Dev Calculator vs 39Tools
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Dev Calculator
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.
- Bitwise operations (AND, NOT, OR, XOR)
- Shifting and rotating
- Casting support
- 64-bit unsigned integer support
- Base conversions
- No ads
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Full featured, completely free, developer calculator with no ads. Designed primarily for bit operations and quick conversion of bases. In-app purchases don't affect features and are only meant as a way to donate to the developer for his effort. Supports bitwise operations like AND, NOT, OR, XOR. Also supports shifting, rotating and casting. This calculator supports unsigned integers up to 64 bits.
39Tools
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39Tools is a application that integrates SSH,MYSQL,TCP,UDP,MQTT,BLE,Video and other debugging tools.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | Dev Calculator | 39Tools |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 4 — better | — |
| Update frequency | Every 11 days — better | Every 9 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 14.0 | 12.0 — better |
| Further details — not scored | ||
| Size | 0 MB | 112 MB |
| Age rating | 4+ | 4+ |
| Developer | Scott Lassen | 策 王 |
In-app purchases
Dev Calculator
No in-app purchases
39Tools
No in-app purchases
