# 3Satz! Rechner vs PrimeNote

The clearest difference is in-app purchases: 3Satz! Rechner at none against PrimeNote's 8. PrimeNote's advantage is update cadence (every 2 months vs every 25 months) and iOS requirement (15.6 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. PrimeNote sells 8 in-app purchases, starting at $6.99 per 7 days. 3Satz! Rechner asks for nothing beyond the download.

3Satz! Rechner ships an update every 25 months, PrimeNote every 2 months. The most recent releases landed on October 8, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | 3Satz! Rechner | PrimeNote |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[1.0 (2 ratings)](https://appshunter.io/ios/app/primenote-ai-study-note-taker/id6757773153/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 25 months | **Every 2 months** |
| Monetization | Paid | **Freemium** |
| Size | 3 MB | 97 MB |
| Requires iOS | 17.0 | **15.6** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sebastian Ueberwolf](https://appshunter.io/developer/1313264509) | [Future AI](https://appshunter.io/developer/1861456409) |

## What reviewers say

### 3Satz! Rechner

[App page](https://appshunter.io/ios/app/3satz-rechner/id1313264510)

This app simplifies complex calculations using the rule of three. It's designed for quick and accurate problem-solving in various contexts.

**Highlights:** Rule of three calculations, Accurate problem-solving, Simple interface, Supports iOS devices

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

**In-app purchases:** none


### PrimeNote

[App page](https://appshunter.io/ios/app/primenote-ai-study-note-taker/id6757773153)

Transform lectures, PDFs, and screenshots into AI-powered study notes. Generate summaries, flashcards, quizzes, and even a listenable podcast to enhance learning and retention. Study smarter, remember more with tools designed for active recall and spaced repetition.

**Highlights:** AI-generated summaries, Auto-generated flashcards, Comprehension quizzes, Listenable AI study podcast, Spaced repetition review, Progress tracking, OCR for image notes

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

**In-app purchases (8)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PrimeNote Pro: Unlimited AI Notes | $6.99 | per 7 days |
| PrimeNote Pro: Unlimited AI Notes | $12.99 | per month |
| PrimeNote Pro: Unlimited AI Notes | $79.99 | per year |
| PrimeNote Pro Yearly | $79.99 | per year |
| 200 AI Credits | $4.99 | one-time |
| 900 AI Credits | $17.99 | one-time |
| 2,700 AI Credits | $44.99 | one-time |
| 6,300 AI Credits | $89.99 | one-time |


## Frequently asked questions

### Is 3Satz! Rechner free?

3Satz! Rechner is free to download, with no in-app purchases.

### Is PrimeNote free?

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

### Do 3Satz! Rechner or PrimeNote have ads?

Neither 3Satz! Rechner nor PrimeNote shows ads.

### Which is updated more often, 3Satz! Rechner or PrimeNote?

3Satz! Rechner ships an update every 25 months, and PrimeNote every 2 months. Most recently, 3Satz! Rechner was updated on October 8, 2026 and PrimeNote 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.*