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
Flink - Daily Planner & To-Do
Flink is a beautifully minimal daily planner that helps you organize tasks and manage your schedule
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.5
22 ratings · Top 50%
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/
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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.
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 Flink - Daily Planner & 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
Implement advanced sorting and filtering options for tasks.
Assumption to check: Limited task organization features
Validate with people who use this workflow before building.
Hypothesis 2
Optimize app performance and resource management.
Assumption to check: Inconsistent performance on older devices
Validate with people who use this workflow before building.
Hypothesis 3
Add sharing and collaboration options for task management.
Assumption to check: Lack of collaboration features
Validate with people who use this workflow before building.
Hypothesis 4
Enhance the UI with modern design principles and customization options.
Assumption to check: Basic UI design
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
Flink is a beautifully minimal daily planner that helps you organize tasks and manage your schedule. No clutter, no distractions – just a clean space to plan your day. WHY FLINK? - Clean, E-ink inspired design that's easy on the eyes - Simple bullet-style task management - No ads, no complexity FEATURES - Daily Planner: Plan your day with a clear, timeline-based view. See what's ahead and stay on track. - Bullet Tasks: Create tasks quickly with bullet-style entries. Check them off as you go – simple and satisfying. - Search & Filter: Find any task instantly. Filter by date, status, or keyword. - Widgets: Add Flink widgets to your home screen for quick task overview without opening the app. - Recurring Tasks: Set daily, weekly, or monthly repeating tasks for habits and routines. MINIMAL BY DESIGN Flink embraces the beauty of simplicity. The E-ink style interface provides a calm, focused environment for planning. No flashy colors, no overwhelming features – just what you need to get things done. PERFECT FOR - Daily task management - Building productive routines - Bullet journal enthusiasts - Anyone who loves minimal design Start planning smarter with Flink. Questions? Contact us at [email protected]
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
React Native Paper
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.
