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
出行轨迹
出行轨迹：无需登录或注册，打开即可自动记录你每天的出行轨迹。
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
18 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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 出行轨迹: map the core Travel workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
出行轨迹：无需登录或注册，打开即可自动记录你每天的出行轨迹。 【迁移到全新 App「足迹·TimeTrails」】 足迹是出行轨迹的全新版本，更省电、更稳定。在「更多 → 迁移到足迹」，或长按出行轨迹图标选择「迁移数据到足迹」，即可一键导出全部轨迹并导入足迹，不需要联网，也不会删除出行轨迹中的数据。 【实用特性】 - 后台自动记录出行轨迹，无需手动开始或停止 - 自动分析当天的步数、距离与出行方式 - 在地图上查看与回放轨迹，查看每一个 GPS 坐标点 - 中国大陆地区坐标自动纠偏，全球其他地区同样可用 - 支持导入 GPX 文件，支持导出、分享轨迹数据与图片 - 支持 iCloud 备份，支持 iPhone、iPad 与 Apple Watch 【使用体验】 - 地图显示流畅，后台运行耗电极少 - 轨迹数据保存在你的设备上，无广告，不接入第三方统计或追踪服务 这是一款记录你出行足迹的 App。时间容易让人遗忘，三天前的事情可能已经记不太清；但如果知道当时去了哪里、拍了哪些照片，或许就能唤醒记忆深处那些美好的回忆。 电池使用：持续在后台使用 GPS 会缩短电池续航时间。
Written user reviews are not shown here. Check current App Store reviews >
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
Integrate with booking services for a seamless experience.
Assumption to check: Limited integration with third-party travel services
Validate with people who use this workflow before building.
Hypothesis 2
Implement strict data protection measures and transparency.
Assumption to check: User data privacy concerns
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to access route information without internet.
Assumption to check: Lack of offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Provide users with more customizable trip planning tools.
Assumption to check: Limited customization options for trips
Validate with people who use this workflow before building.
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
react-navigation
@react-native-maps
Axios
BUILD KIT DIFFICULTY
Advanced
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.
