LocalPixHow to run Stable Diffusion on iPhone and iPad
Stable Diffusion can run directly on an iPhone or iPad: the model is converted to Apple's Core ML format and executed on the Neural Engine, so no PC, GPU server or cloud account is needed. The simplest way is an app that ships ready-converted models. LocalPix includes seven Stable Diffusion-based models (Stable Diffusion 2.1, Realistic Vision, MeinaMix, DreamShaper, ToonYou, Openjourney and ReV Animated), each about 1 GB, that generate images offline in seconds on iOS 18 or later.
How Stable Diffusion runs on an iPhone
Stable Diffusion is an open image-generation model. To run on Apple devices, it's converted with Apple's Core ML tools (Apple publishes the open-source ml-stable-diffusion project for this). The conversion splits the model so the heaviest parts run on the Neural Engine, Apple's dedicated machine-learning processor, and compresses the weights (palettization) so a full model fits in about 1 GB.
The result is a model that generates 512 × 512 images locally, without an internet connection and without a graphics card.
Which Stable Diffusion models are available in LocalPix?
| Style | Model | Best for | Size |
|---|---|---|---|
| Default | Stable Diffusion 2.1 (Apple, palettized) | Fast general-purpose images | ≈ 1.1 GB |
| Realistic | Realistic Vision v5.1 | Photoreal people and scenes | ≈ 0.9 GB |
| Anime | MeinaMix v10 | High-quality anime illustration | ≈ 0.9 GB |
| Fantasy | DreamShaper 8 | Fantasy worlds and illustration | ≈ 0.9 GB |
| Cartoon | ToonYou | Stylized cartoon characters | ≈ 0.9 GB |
| Artistic | Openjourney v4 | Painterly, Midjourney-style art | ≈ 0.9 GB |
| 2.5D | ReV Animated | Fantasy and game-style characters | ≈ 0.9 GB |
Do you need a computer to use Stable Diffusion on iPhone?
No. Converting a model yourself requires a Mac and Python tooling, but apps such as LocalPix ship models that are already converted and optimized for the Neural Engine. You download a model inside the app and start generating on the phone.
Performance and requirements
- System: iOS 18 or iPadOS 18 or later.
- Recommended devices: iPhone 12 (A14 Bionic) or newer, or an iPad with an M-series chip.
- Speed: about 8 seconds for a 20-step image on iPhone 16 Pro Max; older devices are slower.
- Storage: about 1 GB per model, downloaded only when you choose a style.
Stable Diffusion settings you can control on iPhone
- Prompt: describe subject, style, mood and lighting.
- Negative prompt: things to avoid, such as blur or extra fingers.
- Steps: more steps add detail but take longer (20–25 is a good default).
- Guidance scale: how strictly the image follows the prompt (around 7 is typical).
- Seed: fix it to reproduce an image or vary it for new results.
- Image-to-image: start from your own photo and describe the change; LocalPix calls this AI Edit.
In LocalPix, the advanced controls and AI Edit are part of LocalPix Pro.
Other ways to use Stable Diffusion on iPhone
Other on-device options exist, such as Draw Things, which targets advanced users with many community models and settings. Cloud-based apps and web services also offer Stable Diffusion, but they upload your prompts and need a connection. LocalPix focuses on a curated set of seven ready-to-use models, a simple interface and fully offline, private generation.
Run Stable Diffusion on your iPhone
- Install LocalPix. Get LocalPix: Offline AI Art from the App Store (iOS 18 or later).
- Pick a model. Choose a style such as Realistic or Anime and download its Stable Diffusion model (about 1 GB, Wi-Fi recommended).
- Write a prompt. Describe what you want to see, including style and lighting.
- Generate offline. Tap Generate. The Neural Engine creates the image on the device in seconds, with or without internet.
Questions and answers
Can Stable Diffusion run on iPhone?
Yes. Stable Diffusion models converted to Core ML run on the iPhone's Neural Engine. Apps like LocalPix include ready-converted models, so no computer or cloud service is required.
Is Stable Diffusion on iPhone free?
The Stable Diffusion models are open (CreativeML Open RAIL-M licenses). LocalPix is free to download; unlimited generation and all seven models are included in LocalPix Pro.
What image size does Stable Diffusion produce on iPhone?
The models in LocalPix generate 512 × 512 images, the native resolution of Stable Diffusion 1.5 and 2.1 base models.
Does Stable Diffusion on iPhone work offline?
Yes. After the model is downloaded, generation runs entirely on the device and works in airplane mode.