1439785365/reviews) |
| Number of ratings | 2 | **10** |
| Positive reviews | **100.0% of reviews** | 55.6% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 38 months | **Every 3 weeks** |
| Monetization | Paid | **Free with in-app purchases** |
| Size | 4 MB | 95 MB |
| Requires iOS | 15.6 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Rhodium Inc.](https://appshunter.io/developer/819641907) | [DoReMIR Music Research AB](https://appshunter.io/developer/566535241) |

## What reviewers say

### ChemiCalc

[App page](https://appshunter.io/ios/app/chemicalc/id819641904)

This app simplifies unit conversions for chemistry and physics, offering simultaneous views of converted values for energy, wavelength, and frequency. It includes essential formulas and fundamental constants for quantum mechanics, making it a valuable tool for students and educators.

**Highlights:** Unit conversion for chemistry and physics, Simultaneous value display, Energy, wavelength, and frequency conversion, Quantum mechanics formulas, Fundamental constants included

**Features:** macOS Compatibility

**In-app purchases:** none


### Notysing

[App page](https://appshunter.io/ios/app/notysing/id1439785365)

Learn music fundamentals through interactive singing lessons guided by a digital coach. Develop skills in reading sheet music, understanding rhythm, and improving intonation. Suitable for all ages and levels of music knowledge.

**Highlights:** Interactive singing lessons, Digital song coach feedback, Learn music notation, Develop rhythm and intonation, Progress tracking, Music theory fundamentals

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Notysing Unlock All Courses | $3.99 | one-time |


## Frequently asked questions

### Is ChemiCalc free?

ChemiCalc costs $0.99, with no in-app purchases.

### Is Notysing free?

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

### Which has better reviews, ChemiCalc or Notysing?

ChemiCalc is rated higher. ChemiCalc averages 5.0 out of 5 from 2 ratings, while Notysing averages 3.4 from 10 ratings.

### Do ChemiCalc or Notysing have ads?

Neither ChemiCalc nor Notysing shows ads.

### Which is updated more often, ChemiCalc or Notysing?

ChemiCalc ships an update every 38 months, and Notysing every 3 weeks. Most recently, ChemiCalc was updated on November 1, 2026 and Notysing on November 2, 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.*