You have an app idea for your business and want to ask for quotes. The first instinct is often to look for a forty-page requirements template. For a small business, that rarely helps: nobody reads it all, and it locks in choices that are better tested on a mockup.
What you need is a short document that answers the right questions. Here is the template I recommend, in ten sections, followed by a filled-in example for a field service app. If your project is mostly about replacing a spreadsheet, also read replacing Excel with a custom app: the existing file often does half the work.
What is a mobile app requirements document for?
It has three uses, and only three:
- Getting comparable quotes. Without a shared document, each developer imagines a different app, and prices stop meaning anything.
- Agreeing internally. The owner, the field manager and the person handling admin do not picture the same app. Writing their views side by side surfaces disagreements before development starts.
- Defining version one. The document separates what is essential at launch from what can wait. That decision weighs more on cost and timing than any other.
Five to ten pages are enough. Plain sentences, lists and one or two hand-drawn screen sketches beat technical vocabulary.
What should a mobile app requirements document include?
Here are the ten sections to fill in. Copy them into a document and answer each question in a few lines.
- 01
Context
Your business in three lines, the current problem, how it is handled today (paper, spreadsheet, software) and what it costs in time or mistakes.
- 02
Goal
One sentence you can check: "stop retyping job sheets" rather than "modernize our operations".
- 03
Users and roles
Who uses the app, how many people, how often, and what each one must be able to see or change.
- 04
Key user flows
Two or three scenarios told step by step: "the technician opens the app, sees the day, arrives at the customer's..."
- 05
Features, ranked
A list with three levels: essential for version one, useful, later.
- 06
Screens
The list of main screens, ideally with a sketch. No design needed: a rectangle and a few words are enough.
- 07
Data
What the app stores (customers, jobs, photos, signatures), who is responsible for it, and existing data to migrate.
- 08
Integrations
The tools the app must exchange data with: invoicing software, calendar, CRM. Write the exact name of each tool so its API can be checked.
- 09
Constraints
iPhone, Android or both, offline use, camera, notifications, personal data, and publishing to the stores with developer accounts in your company's name.
- 10
Framework
The budget or range you have in mind, the target date and why, who tests each version on your side, and what you expect after delivery (maintenance, new features).
Section 09 is often forgotten, and it is the one that causes surprises. Publishing on the App Store and Google Play requires paid developer accounts and, for a company, a D-U-N-S number: I break down those fees in how much a mobile app costs in 2026.
What does a completed requirements document look like?
Fictional example. The company below does not exist. It shows the level of detail expected, section by section. Replace each answer with your own.
Context and goal
A boiler maintenance company with eight technicians, around forty jobs a week for homeowners and property managers. Today: the schedule lives in a spreadsheet, job sheets are on paper and retyped in the evening by the office assistant, and reports reach the customer several days later. Goal: send the job report to the customer the same day, with no retyping.
Users and roles
- Technicians (8): see the day's jobs, fill in the job sheet, take photos, get the customer's signature. They do not see prices.
- Office assistant (1): creates and assigns jobs, tracks statuses, sends reports, prepares invoicing.
- Owner (1): sees everything, including activity per technician.
Main user flow
The technician opens the app in the morning and sees the jobs in order. On site, they open the job sheet, tick the checks done, add two or three photos, note the parts replaced and have the customer sign on screen. They confirm: the PDF report is emailed to the customer, and the job moves to "to invoice" on the office side. With no signal in a basement, the sheet is saved and sent as soon as the network is back.
Ranked features
| Feature | Priority | Why |
|---|---|---|
| Today's job list | Essential | The technician's starting point |
| Job sheet, photos, signature | Essential | The whole point of the app |
| PDF report emailed to the customer | Essential | Removes manual sending |
| Offline mode | Essential | Basements and boiler rooms with no signal |
| Office screen: create and assign jobs | Essential | Replaces the scheduling spreadsheet |
| Export to invoicing software | Useful | A simple export is enough at first |
| Reminder to the customer the day before | Useful | Fewer missed appointments |
| Statistics per technician | Later | Useful to the owner, not day to day |
| Portal for property managers | Later | To decide after six months of use |
Data, integrations and constraints
- Data: customers and addresses, equipment (brand, model, install date), jobs, photos, signatures. Customer list migrated from the current spreadsheet.
- Integrations: export of "to invoice" jobs to the invoicing software (exact name to confirm, API to check).
- Constraints: Android phones and iPhones (technicians use their own phones), offline mode, camera, customers' personal data visible only to the technicians concerned, developer accounts in the company's name.
Framework
First version wanted before the heating season. Named testers: the most senior technician, with the office assistant. After delivery: monthly maintenance and one new feature per quarter.
How do you prioritize features for version one?
For each feature, ask a single question: if we remove it, does the app still meet its goal? If yes, it is not essential. In the example, statistics are interesting, but without them the report still goes out the same day.
Two more markers help you decide:
- How often it is used. A feature used forty times a week comes before one used once a month.
- The cost of waiting. If something can be done by hand for a few months without real pain, it can wait for the next version.
A small first version used every day will teach you more than any requirements document. That is why I build apps in two-week sprints, with a version to test on your phone at the end of each: it is the method I describe on my mobile app development page.
What mistakes should you avoid in a requirements document?
- Describing solutions instead of needs. "A dropdown menu on the left" closes options. "The technician must find a customer in under three taps" opens them.
- Copying a big company's app. Its features were built by whole teams over years. Keep the idea, not the feature list.
- Forgetting the office side. A field app almost always needs a screen for whoever organizes the work. It counts just as much in the quote.
- Not naming a tester. Without someone to try each version on real cases, problems show up after launch.
- Keeping the budget secret. A range, even a wide one, lets the developer propose the best first version within it.
When can you skip the requirements document?
A written document is not always the best way in. For a small app, a conversation and a mockup often work better: you see the screens, you correct them, and the scope is set on something concrete. That is how I work: a free 30-minute call, then a free mockup built around your case, presented at a second meeting, and a fixed-price quote at the end of that demo.
The document is still useful if you are consulting several developers, if several people must sign off on the project, or if funding requires something in writing. Either way, going through the ten questions before the first meeting will save you time.
Have an app idea and a few notes? Book a 30-minute call and we will look at what belongs in the first version.
Sources checked on October 17, 2026
- Apple Developer, enrolling in the program (D-U-N-S number for organizations)
- Google Play Console Help, D-U-N-S number for organization accounts
Frequently asked questions
How do I write a mobile app requirements document?
Answer ten sections in a few lines each: context, goal, users, user flows, ranked features, screens, data, integrations, constraints and framework (budget, timing, tester). Five to ten pages are enough for a small business.
How is a mobile app spec different from a web app spec?
The structure is the same. A mobile app adds its own constraints: iPhone and Android, offline use, notifications, camera, and publishing on the App Store and Google Play with developer accounts.
Do I need a requirements document to get an app quote?
Not necessarily. It helps when comparing several developers. For a small app, a conversation and a mockup of the screens can replace a long document and set the scope on something concrete.
How long should an app requirements document be?
For a small business, five to ten pages. What matters is that every feature is ranked by priority and that the first version is clearly defined.
Who should write the requirements document?
The company ordering the app, together with the people who will use it. The developer can then add to it, especially on technical integrations and store publishing constraints.