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Mobile app developers · Surry Hills, Sydney

Mobile apps that handle the real thing, from blood test results to pool chemistry

An app earns its place on someone’s phone by doing one job brilliantly. Tonic is a full service independent agency in Sydney specialising in mobile app development for iOS, Android and cross-platform, including Sonic Healthcare’s apps that deliver blood test results to doctors and patients. Our in-house designers and developers handle strategy, UX, build, integrations, launch and support.

  • iOS and Android apps for Sonic Healthcare, Baracuda and Rhino-Rack
  • Native or cross-platform, chosen for your performance, budget and roadmap
  • Designed, built, launched and supported by one in-house Sydney team
Book an app scoping callSee app work

Prefer to talk? Call 1300 974 864

Brands we’ve built apps for

  • Sonic Healthcare
  • Baracuda
  • Rhino-Rack

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Apps we’ve designed and built

Mobile app development services, from discovery to app store

  • Mobile product strategy and discovery

    Product goals, user needs and technical direction defined before a line of code is written.

  • UX and UI design for mobile

    Intuitive, accessible mobile interfaces, designed and tested with real users.

  • iOS app development

    Native iOS apps built to Apple’s platform guidelines for speed and reliability.

  • Android app development

    Native Android apps built to Google’s platform guidelines across a wide range of devices.

  • Cross-platform development

    One shared codebase for iOS and Android where it suits your performance needs and budget.

  • API and backend integration

    Apps connected to your backend services, CMS and business systems, so data flows where it needs to.

  • Testing and QA

    Device, OS version and performance testing across real-world scenarios.

  • App Store and Google Play launch

    Submission, compliance and release management for both app stores.

  • Support and optimisation

    Ongoing updates, monitoring, OS upgrades and new features as your product grows.

Industries we do this for:Healthcare →Consumer electronics →

Related services:UI and UX design →Custom software development →Web development →

Research

What the research says about how people use apps

People live in apps, but only a handful get used every day. Strategy and UX decide whether yours is one of them.

Why organisations choose Tonic as their app developers

  • Product-focused thinking

    We design around how people actually use the app, not just a feature list.

  • Native or cross-platform, honestly

    We recommend the approach that suits your performance needs, budget and long-term goals.

  • Design and engineering together

    Our designers and developers work as one in-house team, so nothing is lost between the design and the build.

  • Built to integrate and grow

    Scalable architecture and integrations mean the app evolves with your product roadmap.

How our app development process works

  1. Discover

    We define user needs, business goals and the technical approach.

  2. Design

    We plan the architecture and design intuitive mobile experiences, tested with users.

  3. Build

    We develop, integrate and test across devices and OS versions.

  4. Launch

    We manage App Store and Google Play submission and rollout.

  5. Support and grow

    We monitor, update and add features based on data and user feedback.

A Tonic team member working on a laptop in the studio lounge

Looking to build a mobile app your users actually want to use?

Talk to the team

Mobile app development FAQs

Should we build native or cross-platform?

It depends on performance needs, budget and long-term goals. Native suits apps that need the best performance and device features; cross-platform shares one codebase across iOS and Android. We’ll recommend the right approach.

How long does it take to build a mobile app?

Timelines vary with complexity. Most apps take a few months, and larger products take longer. We set a timeline after discovery and can release in phases.

How much does app development cost in Australia?

Cost depends on the features, whether you need iOS, Android or both, the design complexity, and integrations with systems such as payments, booking or your CRM. A focused first release costs far less than a full-featured app. You get a fixed scope after discovery, with real-time scope reporting during the build.

Can you improve an existing app?

Yes. We audit the app’s performance, usability and stability, then optimise or rebuild where needed. You get a prioritised plan, from quick fixes such as crashes and slow screens to bigger improvements based on user feedback and analytics.

Can you take over an app another developer built?

Yes. We review the code, infrastructure and app store accounts, document what we find, then take over support and development. You get a clear picture of the app’s condition and any risks before we make changes.

Do you handle backend and integrations?

Yes. Mobile apps are usually part of a broader system, and we build the APIs and integrations that connect them.

Can you manage App Store and Google Play submission?

Yes. We handle App Store and Google Play submission, compliance with each store’s guidelines, and release management for updates. That includes store listings and responding to review feedback, so releases go live without delays.

Do you build healthcare and other regulated apps?

Yes. We built Sonic Healthcare’s apps that deliver blood test results to doctors and patients, with security and compliance built into delivery.

What happens after launch?

We provide ongoing support under SLAs, including OS updates, monitoring, bug fixes and new feature development. Apple and Google update their operating systems every year, so ongoing support keeps your app working, secure and compatible.

Tell us about your app

Tell us who the app is for, what it needs to do and where you are today.