happydigital

Services / Web & mobile app development

Web & mobile app development

Apps people actually want to use.

Custom web app and mobile app development for customer-facing products and internal tools. Design, build, QA and release all happen inside the same team — so nothing is lost in a handoff between vendors, and the person who scoped it is the person who ships it.

Proof 47 products shipped since 2020, by a standing in-house team of 10+.

  • 2020founded · New York, working globally
  • 47products shipped
  • 10+in-house team, one team end to end
Scope of work

What we build — web apps and mobile apps

The product, the platform underneath it, and the unglamorous parts that decide whether it survives contact with real users.

Web app development

Real products with accounts, permissions, billing and admin — not a prototype wearing a product costume.

Mobile app development

iOS and Android, cross-platform by default and native where the hardware demands it. Shipped to both stores, review process included.

Progressive web apps

When an install is friction your users will not accept, a fast web app that behaves like a native one and updates without a store review.

APIs & back ends

The services your apps talk to, designed so a second client — a partner app, a mobile app, an AI assistant — can use them later without a rewrite.

Design, in the same team

Interfaces scoped, estimated and reviewed like engineering, because that is what they are. No design phase thrown over a wall.

Launch & handover

Testing, release, and documentation that survives a code review. You own the code and the accounts from day one.

Built onReact · Next.js · Node.js · PHP · Postgres · Firebase · iOS · Android

Honest fit

Web app, mobile app, or both?

When mobile earns its place

Your users are away from a desk, or you genuinely need the camera, GPS, offline use or push notifications. An app on a phone screen is a standing invitation to come back — which is worth real money if people use it weekly, and worth nothing if they use it twice a year.

When the web is enough

If your product is used at a desk, or the value is in the data rather than the device, a fast web app reaches everyone on day one with no store review and no install to argue for. We would rather ship you one thing that works than two you have to maintain.

In practice

An engagement like this

A services business runs its scheduling on a spreadsheet and three WhatsApp groups. We build one web app for the office and a phone app for the field team, sharing the same data: jobs assigned in the morning show up on the right phone, and updates come back without anyone re-typing them. The spreadsheet stops being the system of record, and nobody has to be told to stop using it.

“They took my idea and turned it into a fully functional, user-friendly app in a short amount of time. The end result exceeded my expectations.”

Client review · custom app development
How a project runs

Four steps, no theater

Same four steps whether it’s a website, a mobile app, or an integration. The scope changes; the process doesn’t.

  1. 01

    Listen

    NDA first, then plain-English discovery: your problem, your users, your numbers.

  2. 02

    Plan

    Research, a proposal you can repeat back to us, and an honest estimate.

  3. 03

    Build

    Agile cycles with working software you can click — not status decks.

  4. 04

    Ship

    Rigorous testing, launch, and a handover that survives a code review.

We’re a New York studio with a standing in-house team of 10+, working with clients globally. You’ll talk to the people who write the code.

Straight answers

Questions we hear a lot

Who owns the code?

You do. Code, designs and infrastructure accounts, all of it, with a handover that survives a code review. NDA first if you want one — it is step one of our process anyway.

How long does a build take?

A focused web app or mobile app typically reaches first users in 6-12 weeks depending on scope. You get a fixed scope and a date before we start, and working software you can click throughout — not status decks.

Do you build for web and mobile, or do we need two agencies?

One team does both. The people who design the product write the web app and the mobile apps, so the model, the API and the interface stay consistent instead of drifting apart between two vendors. That is why "one team, end to end" is a technical claim here, not a slogan.

Native or cross-platform for mobile?

Cross-platform unless something forces our hand — it ships faster and one codebase serves both stores. We go native when the product depends on hardware or platform features that cross-platform handles badly, or when performance targets demand it. We tell you which case you are in before you commit, and why.

What stack do you build on?

React and Next.js on the front, Node.js or PHP on the back, Postgres or Firebase underneath, deployed on modern cloud infrastructure. Deliberately boring and widely known, so you can hire for it and your next engineer is not learning an exotic bet.

Start here

What should it do on day one?

Tell us that much and we’ll come back with the scope, the price and the date — free, in plain English.

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