The document that gets you better quotes, faster scoping, and a development team that actually understands what you are trying to build. Free to use. Copy it, fill it in, and bring it to any developer conversation.
One of the most consistent patterns I see across every project: founders who show up with a written brief get dramatically better outcomes than founders who explain their idea verbally. Better quotes, fewer misunderstandings, faster scoping, and a development partner who respects that you have done the thinking.
A brief is not a 50-page requirements document. It is a 2 to 5 page document that gives a developer everything they need to understand your product and give you an accurate estimate. The structure below is exactly what we ask for at Rebelled when a new founder comes to us with an idea.
How to use this template: Copy each section into a Google Doc. Answer every question as clearly as you can. If you are genuinely unsure about something, say so — a developer can help you decide, but only if they know it is an open question. A brief with three honest "I am not sure yet" sections is better than a brief where you have guessed at every answer.
This is the most important section. Get this right and everything else follows.
Describe the problem in one to three sentences. Write it from the user's perspective, not yours.
Example: Personal trainers spend 4-6 hours per week manually sending workout plans to clients via WhatsApp. There is no way to track whether clients are completing workouts, and clients have no accountability outside of weekly check-ins.
Describe the target user. Include age range, occupation, location, income level, and any other context that is relevant to how they experience the problem.
What is the workaround or existing solution? This tells developers what you are replacing and where the bar is set.
Be specific. "It is clunky" is not useful. "It requires manual data entry for every client and has no mobile app" is.
What the app does and how it solves the problem.
Describe what the app does in two to four sentences. Do not list features yet. Describe the experience.
Example: A mobile app where personal trainers create and assign workout programs to clients. Clients complete workouts in the app, log their results, and coaches can see real-time progress. Includes in-app messaging and automatic check-in reminders.
If this app succeeds, what is the core behaviour that proves the concept? Be specific.
References are incredibly useful. List any existing products — even partial comparisons — that capture some of what you are going for. Include what you like and what you would do differently.
Every person who interacts with the app, their role, and what they do in it.
For each user type: what is their role? What is the main thing they do in the app? What permissions do they have? (e.g. Consumer, Admin, Vendor, Coach, Patient)
Example: Coach: creates programs, assigns to clients, views progress, messages clients. Client: completes workouts, logs results, messages coach. Admin (internal): manages subscriptions and support.
If you had to pick one user type to optimise the experience for, who is it?
What you need for launch versus what can wait. This is where most briefs get too long.
List the features that are required to prove the core concept and launch. Keep this ruthlessly short. If a feature does not directly test your core hypothesis, it is probably v2.
This is as important as the in-scope list. It prevents scope creep and sets clear expectations. Name the features you want eventually but are deliberately excluding from the first build.
List it here so developers can build with extensibility in mind, even if they are not building these features yet.
What you need and what you already have.
iOS only / Android only / Both (cross-platform) / Web app / Web + mobile. If you have a preference, state it. If you are open to recommendations, say so.
Does this app need to connect with any existing software? (CRM, payment gateway, booking system, API, government database, wearable device, etc.) List them here with as much detail as you have.
E.g. Stripe for payments, Twilio for SMS, Google Maps for location, push notifications, video streaming. List anything you expect to be in the product.
Healthcare, finance, NDIS, data storage, children's privacy, age verification. If any of these apply, flag them here. They significantly affect architecture and cost.
How the app makes money affects how it is built.
Subscription, one-time purchase, in-app purchase, commission, freemium, marketplace fee, B2B licensing. Be specific about which model(s) and where transactions happen.
Target price point per user per month, or per transaction. Even a rough number helps developers understand the product tier you are aiming for.
Honesty here saves everyone time.
Give a range, not a single number. "Under $50K", "$50K–$100K", "$100K–$200K". If you have no idea, say so — a developer can give you a ballpark after reviewing the brief, and the cost guide has reference ranges by app type.
Is there a hard deadline (investor demo, seasonal launch, conference)? Or is quality more important than a specific date?
IP sensitivities, NDA requirements, team capacity, existing contracts with other vendors — anything a dev team should know before committing.
How will you know if v1 worked?
Name specific, measurable outcomes. Number of users, retention rate, revenue, conversions, reviews. Vague success criteria lead to vague products.
Example: 50 paying coaches active within 90 days. Each coach has at least 5 active clients in the platform. 70% of clients who complete their first workout return within 7 days.
The north star. If you could only track one number, what would prove the concept is working?
That is the full brief. If you have answered every section honestly, you have done more pre-work than 90 percent of founders who walk into a developer meeting. The result is a conversation that starts at "here is how we scope and build this" rather than "tell me more about your idea."
Send it to Rebelled: If you have filled this out and want an honest scope assessment, book a free Game Plan session. We will read your brief before the call, come prepared with questions, and give you a real cost and timeline estimate by the end.
A good app development brief covers: the problem you are solving and who has it, the target users with demographics and context, the core workflow, all user types and their roles, the features you want in v1 vs v2, platform preferences, your budget range, and your target launch date.
Not technically, but founders who show up with a written brief get better quotes, faster scoping, and more accurate timelines. Without a brief, every developer question is a delay. A brief takes a few hours to write and saves weeks in back-and-forth.
Two to five pages is ideal. Long enough to give a developer everything they need to quote accurately, short enough to stay focused. If your brief is longer than ten pages, you are probably including things that belong in a requirements document, not a brief.
Work with Rebelled
Send us your brief and book a free Game Plan session. We will review it before the call and come back with a scope assessment, cost range, and honest feedback on what to build first.