Cross-platform app development services

Having delivered 30+ cross-platform products with an NPS >85% score, we have the expertise to build your app for multiple platforms.
  • badge.name
    Top Software Development Company, 2025
  • badge.name
    Top IT Services Company, 2025
  • badge.name
    Top Software Development Company for Small Businesses
  • badge.name
    Top Software Development Company in Ukraine for Startups

01 | 03

Fortune #40 Global Health Leader

1886-founded, 131K employees, $16B in R&D

NYSE: EB

850k creators, 300M tickets sold in 2023

8th GPS App in the US

3M+ in 2023, 10M+ Google Play downloads

Cultural Exchange Led by 2K+ Team

Est. 1980, 500K+ Alumni, 100+ Countries

$12M Revenue Tech Co.

MBE Certified by NMSDC

Trusted Logistics Co. Since 1979

ISO9001 Certified Systems Integrator

3rd in Retail Inc. 5000

$6M+ raised, #1 ranked company in CT

UCSF-Trusted Health App

with 50K+ users in 60+ countries

Google-Funded Green Tech

144K Ha Monitored, Featured by Reuters

Telecom Experts Est. 2005

Google, Proximus & Orange partners

NASA-Trusted Workflows Builder

Est. in 2007; PCI, GDPR & HIPAA certified

Top Swiss Agency

Awarded #1 Swiss App in 2025

#2 SMM Agency in Australia

Serves 1k+ Australian B2B across 20+ domains

Google Cloud Partner

Trusted by Fortune 5 UHG

F&B Startup with 25K+ Guests/Y

4.5 on TripAdvisor, 600+ Dining Partners

Fortune #40 Global Health Leader

1886-founded, 131K employees, $16B in R&D

NYSE: EB

850k creators, 300M tickets sold in 2023

8th GPS App in the US

3M+ in 2023, 10M+ Google Play downloads

Cultural Exchange Led by 2K+ Team

Est. 1980, 500K+ Alumni, 100+ Countries

$12M Revenue Tech Co.

MBE Certified by NMSDC

Trusted Logistics Co. Since 1979

ISO9001 Certified Systems Integrator

F&B Startup with 25K+ Guests/Y

4.5 on TripAdvisor, 600+ Dining Partners

Google Cloud Partner

Trusted by Fortune 5 UHG

#2 SMM Agency in Australia

Serves 1k+ Australian B2B across 20+ domains

Top Swiss Agency

Awarded #1 Swiss App in 2025

NASA-Trusted Workflows Builder

Est. in 2007; PCI, GDPR & HIPAA certified

Telecom Experts Est. 2005

Google, Proximus & Orange partners

Google-Funded Green Tech

144K Ha Monitored, Featured by Reuters

UCSF-Trusted Health App

with 50K+ users in 60+ countries

3rd in Retail Inc. 5000

$6M+ raised, #1 ranked company in CT

Trusted Logistics Co. Since 1979

ISO9001 Certified Systems Integrator

$12M Revenue Tech Co.

MBE Certified by NMSDC

Cultural Exchange Led by 2K+ Team

Est. 1980, 500K+ Alumni, 100+ Countries

8th GPS App in the US

3M+ in 2023, 10M+ Google Play downloads

NYSE: EB

850k creators, 300M tickets sold in 2023

Fortune #40 Global Health Leader

1886-founded, 131K employees, $16B in R&D

F&B Startup with 25K+ Guests/Y

4.5 on TripAdvisor, 600+ Dining Partners

Google Cloud Partner

Trusted by Fortune 5 UHG

#2 SMM Agency in Australia

Serves 1k+ Australian B2B across 20+ domains

Top Swiss Agency

Awarded #1 Swiss App in 2025

NASA-Trusted Workflows Builder

Est. in 2007; PCI, GDPR & HIPAA certified

Telecom Experts Est. 2005

Google, Proximus & Orange partners

Π‘ross-platform development we offer

Development from scratch

Build cross-platform apps from scratch with one codebase β€” faster launch, lower costs, no duplicate effort.

Migrating from native to cross-platform

Migrate from native to React Native and manage one codebase for all platformsβ€”smooth performance, no extra overhead.

Upgrade your legacy app to a modern tech

Modernize your legacy app with a fast, scalable cross-platform frameworkβ€”built for easy maintenance and long-term growth.

Our cross-platform projects

01 | 03
01 | 03

Testimonials

01 | 02
01 | 03

How our cross-platform development looks

Here are the steps we go through together:

Discovery: Build the right foundation

Not sure whether to go fully cross-platform or take a hybrid route? We’ll help you figure it out. We’ve worked with both approaches across 200+ projects, so we know what works β€” and what doesn’t. From day one, our PMs, analysts, designers, and engineers join forces to map out your product strategy, pick the right tech setup, and plan a smooth delivery process. You’ll get a clear roadmap, the right team, and a setup that scales without headaches. We design the architecture to grow with your business β€” not just to get the app launched, but to keep it solid for years to come.

Learn more

Design: Platform-optimized interfaces

We design apps that look and feel right at home on both iOS and Android. By following Apple’s and Google’s design guidelines, we keep things smooth, native-like, and familiar to your users. Cross-platform mobile app development services are not about a one-size-fits-all approach. We tweak UI components where it makes sense, so everything works great across different devices, screen sizes, and input types. You’ll be part of the process from the start β€” reviewing designs, giving feedback, and making sure it all fits your brand. We also prep eye-catching visuals for the App Store and Google Play to help your app stand out and rank better.

Development: From code to app

We build cross-platform apps that feel almost native β€” minus the cost and complexity. With React Native, you get faster delivery and shared code for iOS and Android without cutting corners on quality. Our cross-platform app development services follow Agile principles, so the process stays flexible. You get regular demos, real-time feedback loops, and full control over what’s built and when. We keep scope in check and track everything with SPI and CPI, so your timeline and budget stay predictable. Weekly reports? Always. Surprises? Never. Just steady, transparent progress that gets your app in users’ hands, faster.

Testing: Consistency on every device

Great apps don’t just run β€” they run right, everywhere. We fine-tune for consistency across platforms while respecting each device’s quirks. Our cross-platform app development services adapt testing to your app’s needs. Lightweight project? We stick to code reviews and functional tests. Bigger app? We go deeper with automation, regression checks, security audits, and performance stress tests β€” all baked into a continuous testing flow. Whatever cross-platform solutions you need, we make sure they work cleanly across iOS, Android, and everything in between.

Deployment: Smooth launch, ongoing support

We handle the full launch process β€” prepping builds, managing App Store and Google Play submissions, and taking care of review questions and compliance checks. Even if it’s your first release, you won’t need to stress. Our cross-platform mobile application development services follow platform guidelines throughout development, helping your app pass review smoothly and avoid last-minute issues. With a 99.89% acceptance rate, we know how to get it right the first time. Once your app is live, we stay involved, reviewing real user feedback, fine-tuning the experience, and helping you adapt as your market evolves.

Growth: Continuous collaboration

Need to scale, add new features, or reach new markets? As your cross-platform development company, we’re here to help your app grow β€” not just keep up but stay ahead. We work with you to refine functionality, boost performance, and support smart, sustainable growth through every stage of your product’s journey. If you're wrapping things up after the launch, that’s fine, too. We’ll deliver full documentation and a clean handover so your in-house team or future partner has everything they need.

Surprise-free cross-platform development

Always on time

Predictable costs

Transparent workflow

Smart risk control

Reliable delivery

Cross-platform development should feel smooth and predictable β€” and that’s exactly how we run it. We manage scope carefully and track SPI (Schedule Performance Index) to keep everything moving on schedule. If something changes, you’ll know right away β€” with a clear view of how it affects timing and costs. That means no delays, no drama, just steady progress and a timeline you can count on.

keeping projects on track

What sets us apart?

  • Eastern European engineers with 6+ years of development experience.
  • PMI standards and rigorous QA ensure top-tier software quality.
  • CPI & SPI tracking keeps projects on schedule and within scope.
  • Regular updates, reports, and full code access keep everything transparent.
  • Flexible, cost-effective model with no legal headaches or long-term ties.

30+

cross-plat. projects

4.7+

CPI & SPI variance

>85%

NPS score

<10%

CPI & SPI variance

99.89%

acceptance rate

Free consultation

A single codebase, a seamless experience for all your usersβ€”backed by 99.89% project acceptance and >85% NPS score. Let's talk.

  • Response within 24 business hours
  • Reliable estimate within 10 business days
  • React Native experts involved
Serhii

Head of Client Relations

Eugene

Account Executive

Sorting out your concerns

What makes cross-platform development a good choice?

With cross-platform development, you build once and launch on both iOS and Android β€” no need for separate codebases or duplicated effort. It’s faster to develop, easier to maintain, and more cost-effective.

If you’re aiming to reach more users without doubling your budget or timeline, cross-platform is a smart, efficient move.

What tech stack do you use for cross-platform development?

We mainly use React Native to build high-performing apps, ensuring a smooth experience on both iOS and Android. On the backend, our cross-platform mobile app development company works with Node.js, Laravel, and Ruby, creating secure, scalable APIs to support your app.

Can you meet our quality standards?

Quality drives everything we do. Our engineers bring deep expertise and a commitment level clients often say exceeds their in-house teams.

We tailor development to your specific goals and standards, keeping you involved through real-time access to kanban boards, wireframes, and code repositories.

Our experience isn't limited to app developmentβ€”we also help teams implement tailored QA processes to match their exact standards. So if you’re after reliability and top-tier standards, our cross-platform application development company has you covered.

How do you keep us in control throughout development?

We know staying in control matters, so we keep it simple.

From the start, we set up a clear communication plan and provide weekly reports comparing estimates to actuals. You only pay for approved work, with full transparency on costs.

We keep a close eye on scope, and if anything changes, you’ll know right away. Any impact on timeline or cost is flagged upfront, so you’re always informed.

How will we retain expertise over the parts we outsource?

We keep you plugged into every step, so your team ends up with full ownership. We document everythingβ€”architecture, implementation, the worksβ€”and if needed, we’ll hand over a final product guide.

You also get real-time access to our kanban boards, docs, wireframes, and code, so nothing slips through the cracks. With regular demos and an Agile workflow, our cross-platform application development services transfer knowledge smoothly, ensuring you’re ready to take over whenever you want.

How can we be sure you’ll deliver exactly what we agreed on?

We begin by thoroughly documenting wireframes, designs, and features. Demos and prototypes keep you involved, ensuring the product takes shape the way you expect.

Agile development keeps things flexible so we can adapt to new insights without losing focus. After launch, we stay engaged, collecting user feedback to guide improvements. Early testing helps fine-tune features, and structured feedback loops keep your product evolving to match real-world needs.

Will the team be consistent so they understand our product?

We know consistency matters. Our developers stay an average of 3.8 yearsβ€”well above the 2.5-year industry normβ€”thanks to competitive salaries and a supportive culture. As a result, our churn rate in 2023 is only 5.5%, so you’ll have the same familiar faces on your project.

If anyone does move on, we handle it seamlessly. New team members get a thorough handoff, ensuring your product stays on track without hiccups. That’s how our cross-platform app development company keeps your code in experienced hands.

How will we fully understand the outsourced code in-house?

We keep everything visible so your team sees exactly how your product is built. Architecture docs, commit logs, code reviewsβ€”you’ll have it all at your fingertips. Need more details? We’ve got you.

If you decide to bring development in-house or switch providers, we’ll ensure a thorough handoff. You get a codebase you can maintain and evolve with total confidence.

Will language barriers affect communication?

No. Since 98% of our clients are in the US or UK, we speak English dailyβ€”both for technical breakdowns and regular chats. Our entire team is fluent, so every update, discussion, and collaboration runs smoothly.Β 

From project updates to everyday chats, we are the best cross-platform app development company for smooth communication. You’ll always feel heard, understood, and completely in sync with our progress.

Will we retain full IP ownership of the product?

Absolutely. Our contract spells it out plainly: everything we create for you is yours, no exceptions. We’re big on clear communication and want you to feel completely at ease about your ownership rights.

How do you stay stable given the situation in Ukraine?

Worried about disruptions? We have taken strong measures to ensure stability and uninterrupted delivery of cross-platform app development services.

Our decentralized setup, including teams outside Ukraine, ensures projects stay on track even when local challenges arise. We also have backup power in place, so blackouts don’t slow us down.

Since the conflict began, we’ve hit every milestone, scaled teams as needed, and continued bringing on new long-term clients. In short, your cross-platform development stays stable, even under pressure.

How do you keep estimates accurate and budget on track?

Our estimates are built on experience, not guesswork.y following PMI standards, our estimates typically fall within 10% of the original budget, giving you a timeline and costs you can actually trust.

We also plan for the unexpected. Proactive risk management helps us spot potential issues early, so they don’t derail your project. If changes arise, you’ll know right awayβ€”no hidden costs or last-minute surprises.

When new ideas come up, we use a structured change management process. We’ll discuss priorities with you, align expectations, and keep the scope in check. You end up with predictable progress, clear communication, and a budget that stays on target from start to finish.

Will my app perform as well as native apps?

Usually, yes. Cross-platform apps deliver near-native performance, making them ideal for most projects. Unless your app relies heavily on very specific platform features, users won’t notice a difference.

Our cross-platform mobile application development company carefully optimizes every app, ensuring it runs smoothly across all devices.

Do I need to update the app for each platform separately?

Nope β€” one codebase means simpler updates for both iOS and Android. While occasional platform-specific tweaks might be needed, most updates apply automatically to both platforms.

App Store and Google Play each have their own publishing processes, but we handle all that for youβ€”release notes, uploads, asset management, and guiding updates through reviewβ€”so you skip the hassle and stay focused.

How will my app handle future OS updates on iOS and Android?

Cross-platform frameworks naturally adapt to OS updates, so your app stays compatible with minimal hassle. We proactively track iOS and Android changes, providing regular updates to keep things running smoothlyβ€”no juggling separate native apps or dealing with update headaches.

Rough cross-platform development costs

Discovery and prototype

$15,000 to $50,000

Validate your idea with a small-scale, cross-platform prototype

Features

  • Clear, cross-platform project scope
  • UI/UX prototype
  • Proof of concept (PoC)
  • Optimized feature listΒ 
  • Time and cost estimates

Minimum viable product

$50,000 to $100,000

Start with a lean, functional app

Features

  • Framework-optimized design
  • Core features for iOS & Android
  • Third-party integrations
  • Multi-platform basic securityΒ 
  • Performance tuning

Sales-ready product

$100,000 to $500,000

A full-featured application built for scalability and revenue generation

Features

  • Custom UI/UX for both platforms
  • Platform-specific functionality
  • Third-party integrations
  • Cross-platform API integrations
  • Advanced security measures

Market-leading application

$500,000+

A best-in-class cross-platform product designed to outperform competitors

Features

  • Brand-focused UI/UX design
  • Advanced features for iOS & Android
  • Multi-module architectureΒ 
  • Optimized performance for all platforms
  • Ongoing app maintenance and updates

List of Key Cost Factors:

  1. Complexity of cross-platform features
  2. Adaptive design across platforms
  3. Integration with third-party services
  4. Platform-specific security measures
  5. Device compatibility & performance
  6. Development team expertise

Key people

person.name
Andrii
Founder & CEO
Clockwiser from Day 1 | Led Clockwise to Top Ukrainian IT Company
person.name
🎀 Karaoke champion
🧠 Quiz monster
🐈 Cat team
person.name
Bogdan
Head of Delivery
10 y. of experience | Set up delivery with 99.88% acceptance rate
person.name
πŸ‚ Snowboarder
πŸ’Ώ DJ
πŸ₯ Drummer
β˜• Coffeeholic
person.name
Serhii
Head of Client Relations
11 y. of experience | 98% client satisfaction rate
person.name
🚞 Traveller
Gym rat
β˜• Coffeeholic
person.name
Natalia
Head of People
10 y. of experience | 100+ hired talents
person.name
Hyggeist
Wanderlust Soul
πŸŠβ€β™€οΈ Swimmer
πŸ•―οΈ Detail Aesthete
person.name
Mike
Solution Architect
15 y. of experience | 50+ projects with 99,99% uptime reliability
person.name
πŸ§‘β€πŸΌFather of 3
person.name
Pavlo
Tech Lead
15 y. of experience | Managed 40+ developers as Tech Lead
person.name
πŸ’¨ Motorhead
🧰 Tinkerer
person.name
Dmytro
Tech Lead
15 y. of experience | 10+ AWS projects led
person.name
🏎️ F1 Fan
🍻 Beer connoisseur
β˜• Coffee aficionado
person.name
Yana
Design Lead
12 y. of experience | 100% UI/UX acceptance rate after user tests
person.name
πŸ‘©β€πŸŽ¨ Local artist
πŸ§˜β€β™€οΈ Yoga practitioner
🦻Hearing Accessibility Advocate
πŸ“š Bibliophile
person.name
Bogdan
QA Lead
17 y. of experience | QA Lead on 10+ multi-domain projects
person.name
πŸŽ“ Nerd
⛷️ Ski fan
Strong Spirits expert
person.name
Andrii
Project Manager
8 y. of experience | 30+ projects delivered
person.name
🏎️ Junior Car Drifter
🧳 Traveller
β˜• Coffee enthusiast
person.name
Tetiana
Business Analyst
5 y. of experience | Saves $30K on avg./client with discovery
person.name
🧠 Braving the unknown
πŸ’¬ Empathy-driven communicator
πŸ–οΈ Passionate traveler
person.name
Andrii
Founder & CEO
Clockwiser from Day 1 | Led Clockwise to Top Ukrainian IT Company
person.name
🎀 Karaoke champion
🧠 Quiz monster
🐈 Cat team
person.name
Bogdan
Head of Delivery
10 y. of experience | Set up delivery with 99.88% acceptance rate
person.name
πŸ‚ Snowboarder
πŸ’Ώ DJ
πŸ₯ Drummer
β˜• Coffeeholic
person.name
Serhii
Head of Client Relations
11 y. of experience | 98% client satisfaction rate
person.name
🚞 Traveller
Gym rat
β˜• Coffeeholic
person.name
Natalia
Head of People
10 y. of experience | 100+ hired talents
person.name
Hyggeist
Wanderlust Soul
πŸŠβ€β™€οΈ Swimmer
πŸ•―οΈ Detail Aesthete
person.name
Mike
Solution Architect
15 y. of experience | 50+ projects with 99,99% uptime reliability
person.name
πŸ§‘β€πŸΌFather of 3
person.name
Tetiana
Business Analyst
5 y. of experience | Saves $30K on avg./client with discovery
person.name
🧠 Braving the unknown
πŸ’¬ Empathy-driven communicator
πŸ–οΈ Passionate traveler
person.name
Andrii
Project Manager
8 y. of experience | 30+ projects delivered
person.name
🏎️ Junior Car Drifter
🧳 Traveller
β˜• Coffee enthusiast
person.name
Bogdan
QA Lead
17 y. of experience | QA Lead on 10+ multi-domain projects
person.name
πŸŽ“ Nerd
⛷️ Ski fan
Strong Spirits expert
person.name
Yana
Design Lead
12 y. of experience | 100% UI/UX acceptance rate after user tests
person.name
πŸ‘©β€πŸŽ¨ Local artist
πŸ§˜β€β™€οΈ Yoga practitioner
🦻Hearing Accessibility Advocate
πŸ“š Bibliophile
person.name
Dmytro
Tech Lead
15 y. of experience | 10+ AWS projects led
person.name
🏎️ F1 Fan
🍻 Beer connoisseur
β˜• Coffee aficionado
person.name
Pavlo
Tech Lead
15 y. of experience | Managed 40+ developers as Tech Lead
person.name
πŸ’¨ Motorhead
🧰 Tinkerer
person.name
Mike
Solution Architect
15 y. of experience | 50+ projects with 99,99% uptime reliability
person.name
πŸ§‘β€πŸΌFather of 3
person.name
Natalia
Head of People
10 y. of experience | 100+ hired talents
person.name
Hyggeist
Wanderlust Soul
πŸŠβ€β™€οΈ Swimmer
πŸ•―οΈ Detail Aesthete
person.name
Serhii
Head of Client Relations
11 y. of experience | 98% client satisfaction rate
person.name
🚞 Traveller
Gym rat
β˜• Coffeeholic
person.name
Bogdan
Head of Delivery
10 y. of experience | Set up delivery with 99.88% acceptance rate
person.name
πŸ‚ Snowboarder
πŸ’Ώ DJ
πŸ₯ Drummer
β˜• Coffeeholic
person.name
Andrii
Founder & CEO
Clockwiser from Day 1 | Led Clockwise to Top Ukrainian IT Company
person.name
🎀 Karaoke champion
🧠 Quiz monster
🐈 Cat team
person.name
Tetiana
Business Analyst
5 y. of experience | Saves $30K on avg./client with discovery
person.name
🧠 Braving the unknown
πŸ’¬ Empathy-driven communicator
πŸ–οΈ Passionate traveler
person.name
Andrii
Project Manager
8 y. of experience | 30+ projects delivered
person.name
🏎️ Junior Car Drifter
🧳 Traveller
β˜• Coffee enthusiast
person.name
Bogdan
QA Lead
17 y. of experience | QA Lead on 10+ multi-domain projects
person.name
πŸŽ“ Nerd
⛷️ Ski fan
Strong Spirits expert
person.name
Yana
Design Lead
12 y. of experience | 100% UI/UX acceptance rate after user tests
person.name
πŸ‘©β€πŸŽ¨ Local artist
πŸ§˜β€β™€οΈ Yoga practitioner
🦻Hearing Accessibility Advocate
πŸ“š Bibliophile
person.name
Dmytro
Tech Lead
15 y. of experience | 10+ AWS projects led
person.name
🏎️ F1 Fan
🍻 Beer connoisseur
β˜• Coffee aficionado

Awards

Show more
Top Software Development Company, 2025
Top Software Development Company, 2025
Top IT Services Company, 2025
Top IT Services Company, 2025
Listed Among Top 1000 Companies Globally
Listed Among Top 1000 Companies Globally
Top NodeJS Developers, 2025
Top NodeJS Developers, 2025
Top Managed Service Provider in 2025
Top Managed Service Provider in 2025
01 | 25

Cross-platform expertise, without trial and error

With 30+ projects delivered and an average app rating of 4.7+, we build software that performs across every device. Let’s talk.
By submitting this form, you agree to Clockwise Software Privacy Policy.