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
Japanese Birds 50
Japanese Birds 50
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Japanese Birds 50: 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
Introduce quizzes or games about bird species.
Assumption to check: Limited interactivity and user engagement.
Validate with people who use this workflow before building.
Hypothesis 2
Provide in-depth articles or audio descriptions for each bird.
Assumption to check: Potential lack of detailed information.
Validate with people who use this workflow before building.
Hypothesis 3
Add a social feature for users to share sightings and tips.
Assumption to check: No community features for sharing experiences.
Validate with people who use this workflow before building.
Hypothesis 4
Implement regular updates with seasonal bird information.
Assumption to check: Static content may become stale over time.
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
Japanese Birds 50 This app guides for 50 species of birds in Japan with photos, descriptions, and sounds. You can browse birds alphabetically with English name or family name. Search for birds with word is available by typical operation. Japanese name could be convenience when you talk to Japanese bird watcher. ex. “Red-crowned Crane” is “Tan-cho” in Japanese name. It has also glossary and terminology in Japanese and English. Use the lists feature to make own list with your interest, and lifelist. Sample lists included, The three great voices of Japan, Natural monument of Japan. This app developed by Enwit Inc. with texts and sounds by Hideo Ueda, photos by Takuya Kanaouchi, translation by Susan Ishida. Original books is published by Bunichi-Sogo Syuppan., Co. Ltd. ******Update History***** 1.4.1 - Build for iOS 14 - Fixed bugs of display on some devices. 1.4.0 - Build for iOS 11 - Adjust for 4.7 inch, 5.5 inch screen size - Added link to Wikipedia ja/en - Fixed minor bugs 1.2.0 -Support screen size of iPhone 5 and iOS 6. -This version is based on Check-list of Japanese Birds, 7th revised edition by The Ornithological Society of Japan (Preference selects 6th edition or 7th.) -Access to another species of same family in detail screen. -Photos is positioned on horizontal scroll. -Play by speaker mode over mute added. Default mode is not play by speaker if OS set to mute. In field play by speaker is sensitive to another bird watcher and wild birds. -Link to Wikipedia -Link to Smart Birding, movie app. ***************************
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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
React Native
Expo
Zustand
Axios
React Navigation
Native Base
BUILD KIT DIFFICULTY
Starter
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.
