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Start developing your web app today

We develop responsive, user oriented, cross device compatible web apps that can be seamlessly scaled to millions of live users in a matter of weeks.

100
+

Completed Projects

3+

Years of Experiences

30+

Development Experts

4.9

Clutch rating

Development

You have an idea.
Can we build it?

Short answer: yes.

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SaaS platforms

We build SaaS platforms designed for growth: subscription models, user management, secure payments, scalable infrastructure, and everything you need to succeed in the market.

Stacked translucent orange rectangles with a small white square containing an orange wrench and screwdriver crossed icon on a white background.
User interface of Calda Containers platform showing a Devices list with types, device IDs, and asset IDs in a table.
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Internal company platforms and workflow tools

Custom tools that streamline operations with features like dashboards, reporting, and team collaboration.

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Marketplaces and commerce platforms

Web platforms that enable transactions between buyers and sellers, support subscription models, or manage service bookings.

User interface showing a bill approval form with fields for job, amount, cost codes, and description, alongside comments from Sofia Novak and Daniel Brooks requesting approval and delivery confirmation.
Mobile app interface showing latest messages and desktop view with contacts list including names, emails, and phone numbers.
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Any mobile app idea in web form

From social networks to lifestyle apps, everything you imagine on mobile can also be built as a responsive web app.

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Something different

If your idea does not fit into these groups, we would love to hear about it. Book a call and let us explore how we can bring it to life.

User interface screen showing card management section with bank names, accounts, card holders, and payment accounts on a soft peach gradient background.
Pixel art orange octopus holding a black briefcase.

What we can do for you

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UX Design

Our in-house UX experts engineer flows and screens optimized for long in-app usage, high retention, and low churn rates. They design apps that are intuitive to navigate and empower users instead of confusing them.

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UI Design

Our UI design team creates a unique identity for your app. One that stands out, builds brand recognition, and makes users feel at home while resonating with their values and personality.

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Backend Development

Alongside our excellent frontend team we have Supabase-certified backend specialists who ensure your product is secure, reliable, and able to support millions of users.

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Payments

Our team is Stripe and RevenueCat certified, ensuring your app supports secure payments. We enable smooth one-time charges and subscriptions with full visibility into in-app purchases and customer payment profiles.

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Project Management

We manage the project so you don’t have to. Our experienced project managers act as your single point of contact, keeping everything on track from start to finish. You receive weekly progress updates and can reach us anytime through Slack for quick answers to your questions.

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Quality Assurance

Before launch our quality assurance specialists run extensive tests to ensure every button, feature, and flow works properly. This guarantees that once your product goes live, users experience it exactly as you envisioned.

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Publication and Post-Launch Support

Once QA is complete we also publish the app for you. After launch we provide ongoing support so you never feel alone. Whether it is post-launch maintenance, new features, or a simple technical question, you can always count on us. Once a Calda client, always a Calda client.

Why work with us?

Through 100+ successfully completed projects, we’ve developed a client-centered system that makes your experience seamless from start to finish.

Everything is done in-house
We are committed to executing every step of project development in our office with no outsourcing whatsoever. From initial design drafts to QA tests and launches, everything happens under one roof. This ensures smooth handoffs, efficient communication, and coherent products that users love.
Award-winning UX/UI design team
Design is the foundation of a successful software product. It shapes both branding and user experience. Our award-winning “App Design of the Year” design team ensures that every product we deliver not only excels visually but is also optimized for user retention.
Silver circular badge with the text 'Design of the Year' surrounding a geometric logo in the center.
Certified Experts
Through years of working with a wide range of technologies, we’ve earned multiple certifications. These certifications recognize us as top implementation partners and grant us first-tier access to the technologies’ own specialists whenever needed.
Collection of five circular icons with stylized letters and symbols in blue, red, and green colors.
Experience matters
Experience is crucial, especially with products as complex as software. After 3+ years of serving clients and successfully delivering more than 100 projects from start to finish, we’ve developed the know-how to execute flawlessly.
Four cards each with an emoji and text representing roles: Backend development, UX/UI design, Frontend development, and QA testing.
Custom Development
We are known for our low-code approach, which enables fast and cost-effective development. In addition to that, we also provide fully custom development. When the nature of a project or specific client requirements call for it, we can deliver products from start to finish using custom code.
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We always go the extra mile
Going the extra mile is one of our core company values, and every team member lives by it. In practice, this means we are driven to pursue excellence in everything we do and to exercise our talents to the fullest every day. We work to be proud of what we create.
Calda octopus holding trophy
FOR US IT’S ALL ABOUT GOING AN EXTRA MILE

All about your success since day one

Real Results. Real Feedback.
19 Reviews
4.9 out of 5 rating on clutch with 5 orange stars
DON'T DELETE Service
19 Reviews
4.9 out of 5 rating on clutch with 5 orange stars
“What impressed me most about Calda was their exceptional commitment to customer satisfaction and innovation. Their ability to anticipate market trends and adapt quickly set them apart.”
Dori Dagher
ATOMES BIO | Quebec, Canada
19 Reviews
4.9 out of 5 rating on clutch with 5 orange stars
“The thing that I appreciated the most was how they mapped the whole process for me and made sure I was aware of time frames and pricing. Everyone has been on the same page since day 1.”
Phillip Shepard
REALTOR | Arkansas, USA
19 Reviews
4.9 out of 5 rating on clutch with 5 orange stars
“If you’re building an app, work with Calda. As a first-time app founder, I felt supported the whole way.”
Development Agency
SUBWAY CEE REGION | Central Europe
19 Reviews
4.9 out of 5 rating on clutch with 5 orange stars
“What stands out the most is how they think like builders. Calda doesn't wait for perfect specs; they get stuck in, figure things out, and keep moving.”
Jose Supico
STEALTH | London, UK
19 Reviews
4.9 out of 5 rating on clutch with 5 orange stars
“Working with Calda has been a fantastic experience. Their tech know-how is top-notch, communication is clear, and they really go the extra mile. They show real passion and make it feel like we’re all in this together.”
Eric Druckenmiller
WILDSOUND | New York, USA
19 Reviews
4.9 out of 5 rating on clutch with 5 orange stars

Get started in days.
Launch in weeks.

No waiting lines. Start working before your next team meeting.

GET STARTED
01
Book a free consulting call
Speak with our experts, refine your idea, and get it fully ready for development.
02
Get your quote in 48 hours
Within two days we deliver a detailed, feature-by-feature quote so you know exactly what each part of your project will cost.
03
Start within 48 hours
Once the scope is agreed, we guarantee development begins within 48 hours.
04
Launch faster than expected
Our team works on your project as if it were our own, keeping you updated at every milestone so you can go live sooner.
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OUR WORK

Apps we developed

We build production-grade web apps for established businesses and fast-moving startups.

MobioT

Dutch-based hardware group is disrupting the market of GPS tracking with an innovative GPS tracke

How we developed a mobile app to protect one million vehicles across Europe with MobioT’s smart GPS trackers.

MobioT
Client Keeper

The go-to CRM app that helps busy realtors stay effortlessly connected with their clients

The go-to CRM app that helps busy realtors stay effortlessly connected with their clients.

Client Keeper
CRW

Designed and Developed a Social & Dating App to Create Real Connections

How we co-created an app that combats loneliness. CRW empowers users to create relationships with groups (CRWs), making it easier than ever to connect with others.

CRW
Subway

Recreating Subway’s Build-Your-Own-Sub Experience in a Mobile App

We partnered with Subway to design the mobile experience for iOS and Android, rethinking how people order their favorite #subs from the ground up.

Subway
FFDC

How We Partnered with FlutterFlow to Develop an Official FFDC Event App

How We Partnered with FlutterFlow to Develop an Official FFDC Event App.

FFDC
Wildsound

Award-Winning Design for a Meditation Mobile App

Immerse yourself in nature's unique soundscapes, connecting with rivers and rainforests from around the world.

Wildsound
BTV

How We Help Building the Next Supply Chain Unicorn

BTV combines powerful GPS technology with a seamless user experience—making it easy to track, manage, and recover valuable assets across thousands of devices, locations, and vehicle types.

BTV
Superdex

Creating the Ultimate Car-Spotting Mobile Experience

The ultimate app for car enthusiasts—capture and share rare classics, supercars, and tuned street beasts with a like-minded community.

Superdex
Calda Octopus with a blue verification tick
Backed by industry-leading certifications and awards

Certificates &
awards

Our commitment to excellence is backed by industry-leading certifications of expertise and awards.

CERTIFIED AGENCY

FlutterFlow

One of the top four certified experts in the world.

Stripe iconStripe verified badge
CERTIFIED AGENCY

Stripe

Recognized as Verified Services Partners.

CERTIFIED EXPERTS

Supabase

One of the four featured development experts

TOP APP DEV COMPANY

Clutch Global Fall 2024

Recognised as top app development company.

RevenueCat logo
CERTIFIED EXPERTS

RevenueCat

Recognised as top app development company.

APP DESIGN OF THE YEAR

Design Of The Year

Won App Design Of The Year Award at FFDC in 2024.

Flutterflow Design of the Year Badge

Stack we work with:

FlutterFlow, Flutter and Dart, React, Supabase, Firebase, WeWeb, JavaScript, Next.js and Python.

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Calda octopus

Frequently Asked Questions

Will my web app work across all devices and browsers?

Yes. We build responsive web apps that work smoothly on desktop, tablet, and mobile, and are compatible with all major browsers.

How long does it usually take to develop a web app?

Once we agree on the scope, we start within a week. A typical mid-sized web app is usually completed and launched in about 12 weeks, but naturally it depends on the scope.

What technology stack do you use for web apps?

This completely depends on your product requirements and needs, but we always strive to choose the stack that allows us to build secure and scalable solutions with great efficiency. However, the stack we usually choose to work with is FlutterFlow, Flutter and Dart, React, Supabase, Firebase, WeWeb, JavaScript, Next.js and Python.

Can I start with a small MVP and expand later?

Yes. Many clients begin with a simple MVP to validate their idea and then add more features once they gather real user feedback.

Do I need to provide the designs, or do you handle design as well?

You don’t need to provide the designs. We handle that as well. Our in-house UI/UX team takes care of the entire design process and we deliver your app from initial concept through to launch.

Can you integrate my web app with other systems or services?

Yes. We can integrate your web app with third-party APIs and existing tools such as CRMs, ERPs, payment providers, or company databases.

Where will my web app be hosted?

We usually manage hosting for you through trusted third-party cloud providers, so you do not have to worry about setup or maintenance. If you prefer, we can also give you full control, either by connecting the app to a hosting provider of your choice or by deploying it on your own company servers.

How well will my web app scale as my business grows?

We build every project with scalability in mind. Your app can support hundreds, thousands, or even millions of users as long as it is paired with the right hosting plan.

How do you ensure the quality and performance of the final app?

Every project goes through structured QA testing during development and again before launch. We make sure every feature works as intended, performance is optimized, and we provide free fixes if any issues arise after delivery.

Can you integrate Stripe payments into my web app?

Yes. We are Stripe-certified and can seamlessly integrate Stripe payments into your web app.

App development tools' icons
backed by industry leading certifications

Start today, launch in weeks, scale forever.

GET STARTED
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