# Principles App vs 3D Snap

The clearest difference is ads: Principles App at none against 3D Snap's shown. 3D Snap's advantage is chart position (#160 vs unranked) and iOS requirement (18.0 vs 26.2). On price, update cadence, in-app purchases and device support there is nothing between them.

Both are free to download. Principles App sells 1 in-app purchase, starting at $1.99 per month and 3D Snap sells 15 in-app purchases, starting at $4.99 per 7 days. Whichever you choose, the download price is not the number that matters.

Principles App ships an update every 5 weeks, 3D Snap every 3 weeks. The most recent releases landed on October 11, 2026 and October 26, 2026 respectively.

## The numbers

| Metric | Principles App | 3D Snap |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.9 (538 ratings)](https://appshunter.io/ios/app/3d-snap-lidar-room-scanner/id6477467417/reviews)** |
| Number of ratings | — | **538** |
| Positive reviews | — | 30.9% of reviews |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 5 weeks | **Every 3 weeks** |
| Monetization | — | Free with in-app purchases |
| Best chart rank | — | **#160** |
| Size | 16 MB | 170 MB |
| Requires iOS | 26.2 | **18.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [RS9 Systems Pty Ltd](https://appshunter.io/developer/1708861804) | [BPMobile](https://appshunter.io/developer/1085442365) |

## What reviewers say

### Principles App

[App page](https://appshunter.io/ios/app/principles-app/id6467618900)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Principles Unlimited Monthly | $1.99 | per month |


### 3D Snap

[App page](https://appshunter.io/ios/app/3d-snap-lidar-room-scanner/id6477467417)

**Currently charting:** #160 Top Grossing · Productivity (US App Store)

Transform your iPhone into a powerful floor plan creator and 3D scanner using LiDAR technology. Quickly capture room layouts, measure spaces, and visualize objects in 3D for renovation, interior design, or moving.

**Highlights:** LiDAR-powered room scanning, Instant floor plan generation, 3D object scanning from photos, Accurate AR measurements, Export floor plans and 3D models, Measure walls, areas, and furniture

**Features:** Vision Pro support

**In-app purchases (15)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium | $4.99 | per 7 days |
| Premium | $5.99 | per 7 days |
| Premium | $5.99 | per 7 days |
| Premium | $6.99 | per 7 days |
| Premium | $6.99 | per 7 days |
| Premium | $7.99 | per 7 days |
| Premium | $8.99 | per 7 days |
| Premium | $8.99 | per 7 days |
| Premium | $9.99 | per 7 days |
| Premium | $9.99 | per 7 days |
| Premium | $19.99 | per year |
| Premium | $29.99 | per year |
| Premium | $39.99 | per year |
| Premium | $149.99 | per year |
| Premium | $149.99 | per year |

**What reviewers like**

- 🚀 Accurate measurements
- 👍 Easy to use
- 🤩 Helpful for home improvement projects
- 💯 Stunningly realistic 3D models

**What reviewers complain about**

- 🐛 Crashes frequently
- 🤯 Confusing navigation and UI
- 💰 Expensive subscription model
- 🚫 Incompatible with older devices
- 🤔 Inaccurate room scans and measurements

**Reported bugs**

- Walls appear crooked in 3D models
- Furniture obstructs accurate scanning
- Difficulty cancelling subscription

**Requested features**

- Ability to edit scanned rooms
- Option to manually input measurements
- Export functionality for floor plans
- Multi-room support


## Frequently asked questions

### Is Principles App free?

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

### Is 3D Snap free?

3D Snap is free to download, with in-app purchases available.

### Do Principles App or 3D Snap have ads?

3D Snap shows ads; Principles App does not.

### Which is updated more often, Principles App or 3D Snap?

Principles App ships an update every 5 weeks, and 3D Snap every 3 weeks. Most recently, Principles App was updated on October 11, 2026 and 3D Snap on October 26, 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.*