# The 4th Dimension vs Nject

The clearest difference is price: The 4th Dimension at Free against Nject's $4.99. Nject's advantage is update cadence (every 6 weeks vs every 10 months) and chart position (#10 vs unranked). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

The 4th Dimension is free to download; Nject costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

The 4th Dimension ships an update every 10 months, Nject every 6 weeks. The most recent releases landed on September 20, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | The 4th Dimension | Nject |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | — | **[4.0 (126 ratings)](https://appshunter.io/ios/app/nject/id1620565745/reviews)** |
| Number of ratings | — | **126** |
| Positive reviews | — | 57.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 10 months | **Every 6 weeks** |
| Monetization | — | Free |
| Best chart rank | — | **#10** |
| Size | 1.6 GB | 68 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [NextMotion](https://appshunter.io/developer/1092580104) | [Keaton Benning, LLC](https://appshunter.io/developer/1692217678) |

## What reviewers say

### The 4th Dimension

[App page](https://appshunter.io/ios/app/the-4th-dimension/id1504436726)

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

**In-app purchases:** none


### Nject

[App page](https://appshunter.io/ios/app/nject/id1620565745)

**Currently charting:** #10 Top Paid · Medical (US App Store)

This app serves as a comprehensive resource for aesthetic professionals. It offers tools for dilution calculations, facilitates partnerships, and provides a live forum with experts. Users can also find assistance with vascular occlusion and access other valuable information.

**Highlights:** Dilution Calculators, Partnership Facilitation, Live Expert Forum, Vascular Occlusion Help

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

**In-app purchases:** none

**What reviewers like**

- 👍 User-friendly and simple interface
- 🎯 Accurate dosing calculations for toxin injections
- 📱 Visual syringe markings aid learning
- 🚀 Quick and efficient dosage conversions
- 💬 Responsive developer addressing user feedback

**What reviewers complain about**

- 🐛 App crashes when selecting syringes
- 🐛 Syringe dropdown menu shows 'no data' or won't populate
- 🐛 Screen doesn't scroll to access calculate button
- 🐛 Force closing on multiple devices
- ❌ Limited syringe options available

**Reported bugs**

- App crashes when selecting syringe option
- Syringe dropdown menu fails to load options
- Screen doesn't scroll to reveal calculate button after data entry
- Force closing on both iOS and Android devices
- Stuck on single medication screen (Semaglutide) with no navigation

**Requested features**

- Add Comfortox 0.5mL syringe option
- Add TB (tuberculin) syringe options
- Add allergen/product selection dropdown (Botox, Dysport, Azzalure, etc.)
- Visual indicator showing exact pull location on syringe for specific units
- Support for mg/mL dosing (for Semaglutide, tirzepatide, compounded medications)


## Frequently asked questions

### Is The 4th Dimension free?

The 4th Dimension is free to download, with no in-app purchases.

### Is Nject free?

Nject costs $4.99, with no in-app purchases.

### Do The 4th Dimension or Nject have ads?

Neither The 4th Dimension nor Nject shows ads.

### Which is updated more often, The 4th Dimension or Nject?

The 4th Dimension ships an update every 10 months, and Nject every 6 weeks. Most recently, The 4th Dimension was updated on September 20, 2026 and Nject on September 29, 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.*