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.
A high-quality digital field guide, with bird names in 15 languages, covering 352 species of birds regularly seen in Northern Europe
$20.99 · 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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Generating… usually about a minute.
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 Northern Europe: 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 bird information and images compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Navigation can be confusing for first-time users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social sharing features.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Infrequent updates to bird database.
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.
A high-quality digital field guide, with bird names in 15 languages, covering 352 species of birds regularly seen in Northern Europe. This list covers all except rarer vagrants and includes every bird likely to be seen by the vast majority of birdwatchers in the region throughout the year. Countries covered include Britain, Ireland, Iceland, Norway, Sweden, Finland, Denmark, Holland (The Netherlands), Belgium, Germany, Poland, Latvia, Lithuania, Estonia, Luxembourg and Northern France. Comprehensive information is provided including: multiple annotated illustrations by leading artists showing the full range of plumages including rarer races and variations, beautiful still photographs for many species; songs and calls, maps showing distribution in Europe, North Africa and the Middle East and the full detailed text accounts from the Concise edition of Birds of the Western Palearctic (THE standard reference work originally published by Oxford University Press). Perfect for more experienced birders who will appreciate the comprehensive and professional ornithological content in this App. FEATURES • fully compatible with iPad using the full resolution of its larger screen • species names translated into 13 languages plus International English and US English • includes audio recordings of songs and calls • annotated illustrations by top bird artists including Ian Lewington, Alan Harris, Mike Langman and DIM Wallace • superb portrait photographs for many species • definitive text accounts from the Concise edition of Birds of the Western Palearctic • information on typical behaviour, identification and plumage variations • many images showing nests, eggs and flight shots • detailed distribution maps for the whole Western Palearctic region • quick search by species name or part of name • organise bird names alphabetically or by family, with collapsible headings • intuitive navigation uses gestures and flip-to-horizontal mode • pinch zooming for visual assets NAMES IN 15 LANGUAGES Species and family names can be in any of the following languages, and changed at any time: Català, Dansk, Deutsch, English, English (International), English (US), Español, Français, Italiano, Nederlands, Norsk, Português, Suomi, Svenska, русский язык (Russian). Note that the species text accounts, assets captions and illustration annotations are in English only.
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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.