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.
App Overview
Collins British Bird Guide
Collins British Bird Guide takes 264 of the most commonly seen British & Irish bird species from the award-winning Collins Bird Guide and presents them in the same easy-to-use practical format
$7.99 · In-app purchases
PRICE
$7.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
1 ratings · Top 30%
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Collins British 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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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Expand database with more bird species and details
Assumption to check: Limited bird species compared to comprehensive guides
Validate with people who use this workflow before building.
Hypothesis 2
Include social sharing options for users to share favorite birds
Assumption to check: No social features for sharing discoveries
Validate with people who use this workflow before building.
Hypothesis 3
Implement a mechanism for regular content updates
Assumption to check: Static content may become outdated
Validate with people who use this workflow before building.
Hypothesis 4
Add interactive quizzes to enhance user engagement and learning
Assumption to check: Lack of interactive features like quizzes
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
Collins British Bird Guide takes 264 of the most commonly seen British & Irish bird species from the award-winning Collins Bird Guide and presents them in the same easy-to-use practical format. Search for a species by location, time of year or plumage traits; browse the stunning illustrations by Killian Mullarney and Dan Zetterström; read the authoritative text by Lars Svensson; check distribution against the up-to-date maps taken from Bird Atlas 2007–2011; or listen to any of the hundreds of sound recordings. Praise for the Collins Bird Guide app: ‘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 Features include: ‣ 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 550 carefully selected songs and calls – many by author Lars Svensson ‣ Select species names from 30+ languages ‣ Expertly edited video clips for every species in the app (require in-app purchase) ‣ Weighs nothing! Identify Assist is our brand-new subscription service. Instantly identify species from photos and recordings with cutting-edge AI. 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/
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
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BUILD KIT DIFFICULTY
Expert
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.
