“Customers can book and pay through the app.” It sounds like a clear feature until someone asks what happens when a class is full, a payment fails, or a customer cancels ten minutes before it starts.
Those details are where the work is. A useful app development brief gives a developer enough context to spot them before they become extra cost halfway through a build.
You can write a first brief in plain English. A few considered pages, a rough sketch and a list of open questions are enough to start a productive conversation. Here’s what to put in it, followed by a template you can use.
Start with the job your app needs to do
Explain who will use the app, what they do today and where that process gets awkward. “We need an app for our members” leaves a lot of room for interpretation. “Members message us to book a session, and a member of staff checks a spreadsheet before replying” gives everyone something concrete to work with.
Then describe the change you want. Perhaps members should see availability and book without waiting for a reply. Perhaps staff need to stop entering the same information twice. Pick a result you could check after launch, such as the proportion of bookings completed without staff help.
There may be a simpler way to solve the problem using your existing website or booking software. Include what you’ve already tried and why it falls short. That helps a developer judge whether a custom app is a sensible next step.
Describe a complete first release
Write out one important journey from beginning to end. For a booking app, that could be: a member signs in, finds an available session, checks whether their membership covers it, books, receives confirmation and can find the booking again later.
Now add the awkward bits. Can they cancel? Can staff cancel on their behalf? What happens if two people try to book the last place? You don’t have to design the solution, but the brief should make the question visible.
A feature a developer can estimate
Too open: “Push notifications.”
More useful: “Send a reminder before a booked session. Members can turn reminders off. If the session changes, the booking screen must show the new time even if the member never sees a notification.”
For each essential feature, add a sentence explaining how you would check it works. For cancellations, that might be: “Once a member cancels, their place becomes available again and staff can see the cancellation.” These sentences make it easier to agree what “finished” means.
Keep a separate list for later ideas. Referrals, loyalty points and a community feed might all be useful, but they do not have to be part of the same release. If you’re still working out that boundary, our guide to planning an MVP app covers the first-version decision in more detail.
Include the work behind the screens
A customer-facing app usually needs someone to keep it running. Who adds a class, changes a price, removes an account or corrects a mistake? Can a receptionist see the same information as the owner? Does that person need a dashboard on a laptop?
Put these jobs in the brief alongside the customer features. An app with five screens can still need a substantial management system. For a staff or client portal, describing permissions and handovers may be more useful than listing screens. Our business app development page gives examples of those kinds of workflows.
List the tools the business already uses, including booking software, payment services, spreadsheets and customer databases. Say which system should hold the main record. If staff change a session time in the existing booking tool, should the app pick that up automatically?
Don’t assume two products can connect just because they both handle bookings. Ask the developer to check the available integration before committing to a price. If that check hasn’t happened, the quote should say what is being assumed. Mention any data that needs moving, but use anonymised examples in an initial brief.
Give the budget and deadline some context
A budget range helps a developer propose a version you could actually commission. If the whole idea won’t fit, ask which part could be delivered within the range and what you would give up. You can read our UK app development cost guide alongside the brief when planning that conversation.
Separate the build budget from the money available to run the app. Ask for hosting, maintenance, usage charges and any paid services to be identified in the proposal. A monthly support fee also needs a clear description of what it covers and how new features are priced.
For timing, explain the reason behind the date. A launch tied to a venue opening has different constraints from “ideally this autumn”. Include time for your team to review designs, supply content and try the app. If it will go through an app store, ask how submission and possible review changes fit into the schedule.
It is fine to write “please advise” beside iPhone, Android or web. Tell the developer what you know about your users’ devices and how they will use the product. Likewise, describe any need to work without a connection or to support particular accessibility needs early, while the scope is still flexible.
An app development brief template you can use
Copy these prompts into a document or download the plain-text version. Short answers are fine. An unanswered question is more useful than a confident guess.
Download the brief template- Business and contactYour business or working app name, who will make decisions, and how to reach them.
- The problemWho the app is for, how they do the task today, and what makes that difficult.
- The main journeyOne task from start to finish, including what happens if it fails, changes or is cancelled.
- First releaseThe essential features in priority order, what can wait, and how you’ll check each feature works.
- People behind the appWho manages it and what each role can see or change.
- Existing systems and dataTools to connect, information to move, and which system holds the main record.
- Platforms and designDevices, accessibility or offline needs, brand assets, and references with a note about what you like.
- Budget and timingBuild budget, running budget, target date and the reason for it.
- Launch and handoverHelp needed with submission and training, plus the source code, files, account access and support to agree.
- Success and open questionsWhat would make the first release worthwhile, how you’ll measure it, and where you need advice.
What a short brief could look like
Worked example · An imaginary training studio
“We run small-group training sessions. Members currently message the studio to book, and staff check availability manually. We want members to book a place themselves and find their upcoming sessions in one place.
“For the first release, members need to sign in, see available sessions, book and cancel within our cancellation window. Staff need to manage the timetable, change capacity and cancel a session. We need advice on how existing membership records could connect.
“Loyalty points and a community feed can wait. We want a quote for the booking journey first, with assumptions about the membership connection written out. Our budget and preferred launch date are included separately.
“We’ll judge the first release by how many bookings members complete without messaging us. We’d like help choosing the platforms and agreeing what to measure.”
That is enough to begin a scoping discussion. The next step would be to pin down the cancellation rules, the membership system, budget and platform choice. The brief can develop as those questions are answered.
Use the same brief when comparing quotes
Send each developer the same starting document. If one quote includes an admin dashboard, both mobile platforms and launch support, while another includes only the customer app, the totals tell you very little on their own.
Ask each proposal to set out:
- The features and platforms included in the price, plus any exclusions.
- Assumptions that still need checking, especially integrations and data migration.
- What you need to provide and when you need to review the work.
- How changes to the agreed scope will be estimated and approved.
- What happens at launch: account access, source code and design handover, support and ongoing charges.
Keep an agreed copy of the scope when you choose a developer. If you later add something, record the effect on price and timing before the work starts. It saves both sides trying to remember what was said on a call.
At APPRO Digital, we work with founders and businesses from our studio in Kent. You can bring us a completed brief or a handful of notes; we’ll talk through the first release and agree the scope and project price before development begins.
