# techSampler vs Kepler's Laws

The clearest difference is rating: techSampler at 3.0 against Kepler's Laws's 1.0. techSampler also leads on device support (3 vs 1) and iOS requirement (7.0 vs 12.0). Kepler's Laws's advantage is in-app purchases (none vs 1). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. techSampler sells 1 one-off in-app purchase. Kepler's Laws asks for nothing beyond the download.

techSampler holds the better App Store score, 3.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 1 respectively.

techSampler ships an update every 4 months, Kepler's Laws every 7 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | techSampler | Kepler's Laws |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/techsampler/id626214040/reviews)** | [1.0 (1 ratings)](https://appshunter.io/ios/app/keplers-laws/id885067661/reviews) |
| Number of ratings | **2** | 1 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 7 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 38 MB | 16 MB |
| Requires iOS | **7.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPad |
| Age rating | 4+ | 4+ |
| Developer | [Byte Works, Inc.](https://appshunter.io/developer/286319447) | [Vladimir Vascak](https://appshunter.io/developer/868771511) |

## What reviewers say

### techSampler

[App page](https://appshunter.io/ios/app/techsampler/id626214040)

Explore dozens of free, standalone apps with complete source code for electronics, science, math, and graphics. This companion app to a popular book provides executable projects and programming tools for iPhone and iPad.

**Highlights:** Free standalone apps with source code, Electronics and sensor projects, Data collection and analysis, Interactive graphics and programming, Companion to O'Reilly book, Built-in help and debugger, STEM education tools

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Add Editing | $14.99 | one-time |


### Kepler's Laws

[App page](https://appshunter.io/ios/app/keplers-laws/id885067661)

Explore animated visualizations and interactive tasks designed to help you grasp Kepler's laws of planetary motion. This educational tool offers a clear way to understand complex astronomical concepts through visual aids and practical exercises.

**Highlights:** Animated visualizations, Interactive tasks, Understanding planetary motion, Educational tool, Astronomy concepts

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is techSampler free?

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

### Is Kepler's Laws free?

Kepler's Laws is free to download, with no in-app purchases.

### Which has better reviews, techSampler or Kepler's Laws?

techSampler is rated higher. techSampler averages 3.0 out of 5 from 2 ratings, while Kepler's Laws averages 1.0 from 1 ratings.

### Do techSampler or Kepler's Laws have ads?

Neither techSampler nor Kepler's Laws shows ads.

### Which is updated more often, techSampler or Kepler's Laws?

techSampler ships an update every 4 months, and Kepler's Laws every 7 months. Most recently, techSampler was updated on November 1, 2026 and Kepler's Laws on November 1, 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.*