# 2s Complement Calculator vs Smart Convert

The clearest difference is in-app purchases: 2s Complement Calculator at none against Smart Convert's 1. 2s Complement Calculator also leads on ads (none vs shown) and iOS requirement (13.0 vs 16.2). Smart Convert's advantage is update cadence (every 3 weeks vs every 15 months). On price and device support there is nothing between them.

Both are free to download. Smart Convert sells 1 one-off in-app purchase. 2s Complement Calculator asks for nothing beyond the download.

2s Complement Calculator ships an update every 15 months, Smart Convert every 3 weeks. The most recent releases landed on September 13, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | 2s Complement Calculator | Smart Convert |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.0 (2 ratings)](https://appshunter.io/ios/app/smart-convert-base-converter/id6450381653/reviews)** |
| Number of ratings | — | **2** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 15 months | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Size | 17 MB | 4 MB |
| Requires iOS | **13.0** | 16.2 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Ahmad Sattar](https://appshunter.io/developer/1458483953) | [Koya Nambo](https://appshunter.io/developer/1633778504) |

## What reviewers say

### 2s Complement Calculator

[App page](https://appshunter.io/ios/app/2s-complement-calculator/id1607991482)

**Features:** macOS Compatibility

**In-app purchases:** none


### Smart Convert

[App page](https://appshunter.io/ios/app/smart-convert-base-converter/id6450381653)

Easily switch numbers between various bases, from binary to base 62. Ideal for developers, students, and math enthusiasts needing quick and reliable conversions with fractional parts. Features include instant common base conversions, custom base support, and conversion history.

**Highlights:** Convert between bases 2 to 62, Quick mode for common bases, Custom mode for any base pair, Save and recall conversion history, Support for fractional numbers, Light and dark themes, Localized in 9 languages

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| No Ads | $2.99 | one-time |


## Frequently asked questions

### Is 2s Complement Calculator free?

2s Complement Calculator is free to download, with no in-app purchases.

### Is Smart Convert free?

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

### Do 2s Complement Calculator or Smart Convert have ads?

Smart Convert shows ads; 2s Complement Calculator does not.

### Which is updated more often, 2s Complement Calculator or Smart Convert?

2s Complement Calculator ships an update every 15 months, and Smart Convert every 3 weeks. Most recently, 2s Complement Calculator was updated on September 13, 2026 and Smart Convert on September 22, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*