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
牛津英语 English File -Elementary
English File 系列教程独特、生动、有趣，素以“让学生开口说英文”的特色为人所知。
$1.99 · In-app purchases
PRICE
$1.99
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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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 牛津英语 English File -Elementary: map the core Shopping 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 diverse learning materials, such as videos and interactive games.
Assumption to check: Limited content variety in language learning apps
Validate with people who use this workflow before building.
Hypothesis 2
Add gamification elements like rewards, badges, and leaderboards.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 3
Offer a freemium model with quality free content and paid premium features.
Assumption to check: High churn rate due to subscription costs
Validate with people who use this workflow before building.
Hypothesis 4
Implement personalized feedback based on user performance to enhance learning.
Assumption to check: Inadequate feedback mechanisms
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
English File 系列教程独特、生动、有趣，素以“让学生开口说英文”的特色为人所知。 本系列初级着重发音训练、词汇、语法，可帮助学生打好英文基础；中级、中高级则着重会话、阅读、听力及写作练习，可使学生快速达到学习目的。 本系列含丰富的教学资源，包括辅助教材以及完整的学习计划，可以让学生用起来得心应手。 系列特色： 1）课程编排均衡，涵盖语法、词汇、发音及技能； 2）戏剧、访谈及纪录片视频帮助学生学习自然地道的英语； 3）iTutor,iChecker 和 iTools 实现个性化学习及辅助教学； 4）发音应用程序让学生随时随地练习口语。 第4版新增： * 基于English File教师反馈，更新了文本内容、话题、听力材料； * 每个偶数单元加入了视听活动，比如纪录片或戏剧片段，使课堂气氛更活跃； * 在线练习中包含发音视频，学员可在此观看正确、地道的英文发音视频，参与到Rob和Jenny的短剧中。 English File 4th Edition，适用于中学，本应用配套Elementary级别。 建议使用年级： Beginner级别--与小学衔接，Elementary--初一，Pre-Intermediate--初二，Pre-Intermediate--初三，Intermediate Plus--初高中衔接，Upper Intermediate--高一，Advanced--高二 。 Elementary 级别课本目录： A Welcome to the class B One world C What's your email? Practical English Episode 1 A Are you tidy or untidy? B Made in America C Slow down! Revise and Check 1&2 A Britain:the good and the bad B 9 to 5 C Love me, love my dog Practical English Episode 2 A Family photos B From morning to night C Blue Zones Revise and Check 3&4 A Vote for me! B A quiet life? C A city for all seasons Practical English Episode 3 A A North African story B The third Friday in June C Making music Revise and Check 5&6 A Selfies B Wrong name, wrong place C Happy New Year? Practical English Episode 4 A A murder mystery B A house with a history C Room 333 Revise and Check 7&8 A #mydinnerlastnight B White gold C Facts and figures Practical English Episode 5 A The most dangerous place... B Five continents in a day C the fortune teller Revise and Check 9&10 A Culture shock B Experiences or things? C How smart is your phone? Practical English Episode 6 A I've seen it ten times! B He's been everywhere! C The English File interview Revise and Check 11&12 Communication Writing Listening Grammar Bank Vocabulary Bank Irregular verbs Sound Bank
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
Supabase
Zustand
React Navigation
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.
