App Overview

Carbon - Tasks, Simplified icon

Carbon - Tasks, Simplified

Shawn Schwartz · Productivity

Most task managers want you to organize everything

$2.99 · In-app purchases

PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
1 ratings · Top 5%

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 included17 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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
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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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

Include tagging and subtasks for better task management.

Assumption to check: Limited task organization features like tags and subtasks

Validate with people who use this workflow before building.

Hypothesis 2

Introduce project sharing and team collaboration features.

Assumption to check: Lack of collaboration tools for shared tasks

Validate with people who use this workflow before building.

Hypothesis 3

Add calendar sync for better deadline tracking.

Assumption to check: No calendar integration for due dates

Validate with people who use this workflow before building.

Hypothesis 4

Enhance notifications with reminders and custom alerts.

Assumption to check: Basic notifications for due tasks

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

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

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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
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Expo
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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.