# Programmer Calculator Lite vs Design Patterns for Devs

The clearest difference is in-app purchases: Programmer Calculator Lite at none against Design Patterns for Devs's 1. Programmer Calculator Lite also leads on iOS requirement (16 vs 26.0). Design Patterns for Devs's advantage is ads (none vs shown) and update cadence (every 2 months vs every 22 months). On price and device support there is nothing between them.

Both are free to download. Design Patterns for Devs sells 1 one-off in-app purchase. Programmer Calculator Lite asks for nothing beyond the download.

Programmer Calculator Lite ships an update every 22 months, Design Patterns for Devs every 2 months. The most recent releases landed on October 30, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | Programmer Calculator Lite | Design Patterns for Devs |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/design-patterns-for-devs/id6754806188/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 22 months | **Every 2 months** |
| Monetization | — | Free with in-app purchases |
| Size | 10 MB | 24 MB |
| Requires iOS | **16** | 26.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Juan Bustos](https://appshunter.io/developer/1628019559) | [Daniel Gogozan](https://appshunter.io/developer/1664769372) |

## What reviewers say

### Programmer Calculator Lite

[App page](https://appshunter.io/ios/app/programmer-calculator-lite/id1628356417)

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

**In-app purchases:** none


### Design Patterns for Devs

[App page](https://appshunter.io/ios/app/design-patterns-for-devs/id6754806188)

Master software design patterns with interactive flashcards. This app provides comprehensive lessons, code examples, and quizzes to help developers understand and apply architectural concepts for better coding and clearer architecture.

**Highlights:** Interactive flashcards, Gang of Four pattern coverage, Real-world analogies, UML diagrams and code examples, Usage, Pros & Cons, Quizzes for retention

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


## Frequently asked questions

### Is Programmer Calculator Lite free?

Programmer Calculator Lite is free to download, with no in-app purchases.

### Is Design Patterns for Devs free?

Design Patterns for Devs is free to download, with in-app purchases available.

### Do Programmer Calculator Lite or Design Patterns for Devs have ads?

Programmer Calculator Lite shows ads; Design Patterns for Devs does not.

### Which is updated more often, Programmer Calculator Lite or Design Patterns for Devs?

Programmer Calculator Lite ships an update every 22 months, and Design Patterns for Devs every 2 months. Most recently, Programmer Calculator Lite was updated on October 30, 2026 and Design Patterns for Devs on October 14, 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.*