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.
*** Please see our "Pro" app for the latest updates, as new features will be added there
$8.99 · In-app purchases
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 Pencil Planner & Draw Calendar: 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 drawing tools compared to dedicated drawing apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Sync issues with external calendars
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Steep learning curve for new users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of customizable themes
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.
*** Please see our "Pro" app for the latest updates, as new features will be added there. This app will continue to be maintained *** Comparable to $30+ physical paper planners, Pencil Planner provides a beautiful set of digital pages/templates to plan out your day, week, month and year. Take your paper agenda into the digital world. Use Pencil Planner to write in your schedule, plans, and goals with ease. Plan daily, weekly, monthly and yearly with this handwritten bullet journal, agenda, and diary. LIKE ON REAL PAPER - NATURAL WRITING EXPERIENCE * Fluent, precise, and completely natural writing experience * Write with the Apple Pencil, Logitech Crayon, or with many capacitive styluses * Select and customize your pen color, thickness, and style (fountain pen, colored pencil, highlighter) * Easily switch between pen, highlighter, and eraser PLANNING YOUR AGENDA IS A BREEZE * Tap on titles to quickly navigate! * Back and forward to previous page * Several writing tools and many different styles * Swipe left/right to go between dates * Dark mode and light mode * Zoom in & pan * Draw with pencil, finger, or other stylus BETTER THAN YOUR PAPER AGENDA * Select and move your handwriting * Undo & Redo * Powerful & smart eraser tool: Choose to erase the entire stroke or only parts of it. Set it to "Erase Highlighter Only" to leave the ink intact * Pinch to zoom and write more precisely * Sync to iPhone for your calendar on the go! DISTRACTION-FREE DIGITAL CALENDAR * Full screen or split screen with other apps * Beautiful templates for day, week, month, year, and year grid * Sync between devices, including iPad and iPhone
Written user reviews are not shown here. Check current App Store reviews >
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.