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
Hyday MD
Hyday MD 是為閱讀而生的 Markdown 工具。
$0.99 · In-app purchases
PRICE
$0.99
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 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 Hyday MD: map the core Productivity 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
Implement better project management features with drag-and-drop support.
Assumption to check: Users find it hard to manage multiple projects and tasks efficiently.
Validate with people who use this workflow before building.
Hypothesis 2
Introduce a color-coded priority system for better visibility.
Assumption to check: Task prioritization is often unclear and cumbersome.
Validate with people who use this workflow before building.
Hypothesis 3
Offer customizable calendar views and filters for a cleaner layout.
Assumption to check: Calendar views can be cluttered and hard to read.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear value propositions for subscription tiers and a transparent pricing model.
Assumption to check: In-app purchases are often confusing or not worth the cost.
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
Hyday MD 是為閱讀而生的 Markdown 工具。 它原本是為 Hyday 筆記 app 設計的行動閱讀器，讓你能在 iPhone 和 iPad 上舒服地閱讀 Hyday 儲存在 iCloud Drive 的筆記；同時它也是一個通用的輕量 Markdown 閱讀器，任何用其他工具寫的 .md 檔案都能正常顯示。 設計原則 • 不介入語法 — 你的檔案一字不動 • 內容優先 — UI 安靜退到背景 • 排版即設計 — 用字型層次和留白表達層級，不靠裝飾元素 功能 • Frontmatter 解析：title、type、tags、createdAt、lastModified 自動抽出顯示 • 編輯回寫：點編輯、修改、儲存，lastModified 會依本地時區自動更新 • LaTeX 數學公式：行內與獨立區塊兩種寫法都支援 • 程式碼區塊：syntax highlight、語言標示、一鍵複製 • 表格：支援 GFM 對齊語法 • Task list：GFM checkbox 以品牌色渲染 • 本機圖片：依 .md 檔位置解析路徑 • hyday-asset 自訂 scheme：自動對應 vault 根的 assets 資料夾 • Hyday life log 符號：開始、結束、當下、想法、重要，五種狀態用色彩區隔 • 子資料夾瀏覽：只顯示含 markdown 的資料夾，避免列表雜訊 • 最近檔案：直接從首頁跳回最後閱讀的筆記 • 最近資料夾：iOS 安全性作用域 bookmark 持久化，重開 app 不用重選 • 打包字型：Fira Sans Condensed 與 Fira Code，離線也能完整顯示 隱私 • 不蒐集任何使用者資料 • 不串任何分析或追蹤服務 • 沒有網路請求（除非檔案中含網路圖片連結） • 最近檔案、最近資料夾清單僅儲存在你的裝置上 適合 • 有 Markdown 筆記習慣的創作者、工程師、研究者 • Hyday 筆記 app 使用者 • 需要在手機上閱讀技術文件、講義、筆記的人 不適合 • 需要富文字編輯的使用者 • 需要協作、雲端同步版本控制的團隊 • 需要閱讀 PDF、Word 等其他格式
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
react-native-calendars
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.
