A useful cross-platform app development shortlist should show which framework an agency has used, what it delivered, and how it handled the differences between platforms. A general mobile portfolio or a promise of a shared codebase leaves too many questions unanswered.
Callstack, Cheesecake Labs, Droids On Roids, LeanCode, Netguru, Propelius Technologies, Software Mansion, Somnio Software, and Very Good Ventures each have public service information and named project evidence involving React Native or Flutter. This guide compares that evidence and the questions buyers should ask before choosing a partner.
The focus is shared-code mobile delivery, native integrations, testing, accessibility, releases, and maintenance. For a broader starting point across mobile development approaches, see our mobile app development company guide.
Publisher disclosure: Propelius publishes this article and is included in the shortlist. Providers appear alphabetically, without numerical rankings. Project descriptions are company-reported unless another primary source is identified. Inclusion does not constitute independent verification of performance, quality, or suitability for your project.
We required a public development-service offering and a named project that explicitly identifies React Native or Flutter. A framework logo on a homepage, an unnamed client, or a generic mobile case study was insufficient on its own. Sources were reviewed on October 5, 2026.
Each profile identifies the service scope, relevant project evidence, and a project-specific question to resolve. Suggested reasons to investigate a provider are editorial interpretations of the published material. This is a researched shortlist, not a market-wide audit or shared performance benchmark.
The framework column below describes the evidence used in this article. It is not a complete inventory of each company's capabilities. Confirm the proposed team's recent experience, availability, commercial terms, and responsibilities directly.
| Agency | Framework evidence | Named project | Useful evaluation angle |
|---|---|---|---|
| Callstack | React Native | AutoZone | Migration from existing native apps |
| Cheesecake Labs | React Native and Flutter | CRU and SWFast | Framework choice and reusable product architecture |
| Droids On Roids | Flutter | Steelwrist InstallMate | Operational workflows and device features |
| LeanCode | Flutter | Crédit Agricole CA24 Mobile | Integration-heavy mobile products |
| Netguru | React Native | Sportano | Retail delivery with client-side integrations |
| Propelius Technologies | React Native | ChristmasPulse | AI-enabled consumer mobile applications |
| Software Mansion | React Native and Expo | Partiful | Existing-product enhancement and native modules |
| Somnio Software | Flutter | CrimeDoor | Media and specialized technology integrations |
| Very Good Ventures | Flutter | Hamilton | Consumer experiences and ongoing product evolution |
Callstack's React Native development offering includes application delivery, architecture, upgrades, and performance work. Its AutoZone case study describes a migration from separate native iOS and Android apps to React Native, including planning for a modular transition and connections between native and React Native screens.
This makes Callstack relevant to buyers evaluating modernization as well as new development. The published project is historical evidence, so request recent examples from the team proposed for your engagement.
Ask before hiring: Which features should migrate first, which native components should remain, and how will releases continue during the transition? Require an explicit rollback plan and ownership of the integration layer.
Cheesecake Labs offers product engineering across design, cross-platform mobile development, and supporting systems. Its development-process article also identifies React Native within its mobile toolkit.
Two portfolio examples provide specific framework evidence: CRU, an automotive community application using React Native, and SWFast, a white-label food-ordering application built with Flutter for Android and iOS. They support a conversation about framework choice and reusable application architecture.
Ask before hiring: Which framework would the proposed team choose for your requirements, and why? For a white-label product, ask how branding, configuration, customer-specific behavior, and releases will be managed without creating difficult-to-maintain copies.
Droids On Roids has a dedicated Flutter development offering. Its InstallMate case study describes a Flutter app for Steelwrist AB that supports product-installation workflows on Android and iOS.
The project material identifies QR-code scanning, multilingual instructions, and PDF completion certificates. It also names implementation and testing tools, giving buyers concrete engineering topics to discuss rather than only a visual portfolio.
Ask before hiring: How will camera permissions, scanning, document generation, and translated layouts be tested on your target devices? If field staff may have unreliable connectivity, make offline behavior and recovery explicit requirements rather than assuming they are included.
LeanCode's Flutter application-development services include architecture, automated testing, release management, and support. Its CA24 Mobile project documents work on Crédit Agricole Bank Polska's Flutter banking application. The project is also described in the official Flutter showcase.
That evidence makes LeanCode worth investigating for products with substantial integration and release-coordination requirements. A banking project is evidence of a particular engagement; it does not establish that another app automatically meets its own security or regulatory obligations.
Ask before hiring: How will the mobile team coordinate with your backend, security, and release owners? Request examples of automated critical-path tests and the proposed process for handling framework and dependency upgrades.
Netguru's React Native services cover design, development, testing, maintenance, and support. Its Sportano case study describes iOS and Android applications built using React Native, with a modular architecture and design system.
The account also describes collaboration with Sportano's engineers on integrations involving payments, logistics, and user accounts. That distinction matters: buyers should understand which work was delivered by the agency and which remained with the client.
Ask before hiring: Who owns each integration and its test environment? For commerce, request end-to-end checks of checkout, authentication, interrupted sessions, deep links, and platform-specific behavior, with clear responsibility for diagnosing failures across team boundaries.
Propelius's mobile development page lists Flutter and React Native services. For this comparison, the named project evidence is specifically React Native: the ChristmasPulse case study describes an iOS and Android application with image-generation and editing workflows, a Supabase backend, and modular festival-related content.
The case supports evaluating Propelius for a consumer mobile product that combines application delivery with AI integration. It does not establish a general performance benchmark or prove Flutter delivery for that particular project.
Ask before hiring: Request the proposed mobile test matrix, handling of slow or failed AI requests, image-permission behavior, accessibility checks, and the post-launch support scope. Apply the same evidence and handover requirements used for every provider in this guide.
Software Mansion's product-development offering identifies React Native and Expo within cross-platform delivery. Its Partiful case study describes enhancements to an existing product, including Android improvements, transparent-video integration, and iOS Live Activities through custom native modules.
This is useful evidence for buyers whose requirements extend beyond standard shared screens. The project account concerns development of existing applications; it should not be read as a claim that Software Mansion originally built the entire Partiful product.
Ask before hiring: Which parts of your app need native code, who will maintain those modules, and how will they be tested after operating-system or framework updates? Ask for a demonstration on both platforms, especially where the feature behaves differently.
Somnio's Flutter development services cover applications across multiple device types. Its CrimeDoor case study explicitly identifies Flutter and describes integrations including Unity for augmented reality, maps, subscriptions, and background podcast streaming.
The relevant evidence is the combination of a shared-code application with specialized integrations. Consider the project when evaluating how a proposed team will handle media features and third-party SDKs within a Flutter product.
Ask before hiring: How will the team validate third-party SDK compatibility, media behavior, memory use, and permission changes on representative devices? If you need web or desktop support as well, request a separate plan for those targets rather than assuming the mobile implementation transfers unchanged.
Very Good Ventures offers application-development services that include Flutter. Its Hamilton project provides a named example of a Flutter consumer application, and the company has published material about the app's continued evolution.
This makes the provider relevant to buyers investigating branded consumer experiences and the work required to maintain a product beyond its first release. Use the project as a starting point for technical questions rather than treating the app's visibility as a substitute for evaluating the proposed team.
Ask before hiring: How will shared design components support platform conventions and accessibility? Clarify the release, analytics, support, and knowledge-transfer responsibilities across the initial build and later product changes.
Cross-platform development shares parts of the implementation. It still requires deliberate decisions about platform differences. React Native's documentation explicitly supports platform-specific components and code, while Flutter's platform-channel documentation explains communication with native platform code.
Use the same requirements when comparing agencies, then ask framework-specific follow-up questions:
A strong proposal should explain how the app will be accepted on each platform and who will keep it working. Ask for concrete deliverables in these areas.
Request a device and operating-system test matrix, automated checks for critical flows, and manual testing for behavior that requires real hardware. Include weak networks, interrupted sessions, denied permissions, backgrounding, notifications, and offline recovery where relevant.
Flutter's testing guidance distinguishes unit, widget, and integration tests. Ask what the proposed suite covers, what it cannot cover, and how native integrations will be exercised. Agree on performance measurements for your app's critical flows instead of accepting generic framework benchmarks.
Ask for checks with VoiceOver and TalkBack, larger text, meaningful labels, focus order, sufficient contrast, and usable touch targets. Include errors, dialogs, and loading states. React Native's accessibility documentation notes platform differences, and Flutter's accessibility guidance provides implementation and testing considerations. Framework support alone is not evidence that your finished app is accessible.
Clarify who owns the developer accounts, store listings, signing setup, build pipeline, and release approvals. Ask who handles review feedback, failed submissions, and urgent fixes. The handover should let your authorized team reproduce a build and understand the release process without depending on one person's workstation.
Request a written plan for operating-system changes, framework upgrades, third-party SDK updates, dependency vulnerabilities, and production incidents. Distinguish defect support from new features and routine upgrade work. Confirm response expectations and how the application remains maintainable if your provider changes.
Ask an agency to compare native and shared-code approaches when a large part of the product depends on platform-specific features, unusual hardware integrations, or demanding real-time behavior. A focused prototype on representative devices can establish whether the proposed stack meets those requirements.
Native development may also be a reasonable choice when you initially need only one platform, already have a healthy native codebase, or have internal expertise that makes native ownership straightforward. Conversely, the existence of a native feature does not automatically rule out Flutter or React Native.
The buying question is how much shared code provides useful leverage after integration, testing, and maintenance are included. Require the agency to explain that tradeoff for your application rather than promising a universal saving or identical behavior on every device.
Give each shortlisted agency the same core flows, target platforms, device constraints, integrations, accessibility requirements, and expected support responsibilities. Ask it to identify assumptions and exclusions.
Separate design, application development, backend work, native integrations, testing, store release, and maintenance in the proposal. Do not compare an MVP-only estimate with a supported production release as if they cover the same outcome. This guide assigns no price bands, delivery promises, or percentage savings to the agencies.
The strongest choice is the team whose evidence matches your platform requirements and delivery needs. Start with a relevant named project, then verify the proposed team's role, native-integration experience, testing approach, and maintenance responsibilities. The alphabetical shortlist is not a ranking.
You can start with requirements if the framework is undecided. Ask agencies to explain their recommendation against your existing code, internal skills, integrations, target devices, and support plans. A provider's preferred framework is one input; a small technical trial can resolve important uncertainties.
No. Platform permissions, operating-system behavior, native dependencies, accessibility, and release processes still need validation. Agree on the devices and scenarios that matter to your users, and require evidence that critical flows work on each supported platform.
Request the source repository, architecture notes, dependency inventory, build and release instructions, test suite, known limitations, and operating documentation. Confirm ownership and appropriate access to store accounts and infrastructure. Have your team reproduce a build and release candidate as part of acceptance.
A relevant case study gets a provider onto the shortlist. A clear plan for native integrations, accessibility, testing, releases, and ongoing ownership should determine the next step.
If you are evaluating a cross-platform mobile product, discuss your requirements with Propelius. Bring the key user flows, integrations, and target devices so the framework and delivery approach can be assessed against the work you actually need.
Sources reviewed October 5, 2026. Confirm current service scope and project-team experience directly with each agency. Published case studies describe specific engagements and do not guarantee equivalent results elsewhere.
Need an expert team to provide digital solutions for your business?
Book A Free CallDive into a wealth of knowledge with our unique articles and resources. Stay informed about the latest trends and best practices in the tech industry.
View All articlesTell us about your vision. We'll respond within 24 hours with a free AI-powered estimate.
You bring the vision. We handle the build.
© 2026 Propelius Technologies. All rights reserved.
