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
Fauna: Daily Animal Widget
Discover one remarkable animal every day with Fauna, a beautiful wildlife guide and widget made for curious minds.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
3 ratings · Below Average
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 included16 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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for Fauna: Daily Animal Widget: map the core Lifestyle 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
Regular updates with new animals and facts to keep content fresh.
Assumption to check: Limited animal variety and content may lead to user fatigue
Validate with people who use this workflow before building.
Hypothesis 2
Integrate interactive features to enhance user retention.
Assumption to check: Lack of user engagement features (e.g., quizzes or games)
Validate with people who use this workflow before building.
Hypothesis 3
Implement social sharing to increase organic reach.
Assumption to check: No social sharing options can reduce app visibility
Validate with people who use this workflow before building.
Hypothesis 4
Clarify premium features and their benefits upfront.
Assumption to check: Monetization might be unclear or undervalued
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
Discover one remarkable animal every day with Fauna, a beautiful wildlife guide and widget made for curious minds. A NEW ANIMAL EVERY DAY Explore a collection of 365 species from around the world. Each daily animal includes a vivid photograph, scientific name, memorable fact, habitat information, and conservation status. LEARN AND EXPLORE • Build a daily discovery streak • Save favorite animals for later • Revisit animals in your discovery history • Unlock a new animal by returning each day • Open the full Wikipedia article to continue learning • Share facts and save images using familiar iOS controls • Read the app in 13 supported languages WILDLIFE ON YOUR HOME SCREEN Add Fauna widgets to your Home Screen or Lock Screen and enjoy the animal of the day at a glance. Each widget can independently show the daily animal or one of your custom cycles. Choose from multiple widget sizes, or use the fact widget to discover something new. MAKE YOUR OWN PHOTO CYCLES Turn Fauna’s widgets into a personal rotating display. Create custom collections for pets, family, travel, nature, inspiration, or anything else, then rotate entries daily, weekly, monthly, or in a daily shuffle. Export a local backup package whenever you want an extra copy of your cycles, photos, and preferences. THOUGHTFUL EXTRAS • Set an optional daily discovery reminder • Search, filter, and sort only the animals you have discovered • Configure each widget separately • See source and license details for downloaded Wikimedia images PRIVATE BY DESIGN Fauna requires no account and includes no advertising or third-party analytics. Favorites, viewing history, and custom-cycle photos stay on your devices and are not available to the developer. Animal images and further reading are provided through Wikipedia and Wikimedia Commons. An internet connection is needed to download images and open articles.
Written user reviews are not shown here. Check current App Store reviews >
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
React Native
Expo
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Axios
shadcn/ui
TypeScript
BUILD KIT DIFFICULTY
Intermediate
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.
