What is it?
Cross-platform app development from GreeLogix — one Flutter codebase for iOS, Android, and optionally web/desktop, with shared logic, consistent UI, and device-matrix QA.
Cross-Platform Development
Cross-Platform App Development One Codebase, Every Screen
We build cross-platform apps with Flutter — one codebase for iOS, Android, and optionally web and desktop — with polished, near-native UI and QA, typically 30–50% cheaper than maintaining two native apps.
One codebase · iOS + Android (+ web/desktop) · 30–50% lower cost · QA on real devices
30 minutes · Senior engineer · No commitment
Upwork Top Rated Plus
Fiverr Level 2 · 5.0★
Clutch Verified Provider
150+ projects delivered
20+ Play Store apps
1
Shared Codebase
30–50%
Cost Savings
6–10wk
Typical MVP
20+
Apps Shipped
Why Cross-Platform with Flutter
One team, one codebase, consistent behavior everywhere.
iOS + Android from One Codebase
Ship both stores in sync — no drift between separate native builds.
Near-Native Performance
Flutter renders its own UI for smooth animations and consistent behavior.
Optional Web & Desktop
Reuse the same codebase for app-like web and desktop when it fits your users.
Shared Business Logic
Models, validation, and API layers written once and used everywhere.
Consistent Brand UI
Pixel-consistent custom UI across platforms, not lowest-common-denominator.
QA on Real Devices
Device matrix testing so behavior holds across screen sizes and OS versions.
Cross-Platform Scenarios
Where one codebase beats two native apps.
Startup Launch
B2C
Both stores
Reach iOS and Android users at once on a startup budget.
Consolidate Two Apps
2→1
Team
Merge separate iOS/Android teams into one Flutter codebase.
App + Web Portal
App+Web
Shared
Share code between the mobile app and an app-like web portal.
Enterprise Tooling
Internal
Multi-OS
Internal tools across mobile and desktop from one codebase.
Common Challenges
Cross-Platform Risks We Prevent
One codebase savings without a quality tax.
Platform edge cases
Ignoring permissions, back button, and notches hurts quality.
Weak architecture
Poor structure negates the savings of one codebase.
Wrong web-first choice
Using Flutter web for SEO content that needs a standard stack.
Why GreeLogix
Why GreeLogix for Cross-Platform
Flutter depth
20+ shipped apps with aggressive code sharing.
One accountable team
App, backend, and admin together.
Device-matrix QA
Real-device testing before every release.
Technologies
Stack & Architecture
Flutter 3DartRiverpodREST / GraphQLPostgreSQLFirebaseCI/CD
Industries Served
- Startups
- Service businesses
- Marketplaces
- Enterprise tooling
“What a 70-engineer team could not deliver, a small senior team at GreeLogix shipped. The app went from stuck to live across mobile, web, and backend.”
Quick answers
Cross-Platform App Development: Key Facts
Structured answers for search engines and AI assistants — definition, fit, cost, timeline, and comparisons.
- What is it?
- Cross-platform app development from GreeLogix — one Flutter codebase for iOS, Android, and optionally web/desktop, with shared logic, consistent UI, and device-matrix QA.
- Who is it for?
- Startups needing both stores on one budget Teams consolidating two native codebases Products wanting app + web from shared code Enterprises building multi-OS internal tools
- Who should not use it?
- Single-platform app with extreme native needs SEO-critical content website You require fully separate native teams
- How much does it cost?
- GreeLogix pricing tiers: Discovery Sprint: $1,500 – $4,000 — Platform plan, shared-scope map, and fixed build quote. Cross-Platform Build: $15,000 – $60,000 — iOS + Android (optionally web) from one Flutter codebase — with QA. Dedicated Team: $5,000 – $12,000 / mo — Embedded senior Flutter engineers for evolving cross-platform products.
- How long does it take?
- Discovery: 3–5 days. Cross-platform MVP: 6–10 weeks. Multi-platform product: phased quarters.
- How does it compare?
- Compared to alternatives — Native iOS + Android: choose when Extreme performance or deep OS features are core; React Native: choose when JS-native team or heavy JS module reuse. Choose GreeLogix when you need production reliability, fixed milestones, and engineer-led delivery with QA sign-off.
- When should you choose it?
- You want multiple platforms efficiently Consistent UX across devices matters You want one accountable team One codebase, lower cost Features stay in sync across platforms
Buyer Guide
What You Need to Know
Structured answers for founders, CTOs, and procurement — written for clarity in search and AI assistants.
Who needs it?
- ·Startups needing both stores on one budget
- ·Teams consolidating two native codebases
- ·Products wanting app + web from shared code
- ·Enterprises building multi-OS internal tools
Why GreeLogix?
- Flutter depth with 20+ shipped apps
- Aggressive code sharing, isolated platform code
- Backend and admin from one team
- Device-matrix QA before release
How it works
- 1.Platform plan and shared-scope map
- 2.Shared foundation and API layer
- 3.Feature sprints with device QA
- 4.Store and web launch
Typical timeline: Discovery: 3–5 days. Cross-platform MVP: 6–10 weeks. Multi-platform product: phased quarters.
How much does it cost?
GreeLogix pricing tiers: Discovery Sprint: $1,500 – $4,000 — Platform plan, shared-scope map, and fixed build quote. Cross-Platform Build: $15,000 – $60,000 — iOS + Android (optionally web) from one Flutter codebase — with QA. Dedicated Team: $5,000 – $12,000 / mo — Embedded senior Flutter engineers for evolving cross-platform products.
Cost factors
- ·Number of platforms (mobile, web, desktop)
- ·Feature and screen count
- ·Backend complexity
- ·Design fidelity
How long does it take?
Discovery: 3–5 days. Cross-platform MVP: 6–10 weeks. Multi-platform product: phased quarters.
How does it compare?
Compared to alternatives — Native iOS + Android: choose when Extreme performance or deep OS features are core; React Native: choose when JS-native team or heavy JS module reuse. Choose GreeLogix when you need production reliability, fixed milestones, and engineer-led delivery with QA sign-off.
- Native iOS + Android — choose when Extreme performance or deep OS features are core
- React Native — choose when JS-native team or heavy JS module reuse
When should you choose it?
- You want multiple platforms efficiently
- Consistent UX across devices matters
- You want one accountable team
Who should not use it?
- ·Single-platform app with extreme native needs
- ·SEO-critical content website
- ·You require fully separate native teams
Benefits
- One codebase, lower cost
- Features stay in sync across platforms
- Consistent brand UI everywhere
Risks to plan for
- Ignoring platform edge cases hurts quality
- Weak architecture negates the savings
- Choosing web-first Flutter for SEO content
Decision framework
When to Choose Cross-Platform App Development
Pros / benefits
- +One codebase, lower cost
- +Features stay in sync across platforms
- +Consistent brand UI everywhere
Cons / risks
- −Ignoring platform edge cases hurts quality
- −Weak architecture negates the savings
- −Choosing web-first Flutter for SEO content
Choose GreeLogix when
- You want multiple platforms efficiently
- Consistent UX across devices matters
- You want one accountable team
Implementation steps
- 1.Platform plan and shared-scope map
- 2.Shared foundation and API layer
- 3.Feature sprints with device QA
- 4.Store and web launch
Get a Clear Plan for Cross-Platform App Development
Talk to a senior engineer — scope, timeline, and cost range in one 30-minute call. No sales script.
Cross-Platform Done Right
Cross-platform used to mean compromise. With Flutter, one codebase delivers polished, near-native experiences on iOS and Android — and optionally web and desktop — while cutting cost and keeping features in sync. The catch is execution: architecture, state management, and platform-specific edge cases still matter.
GreeLogix builds cross-platform apps that feel first-class on every device. We decide which platforms are v1, share business logic aggressively, isolate platform-specific code, and QA on a real device matrix — so you get the savings of one codebase without the usual quality tax.
- Flutter as the default cross-platform engine
- React Native when a JS-native team benefits
- Backend and admin from the same team
- Device-matrix QA before every release
Frequently Asked Questions
Answers to the buyer questions we hear most before a project starts.
- What is cross-platform app development?
- Building one codebase that runs on iOS and Android (and optionally web/desktop) instead of separate native apps — reducing cost and keeping features in sync. We deliver it primarily with Flutter.
- Is cross-platform as good as native?
- For most business and consumer apps, yes — Flutter renders its own UI for near-native performance and consistent behavior. Native still wins for extreme graphics or deep OS-specific features.
- How much does a cross-platform app cost?
- $15,000–$60,000 depending on scope. One codebase typically costs 30–50% less than building two separate native apps.
- Which framework do you use?
- Flutter by default for UI consistency and performance. We advise React Native when a team is JS-native or heavy JS module reuse matters.
- Can one app target web and desktop too?
- Yes — Flutter targets web and desktop from the same codebase. We scope which platforms are v1 vs later based on your users.
- How long to launch a cross-platform app?
- A focused cross-platform MVP ships in 6–10 weeks; larger products phase over quarters.
Our Process
01
Platform Plan
Decide v1 platforms, shared scope, and edge cases.
02
Foundation
Shared architecture, navigation, API, and CI.
03
Build & QA
Feature sprints with device-matrix testing and demos.
04
Launch
Store/web deploy, analytics, and iteration backlog.
Building Cross-Platform?
Tell us your target platforms and product — we'll recommend the right approach within one business day.
Product Development
Related Development Services
Software, mobile, and rapid MVP paths — all from one senior product team.
Free Tools
Plan Before You Engage Us
Use our free calculators and planners — then book a strategy call when you are ready for a senior engineer review.
Resources
Continue Your Research
Case studies, guides, and free tools from the same engineering team.
Pricing Ranges
Cross-Platform App Development Investment
Transparent ranges based on app complexity, platform count, and engagement depth. Final quotes follow a scoping call.
Discovery Sprint
$1,500 – $4,000
Platform plan, shared-scope map, and fixed build quote.
- ·Platform priority
- ·Architecture brief
- ·Timeline
- ·Milestone plan
Most Popular
Cross-Platform Build
$15,000 – $60,000
iOS + Android (optionally web) from one Flutter codebase — with QA.
- ·Shared codebase
- ·Device-matrix QA
- ·Backend hooks
- ·Store/web launch
Dedicated Team
$5,000 – $12,000 / mo
Embedded senior Flutter engineers for evolving cross-platform products.
- ·Senior engineers
- ·PR-based delivery
- ·Release QA
- ·US/UK overlap
USD. Platform count, feature scope, and backend needs drive final quote.
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Cross-platform apps, MVPs, migrations, dedicated hire, comparisons, QA, and web/desktop — every Flutter page links back to this hub.
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