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You can run FLUX.2 klein on your iPhone with Off Grid AI Mobile (OGAM). If you have an iPhone with 12 GB of memory, such as the iPhone 17 Pro or iPhone Air, download FLUX.2 klein 4B (Light) once, about 5.3 GB, and you can make FLUX images on the phone with no internet and nothing uploaded.
It’s free, the model is Apache-2.0, and there’s no subscription or credit pack.
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What FLUX.2 klein is
FLUX.2 klein 4B is the small FLUX model from Black Forest Labs, released in January 2026. It has 4 billion parameters and finishes an image in 4 steps. Black Forest Labs says it needs about 13 GB of graphics memory on a PC. OGAM runs a quantized build that fits an iPhone with 12 GB of memory.
OGAM 0.0.122 (4 November 2026) added it to the Image tab, next to the Core ML Stable Diffusion models iPhones already had.
Which iPhones can run it
Apple doesn’t print memory on the box, so here’s the list. These iPhones have 12 GB:
- iPhone 17 Pro and iPhone 17 Pro Max
- iPhone Air
- iPhone 18 Pro and iPhone 18 Pro Max
The iPhone 17, iPhone 16 Pro and iPhone 15 Pro have 8 GB. FLUX.2 klein (Light) needs about 6.4 GB to run, and an 8 GB iPhone can’t spare that, so OGAM doesn’t show FLUX on those phones.
| FLUX.2 klein 4B (Light) | FLUX.2 klein 4B | |
|---|---|---|
| Download | About 5.3 GB | About 7.1 GB |
| iPhone memory | 12 GB | 12 GB, right at the limit |
| Quantization | Q4_0 | Q8_0 |
Each download includes the Qwen3 4B text encoder and the FLUX.2 VAE.
Start with the Light build. The full build only just fits inside the memory OGAM allows on a 12 GB iPhone, so it’s more likely to stop when other apps are open.
Phone support is new. FLUX.2 klein runs on Mac today.If it fails on yours, the Core ML models in the same tab are the proven choice.
Make your first FLUX image
- Install OGAM from the App Store, or update it to 0.0.122 or later.
- Tap Models in the bottom bar, then the Image tab.
- Type FLUX in Search models.
- Tap FLUX.2 klein 4B (Light) and download it. Use Wi-Fi, because it’s about 5.3 GB.
- Open a chat and ask for a picture: “draw a neon sign reading OPEN LATE in a rainy alley”. OGAM sees it’s an image request and sends it to your image model.
- To make every message a picture, tap Chat options next to the message box and set Image to ON. Auto lets the app decide.
If you have more than one image model, choose FLUX in the model picker’s image tab before you send. FLUX draws readable lettering, so a short word on a sign or a label is a good first test.
The style row above the message box works with FLUX too. Tap Photoreal or Anime before you send, or tap Restyle under a finished picture to draw it again in another look.
Once it’s downloaded, turn on airplane mode and ask for another picture. It still works, because nothing leaves the phone.
If something goes wrong
| What you see | Why | What to do |
|---|---|---|
| FLUX isn’t in the list | Your iPhone has 8 GB of memory, or the app is older than 0.0.122 | Update OGAM. On an 8 GB iPhone, use a Core ML model such as SD 1.5 Palettized |
| The app stops partway through an image | iOS ran short of memory | Close other apps and use the Light build |
| You want to edit one of your photos | The phone app uses FLUX for text-to-image only | Edit with FLUX on a Mac |
| Your iPhone is too small for FLUX but you want it | FLUX runs on Off Grid AI Desktop with 16 GB of memory | Make images on your computer from your phone |
FAQ
Can FLUX.2 klein run on an iPhone? Yes, on an iPhone with 12 GB of memory: the iPhone 17 Pro, 17 Pro Max, iPhone Air, 18 Pro or 18 Pro Max. Off Grid AI Mobile 0.0.122 added FLUX.2 klein 4B to its Image tab, and it shows the model only on iPhones with enough memory to load it.
Does FLUX.2 klein work on an iPhone 16 Pro or iPhone 17? No. Those have 8 GB of memory, and FLUX.2 klein (Light) needs about 6.4 GB to run, more than an 8 GB iPhone can spare. Off Grid AI hides it there. Use a Core ML Stable Diffusion model instead.
How big is the FLUX.2 klein download on iPhone? About 5.3 GB for FLUX.2 klein 4B (Light) and about 7.1 GB for the full build. Each includes the Qwen3 text encoder and the FLUX.2 VAE, and the app downloads them together.
Is FLUX.2 klein free on iPhone? Yes. Image generation is part of the free Off Grid AI app, and FLUX.2 klein 4B is released under Apache-2.0. There’s no account, no subscription and no limit on images.
Does FLUX.2 klein work offline on iPhone? Yes, after the download. The model runs on your iPhone, so you can turn on airplane mode and keep making images. Your prompts and pictures are never uploaded.
Related guides
- How to Run Z-Image Turbo on Your iPhone in 2026 (Offline AI Images, No Subscription)
- How to Run FLUX.2 Klein on Your Android Phone in 2026 (Offline AI Images, No Cloud)
- How to Generate AI Images Locally on Your iPhone in 2026 (No Cloud, No Subscription)
- How to Find AI Models Your iPhone Can Actually Run in 2026 (No Failed Downloads)
Get Off Grid AI on the App Store and check whether FLUX.2 klein shows up for your iPhone.