# Principia vs Stream Frame

The clearest difference is price: Principia at Free against Stream Frame's $2.99. Stream Frame's advantage is in-app purchases (none vs 3) and ads (none vs shown). On device support and iOS requirement there is nothing between them.

Principia is free to download; Stream Frame costs $2.99 up front. Principia sells 3 one-off in-app purchases. Stream Frame asks for nothing beyond the download.

Principia ships an update every 2 months, Stream Frame daily. The most recent releases landed on October 24, 2026 and October 27, 2026 respectively.

## The numbers

| Metric | Principia | Stream Frame |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[2.0 (2 ratings)](https://appshunter.io/ios/app/principia-smart-ai-studio/id6740216432/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Every 2 months | **Daily** |
| Monetization | Ad-supported | — |
| Size | 26 MB | 19 MB |
| Requires iOS | 17.6 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 12+ | 4+ |
| Developer | [Edgar Zuniga](https://appshunter.io/developer/1647129574) | [Boxtree, Inc.](https://appshunter.io/developer/412561484) |

## What reviewers say

### Principia

[App page](https://appshunter.io/ios/app/principia-smart-ai-studio/id6740216432)

A private, customizable AI assistant for chat, writing, coding, and image analysis. It adapts to your needs, allowing you to choose AI models, set personalities, and keep your data local and private. Create content, code, and learn faster with this flexible AI tool.

**Highlights:** Customizable AI models, Personalized AI behavior, Context-aware chat, Image analysis and insights, Content creation, Code generation and debugging, Learning and research tools, Privacy-first, local storage

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 50 Credits | $0.99 | one-time |
| 150 Credits | $1.99 | one-time |
| 600 Credits | $6.99 | one-time |


### Stream Frame

[App page](https://appshunter.io/ios/app/stream-frame/id6811236182)

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

**In-app purchases:** none


## Frequently asked questions

### Is Principia free?

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

### Is Stream Frame free?

Stream Frame costs $2.99, with no in-app purchases.

### Do Principia or Stream Frame have ads?

Principia shows ads; Stream Frame does not.

### Which is updated more often, Principia or Stream Frame?

Principia ships an update every 2 months, and Stream Frame daily. Most recently, Principia was updated on October 24, 2026 and Stream Frame on October 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.*