ChemiCalc vs Notysing
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ChemiCalc
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.
- Unit conversion for chemistry and physics
- Simultaneous value display
- Energy, wavelength, and frequency conversion
- Quantum mechanics formulas
- Fundamental constants included
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ChemiCalc is a powerful unit converter for chemistry and physics calculations. Students and teachers can enter and simultaneously view converted values for energy, wavelength and frequency. Formulas and fundamental constants relevant for quantum mechanics are included.
Notysing
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.
- Interactive singing lessons
- Digital song coach feedback
- Learn music notation
- Develop rhythm and intonation
- Progress tracking
- Music theory fundamentals
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Learn the basics of music in a fun and musical way by singing. You are guided by your digital song coach Noty, who gives you feedback on what you do on your level, from the very first steps and all the way through! TRY FOR FREE - UPGRADE FOR CHEAP The first lessons of Notysing are free, no account needed. To access all lessons, unlock the app for a small fee. Read more about the low pricing on notysing.com. INTERACTIVE LESSONS In Notysing you learn to sing from written music in interactive lessons, and along the way you will pick up knowledge in note names, scales, keys, rhythm, music theory and much more. As with language, you learn music best by imitating, testing and reflecting, by combining theory and practice. It might sound like magic, but with Notysing, anyone that can sing a note can learn to sing from music notation! “Suddenly sheet music transforms into music, and you can hear what’s written”. It is much like reading and writing, and by doing the exercises you develop your musicality – singing, rhythm and intonation. DEVELOPED BY EDUCATORS AND RESEARCHERS Notysing is developed by music teachers and researchers in an ongoing research project involving The Royal College of Music in Stockholm and Doremir Music Research. The project examines how Doremir’s groundbreaking technology of music interpretation can be used for learning musical literacy. The app has been tested in music education of junior high and high school, but can of course be used by anyone who can read, regardless of age or music knowledge. Music students, choir singers and band members who wants to improve their music learning can benefit from Notysing! PEDAGOGICAL MODEL The pedagogical model, created together with the Royal College of Music in Stockholm, starts with note names ("C D E"), and proceeds to use scale degree numbers ("1 2 3"). This was worked out to be the easiest way to understand scales without having to learn specific new vocabulary, and instead focus on the singing. The app then teaches key signatures and rhythm, enabling the user to sing real songs from notation! Upcoming lessons will move on to teach solfège ("Do Re Mi"), but with scale degree numbers being very intuitive, the app can already be used in parallel to solfège based learning. TOOLS FOR TEACHERS Notysing performs best as a complement to teacher-led music education. With Notysing, your students can meet the goals of the curriculum regarding music literacy, music notation and the understanding of how music can be represented and organized. Each student has their own development path so you can give relevant feedback and get a basis for grading. Music teachers, choir and band leaders can use Notysing with your students and track their progress through the Notysing Dashboard.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | ChemiCalc | Notysing |
|---|---|---|
| Price | $0.99 | Free — better |
| Rating | 5.0 (2 ratings) — better | 3.4 (10 ratings) |
| Positive reviews | 100.0% of reviews — better | 55.6% of reviews |
| Number of ratings | 2 | 10 — better |
| Update frequency | Every 38 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Free with in-app purchases — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 12.0 — better |
| Further details — not scored | ||
| Size | 4 MB | 95 MB |
| Age rating | 4+ | 4+ |
| Developer | Rhodium Inc. | DoReMIR Music Research AB |
Customer experience
ChemiCalc
Notysing
In-app purchases
ChemiCalc
No in-app purchases
Notysing
- Notysing Unlock All Courses$3.99









