# NMR Calculator 2

> NMR Calculator 2 (iPhone/iPad app by Jae-Seung Lee.)

- Source: https://appshunter.io/ios/app/nmr-calculator-2/id6466729022 (this page in markdown: same URL + `.md`)
- Developer: [Jae-Seung Lee](https://appshunter.io/developer/1146296876)
- Category: Education, Reference
- Price: Free
- Age rating: 4+
- Requires: iOS 26.0 · 2 MB
- Languages: English
- Released: 2023-09-22
- Data updated: 2026-07-08
- User reviews in markdown: https://appshunter.io/ios/app/nmr-calculator-2/id6466729022/reviews.md

## What is NMR Calculator 2?

The app shows a list of isotopes with non-zero nuclear spin angular momentum. Select an isotope to view its NMR properties and calculate fundamental NMR parameters.

Information section
For a chosen isotope, this section displays the atomic symbol with mass number, nuclear spin angular momentum, gyromagnetic ratio, and natural abundance.

Calculator section
Update any one parameter in a subsection to recalculate the others.
- Larmor frequencies: External magnetic field and the corresponding Larmor frequencies for the chosen isotope, the proton, and the free electron.
- Time domain: Number of data points, acquisition duration, and dwell time.
- Frequency domain: Number of data points, spectral width, and frequency resolution.
- Pulse 1: Pulse duration, flip angle, and RF amplitude in Hz and μT.
- Pulse 2: Pulse duration, flip angle, RF amplitude in Hz, and RF power relative to Pulse 1.
- Ernst angle: Ernst angle and repetition time for a given T₁ relaxation time.

NMR Assistant
An on-device AI assistant scoped to NMR topics, available where Apple Intelligence is supported. Ask questions in plain language — the assistant answers using the same calculation engine that powers the calculator, so results are always physically consistent.


## Version history (last 2 releases)

### 2.0 — 2026-06-24

Introducing NMR Assistant — ask questions about NMR parameters in plain language and get calculated answers instantly.
- The assistant is powered by on-device AI (available where Apple Intelligence is supported) and uses the same calculation engine as the built-in calculator, so all numerical results are physically consistent.
- You can ask things like "What is the Larmor frequency of ¹³C at 9.4 T?" or "What Ernst angle should I use with a T₁ of 2 seconds and a repetition time of 500 ms?" — and the assistant will compute the answer directly, not just describe how to do it.
- The assistant is scoped strictly to NMR topics, so it stays focused and on point.

### 1.0 — 2023-09-23

No release notes.

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All apps by Jae-Seung Lee: https://appshunter.io/developer/1146296876

## Related topics

[nmr calculator 2](https://appshunter.io/ios/topics/nmr-calculator-2)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-08.*