# NMR Tutor vs Rondo

The clearest difference is in-app purchases: NMR Tutor at none against Rondo's 5. NMR Tutor also leads on iOS requirement (17.6 vs 26.0). Rondo's advantage is update cadence (every 3 days vs fortnightly). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Rondo sells 5 one-off in-app purchases. NMR Tutor asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for NMR Tutor against 5.0 for Rondo. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

NMR Tutor ships an update fortnightly, Rondo every 3 days. The most recent releases landed on October 10, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | NMR Tutor | Rondo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/nmr-tutor/id785450176/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/rondo-prime-factorization/id6784029039/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Fortnightly | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 7 MB | 11 MB |
| Requires iOS | **17.6** | 26.0 |
| Devices | iPhone, iPad, Mac | iPhone, iPad, Apple Watch |
| Age rating | 4+ | 4+ |
| Developer | [Tim E. Burrow](https://appshunter.io/developer/367216557) | [KEN TOMINAGA](https://appshunter.io/developer/975026926) |

## What reviewers say

### NMR Tutor

[App page](https://appshunter.io/ios/app/nmr-tutor/id785450176)

Explore NMR data acquisition and signal processing with interactive simulations. Adjust parameters like noise, apodization, and phase to observe immediate effects on FID and spectra. Learn about common artifacts and advanced concepts like spin-spin coupling.

**Highlights:** Interactive FID and spectra simulations, Adjustable peak positions and decay, Noise and apodization control, Zero filling and phase correction, Simulate acquisition artifacts, Explore spin-spin coupling

**Features:** Vision Pro support

**In-app purchases:** none


### Rondo

[App page](https://appshunter.io/ios/app/rondo-prime-factorization/id6784029039)

Explore the mathematical beauty of numbers through interactive, animated factorization diagrams. Watch numbers dance, hear their unique songs, and even visualize them in augmented reality. Discover the stories behind special numbers and personalize your experience with customizable palettes and sounds.

**Highlights:** Animated factorization diagrams, Augmented reality number visualization, Auditory representation of factors, Interactive number exploration, Field Guide for special numbers, Home screen and Apple Watch widgets, Customizable color palettes and sounds

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip a prime · 199 | $1.99 | one-time |
| Tip a prime · 499 | $4.99 | one-time |
| Rondo Pro | $4.99 | one-time |
| Tip a prime · 599 | $5.99 | one-time |
| Tip a prime · 1999 | $19.99 | one-time |


## Frequently asked questions

### Is NMR Tutor free?

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

### Is Rondo free?

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

### Which has better reviews, NMR Tutor or Rondo?

NMR Tutor and Rondo are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do NMR Tutor or Rondo have ads?

Neither NMR Tutor nor Rondo shows ads.

### Which is updated more often, NMR Tutor or Rondo?

NMR Tutor ships an update fortnightly, and Rondo every 3 days. Most recently, NMR Tutor was updated on October 10, 2026 and Rondo on October 28, 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.*