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
走遍美国英语口语学习
走遍美国是美式英语教学专家的精心之作。整个英语学习课程分为78课，适合有一定英语基础的初级英语学习者，可以用作在校学生的基础英语教材或英语口语教材。
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
34 ratings · Top 15%
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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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 走遍美国英语口语学习: map the core Education 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
Incorporate gamification elements like streaks and XP.
Assumption to check: Limited interactive features for engaging users
Validate with people who use this workflow before building.
Hypothesis 2
Add offline downloads for lessons.
Assumption to check: Lack of offline capabilities for lessons
Validate with people who use this workflow before building.
Hypothesis 3
Provide detailed feedback and explanations for quiz answers.
Assumption to check: Limited feedback on quiz performance
Validate with people who use this workflow before building.
Hypothesis 4
Implement daily reminders to encourage consistency.
Assumption to check: No daily reminders for learning
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
走遍美国是美式英语教学专家的精心之作。整个英语学习课程分为78课，适合有一定英语基础的初级英语学习者，可以用作在校学生的基础英语教材或英语口语教材。 -MP3支持中英同步字幕，支持中英/英/中三种字幕切换；支持循环/单篇/单句循环模式切换； -支持变速播放； -长按即可查单词，可加入生词本； -支持句子收藏及播放功能； -支持文字大小自由调节；支持锁屏控制及线控； -走遍美国全部视频支持全屏播放，含中英字幕，一键下载离线播放。 -支持生词测验，多练习才是硬道理！
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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
Supabase
React Navigation
Zustand
expo-video
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.
