How to build an app
in Australia
A practical, step-by-step guide for non-technical founders. No jargon, no hand-waving. Real costs, real timelines, and the exact steps from idea to App Store.
A practical, step-by-step guide for non-technical founders. No jargon, no hand-waving. Real costs, real timelines, and the exact steps from idea to App Store.
Most guides about building apps are written for developers. This one is written for founders, which means I care more about whether your app makes money than whether your code is elegant.
I have been building apps for founders since 2018 and have worked with everyone from first-time solo founders with a napkin sketch to experienced operators raising Series A. The process is the same. The mistakes are the same too.
Here is the full picture, from the moment you have an idea to the day you hit publish on the App Store.
Most failed apps are not failed because of bad code. They fail because nobody wanted what was built. The best thing you can do before spending a dollar on development is talk to 20 real potential users.
Not your mum. Not your mates who are being nice. Actual strangers who have the problem you are trying to solve. Ask them to describe the problem in their own words. Ask how they currently deal with it. Ask what they would pay to have it solved. Listen far more than you talk.
If you cannot find 20 people who genuinely have this problem and want a solution, you are either talking to the wrong people or the problem is not painful enough to build a business around.
Validation does not have to be expensive. A landing page with a waitlist, a manual concierge MVP (you doing the job by hand), or even a Figma prototype you show to users can tell you everything you need to know before committing to a build.
The founder mistake I see most: Building first, validating second. It is expensive, slow, and usually ends with a product looking for a problem. Do the conversations first. It takes weeks, not months, and saves you six figures.
An MVP is not a cheap version of your full product. It is the smallest version that lets you test whether your core assumption is true. What is the one thing that, if it works, proves the business can work?
Write down every feature you want. Then draw a line. Above the line: things that are required to test your core hypothesis. Below the line: everything else, which goes into v2.
A fitness app MVP does not need leaderboards, social sharing, nutrition tracking, live classes, and a coach marketplace. It needs one workout flow that people complete and come back to. That is the hypothesis. Test that first.
A good way to do this: write a one-page Product Brief before you talk to any developer. It forces you to articulate who the users are, what the core workflow is, and what success looks like. See the app development brief template for exactly how to structure this.
Not all apps are the same, and the category of app you are building affects cost, timeline, and technology choices significantly.
| App type | Examples | Typical MVP cost | Typical timeline |
|---|---|---|---|
| Consumer mobile app | Fitness, lifestyle, dating, health | $50K–$120K | 14–20 weeks |
| Two-sided marketplace | Booking, services, rentals | $80K–$180K | 18–28 weeks |
| SaaS web app | B2B tools, dashboards, platforms | $80K–$200K | 16–24 weeks |
| On-demand service | Delivery, trades, transport | $80K–$150K | 16–22 weeks |
| Healthcare/compliance app | Medical, NDIS, mental health | $120K–$300K | 24–40 weeks |
For most consumer-facing apps in Australia, iOS-first is the right strategy. iPhone users in Australia skew toward higher-income demographics and have higher app spend. If your audience is mixed or you cannot afford to miss Android users, a cross-platform build using Flutter covers both platforms with one codebase.
The brief is your single most important document. It tells any developer exactly who the users are, what they do in the app, what success looks like, and what is out of scope. Without it, every quote you get will be a guess and every conversation will go in circles.
When evaluating development partners, there are three broad options: an Australian agency, a freelancer, or an offshore team. Each has tradeoffs.
| Option | Cost | Risk level | Best for |
|---|---|---|---|
| Australian agency | $$$ | Low | Founders who need strategy and execution under one roof |
| Freelancer | $$ | Medium–High | Well-defined projects with an experienced technical founder managing |
| Offshore team | $ | High | Mature products with strong internal technical oversight |
For non-technical founders, an experienced agency is almost always the right call. You are not just paying for code. You are paying for the product thinking, the process, and the de-risking that comes from a team that has shipped dozens of products and knows where things go wrong.
Read the full pricing guide to understand what you should expect to pay for each option.
Before any code is written, a quality dev team runs an Inception (sometimes called Discovery) phase. This is a paid engagement of 4 to 6 weeks that produces the full design system, wireframes, user flows, and technical architecture for your product.
At Rebelled, Inception costs between $12,000 and $25,000 depending on complexity. What comes out of it is a complete set of production-ready screens in Figma, a scoped development plan with clear milestones, and enough detail for the dev team to estimate the build with high confidence.
Founders who skip Inception try to estimate a build from a vague description. That is how you get quotes that double mid-project.
The Inception phase also forces alignment. Before development starts, you and the team agree on exactly what is being built and what it looks like. Changes at this stage cost almost nothing. Changes during development cost three times as much.
Development runs in sprints, typically two weeks long. At the end of each sprint you see working software you can interact with, not just progress reports. This is important. It keeps the team accountable and gives you the chance to catch anything that does not feel right before it gets buried in later sprints.
At Rebelled, we build in Flutter. It gives us one codebase that runs natively on both iOS and Android, which means you are not paying for two separate apps. Flutter's rendering engine also gives it a performance and visual quality advantage over React Native for most consumer apps.
The development phase for a well-scoped MVP typically runs 8 to 14 weeks. During this time you will have regular check-ins, sprint reviews, and access to a staging build you can test on your own device.
What causes builds to go over time and budget? Scope changes mid-sprint, poorly defined requirements, integrations with third-party APIs that have undocumented behaviour, and App Store review delays. The first two are controllable with a good brief and an experienced team. The last two are just reality.
QA is not optional. It is the difference between a product that builds user trust and one that drives 1-star reviews in the first week. A proper QA phase tests every user flow, every edge case, and every device variant the app runs on.
Expect 2 to 4 weeks of dedicated QA at the end of the build. This includes functional testing, performance testing on real devices, and a round of user acceptance testing (UAT) where you work through the app yourself against a checklist.
Do not skip UAT. You know your users better than any developer. You will catch things that no automated test will ever find.
App Store submission is not instant. Apple's review process typically takes 1 to 3 business days for a first submission, but rejections add time. Common rejection reasons include missing privacy disclosures, broken functionality, or insufficient onboarding for reviewers to test the app. A good dev team prepares for this and structures the submission correctly the first time.
Google Play is faster, usually 24 to 48 hours. But do not make the mistake of ignoring your Google Play listing. ASO (App Store Optimisation) on both platforms matters for organic discoverability.
Your App Store listing needs a compelling title, keyword-rich description, high-quality screenshots, and a preview video. These are often left to the last minute and cost downloads. Invest a few hours here.
Launch is not the finish line. For most founders it is the starting gun. Your first real users will tell you more about your product in two weeks than months of planning ever could.
The post-launch phase matters more than most founders expect. You need to:
At this stage, ongoing development typically runs at a retainer or sprint rate. Expect $15,000 to $30,000 per sprint (2 weeks) for a mid-size feature drop, or a monthly retainer of $8,000 to $20,000 for continuous improvement work.
The honest truth about post-launch: The apps that win long-term are the ones whose founders are obsessed with retention. It is easy to get downloads. Getting people to come back is the hard part. Build your iteration roadmap around the data, not your gut.
Here is a realistic cost breakdown for a standard consumer mobile app MVP in Australia, built with a quality local agency:
| Phase | Typical cost | Duration |
|---|---|---|
| Validation (DIY) | $0–$500 | 2–4 weeks |
| Inception (design & scoping) | $12,000–$25,000 | 4–6 weeks |
| Development (MVP) | $40,000–$120,000 | 8–14 weeks |
| QA & testing | Included above | 2–4 weeks |
| Launch prep & submission | Included above | 1–2 weeks |
| Total MVP (simple) | $50,000–$80,000 | 4–6 months |
| Total MVP (mid-complexity) | $80,000–$150,000 | 5–9 months |
For a deeper dive on costs, see the full app development cost guide for Australia.
This is one of the first technical decisions you will face as a non-technical founder. Here is the short version:
See the iOS cost guide and Android cost guide for a full comparison.
Yes. Non-technical founders build apps every day by partnering with a development agency or hiring technical co-founders. Your job is to deeply understand the problem, the users, and the business model. The dev team handles the code. You bring the vision and the domain expertise.
A simple MVP starts around $30,000 to $60,000. A mid-complexity product with multiple user types and integrations runs $80,000 to $200,000. Complex platforms with real-time features, compliance requirements, or marketplace mechanics can reach $300,000 to $500,000+.
Most apps take between 3 and 9 months from idea to App Store. A well-scoped MVP with a quality team typically takes 14 to 20 weeks. Inception and design takes 4 to 6 weeks. Development takes 6 to 14 weeks. Rushed timelines usually produce bugs and scope problems that cost more to fix later.
For most Australian consumer apps, iOS first is the right call. iPhone users in Australia skew higher income and are more likely to pay for apps. Cross-platform frameworks like Flutter let you launch on both simultaneously for a modest cost premium, which is often worth it if your audience is mixed.
A native app lives on a device and is distributed through the App Store or Google Play. A web app runs in a browser. For most consumer-facing products that need push notifications, offline access, camera, or location features, a native or cross-platform app is the right choice. Web apps make sense for B2B tools, admin dashboards, and products that need instant access without a download.
Work with Rebelled
Book a free Game Plan session. We will look at your idea, give you honest feedback on scope and cost, and tell you exactly what we would build first.