Flutter + Firebase boilerplate
Two apps. One backend.
Five verticals out of the box.
DuoKit is a production-ready Flutter + Firebase boilerplate for any two-sided service relationship — childcare, pet care, tutoring, eldercare, home cleaning. Swap one constant to retarget the apps.
Lifetime updates · Spark-plan friendly · iOS + Android
Everything a real two-sided service app needs
No half-finished features. Each piece is wired into both apps and documented for swapping out.
Two apps, shipped separately
Provider app + client app, separate iOS/Android bundles, separate App Store listings. No role-switching mess.
Firestore on the free tier
Designed to run on Firebase's free Spark plan for typical small-business loads. Tight security rules included.
5 vertical presets
Childcare, pet care, tutoring, eldercare, cleaning. Sections rename and disable themselves automatically.
Generic billing rules
Custom bonuses (Christmas, Eid, performance, year-end), monthly fees, leave deductions. Currency-agnostic.
Type-safe i18n
slang codegen, English shipped, hooks for any locale. No hard-coded strings (lint-enforced).
Push + threaded messages
FCM tokens, scheduled notifications, 10-minute message correction window, read receipts.
Real screens, real app
Captured from the boilerplate running on iPhone 17 Pro, signed into a fresh Firebase project. No mockups.
Branded sign-in
Google Sign-In, your wordmark, your accent color. Plug in your Firebase project and ship.
Provider dashboard
At-a-glance per-dependent stats and a 6-button Quick Actions grid that adapts to the active preset.
Attendance + leave
Month calendar, two-color leave overlays for provider and dependent, one-tap leave entry.
Billing settings
Studio info, bank info, prepaid/postpaid billing cycle, payment-due-day picker — all in one screen.
8 themes, swap on tap
Eight Morandi-soft palettes ship by default. Persisted per-user. Edit `app_theme.dart` to add your own.
Splash + native launch
Cream-on-cream native launch screen with the boilerplate logo. flutter_native_splash + flutter_launcher_icons configured.
Swap one constant. Retarget the app.
kActivePreset in lib/config/activity_presets.dart decides which daily-log sections appear and what they're called. Click a preset to preview.
const ActivityPreset kActivePreset = childcarePreset;
Default preset — every section enabled.
What you get
One zip download. Open in VS Code, run two flutter run commands, you're live.
provider_app/
iOS + Android Flutter app for the service provider.
- ✓Daily activity logging (5 sections, configurable)
- ✓Monthly billing with custom bonus rules
- ✓Medication orders + administration log
- ✓Attendance / leave calendar
- ✓Push notifications, threaded messages, photo capture
- ✓Studio profile, bank info, payment reminders
client_app/
iOS + Android Flutter app for the client.
- ✓Read-only daily-log view + check-in/out
- ✓Monthly bill view with payment status
- ✓Add their own records (feeding, sleep, etc.)
- ✓Threaded messages back to the provider
- ✓Invite-code binding flow
- ✓8 themes, locale-ready
firebase/
Backend you deploy in 5 commands.
- ✓Firestore security rules — provider/client authorization
- ✓Composite indexes for the queries that need them
- ✓Storage rules — photo upload paths
- ✓Optional Cloud Functions (invite-code, account deletion)
- ✓Reference functions/index.js with package.json
- ✓Honest README on Spark vs Blaze trade-offs
Documentation
Four buyer-facing docs, ~850 lines total.
- ✓README.md — what's in the box
- ✓SETUP.md — fresh-clone to running app
- ✓CUSTOMIZATION.md — 9 sections, least-invasive first
- ✓ARCHITECTURE.md — code map + Firestore schema + design rationale
One-time price. Lifetime updates.
Buy it once, use it on as many of your own apps as you want.
DuoKit
$199
USD · one-time
- ✓Full source for both Flutter apps
- ✓Firebase rules, indexes, optional Cloud Functions
- ✓5 vertical presets out of the box
- ✓4 docs (~850 lines) — README, SETUP, CUSTOMIZATION, ARCHITECTURE
- ✓Unlimited use in your own commercial apps
- ✓Free updates (v1.x)
- ✗Redistribution as a template not allowed
Secure checkout via Gumroad · Instant download
FAQ
What does the boilerplate include exactly?
Two complete Flutter apps (provider + client), Firebase security rules and indexes, optional Cloud Functions, and ~850 lines of documentation. Everything you need to ship a two-sided service app.
Can I run this on Firebase's free Spark plan?
Yes for the core app. Two features (invite-code binding + account deletion) need Cloud Functions which require Blaze. Free-tier Blaze usage for a small business is typically $0/month. firebase/README.md walks through the trade-off.
How do I switch from childcare to pet care / tutoring / eldercare?
Open lib/config/activity_presets.dart in both apps. Change `kActivePreset = childcarePreset` to `petCarePreset` (or any of the 5 presets). The daily-log sections rename and disable themselves automatically. Custom presets are a 30-line copy-edit.
Does it support iOS + Android?
Both, out of the box. The boilerplate uses Flutter for shared mobile code. iOS and Android folders are configured with the right bundle IDs (`com.duokit.provider` / `com.duokit.client`) — change them once and you're done.
What about web or desktop?
The Flutter projects can be set to build web/macOS/Windows/Linux too, but the boilerplate is mobile-first and the UI is tuned for phone screens. We recommend dropping the desktop folders unless you have a specific use case.
How is billing handled?
Per-dependent fee settings: monthly fee + meal fee + custom bonuses. Bonuses are a generic `BonusRule` (id, label, amount, payment month) so you can add Christmas, Eid, summer/winter, year-end, performance, etc. — whatever fits your market.
What languages does it support?
English ships out of the box. The slang i18n framework is wired in — you copy en.i18n.json to zh-TW.i18n.json (or any locale), translate the values, and re-run codegen. No hard-coded strings (lint-enforced).
Can I get a refund?
Yes — Gumroad's 14-day refund policy applies. Email me with your purchase ID.
Is there a license restriction?
Use it in unlimited commercial apps you ship. Don't redistribute the source as a template or course material.