# CSiUnits vs PIX4Dcatch

The clearest difference is in-app purchases: CSiUnits at none against PIX4Dcatch's 1. CSiUnits also leads on review sentiment (50% vs 33%) and iOS requirement (9.0 vs 18.0). PIX4Dcatch's advantage is ratings volume (264 vs 4) and update cadence (every 2 weeks vs monthly). On price, rating, ads and device support there is nothing between them.

Both are free to download. PIX4Dcatch sells 1 in-app purchase, starting at $159.00 per month. CSiUnits asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.8 for CSiUnits against 4.7 for PIX4Dcatch. That said, the two scores are not equally well evidenced: PIX4Dcatch has 264 ratings behind it against 4, so its average is the more settled of the two. Written reviews are what separate them: 50% of CSiUnits's written reviews are positive against 33% of PIX4Dcatch's.

CSiUnits ships an update monthly, PIX4Dcatch every 2 weeks. The most recent releases landed on September 17, 2026 and October 15, 2026 respectively.

## The numbers

| Metric | CSiUnits | PIX4Dcatch |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (4 ratings)](https://appshunter.io/ios/app/csiunits/id1344138128/reviews)** | [4.7 (264 ratings)](https://appshunter.io/ios/app/pix4dcatch-3d-scanner/id1511483044/reviews) |
| Number of ratings | 4 | **264** |
| Positive reviews | **50.0% of reviews** | 32.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Every 2 weeks** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 13 MB | 239 MB |
| Requires iOS | **9.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Computers and Structures, Inc.](https://appshunter.io/developer/1119970032) | [Pix4D](https://appshunter.io/developer/952725638) |

## What reviewers say

### CSiUnits

[App page](https://appshunter.io/ios/app/csiunits/id1344138128)

This application provides a comprehensive tool for converting units across various scientific disciplines and everyday needs. It offers over 70 conversion options, catering to professionals, students, and anyone requiring precise unit transformations.

**Highlights:** Multiple one-time conversion lists, Conversions for lifestyle and science, Over 70 conversion options, Numeric value input, Converted values to all possible units

**In-app purchases:** none


### PIX4Dcatch

[App page](https://appshunter.io/ios/app/pix4dcatch-3d-scanner/id1511483044)

Transform your mobile device into a powerful 3D scanner. Capture images and LiDAR data to create accurate 3D models for professional use. Visualize, measure, and share your creations in AR.

**Highlights:** 3D model creation from images and LiDAR, RTK device compatibility for centimeter accuracy, Live feedback during capture, Augmented reality (AR) model visualization, Cloud processing and desktop export options, Measurement and geolocation capabilities

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PIX4Dcatch Professional | $159.00 | per month |

**What reviewers like**

- 👍 Great idea for photogrammetry
- 🚀 Works well for professional use
- 👍 Consistently gets survey grade results
- 👍 Useful as an additional survey tool
- 👍 Amazing, game changer

**What reviewers complain about**

- 💰 Very expensive subscription
- 💰 High monthly subscription cost
- 💰 Way too expensive for small objects
- 💰 Unclear cost structure
- 💰 Credits add up unexpectedly

**Reported bugs**

- App crashes or shows SDK error with Emlid RX
- Upload doesn't work for Dropbox or OneDrive
- Mesh doesn't display like past versions
- Cannot build an accurate model
- App locks out

**Requested features**

- Make it possible to work with any GNSS through NMEA Protocol
- Export GCP's in GPS coordinates as well
- Add instructions or tips
- Allow export to local device instead of cloud
- Allow export of images to PC for free


## Frequently asked questions

### Is CSiUnits free?

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

### Is PIX4Dcatch free?

PIX4Dcatch is free to download, with in-app purchases available.

### Which has better reviews, CSiUnits or PIX4Dcatch?

CSiUnits is rated higher. CSiUnits averages 4.8 out of 5 from 4 ratings, while PIX4Dcatch averages 4.7 from 264 ratings.

### Do CSiUnits or PIX4Dcatch have ads?

Neither CSiUnits nor PIX4Dcatch shows ads.

### Which is updated more often, CSiUnits or PIX4Dcatch?

CSiUnits ships an update monthly, and PIX4Dcatch every 2 weeks. Most recently, CSiUnits was updated on September 17, 2026 and PIX4Dcatch on October 15, 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.*