Private by default # Generate Images on Your iPhone. Nothing Leaves It. The latest FLUX.2 models, running fully on Apple Silicon. No account, no cloud, and your prompts and images stay on your device. Apple ID email I agree to receive my TestFlight invite and beta-related updates at this email address. Numen uses it only to manage beta access. Join the Beta No account. We email your TestFlight invite.[Privacy policy](/ko/privacy-policy) ![Abstract violet gradient with a faint aperture motif — illustrative hero image](data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%3D'0%200%201280%20960'%3E%3Cdefs%3E%3ClinearGradient%20id%3D'g'%20x1%3D'0'%20y1%3D'0'%20x2%3D'1'%20y2%3D'1'%3E%3Cstop%20offset%3D'0'%20stop-color%3D'oklch\(0.72%200.16%20275\)'%2F%3E%3Cstop%20offset%3D'1'%20stop-color%3D'oklch\(0.45%200.12%20275\)'%2F%3E%3C%2FlinearGradient%3E%3C%2Fdefs%3E%3Crect%20width%3D'100%25'%20height%3D'100%25'%20fill%3D'url\(%23g\)'%2F%3E%3Ccircle%20cx%3D'640'%20cy%3D'480'%20r%3D'172.79999999999998'%20fill%3D'none'%20stroke%3D'white'%20stroke-opacity%3D'0.5'%20stroke-width%3D'11.52'%2F%3E%3C%2Fsvg%3E) ## What Private Diffusion Does Six shipped features, no cloud required. - Text-to-Image GenerationType a prompt and Private Diffusion renders the image on your device, with no network call after the model download. - On-Device Prompt RewriteERNIE Image Turbo includes an on-device prompt enhancer that rewrites your text before generating — no prompt leaves your device. - Seed ControlPin a seed to reproduce a result exactly, or randomize to explore variations from the same prompt. - Resolution and Aspect RatioChoose small, medium, or large output and any of 7 aspect ratios to fit your subject. - Model SwitchingSwitch between five models in the app. Each downloads once and runs offline after that. - Biometric-Locked GalleryImages you mark private are locked behind Face ID or Touch ID and never leave your device. ## Five Models. One Download Each. All five run on Apple Silicon. Download a model once; it runs without a connection after that. Requires Apple Silicon and iOS, iPadOS, or macOS 26 or later. - Flux.2 Klein 4BRecommended 8 GBRecommended for all devices - FLUX.2 Klein 9B 16 GB · iPad, Mac - Z-Image-Turbo 12 GB iPhone · 16 GB iPad - ERNIE Image Turbo 16 GB · iPad, MacIncludes on-device prompt enhancer - Chroma1-Flash 16 GB · iPad, Mac ## Private by Default Weights download once. Prompts and images stay on this device. - No TrackingNSPrivacyTracking is false in the app's privacy manifest. Zero tracking domains. Zero collected data types. - No Cloud UploadPrivate Diffusion makes no app-code network calls after the model download. Generation runs entirely on-device. - No AccountThere is no sign-in, no profile, and no server that holds your data. The app works without one. - Works OfflineDownload a model over Wi-Fi once. After that, Private Diffusion generates images without a connection. - Biometric GalleryImages you mark private are locked behind Face ID or Touch ID. They live on your device and nowhere else. ## What It Makes - ![Placeholder tile for an upcoming sample: editorial portrait lit by violet rim light](data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%3D'0%200%20800%20800'%3E%3Cdefs%3E%3ClinearGradient%20id%3D'g'%20x1%3D'0'%20y1%3D'0'%20x2%3D'1'%20y2%3D'1'%3E%3Cstop%20offset%3D'0'%20stop-color%3D'oklch\(0.72%200.16%20275\)'%2F%3E%3Cstop%20offset%3D'1'%20stop-color%3D'oklch\(0.45%200.12%20275\)'%2F%3E%3C%2FlinearGradient%3E%3C%2Fdefs%3E%3Crect%20width%3D'100%25'%20height%3D'100%25'%20fill%3D'url\(%23g\)'%2F%3E%3Ccircle%20cx%3D'400'%20cy%3D'400'%20r%3D'144'%20fill%3D'none'%20stroke%3D'white'%20stroke-opacity%3D'0.5'%20stroke-width%3D'9.6'%2F%3E%3C%2Fsvg%3E) - ![Placeholder tile for an upcoming sample: surreal floating island at golden hour](data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%3D'0%200%20800%20800'%3E%3Cdefs%3E%3ClinearGradient%20id%3D'g'%20x1%3D'0'%20y1%3D'0'%20x2%3D'1'%20y2%3D'1'%3E%3Cstop%20offset%3D'0'%20stop-color%3D'oklch\(0.72%200.16%20275\)'%2F%3E%3Cstop%20offset%3D'1'%20stop-color%3D'oklch\(0.45%200.12%20275\)'%2F%3E%3C%2FlinearGradient%3E%3C%2Fdefs%3E%3Crect%20width%3D'100%25'%20height%3D'100%25'%20fill%3D'url\(%23g\)'%2F%3E%3Ccircle%20cx%3D'400'%20cy%3D'400'%20r%3D'144'%20fill%3D'none'%20stroke%3D'white'%20stroke-opacity%3D'0.5'%20stroke-width%3D'9.6'%2F%3E%3C%2Fsvg%3E) - ![Placeholder tile for an upcoming sample: macro photograph of dew drops on a spider web](data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%3D'0%200%20800%20800'%3E%3Cdefs%3E%3ClinearGradient%20id%3D'g'%20x1%3D'0'%20y1%3D'0'%20x2%3D'1'%20y2%3D'1'%3E%3Cstop%20offset%3D'0'%20stop-color%3D'oklch\(0.72%200.16%20275\)'%2F%3E%3Cstop%20offset%3D'1'%20stop-color%3D'oklch\(0.45%200.12%20275\)'%2F%3E%3C%2FlinearGradient%3E%3C%2Fdefs%3E%3Crect%20width%3D'100%25'%20height%3D'100%25'%20fill%3D'url\(%23g\)'%2F%3E%3Ccircle%20cx%3D'400'%20cy%3D'400'%20r%3D'144'%20fill%3D'none'%20stroke%3D'white'%20stroke-opacity%3D'0.5'%20stroke-width%3D'9.6'%2F%3E%3C%2Fsvg%3E) - ![Placeholder tile for an upcoming sample: flat-illustration fox in a geometric forest](data:image/svg+xml,%3Csvg%20xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg'%20viewBox%3D'0%200%20800%20800'%3E%3Cdefs%3E%3ClinearGradient%20id%3D'g'%20x1%3D'0'%20y1%3D'0'%20x2%3D'1'%20y2%3D'1'%3E%3Cstop%20offset%3D'0'%20stop-color%3D'oklch\(0.72%200.16%20275\)'%2F%3E%3Cstop%20offset%3D'1'%20stop-color%3D'oklch\(0.45%200.12%20275\)'%2F%3E%3C%2FlinearGradient%3E%3C%2Fdefs%3E%3Crect%20width%3D'100%25'%20height%3D'100%25'%20fill%3D'url\(%23g\)'%2F%3E%3Ccircle%20cx%3D'400'%20cy%3D'400'%20r%3D'144'%20fill%3D'none'%20stroke%3D'white'%20stroke-opacity%3D'0.5'%20stroke-width%3D'9.6'%2F%3E%3C%2Fsvg%3E) Placeholder artwork — real on-device samples land with the beta. ## Questions - Which devices does Private Diffusion run on? Private Diffusion requires an Apple Silicon chip and iOS, iPadOS, or macOS 26 or later. It runs on iPhone, iPad, and Mac. Intel Macs are not supported. - What does it cost? Private Diffusion is free in the TestFlight beta. The launch price has not been set. We will announce it before the App Store release. - Which models are included, and what hardware do they need? Five models ship with the app. Flux.2 Klein 4B is the recommended starting point and runs on any supported device with 8 GB of RAM. FLUX.2 Klein 9B, ERNIE Image Turbo, and Chroma1-Flash each need 16 GB and run on iPad and Mac. Z-Image-Turbo needs 12 GB on iPhone or 16 GB on iPad. Each model downloads once and runs offline after that. - Is it really private? The app makes no network calls after the model download. There is no analytics SDK, no crash reporter, and NSPrivacyTracking is false in the privacy manifest. Your prompts are never transmitted and your images never reach a server. The gallery's private section is locked with Face ID or Touch ID and stays on your device. - How does the beta work? Enter your Apple ID email in the form above and submit. We send you a confirmation email. Click the link in that email to confirm your address. Once confirmed, you are added to the waitlist. We send TestFlight invites in batches as spots open. ## Join the Beta [Join the beta](#beta)