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
On Top To-Do
Have you always wanted to be a "list person" but never been able to make the habit stick? Do existing systems for managing time and getting things done seem great, but not match the way you think and organize? Have yo...
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
10 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 included18 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
Preview a sample Build Kit No email needed
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 On Top To-Do: 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
Allow users to customize themes and task views.
Assumption to check: Limited customization options for tasks and projects
Validate with people who use this workflow before building.
Hypothesis 2
Introduce project sharing and team collaboration tools.
Assumption to check: No built-in collaboration features
Validate with people who use this workflow before building.
Hypothesis 3
Implement customizable reminders and notifications for tasks.
Assumption to check: Lack of reminders and notifications
Validate with people who use this workflow before building.
Hypothesis 4
Add offline mode for task management without internet.
Assumption to check: No offline functionality
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
Have you always wanted to be a "list person" but never been able to make the habit stick? Do existing systems for managing time and getting things done seem great, but not match the way you think and organize? Have you tried and failed repeatedly to organize life and work with planners, bullet journals, and complex workflow apps? On Top will make YOU into a "list person" with its minimalist design and intuitive swipe method for organizing and prioritizing. On Top is THE master to do list app for the messy, disorganized, and procrastinators among us. There's just one list for EVERYTHING. Move every single thing you need to do, buy, or remember from your brain into On Top. When it's time, swipe right and the tasks will go to the top (and stay at the top) where they'll be highlighted in a color of your choosing. At the grocery store? Swipe right on all the groceries. Just get to your desk for the workday? Swipe right on all the tasks you intend to tackle this day.
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/native
react-native-reanimated
BUILD KIT DIFFICULTY
Starter
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.
