# 01Converter vs PHD Actuator Sizing

The clearest difference is rating: PHD Actuator Sizing at 5.0 against 01Converter's 4.5. PHD Actuator Sizing also leads on update cadence (every 3 weeks vs every 9 months). 01Converter's advantage is iOS requirement (8.1 vs 17.6). On price, ratings volume, ads and in-app purchases there is nothing between them.

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

PHD Actuator Sizing holds the better App Store score, 5.0 against 4.5. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

01Converter ships an update every 9 months, PHD Actuator Sizing every 3 weeks. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

## The numbers

| Metric | 01Converter | PHD Actuator Sizing |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.5 (2 ratings)](https://appshunter.io/ios/app/01converter/id334626954/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/phd-actuator-sizing/id6759474917/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 94.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 11 MB | 1 MB |
| Requires iOS | **8.1** | 17.6 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Francesco Burelli](https://appshunter.io/developer/334626957) | [Krishna Meruva](https://appshunter.io/developer/1864409993) |

## What reviewers say

### 01Converter

[App page](https://appshunter.io/ios/app/01converter/id334626954)

This app allows for easy conversion between binary, hexadecimal, octal, and decimal number systems. It also includes functions for bitwise operations like shifting and arithmetic operations such as adding or subtracting one. An optimized keyboard simplifies input for various number bases.

**Highlights:** Number system conversion (binary, hex, octal, decimal), Unicode conversion, Shift left function, Shift right function, Add 1 function, Subtract 1 function

**Features:** macOS Compatibility

**In-app purchases:** none


### PHD Actuator Sizing

[App page](https://appshunter.io/ios/app/phd-actuator-sizing/id6759474917)

This engineering tool helps automation professionals quickly size servo motors for industrial applications. It allows users to input motion profiles and automatically calculates torque and inertia for accurate motor selection. Generate detailed reports and verify performance against motor specifications.

**Highlights:** Select from full actuator lineup, Input motion profiles, Automatic RMS torque calculations, Inertia ratio verification, Peak torque and speed checks, Exportable sizing reports

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is 01Converter free?

01Converter is free to download, with no in-app purchases.

### Is PHD Actuator Sizing free?

PHD Actuator Sizing is free to download, with no in-app purchases.

### Which has better reviews, 01Converter or PHD Actuator Sizing?

PHD Actuator Sizing is rated higher. 01Converter averages 4.5 out of 5 from 2 ratings, while PHD Actuator Sizing averages 5.0 from 2 ratings.

### Do 01Converter or PHD Actuator Sizing have ads?

Neither 01Converter nor PHD Actuator Sizing shows ads.

### Which is updated more often, 01Converter or PHD Actuator Sizing?

01Converter ships an update every 9 months, and PHD Actuator Sizing every 3 weeks. Most recently, 01Converter was updated on November 6, 2026 and PHD Actuator Sizing on October 31, 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.*