# Dev Calculator vs 39Tools

The clearest difference is update cadence: Dev Calculator at every 11 days against 39Tools's every 9 months. 39Tools's advantage is iOS requirement (12.0 vs 14.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Dev Calculator ships an update every 11 days, 39Tools every 9 months. The most recent releases landed on September 1, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | Dev Calculator | 39Tools |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (4 ratings)](https://appshunter.io/ios/app/dev-calculator/id1557104193/reviews)** | — |
| Number of ratings | **4** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 11 days** | Every 9 months |
| Monetization | Free | — |
| Size | 0 MB | 112 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Scott Lassen](https://appshunter.io/developer/1773765380) | [策 王](https://appshunter.io/developer/1681706231) |

## What reviewers say

### Dev Calculator

[App page](https://appshunter.io/ios/app/dev-calculator/id1557104193)

A free, ad-free developer calculator focused on bitwise operations and base conversions. It supports unsigned integers up to 64 bits and includes features like shifting, rotating, and casting.

**Highlights:** Bitwise operations (AND, NOT, OR, XOR), Shifting and rotating, Casting support, 64-bit unsigned integer support, Base conversions, No ads

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

**In-app purchases:** none


### 39Tools

[App page](https://appshunter.io/ios/app/39tools/id6447797534)

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

**In-app purchases:** none


## Frequently asked questions

### Is Dev Calculator free?

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

### Is 39Tools free?

39Tools is free to download, with no in-app purchases.

### Do Dev Calculator or 39Tools have ads?

Neither Dev Calculator nor 39Tools shows ads.

### Which is updated more often, Dev Calculator or 39Tools?

Dev Calculator ships an update every 11 days, and 39Tools every 9 months. Most recently, Dev Calculator was updated on September 1, 2026 and 39Tools on September 10, 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.*