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
Two Hearts - Habit tracker
*Inspired by the Never Miss Twice philosophy from Atomic Habits.
$1.99 · In-app purchases
PRICE
$1.99
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 included15 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 Two Hearts - Habit tracker: map the core Lifestyle 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 customizable reminders and notifications for each habit.
Assumption to check: Inconsistent habit tracking due to lack of reminders
Validate with people who use this workflow before building.
Hypothesis 2
Provide detailed statistics and visualizations of habit performance.
Assumption to check: Limited analytics and insights on progress
Validate with people who use this workflow before building.
Hypothesis 3
Add social sharing and community engagement features for users.
Assumption to check: No community or social features to motivate users
Validate with people who use this workflow before building.
Hypothesis 4
Offer a more flexible pricing model or limited free version to attract more users.
Assumption to check: Subscription model may deter users
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
*Inspired by the Never Miss Twice philosophy from Atomic Habits. Build consistency without chasing perfection. Most habit apps expect you to be perfect. Miss a day and your streak is gone. Two Hearts is built around a simpler idea: Don't miss twice. You start with two hearts. Miss a day and lose one. Miss again before getting back on track and you break your streak. Life happens. The goal isn't perfection—it's returning. Features The Two Hearts System: A gentler alternative to traditional streaks Designed for real life, not perfect days Focus on consistency over guilt Zoom from Day to Year: Track your progress across weekly, monthly, and yearly views See patterns instead of obsessing over individual days Watch consistency compound over time Home Screen Widgets: Check your status without opening the app See remaining hearts, streaks, and progress at a glance Quick reminders to stay on track 100% Private: No accounts No sign-ups No cloud sync No data collection Everything stays on your device. One Habit. One Focus. No endless habit lists No complicated setup No productivity theater Choose what matters most and show up consistently. Why Two Hearts? Most habit trackers are designed around streaks. Two Hearts is designed around recovery. Because success isn't never missing. It's coming back before a missed day becomes a missed week.
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
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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.
