# Camera Lucida vs KnowledgeGraph

The clearest difference is price: Camera Lucida at Free against KnowledgeGraph's $2.99. Camera Lucida also leads on update cadence (every 6 weeks vs every 5 months). KnowledgeGraph's advantage is in-app purchases (none vs 5) and device support (5 vs 3). On ads and iOS requirement there is nothing between them.

Camera Lucida is free to download; KnowledgeGraph costs $2.99 up front. Camera Lucida sells 5 in-app purchases, starting at $4.99 per month. KnowledgeGraph asks for nothing beyond the download.

Camera Lucida ships an update every 6 weeks, KnowledgeGraph every 5 months. The most recent releases landed on September 25, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Camera Lucida | KnowledgeGraph |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[1.0 (3 ratings)](https://appshunter.io/ios/app/camera-lucida-tracing-app/id1546453560/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 4.4% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 5 months |
| Monetization | Free with in-app purchases | — |
| Size | 207 MB | 5 MB |
| Requires iOS | 14.4 | **14.0** |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac, Vision Pro** |
| Age rating | 4+ | 4+ |
| Developer | [Ilya Koryakin](https://appshunter.io/developer/1341649240) | [辉章 何](https://appshunter.io/developer/1687027088) |

## What reviewers say

### Camera Lucida

[App page](https://appshunter.io/ios/app/camera-lucida-tracing-app/id1546453560)

Transform your phone into a tracing projector using augmented reality. Overlay any image onto a surface and draw it with ease. Perfect for artists and hobbyists looking to enhance their drawing skills.

**Highlights:** Augmented reality drawing, Trace images onto paper, Intuitive user interface, AR tracing templates, Accurate perspective rendering

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lucida Premium | $4.99 | per month |
| Yearly subscription | $6.99 | per year |
| Lucida Premium | $9.99 | per year |
| Lucida Premium | $29.99 | per year |
| Lucida Premium | $19.99 | one-time |


### KnowledgeGraph

[App page](https://appshunter.io/ios/app/knowledgegraph/id6503631594)

**In-app purchases:** none


## Frequently asked questions

### Is Camera Lucida free?

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

### Is KnowledgeGraph free?

KnowledgeGraph costs $2.99, with no in-app purchases.

### Do Camera Lucida or KnowledgeGraph have ads?

Neither Camera Lucida nor KnowledgeGraph shows ads.

### Which is updated more often, Camera Lucida or KnowledgeGraph?

Camera Lucida ships an update every 6 weeks, and KnowledgeGraph every 5 months. Most recently, Camera Lucida was updated on September 25, 2026 and KnowledgeGraph on September 27, 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.*