u/OptimisticPrompt

Prompt: spaceship landing on an alien planet, 4k, cinematic shot

Generated locally on my iPhone 17!

I’ve been working on PhoneDiffusion, a local AI image generator for Apple Silicon devices and wanted to share a demo with people who actually use Stable Diffusion.

The main idea is that you can run image generation directly on iPhone, with no cloud inference. I tested it in airplane mode with Wi-Fi and mobile data disabled so you can see it's 100% offline.

Current version includes Stable Diffusion 1.5 and SDXL models, with different defaults specifically depending on the device.

Why I think this is useful:

• quick, beginner friendly mobile setup
• no prompt/image uploads to a server
• no credit system or cloud subscription
• useful for quick concept art, private generations, product shoots, etc.

This obviously is not meant to replace a full ComfyUI / A1111 desktop setup for advanced workflows, custom nodes, LoRAs, ControlNet-heavy pipelines, etc. The goal is a faster, simpler local Stable Diffusion app for iPhone/iPad/Mac users who want on-device generation without setting up Python or relying on cloud tools.

It launches on May 25, 2026 and you can already sign up on the App Store now to try it when it goes live (link in the comments).

I’d really like feedback from the Stable Diffusion community: what models, settings, benchmarks or workflows would you want tested first? What would you use it for?

Small note about the video: I actually had Low Power Mode turned on by mistake. SD 1.5 generation usually takes 4-6 seconds on my base iPhone 16.

Mobile app generation settings: default, low power mode off - took about 8sec to generate it using my iPhone 17.

Stable Diffusion model: RealVisXL v5 lightning

Wifi off / truly local generation

Welcome to the PhoneDiffusion FAQ.

PhoneDiffusion is an iPhone app for local Stable Diffusion image generation on iOS. This thread answers the common questions about privacy, supported devices, model downloads, free vs Pro features, and how PhoneDiffusion handles AI image generation on-device.

## What is PhoneDiffusion?

PhoneDiffusion is a mobile AI image generator for iPhone. It runs Stable Diffusion/Core ML model packs locally on iOS so you can create images from prompts directly on your device.

The goal is to make Stable Diffusion feel native to iPhone: simple prompt entry, curated models, useful settings, local image history, and device-aware performance.

## Is PhoneDiffusion on-device?

Yes. PhoneDiffusion is designed around on-device generation.

Prompts, negative prompts, generated images, render history, local metadata, and downloaded model files stay on your device unless you choose to share them.

## Do I need an account?

No account is required at launch. PhoneDiffusion is designed to work without a hidden profile, backend user account, or cloud sync.

## Where are generated images stored?

Generated images are stored locally in the app.

If you choose to save an image to Photos, PhoneDiffusion requests add-only photo library access and saves that image to your Photos library.

## What iPhones are supported?

PhoneDiffusion targets modern iPhones running iOS 26+.

The app routes devices by capability. Higher-end iPhones can use stronger SDXL-style model paths, mid-tier devices can use Stable Diffusion 2.1-style paths, and entry supported devices can use Stable Diffusion 1.5-style compatibility paths.

The app should choose the recommended model path automatically based on your device.

## How do model downloads work?

PhoneDiffusion uses curated Core ML model packs built for iPhone.

The goal is not random model-file chaos. The production app is intended to use reviewed model delivery and device-safe model choices, so users do not have to manually hunt down ZIP files or guess which model will run.

## What is free?

The free experience includes:

- Accountless app access

- A base curated on-device model

- Standard launch controls

- Local image generation on iPhone

## What does PhoneDiffusion Pro unlock?

PhoneDiffusion Pro is planned for power users who want more control.

Pro unlocks:

- Premium curated launch models

- Manual CFG control

- Manual diffusion step control

- Batch generation controls within device-safe limits

## What should I post in this subreddit?

Good posts include:

- AI images generated with PhoneDiffusion

- Prompts, negative prompts, model settings, and style comparisons

- Stable Diffusion on iPhone questions

- iOS performance notes and render times

- Bug reports and failed downloads

- Feature requests

- Model requests

- Beginner questions about prompts or settings

Please keep posts SFW, label AI-generated content clearly, and do not present generated people, screenshots, or events as real.

Download PhoneDiffusion for iPhone:

https://apps.apple.com/app/id6762061991