edge_gen_ai 0.1.0

A Flutter plugin for on-device generative AI, wrapping Apple Foundation Models (iOS) and Gemini Nano via ML Kit GenAI (Android) behind one Dart API.

edge_gen_ai

A Flutter plugin for on-device generative AI. It wraps Apple's Foundation Models (iOS) and Google's Gemini Nano via ML Kit GenAI (Android) behind one Dart API — no network calls, no cloud API keys, no data leaving the phone.

It uses the model the OS already ships with, so there's no model file to manage; downloadModel() just triggers the OS's own on-demand delivery of that shared system model when it isn't ready yet.

Important

Platform versions matter a lot here:

• iOS 26+ required, with Apple Intelligence enabled in Settings. iOS 27+ required for image input (Foundation Models Attachment, Beta).
• Android API 26+ on a device with Gemini Nano/AICore support (e.g. Pixel 8+, Samsung S23+). Android's backend is Beta — ML Kit GenAI APIs have no SLA or backward-compatibility guarantee. See ML Kit GenAI.

Use checkAvailability() to detect unsupported OS versions, disabled Apple Intelligence, or missing AICore support at runtime.

Features

Class	Task	Details	Screenshot
EdgeGenAIPrompt	generateContent()	Free-form prompt, streamed response, optional image input and conversation memory.	[generateContent]
EdgeGenAISummarizer	summarize()	Summarizes text as bullet points.	[summarize]
EdgeGenAIProofreader	proofread()	Fixes grammar, spelling, and punctuation.	[proofread]
EdgeGenAIRewriter	rewrite()	Rewrites text in a chosen EdgeGenAIRewriteStyle.	[rewrite]
EdgeGenAIImageDescriber	describeImage()	Describes an image.	[describeImage]

Every class exposes checkAvailability() and downloadModel() alongside its task method. On Android these map to ML Kit GenAI's dedicated APIs; on iOS they're task-specific prompts to the same Foundation Model that backs EdgeGenAIPrompt.

• Availability + download: checkAvailability() reports ready / downloadable / not-enabled / unsupported. downloadModel() streams download progress on Android; on iOS it completes immediately (nothing to download).
• Conversation memory: EdgeGenAIPrompt(useMemory: true) remembers prior turns; resetConversation() starts over. Stateless by default.

Usage

import 'package:edge_gen_ai/edge_gen_ai.dart';

final prompt = EdgeGenAIPrompt();

// 1. Check whether the on-device feature is ready.
final availability = await prompt.checkAvailability();

// 2. If needed, download it (no-op on iOS).
if (availability == EdgeGenAIAvailability.downloadable) {
  await for (final progress in prompt.downloadModel()) {
    print('${progress.status}: ${progress.bytesDownloaded ?? ''}');
  }
}

// 3. Generate content. Each event is the full text generated so far.
await for (final chunk in prompt.generateContent(
  'Write a 3 sentence story about a magical dog.',
  options: EdgeGenAIGenerationOptions(temperature: 0.8, maxOutputTokens: 256),
)) {
  print(chunk);
}

// Optionally attach a single image (encoded bytes, e.g. PNG or JPEG).
await for (final chunk in prompt.generateContent(
  'What is in this picture?',
  image: imageBytes,
)) {
  print(chunk);
}

Hold a memory-enabled conversation across calls:

final chat = EdgeGenAIPrompt(useMemory: true);
await for (final chunk in chat.generateContent('My name is Alex.')) {}
await for (final chunk in chat.generateContent('What is my name?')) {
  print(chunk); // remembers "Alex"
}
await chat.resetConversation(); // start fresh

Use the task-specific features (each has its own checkAvailability() / downloadModel(), exactly like EdgeGenAIPrompt):

final summary = await EdgeGenAISummarizer().summarize(longArticle);

final corrected = await EdgeGenAIProofreader().proofread('the quick brown fox jumsp');

final formal = await EdgeGenAIRewriter().rewrite(
  'hey, meeting is off',
  style: EdgeGenAIRewriteStyle.professional,
);

final description = await EdgeGenAIImageDescriber().describeImage(imageBytes);

See the example app for a chat UI and a text-tools demo built on top of this API.