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.
‘It’s much more convenient than taking a big book with you...the Collins app is fantastic.’
$14.99 · 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 Collins Bird Guide: 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 regional bird identification data
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High price point for some users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficult to navigate for new users
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.
‘It’s much more convenient than taking a big book with you...the Collins app is fantastic.’ – Chris Packham, Metro ‘The Collins Bird Guide app is destined to become a real triumph, the ultimate in field guide apps — and deservedly so.’ – BirdGuides The Collins Bird Guide App combines world-class illustrations and comprehensive information with intuitive design to create the ultimate field guide for passionate birders and casual birdwatchers alike. The app is based on the landmark book by Lars Svensson, Killian Mullarney and Dan Zetterström, universally acknowledged as the standard European field guide. This definitive work has been reimagined for iPad and iPhone by birders for birders. The Collins Bird Guide App provides everything you need to identify a species quickly and learn about it thoroughly. Immerse yourself in the exceptional illustrations, maps, calls and concise text. Use the powerful search filter and curated confusion lists to focus in on a species. The Collins Bird Guide App is an essential companion always to hand on your iPhone, and available to browse in full glory on your iPad. Features include: ‣ 973 species covered - 843 illustrated ‣ 3,700+ beautiful illustrations by Killian Mullarney and Dan Zetterström ‣ Detailed text covering habitat, range, identification and voice by Lars Svensson ‣ Record sightings, location and date with the listing tool ‣ Powerful search filter ‣ Intuitive design to quickly and easily swipe through species ‣ Curated lists of confusable species ‣ Over 1,100 carefully selected songs and calls – many by Lars Svensson ‣ Select species names from 30+ languages ‣ Expertly edited video clips for 811 species in the app (require in-app purchase) ‣ Available in English, Swedish, Norwegian, French and German ‣ Weighs nothing! Identify Assist is our brand-new subscription service. Instantly identify species from photos and recordings with cutting-edge AI. As well as this and the optional video library, the app incorporates British Trust for Ornithology/BirdWatch Ireland/Scottish Ornithologists' Club Bird Atlas 2007–11 mapping data as an in-app purchase, providing the most comprehensive location mapping of any bird guide app. The latest version of the app requires iOS 17.0 or later. If you like the app, don’t forget to share the app, rate it and leave a review. Privacy Policy natureguides.com/privacy-policy Terms of Use apple.com/legal/internet-services/itunes/dev/stdeula/
Written user reviews are not shown here. Check current App Store reviews >
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.