Feature spec
Goal: Send a clear invoice after finishing a job.
- Add a client, line items, a due date, and payment instructions.
- Preview the total before exporting a PDF.
- Keep an editable draft if export fails.
Birds Of Britain Pro is a guide to over 300 British birds, native and naturalised, with specially written text, professionally produced bird songs and calls, and carefully selected photos showing a variety of plumages
$13.99 · In-app purchases
Evidence scope: No current overall US chart position is available. Category-chart positions shown in discovery are a separate scope. Revenue is a directional model estimate, not verified earnings.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
Invoice editor: Client at the top, editable line items in the middle, total and preview action at the bottom.
States: Empty draft, validation errors beside each field, exporting, and a retry action that preserves the draft.
Hypothesis: Contractors need faster repeat invoices more than more templates.
First experiment: Test duplicating a previous job with five contractors. Watch where they hesitate before expanding the feature set.
The full kit adds a phased build plan, evidence notes, tool prompts, and implementation guidance. It is a plan for your coding agent, not a finished app.
Usage: Mechanics are fair game; never reuse the original name, branding, assets, or verbatim copy.
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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Birds of Britain Pro: map the core Reference workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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These are generated suggestions, not verified review quotations. Check current App Store reviews and speak with users before treating a possible gap as a requirement.
Hypothesis 1
Assumption to check: Limited interactive features compared to other reference apps.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High initial cost discourages some users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of community features for sharing discoveries.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline access to bird sounds.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Birds Of Britain Pro is a guide to over 300 British birds, native and naturalised, with specially written text, professionally produced bird songs and calls, and carefully selected photos showing a variety of plumages. You can add your own photos to the app to compliment the images provided and to really make the app your own. In addition, this is the only quality bird app to include extensive record keeping features with iCloud syncing to keep your data safe. The app knows the names of a further 350 species that have visited or might visit Britain in the future, so that notes can be kept and they can be marked as seen. "A twitcher's dream" - Matt Bingham, The Sunday Times Selected by Apple for their "What's Hot" list since launch. Birds of Britain Pro is a field guide: • High quality photos for each bird, showing a selection of male, female, juvenile, alternate plumage, flight image and nest • For many birds, an annotated photo shows key features, to help distinguish similar species • Add your own photos of the bird or its habitat • Specially written text covers rarity status, distribution, appearance, habitat, diet, lifespan, nesting habits, and more • Recordings of songs and calls • European distribution map for each bird • Make a shortlist of favourite birds for fast access • 'Here and Now' feature shows birds in your part of the country and this time of year • Search by name, scientific name, part of name • Sort alphabetically by name or second name, by taxonomic group, or by length Birds of Britain Pro is a bird identifier: • Use the 'Bird Finder' for fast identification of unknown birds • Enter details such as size, colour, bill length and other features, date, habitat and location to select a shortlist • Results are presented as a display of photos so that you can quickly spot the best match Birds of Britain Pro is a record keeper: • Mark birds as seen, note the location, time and date, make notes, view your records on a map or as a list, and download as a CSV file. • Add your own photos to your sightings • The app includes iCloud syncing so that your sightings will automatically synchronise across your devices (it is initially off, so if you would like to use it, please go to the Settings section of the app to enable it). • You can transfer your sightings to someone else's device by using the email back-up. • The app recognises the names of over 650 species and subspecies, so that you can record sightings and add your own photos of these birds. We have many years experience of developing biological software and this has enabled us to pack the app full of features while keeping it simple and easy to use. To get in touch: Email: [email protected] Contact form: www.spinysoftware.com/contact Facebook: www.facebook.com/ispinynatureguides
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
From the Build Kit assessment.
A reliable timeline needs an agreed scope and a technical check. Ask your agent to estimate the phases in BUILD_PLAN.md after that review.