# Unit Converter | Converter4U vs Lock Notes Pro

The clearest difference is price: Unit Converter | Converter4U at Free against Lock Notes Pro's $9.99. Unit Converter | Converter4U also leads on in-app purchases (none vs 1) and iOS requirement (9.0 vs 13.0). Lock Notes Pro's advantage is update cadence (every 2 weeks vs every 4 months) and review sentiment (82% vs 57%). On rating, ratings volume, ads and device support there is nothing between them.

Unit Converter | Converter4U is free to download; Lock Notes Pro costs $9.99 up front. Lock Notes Pro sells 1 in-app purchase, starting at $14.99 per year. Unit Converter | Converter4U asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.6 for Unit Converter | Converter4U against 4.6 for Lock Notes Pro. Both are backed by a comparable volume of ratings — 194 and 270 respectively. Written reviews are what separate them: 57% of Unit Converter | Converter4U's written reviews are positive against 82% of Lock Notes Pro's.

Unit Converter | Converter4U ships an update every 4 months, Lock Notes Pro every 2 weeks. Both last shipped on October 14, 2026.

## The numbers

| Metric | Unit Converter | Converter4U | Lock Notes Pro |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | [4.6 (194 ratings)](https://appshunter.io/ios/app/unit-converter-converter4u/id620969788/reviews) | [4.6 (270 ratings)](https://appshunter.io/ios/app/lock-notes-pro/id1052612947/reviews) |
| Number of ratings | 194 | **270** |
| Positive reviews | 57.1% of reviews | **82.3% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 weeks** |
| Monetization | **Free** | Paid |
| Size | 51 MB | 8 MB |
| Requires iOS | **9.0** | 13.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [VisTech.Projects LLC](https://appshunter.io/developer/620969851) | [JulyApps Ltd](https://appshunter.io/developer/427694580) |

## What reviewers say

### Unit Converter | Converter4U

[App page](https://appshunter.io/ios/app/unit-converter-converter4u/id620969788)

This app provides a powerful and intuitive way to convert between a wide range of units, including length, weight, temperature, and more. It offers simultaneous conversion of multiple units and customizable options for a personalized experience. Get instant, accurate results for all your conversion needs.

**Highlights:** Simultaneous multi-unit conversion, Customizable unit options, Copy converted values to clipboard, Supports numerous measurement categories, Intuitive and user-friendly interface

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

**In-app purchases:** none


### Lock Notes Pro

[App page](https://appshunter.io/ios/app/lock-notes-pro/id1052612947)

Securely store and protect your private notes with password or Touch ID access. This app allows you to keep sensitive information like passwords, secrets, and diaries safe from unauthorized viewing. It offers features like iCloud backup and syncing, image insertion, and printing.

**Highlights:** Password and Touch ID protection, iCloud backup and sync, Insert images and photos, Print notes, Sort and customize notes, Security question recovery

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Auto Backup | $14.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 🔒 Secure storage of notes
- 💡 Useful for organizing personal information
- 🚀 Efficient app performance
- 🔒 Password protection for notes

**What reviewers complain about**

- 🐛 Occasional crashes or bugs
- 🔒 Concerns about data loss or backup issues
- 🔒 Difficulty restoring notes from backup
- 💡 Lack of advanced features like checklists or reminders

**Reported bugs**

- Crashes after iOS updates
- Unable to edit or update notes without losing data
- Syncing issues between devices

**Requested features**

- Add checklist functionality
- Implement a recycle bin for deleted notes
- Improve syncing and backup options
- Add more customization options for font, layout, etc.


## Frequently asked questions

### Is Unit Converter | Converter4U free?

Unit Converter | Converter4U is free to download, with no in-app purchases.

### Is Lock Notes Pro free?

Lock Notes Pro costs $9.99, and also offers in-app purchases.

### Which has better reviews, Unit Converter | Converter4U or Lock Notes Pro?

Unit Converter | Converter4U and Lock Notes Pro are both rated 4.6 out of 5 on the App Store, from 194 and 270 ratings respectively.

### Do Unit Converter | Converter4U or Lock Notes Pro have ads?

Neither Unit Converter | Converter4U nor Lock Notes Pro shows ads.

### Which is updated more often, Unit Converter | Converter4U or Lock Notes Pro?

Unit Converter | Converter4U ships an update every 4 months, and Lock Notes Pro every 2 weeks. Most recently, Unit Converter | Converter4U was updated on October 14, 2026 and Lock Notes Pro 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.*