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On-Device AI Image Generator Phone App

An iPhone app that runs Stable Diffusion locally, so users get unlimited private images and you pay no GPU bills.

In plain English

This iPhone app makes pictures on the phone itself, so they stay private and can be made with no internet connection. You describe a picture or edit a photo you already have, filling a spot, removing the background, or making it sharper. People want as many images as they like, unlike apps that send the photo away and then limit them. They can start free, then pay a subscription or a one-time lifetime purchase. Nearly all of the picture work is done by the AI on the phone, and the maker still builds the app, helps it get found, and answers users.

Automation90%
Startup cost~$99
Time to first $1–3 mo
Monthly range*$3,000 Up to

$0–$3K+

DifficultyHard
SourceTrustMRR — PhoneDiffusion (RevenueCat-verified) ↗
Verified

Revenue independently checked: documents reviewed by a publication, or a public dashboard.

Apple Developer Program $99/yr is required to publish on the App Store. The founders did not disclose other costs. Models run on the user's phone, so there is no server/GPU bill.

The tool stack

Apple Core ML Stable Diffusion ↗
Free (open source)

Runs Stable Diffusion on-device on iPhone/Mac.

 RevenueCat ↗
Free up to a revenue threshold

In-app subscriptions and lifetime purchases.

 Apple Developer Program ↗
$99/yr

Publishing on the App Store.

Prices are the vendors' published list prices as researched in Oct 2026 and change often — always check the vendor's pricing page.

Step-by-step setup

  1. Ship a SwiftUI app with on-device Stable Diffusion: text-to-image, then photo edits (inpaint, background removal, upscale).
  2. Market it as 'unlimited, offline, private'. That is the hook against cloud apps with credit limits.
  3. Free tier plus paywall: weekly/monthly/yearly and lifetime plans via RevenueCat.
  4. Grow through App Store optimization (keywords such as 'offline AI image generator').

What's automated vs. the human 10%

The machine does

  • Image generation and editing (on the user's phone)
  • Billing and subscriptions

You still do

  • App development and model optimization
  • App Store optimization and support

Overview

PhoneDiffusion is made by Rok Gregorič and Rok Bozic (Slovenia, founded May 2026). TrustMRR shows $877 MRR, 241 active subscriptions, $9,478 all-time revenue and $3,230 in the last 30 days, verified through RevenueCat (snapshot Oct 22, 2026). Pricing ranges from $7.99/mo to $24.99 lifetime.

Costs

$99/yr for the Apple Developer Program. Other startup costs were not disclosed. Models run on the user’s phone, so there is no server GPU bill.

Realistic income

Verified but small. On-device quality and speed are limited by phone hardware. Treat this as a privacy-niche app, not a Midjourney replacement.

Risks

  • App rating is 3.9/5.
  • Model licenses and App Store content rules (NSFW filtering) apply.

*Income figures are illustrative ranges based on public pricing and typical outcomes reported by practitioners, not guarantees. Most new online businesses earn little or nothing at first. Not financial, legal or tax advice.

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