10M+
Downloads
Our combined experience has resulted in a staggering 10 million+ downloads across web and mobile products.
Frame Sixty is a US-based custom web application development company.
We design and build web applications in React, Node.js and modern stacks — SaaS platforms, dashboards, marketplaces and the web apps behind our clients’ products. Our team has shipped 100+ apps with more than 10 million downloads, for startups through Fortune 500 brands.
Custom Web Application Development Services
Six things we are asked for most often. Every engagement mixes them differently — a SaaS platform needs the backend and the design system; a product launch might need the marketing site and a WebAR demo.
SaaS Platform Development
We build multi-tenant SaaS platforms from the schema up: authentication and role-based access, subscription billing, admin tooling and the usage analytics founders need before their first renewal. Architecture decisions are made for the product's second year rather than its demo, so onboarding the hundredth customer costs no more engineering than the tenth.
React Development
React is our default front end. We build component libraries that stay consistent as teams grow, with TypeScript throughout, server-side rendering where search visibility matters, and state management chosen to fit the application instead of the trend. Existing React codebases are welcome — we take them over, audit them and modernise them as often as we start fresh.
API & Backend Development
Behind most web applications is the part users never see. We build APIs in Node.js with NestJS or Express, model data in PostgreSQL, MongoDB or MySQL, and use Redis for caching and queues. Integrations with payment, CRM and internal systems are treated as first-class work, with documented endpoints your own team can build against.
Web App UX/UI Design
Web application design is information architecture before it is interface. We map the workflows people repeat daily, then design around them — dense data views, forms that forgive mistakes, and states for empty, loading and error that are drawn rather than improvised. Brand identity is applied within that structure, not layered on top of it.
WordPress & Webflow Websites
Not every project needs an application. When you need a marketing site your own team can edit, we build on WordPress or Webflow — custom themes and components rather than page-builder sprawl, tuned for Core Web Vitals and search. We also build on Shopify where commerce is the point, and connect any of them to the web application running behind the scenes.
WebAR & 3D Web Experiences
Browsers do far more than documents now. We build WebAR experiences that run from a link with no app download, and 3D product views in WebGL and Three.js using 3D models built for real-time performance. It is a differentiator for commerce, training and product marketing that few web shops can deliver. Where an experience outgrows the browser, our AR and VR team takes it native.
Key stats
A decade of shipped product work behind every web application: platforms in production worldwide, millions of users reached, and patented engineering in augmented reality and machine learning.
100+
Apps developed
We have successfully developed over 100 web and mobile applications, deployed worldwide and supporting several languages.
10+
Years building products
We have been designing and building software for over a decade, for startups through Fortune 500 brands.
7
Patents owned
We hold seven published technology patents in augmented reality and machine learning.
How We Build Web Applications
Design starts with the workflows people repeat every day, not with a moodboard. We map the information architecture first, then draw the screens around it — dense data views, forms that forgive mistakes, and empty, loading and error states designed rather than improvised. Your brand identity is applied inside that structure: colour, type and tone carried through a component library the build inherits, so the hundredth screen still looks like the first.
Engineering runs in short cycles against a working environment you can open at any point. We choose the stack for the product’s second year rather than its demo, write automated tests around the paths that would cost you money if they broke, and review every change before it merges. Performance, accessibility and security checks are part of the definition of done — not a phase that gets cut when the date moves.
Launch is a step, not the finish line. We handle deployment and CI, set up monitoring and error reporting so problems surface before your users report them, and hand over documentation any future developer can pick up. Most clients keep us on afterwards for hosting, dependency and security updates and the next round of features, scoped monthly or per release.
Hire Web App Developers
Some teams need capacity rather than a full project. You can hire our web app developers as an embedded squad inside your process — your standups, your board, your repository — or as a self-contained team with our own project management and QA. Engagements run monthly with a notice period instead of a locked fixed term, and every line we write is yours from the first commit. Most start with one or two engineers and scale from there. We have partnered with startups and Fortune 500 brands, and we know how to scale a web platform to millions of users.
Our Web Development Stack
We work across the modern web stack — React and TypeScript on the front end, Node.js with NestJS or Express behind it, and PostgreSQL, MongoDB, MySQL or Redis for data and caching. Where a site rather than an application is the right answer we build on WordPress, Webflow or Shopify. The stack is chosen for your product, not for our convenience.
What a Custom Web Application Costs
The cost of a custom web application depends on scope: an internal dashboard with a single user role is a different budget from a multi-tenant SaaS platform with billing, integrations and an admin console. Project work is quoted as a fixed bid after a discovery call, so the full cost is clear before development begins.
If the requirements still need shaping, we start with a paid discovery phase whose deliverable is the scope, architecture and estimate — and that document is yours whether or not you build with us. A 30-minute call is usually enough to produce an accurate range.
Reviews from our clients
Client happiness has been our top priority for over a decade. We listen intently to clients and their customers, assume nothing, and fearlessly create innovative solutions. Relentless dedication ensures the perfect outcome.
Gabe CostaLogitechFrame Sixty was a great partner in supporting our Apple Vision Pro initiative. Their mixed reality team brought strong technical expertise and a clear understanding of the Apple ecosystem. They were friendly, committed, and easy to work with throughout the process. Most importantly, they delivered on time and met our expectations, making the collaboration smooth and efficient from start to finish.
Stephen RuizSMR ConsultingThey handled everything incredibly well.
Frame Sixty, LLC helped the client engage influencers and brick-and-mortar retailers. They ensured agile project management and completed the beta version on time and within budget, exceeding the client’s expectations. Frame Sixty, LLC’s flexibility and resourcefulness were hallmarks of their work.
Nick AlfieriBlitz Media, LLCThey work with an incredible urgency, getting tasks done with a great turnaround and creative problem-solving that saves us time and money.
Frame Sixty, LLC has successfully improved the app with luxury features and enhanced its speed and overall UI/UX. The team ensures a transparent workflow by working efficiently and providing valuable insights and guidance. Their keen understanding of the client’s vision and goals stands out.
Justin HosekHosek EnterprisesFrame Sixty far exceeded my expectations on design. They also went above and beyond to add some features that were not in our original scope but were discovered as needed during the build.
They always delivered on time or early. They were available night and day for any needs I might have had.
All of the staff are intelligent with great attitudes, which makes the entire process quick, easy and enjoyable.
Dave M.The Image ResolutionFrame Sixty was instrumental in transforming my vision of an XR 3D movie streaming app into reality, guiding me through every stage of the process. With deep expertise in AR/VR development, they supported everything from initial ideation to design and Unity development, ultimately achieving a successful launch on the Meta Oculus Store. The synergy of their spatial design skills and the technical depth of their senior Unity engineers made for a collaboration that was both professional and personable. Their commitment and industry knowledge were key in bringing my project to life.
Walter MarquezWalter Marquez MiamiFrame Sixty was instrumental in swiftly developing my responsive WordPress website. Their meticulous approach to detail and support in account creation and configuration ensured a seamless website launch.
This exceptional team, led by experienced senior developers and project managers, not only displayed technical proficiency but also guided me through content creation for each page. Regular communication facilitated timely delivery of the website. I’m excited to collaborate with Frame Sixty in the future.
JustiniRobotIn the 20 years that I have been developing technical products, this was the very first time that a developer successfully deployed code to an IoT device that worked the very first time without any bugs or prior testing.
Custom Web Application Development FAQs
Common questions about building a web application with Frame Sixty — what it costs, how long it takes, how a web app differs from a website, and what happens to hosting, security and support after launch.
The cost of a custom web application depends on scope: an internal dashboard with one user role is a different budget from a multi-tenant SaaS platform with billing and integrations. Project work is quoted as a fixed bid after a discovery call, so the full cost is clear before development begins. A 30-minute call produces an accurate range for your idea.
A focused web application typically takes three to five months from kickoff to launch; a platform with multiple user roles, billing and third-party integrations runs six months or more. Design and engineering overlap rather than running end to end, and you get a working environment to click through from the first few weeks.
A website presents information; a web application does work. If people log in, enter data, and the software changes state on their behalf — dashboards, portals, SaaS products, internal tools — that is a web application, and it needs a database, an API and real authentication. Marketing sites we build on WordPress or Webflow; applications we build in React and Node.js.
React has the deepest talent pool and the most mature ecosystem, which matters more than benchmarks: you can hire for it, and the libraries you need already exist and are maintained. We pair it with TypeScript for safety at scale and add server-side rendering where search visibility or first-load speed matters.
Yes, and it is a common request. We start with a code and architecture review, then give you an honest read: what is salvageable, what needs rewriting, and what each path costs. We take over React, Vue, Angular and server-rendered codebases, and we can stabilise a live product first and modernise it after.
Yes. We deploy to AWS, Vercel or your own cloud, set up CI, monitoring and error reporting, and keep dependencies and security patches current. Support is scoped monthly or per release. A web application with no maintenance plan degrades quietly — libraries age, certificates lapse and integrations change under you.
Security is part of the build rather than an audit at the end: parameterised queries, encrypted data at rest and in transit, role-based access enforced server-side, secrets kept out of the codebase and dependencies monitored for known vulnerabilities. Where you carry GDPR, HIPAA or SOC 2 obligations, we design the data model and logging around them from the start.
You do — the custom web application and its full source code are yours once development is complete, and Frame Sixty signs NDAs before you share anything sensitive. The codebase ships as part of the final deliverable with documentation any future development team can pick up, so you are never locked into working with us.
We have shipped 100+ apps with more than 10 million downloads for startups through Fortune 500 brands, and hold seven published technology patents. Web, mobile and AR sit in one team, so a web application that later needs a companion mobile app does not need a second agency. You work directly with the engineers building your product.
Get in touch
We’re interested to see how we can help. Send us a message and we will get back to you within 24 hours.