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.
Most task managers want you to organize everything
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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 Carbon - Tasks, Simplified: 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 organization features like tags and subtasks
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of collaboration tools for shared tasks
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No calendar integration for due dates
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Basic notifications for due tasks
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.
Most task managers want you to organize everything. Carbon wants you to focus on what matters. Carbon gives you three cards: • Today — what matters right now • Next — important tasks for later • Someday — ideas and long-term goals That's it. No projects, no folders, no endless customization. Just three cards and the clarity to actually get things done. NATURAL LANGUAGE INPUT Type naturally and Carbon understands. "Call dentist tomorrow 2pm #health @Sarah" automatically extracts the date, time, tag, and delegate. No forms, no menus — just type. SIGNAL STATES Go beyond simple checkboxes. Mark tasks as pending, in progress, done, delegated, migrated, or follow-up. One tap to cycle through. Your tasks tell a story. SYNC EVERYWHERE Changes sync across iPhone, Mac, Windows, Linux, and web in seconds. Pick up exactly where you left off. FEATURES - 3 card types (Today, Next, Someday) - Up to 5 tasks per card - Task metadata (dates, times, tags, delegates, notes) - Natural language parsing - 5 signal states - Smart notifications - Swipe gestures and undo - Light / dark / system theme - 21 hand-crafted app icon variants - 15 accent color themes - Unlimited tasks per card - Unlimited archive history - Cloud sync across all devices - Voice capture — add tasks by speaking - Drag-and-drop task reordering - Home screen widgets with interactive controls - Multiple Today cards (overflow support) - Tag filtering across all cards - Card progress dots - Pomodoro timer built-in - Insights and patterns into how you work NO SUBSCRIPTIONS Pro is a one-time purchase per device. Pay once, own it forever. No recurring charges, no annual renewals, no "you've been unsubscribed" emails. Built by an indie developer who believes productivity tools should help you do less organizing and more doing. Plan less. Do more. Cheers, Shawn
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.