# Spike AI vs Stable Diffusion

The clearest difference is rating: Stable Diffusion at 4.2 against Spike AI's 3.1. Stable Diffusion also leads on ratings volume (53 vs 11). Spike AI's advantage is in-app purchases (none vs 3) and review sentiment (71% vs 60%). On price, update cadence, ads and device support there is nothing between them.

Both are free to download. Stable Diffusion sells 3 in-app purchases, starting at $6.99 per 7 days. Spike AI asks for nothing beyond the download.

Stable Diffusion holds the better App Store score, 4.2 against 3.1. Both are backed by a comparable volume of ratings — 11 and 53 respectively. Written reviews complicate that: 71% of Spike AI's written reviews are positive against 60% of Stable Diffusion's, so the app with the better star average is not the one people write more warmly about.

Spike AI ships an update every 8 days, Stable Diffusion every 2 weeks. Both last shipped on October 30, 2026.

## The numbers

| Metric | Spike AI | Stable Diffusion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.1 (11 ratings)](https://appshunter.io/ios/app/spike-ai/id6749781844/reviews) | **[4.2 (53 ratings)](https://appshunter.io/ios/app/stable-diffusion-artrix/id6753811473/reviews)** |
| Number of ratings | 11 | **53** |
| Positive reviews | **71.4% of reviews** | 60.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 8 days** | Every 2 weeks |
| Monetization | **Free** | Freemium |
| Size | 121 MB | 151 MB |
| Requires iOS | 17.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 12+ |
| Developer | [Jan Stellmann](https://appshunter.io/developer/1832066618) | [RapidNova](https://appshunter.io/developer/1826052446) |

## What reviewers say

### Spike AI

[App page](https://appshunter.io/ios/app/spike-ai/id6749781844)

This AI chat application offers flexible model execution, allowing you to use cloud-based AI, your own on-device models, or connect to a remote server. It supports encrypted conversation syncing across devices and project organization for managing your AI interactions.

**Highlights:** Cloud-based AI chat, On-device model execution, Connect to OpenAI-compatible servers, Sync encrypted conversations, Organize chats in projects, Choose tools for tasks

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

**In-app purchases:** none


### Stable Diffusion

[App page](https://appshunter.io/ios/app/stable-diffusion-artrix/id6753811473)

Transform your imagination into stunning artwork with advanced AI. Describe your vision or upload a reference image to generate unique art in seconds. Explore niche styles and create with precision control.

**Highlights:** Stable Diffusion Engine, Image-to-Image transformations, Niche art styles, Multiple aspect ratios, Community gallery, Fast processing

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Weekly Premium Access | $6.99 | per 7 days |
| Yearly Pro Access Promo | $24.99 | per year |
| Yearly Premium Access | $39.99 | per year |


## Frequently asked questions

### Is Spike AI free?

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

### Is Stable Diffusion free?

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

### Which has better reviews, Spike AI or Stable Diffusion?

Stable Diffusion is rated higher. Spike AI averages 3.1 out of 5 from 11 ratings, while Stable Diffusion averages 4.2 from 53 ratings.

### Do Spike AI or Stable Diffusion have ads?

Neither Spike AI nor Stable Diffusion shows ads.

### Which is updated more often, Spike AI or Stable Diffusion?

Spike AI ships an update every 8 days, and Stable Diffusion every 2 weeks. Most recently, Spike AI was updated on October 30, 2026 and Stable Diffusion on October 30, 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.*