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.
Stay Committed
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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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for CheckMark: Progress Tracker: 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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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
Assumption to check: Limited task management features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of analytics and reporting on task progress
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No collaboration features for team projects
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Minimal customization options
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Stay Committed. Track Progress. CheckMark It Done. CheckMark is a simple, flexible progress tracking app that helps you stay committed to any structured program you're working through. Whether it's a 30-day fitness challenge, 100-day reading plan, language course, or personal habit—CheckMark makes it easy to track your progress and build consistency. WHY CHECKMARK? Life is full of programs and challenges we want to complete, but staying consistent can be hard. CheckMark gives you a clear, visual way to track your daily progress and celebrate every step forward. The simple act of checking off each day keeps you motivated and accountable. FEATURES Flexible Program Tracking - Create custom programs for any goal: workouts, reading challenges, online courses, meditation streaks, or skill-building plans Daily Check-offs - Mark each day or task complete as you progress through your program Progress Visualization - See exactly how far you've come with clear, at-a-glance progress tracking Social Sharing - Share your programs and progress with friends for accountability and motivation Clean Interface - Focus on your goals without distraction or complexity PERFECT FOR - 30-day fitness and workout challenges - 100-day reading programs - Language learning courses - Meditation and mindfulness streaks - Skill-building and personal development programs - Any structured goal or habit you want to complete HOW IT WORKS Create a program with the number of days or tasks Check off each day as you complete it Watch your progress grow Share your achievements with friends Stay motivated and build lasting consistency CheckMark doesn't tell you what to do—it simply helps you stay committed to whatever you've chosen to accomplish. Simple, powerful, and designed to keep you on track. Download CheckMark today and start building the consistency that leads to real results.
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Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.