# techSampler vs Equation Encyclopedia

The clearest difference is ads: techSampler at none against Equation Encyclopedia's shown. techSampler also leads on iOS requirement (7.0 vs 15.0). Equation Encyclopedia's advantage is update cadence (every 4 days vs every 4 months). On price, in-app purchases and device support there is nothing between them.

Both are free to download. techSampler sells 1 one-off in-app purchase and Equation Encyclopedia sells 9 in-app purchases, starting at $6.99 per month. Whichever you choose, the download price is not the number that matters.

techSampler ships an update every 4 months, Equation Encyclopedia every 4 days. The most recent releases landed on September 4, 2026 and September 8, 2026 respectively.

## The numbers

| Metric | techSampler | Equation Encyclopedia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/techsampler/id626214040/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 38 MB | 451 MB |
| Requires iOS | **7.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Byte Works, Inc.](https://appshunter.io/developer/286319447) | [SAMUEL MOYOSORE O ADEYIGA](https://appshunter.io/developer/1874179107) |

## 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 |


### Equation Encyclopedia

[App page](https://appshunter.io/ios/app/equation-encyclopedia/id6758647681)

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

**In-app purchases (9)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Plus Monthly | $6.99 | per month |
| Pro Monthly | $10.99 | per month |
| Ultra Monthly | $17.99 | per month |
| Plus Yearly | $49.99 | per year |
| Pro Yearly | $99.99 | per year |
| Ultra Yearly | $149.99 | per year |
| 10 Energy | $0.99 | one-time |
| 30 Energy | $2.99 | one-time |
| 100 Energy | $8.99 | one-time |


## Frequently asked questions

### Is techSampler free?

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

### Is Equation Encyclopedia free?

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

### Do techSampler or Equation Encyclopedia have ads?

Equation Encyclopedia shows ads; techSampler does not.

### Which is updated more often, techSampler or Equation Encyclopedia?

techSampler ships an update every 4 months, and Equation Encyclopedia every 4 days. Most recently, techSampler was updated on September 4, 2026 and Equation Encyclopedia on September 8, 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.*