UI Kit lineage
Open source1,000+ widgets · 23K monthly pub.dev downloads
Flutter mobile app development, AI inside Flutter, and honest cross-platform engineering — from the team that publishes the GetWidget Flutter UI Kit (4,811★ on GitHub · 23K monthly pub.dev downloads · 1,000+ widgets). Flutter app development services, flutter app development agency engagements, and hire-flutter-developer staffing — with transparent pricing from a $3K audit.
The SERP for flutter app development company is full of agencies promising Flutter expertise. None of them publishes a Flutter library, prices their work on-page, or ships AI inside the mobile apps they build. We do all three — these are the three reasons buyers pick us once they read past page one.
Most Flutter app development companies claim Flutter authority. We can prove it: the GetWidget Flutter UI Kit is on pub.dev with 23,000 developers downloading it every month and 4,811 stars on GitHub. The Flutter developers who'd build your app are the same engineers who maintain a library the wider Flutter community uses.
Voice copilots, RAG-backed chat UIs, vision pipelines, streaming AI widgets — we ship these inside Flutter apps, not as separate microservices stitched in by another vendor. Our four V2 sibling pillars (Claude · OpenAI · automation · integration) prove the AI side is real, not a service-page bullet.
A $3K Flutter audit · $10–25K fixed-price pilot · from $5K/month for a continuous embedded squad. With an explicit walk-away clause: if the audit shows we can't move the metric, no phase 2. No "contact us for a quote" black box. The pricing is on the page for the same reason the OSS code is on GitHub.
From custom Flutter app development to cross-platform mobile app development to AI inside Flutter — these are the patterns we ship most often. Each one comes with a fixed-fee audit option, a defined kill-point, and a runbook the in-house team takes over when our engagement ends.
Full-cycle Flutter app development services for iOS, Android and Flutter web. Greenfield builds, MVPs, and production launches. Type-safe Dart, Riverpod or Bloc, Firebase / Supabase / your-own-backend integration, CI/CD via Codemagic or GitHub Actions, store submission and post-launch monitoring.
Most agencies wire up Material defaults; we wrote a UI kit because the defaults aren't enough. Design-system-led UI/UX with a component library extending our open-source widgets — buttons, lists, cards, carousels, charts, forms — tuned for accessibility and brand fit before code is written.
Cross-platform mobile app development with Flutter — one Dart codebase shipping native binaries for iOS and Android plus a Flutter web build where it makes sense. Where a platform-channel bridge to native Swift / Kotlin earns its complexity, we add it; where it doesn't, we don't.
Realtime voice agents (OpenAI Realtime API) embedded in Flutter, RAG-backed chat UIs over your private docs, vision pipelines (camera-to-structured-JSON), and streaming AI widgets. The differentiator no Flutter shop on this SERP discusses — see the next section.
Migrating a legacy native iOS/Android app or a struggling React Native codebase to Flutter. Shipped-pattern process: route-by-route incremental migration behind a feature flag, side-by-side metrics, walk-away clause if the data doesn't move. No big-bang rewrites.
Embedded squad picks up an existing Flutter app — Dart / Flutter version upgrades, dependency hygiene, crash and ANR triage, store-policy compliance, performance budgets enforced via integration tests. Most teams take this on after our pilot ships.
We've shipped Flutter for food delivery, fintech, field service, enterprise internal tools, and consumer health. Tell us what's on your roadmap — the Flutter audit will tell you which slice is worth shipping first.
Tell us your Flutter scopeZero of the Flutter app development companies on this SERP discuss AI features inside the mobile app. We ship them. Pick a pattern on the left — voice agent, RAG chat, vision, or streaming widget — and see the Flutter integration shape. The code you're looking at is the code we'd ship in week one of your pilot.
import 'package:flutter/material.dart';
import 'package:getwidget/getwidget.dart';
import 'package:gw_ai/realtime.dart';
class VoiceCopilot extends StatefulWidget {
@override
State<VoiceCopilot> createState() => _VoiceCopilotState();
}
class _VoiceCopilotState extends State<VoiceCopilot> {
late final RealtimeSession session;
@override
void initState() {
super.initState();
session = RealtimeSession(
model: 'gpt-realtime-2',
tokenEndpoint: '/api/realtime/token', // ephemeral, server-issued
tools: [searchOrders, openTicket],
);
session.connect();
}
@override
Widget build(BuildContext context) {
return GFCard(
content: StreamBuilder<RealtimeEvent>(
stream: session.events,
builder: (_, snap) => VoiceVisualizer(state: snap.data),
),
);
}
} No big-bang Flutter rebuild promises and no scope-as-we-go hand-waving. Four phases, milestone-billed, with a walk-away kill-point after the prototype if Flutter isn't the right call. Most teams ship to TestFlight + Play Internal between weeks 6 and 10.
Fixed-fee $3K audit. We map your existing app (or greenfield brief), evaluate cross-platform fit honestly (Flutter vs React Native vs native), score each candidate feature on effort × ROI, and surface the real risks — store policies, platform-channel needs, AI cost projections. You leave with a 90-day Flutter roadmap and the math behind it.
We prototype the highest-uncertainty screen first — usually the one combining UI density, a platform-channel bridge, or an AI feature. Design-system decisions land here: which GetWidget components extend cleanly, which need custom work. You see the real interaction on a real device, not a Figma deck.
Fixed-price pilot: one production-ready Flutter app or feature stream shipped behind a feature flag. CI/CD via Codemagic or GitHub Actions, automated integration tests, crash reporting (Sentry / Firebase Crashlytics), and analytics wired before launch. Weekly demos against the acceptance criteria from the audit.
Embedded squad takes the app forward — Dart / Flutter version bumps on schedule, dependency hygiene, store-policy compliance, performance budgets enforced in CI, monthly cost-of-ownership report. Cancel any month. Most teams move here after the pilot ships.
Cross-platform mobile app development isn't a single answer. The honest comparison across seven dimensions — pulled from shipped Flutter, React Native, and native client work, not benchmarks. You're here on the Flutter row; we'll tell you the cases where React Native or native is the right pick.
When NOT to pick Flutter: when 70%+ of the app is deep-OS-API work (ARKit, custom BLE GATT, Apple Watch / Wear OS primary), when your hiring pool is JS-heavy and you can't realistically staff Dart, or when you need the smallest possible install size. We say so on every audit call.
A 30-minute fit call — we'll tell you honestly whether Flutter, React Native, or native is the right pick for your roadmap. No pitch.
Vendor-agnostic on backend and AI model, opinionated on the Flutter stack itself. The list below is the most common — we deviate when your codebase or platform constraints demand it.
GetWidget is the open-source Flutter UI library our team has built and maintained since 2017 — 1,000+ widgets shipped on the world's most-installed Flutter component library, downloaded by 23,000 developers every month. Most Flutter app development companies on this SERP claim authority. We can show ours: 4,811 stars on GitHub, eight years of in-production patterns, and a public commit history. When you hire us, you hire the team that wrote the library.
Four anonymized capability patterns from real engagements — two AI-inside-Flutter, one cross-platform migration, one enterprise rebuild on the GetWidget foundation. Named references shared under NDA once we know what you're building.
Top-of-funnel customers were dropping off the search-and-filter flow on a Flutter food-delivery app. Typed search was good; voice search was missing on Android and broken on iOS.
Embedded a Flutter voice agent backed by OpenAI Realtime API (gpt-realtime-2) — bidirectional audio over WebRTC, sub-second first-token latency, function-calling into the existing order-search API. Built using GetWidget Card + custom voice-state visualizer widget; auth via short-lived backend-issued ephemeral keys.
Field technicians using a Flutter inspection app had to flip out to a separate web portal to read SOPs and equipment manuals — eating ~20 minutes per visit and leading to inconsistent diagnoses.
RAG agent over the existing SOP corpus (pgvector + Claude Sonnet 4.6) exposed as a streaming chat panel inside the Flutter app. Citations rendered as GetWidget GFListTile rows the tech can tap to open the source PDF. Offline-tolerant: queues questions until reconnect.
Mid-size fintech maintaining two divergent native codebases — Swift on iOS, Kotlin on Android — that had drifted on feature parity. Roadmap was 40% feature work, 60% reconciliation work.
Incremental route-by-route migration to Flutter behind a feature flag. Old native screens stayed live while Flutter screens shipped one at a time; a thin platform-channel bridge kept legacy auth + biometric flows untouched. Walk-away clause at week 6 if performance regressed on the in-app trading screen.
Enterprise client had a Flutter app built by a previous vendor — inconsistent components, no design tokens, 12-second cold-start, 2.4% crash rate. The team wanted a rebuild without a 12-month freeze on feature work.
We rebuilt the foundation on extended GetWidget components + a tokenized design system, replaced Bloc-spaghetti with Riverpod, set a CI performance budget (cold-start under 2.5s, crash-free sessions over 99.6%). Shipped feature work continued throughout in a parallel branch.
Same pricing as our other engagements — $3K audit, $10–25K pilot, from $5K/mo continuous. Most teams begin with a one-to-two-week Flutter audit to scope, then run a 5–8 week pilot on the highest-ROI workstream, then move to monthly for the next milestones.
Find whether Flutter is the right call — and which features pay back fastest.
One Flutter MVP or feature stream shipped end-to-end — not a prototype.
Embedded squad shipping the next Flutter milestone on your roadmap.
Three engagement tiers, on the page, not buried. A one-to-two-week Flutter audit is $3,000 fixed — cross-platform fit review, existing-app health check, per-feature effort × ROI ranking, and a 90-day roadmap. A Flutter pilot (one MVP or feature stream shipped end-to-end) is $10,000–$25,000 fixed price over 5–8 weeks. A continuous Flutter team is from $5,000 per month — embedded squad shipping the next milestone, cancel any month. The main cost drivers we surface in the audit: number of native platform-channel bridges (Bluetooth, ARKit, biometrics), whether AI features are in scope, and whether a separate Flutter-web build is needed. Most teams underestimate platform-channel work and overestimate the cost of AI features.
Realistic distribution from shipped client work: a simple Flutter MVP (one user persona, no native integrations, no AI features) ships to TestFlight + Play Internal in 5–7 weeks. A production-ready launch (App Store + Play Store, analytics, crash reporting, basic backend) typically lands in 10–14 weeks. A more complex Flutter app development project — multi-persona, native integrations, AI inside the app, separate Flutter-web build — runs 14–20 weeks. We don't quote a 30-day timeline for work that takes 90 days; the audit phase tells us which bucket you're in before any contract.
Honest answer: not always Flutter. Pick Flutter when you need pixel-identical UI across iOS + Android (single Skia/Impeller renderer), a Flutter web build from the same codebase, or modern AI streaming UX where 60fps text and waveform rendering matter. Pick React Native when your hiring pool is JavaScript-heavy and you can't realistically staff Dart, or when most of the app is thin wrappers over native iOS/Android components. Pick native (Swift + Kotlin) when the app is genuinely 70%+ deep-OS-API work — ARKit, CoreML on-device, Bluetooth Low Energy with custom GATT profiles. We've shipped Flutter, advised against Flutter, and migrated apps both into and out of Flutter — the comparison table above is the same matrix we use in audit calls.
Hire Flutter developers in-house when you have a multi-year Flutter roadmap (12+ months of continuous app work) and an engineering manager who can interview Dart skill credibly. Go with a Flutter app development agency when you need a senior Flutter team for a specific phase — MVP, major rebuild, migration, or an AI-features push — without the 6–9 month hiring ramp. We're an agency that often hands off to in-house teams: we'll build, document and run the GetWidget-component-system foundation so an in-house Flutter team can take it forward. The sibling page <a href="/hire-flutter-developer/">hire Flutter developers</a> goes deeper on the in-house-vs-agency tradeoff.
Yes — and it's typically less painful than retrofitting AI into a native iOS/Android stack because Flutter's reactive widget model and Stream-based plumbing are a natural fit for streaming AI UX. Four patterns we ship most often inside existing Flutter apps: (1) Realtime voice agents on the OpenAI Realtime API (gpt-realtime-2), embedded as a Flutter widget with WebRTC underneath; (2) RAG-backed chat over your private docs with streaming tokens and inline citations; (3) Vision pipelines that turn the device camera into a structured-JSON feed (receipts, IDs, equipment, ML on-device fallback); (4) Streaming AI widgets — token-by-token text, animated transitions, live captions. The audit ranks which pattern fits your app and projects token-cost. See also: <a href="/services/openai-development/">OpenAI development</a>, <a href="/services/ai-integration-services/">AI integration services</a>.
Flutter has been production-ready for enterprise apps for several years — Google Pay, BMW, eBay Motors, Toyota's vehicle UI, and Alibaba have all shipped large-scale Flutter apps in production. The honest enterprise risks aren't technical, they're organizational: (a) Dart talent depth in your hiring market vs JavaScript/Kotlin; (b) Flutter web maturity for desktop-class internal tools (good for many use cases, not all); (c) deep platform-specific integrations that need platform-channel bridges and a small native team alongside. Our enterprise Flutter development work is usually rebuilds on a tokenized design system + GetWidget component foundation, with explicit performance budgets enforced in CI (cold-start, crash-free sessions, frame budget). The case study above on the enterprise Flutter rebuild is representative.
Yes — Flutter ships an <code>add-to-app</code> mode that embeds a Flutter module inside an existing UIKit / SwiftUI / Android Compose app, sharing data via platform channels. We've shipped this both directions: adding Flutter screens to native apps (incremental migration), and adding native screens to Flutter apps (when deep-OS-API work is genuinely native-only). The honest cost/risk callout: add-to-app increases build complexity, binary size, and CI time, and you maintain two language toolchains. We recommend it when a single workflow inside your native app needs Flutter's UI velocity or a streaming AI widget; we recommend against it when the goal is just to "try Flutter" in a corner of the app.
GetWidget is the open-source Flutter UI library our team built and maintains — 1,000+ widgets across forms, lists, cards, avatars, carousels, charts, toasts, navigation and more. It's on <a href="https://github.com/ionicfirebaseapp/getwidget" target="_blank" rel="noopener">GitHub</a> with 4,811 stars and on <a href="https://pub.dev/packages/getwidget" target="_blank" rel="noopener">pub.dev</a> with 23,000 monthly downloads — a Flutter UI kit / Flutter UI library / Flutter widgets library actively used by tens of thousands of developers. It matters for our agency work for one reason: the engineers who'd build your Flutter app are the same team that has shipped, debugged, and supported 1,000+ Flutter components in production for eight years. That's a hiring signal no competing Flutter app development company on this SERP can match. Deeper walkthrough on <a href="/open-source/">our open-source page</a>.
Honest list, because the engagement works better when scope is clear: (1) Sub-$10K builds — the audit + onboarding overhead doesn't fit; freelance Flutter developers are a better fit at that price point. (2) Pure design-system work without development — we don't ship Figma libraries as a deliverable; we ship components and the design system that goes with them. (3) Native-only specialty apps where genuinely 70%+ of work is deep-OS-API (heavy ARKit, custom Bluetooth GATT, Apple Watch / Wear OS as primary surface) — we'll say so in the audit and recommend you go native. (4) Crypto / unregulated trading / get-rich-quick fronts — we just don't take this work. The walk-away clause in our audit and pilot exists for the same reason: if the data shows we can't move the metric, no phase 2.
Book a Flutter app development audit. We'll review your existing Flutter app (or greenfield brief), give you an honest Flutter-vs-React-Native-vs-native call, rank each feature on effort × ROI, score where AI inside Flutter pays back, and ship a 90-day Flutter roadmap. Fixed-fee $3K. No deck, no obligation to build.
Flutter often connects to the AI engineering siblings, the hire-side intent, or the open-source library that started this whole shop. These pages go deeper.
Sister pillar — hire-side intent. When in-house Flutter wins, when an agency wins, and how staff augmentation fits in.
Read more 02The Flutter UI library that powers our agency work. 4,811★ on GitHub, 23K monthly pub.dev downloads, 1,000+ widgets.
Read more 03The umbrella AI pillar — operator-grade AI dev across Claude, GPT, and open-weights. Pair with Flutter for AI-in-mobile.
Read more 04Hire OpenAI developers for the Realtime API voice agents and GPT-5.4 vision pipelines we embed inside Flutter apps.
Read more 05Plug GPT, Claude, or your model of choice into Salesforce, NetSuite, Zendesk and 50+ platforms — including from inside Flutter.
Read more 06Production chatbots — voice, WhatsApp, web — built on Sonnet 4.6 + GPT-5.4-mini. Embed them as a Flutter screen or a standalone surface.
Read more