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
Calm Arcade – Relaxing Games
Take a deep breath
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
7 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.
Build your own version
Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included16 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 Calm Arcade – Relaxing Games: 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
Add a larger library of games and regular updates.
Assumption to check: Limited game variety can lead to user boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Include a one-time purchase option for full game access.
Assumption to check: Subscription model may deter casual users.
Validate with people who use this workflow before building.
Hypothesis 3
Implement a more visual progress tracker with achievements.
Assumption to check: Difficulty in tracking progress can frustrate users.
Validate with people who use this workflow before building.
Hypothesis 4
Ensure prompts are well-timed and non-disruptive.
Assumption to check: In-app purchase prompts can be intrusive.
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
Take a deep breath. Calm Arcade is your pocket-sized escape to a peaceful mind. Unwind with a beautifully designed collection of relaxing, satisfying, and stress-relieving mini games — each created to help you slow down, focus, and enjoy a moment of calm. Whether you need a break, want to reset your mood, or simply enjoy soothing visuals, Calm Arcade gives you instant peace with just a tap. Why people love Calm Arcade • Dozens of calming mini games • Aesthetic designs & soft pastel colors • Satisfying touch interactions • Gentle sounds and ambient audio • Zero stress, no timers, no pressure • Play for 10 seconds or 10 minutes • Perfect for anxiety, focus, and relaxation Every game is simple, soothing, and designed to make you feel good. A new kind of relaxing arcade Explore a world of sensory and ASMR-style experiences: • Water ripple simulations • Sand flow and soft particles • Light waves & glow lines • Cloud painting • Floating fireflies • Leaf drift & snow fall • Zen garden brushing • Quiet geometric patterns • Soothing color fades • Ambient bokeh lights …and so much more. Each mini game is handcrafted to calm your mind and spark joy. Relaxing soundscapes included Enhance your calm with a full library of quiet audio: • Lofi beats • Rain & ocean • Forest ambience • Soft wind • Night sounds • Calm pulses Customize the volume, mix sounds, and create your perfect relaxing mood. No pressure. No timers. No fail states. Calm Arcade is built to help you slow down, breathe, and unwind. Open it anytime for a peaceful reset. Remove ads once — stay calm forever A single optional purchase removes all ads permanently. Made with care to help you feel better Whether you’re stressed, anxious, bored, or just want something beautiful to play, Calm Arcade gives you a peaceful moment whenever you need it. Download today and start your calm journey.
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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
React Native
Expo
Zustand
Supabase
react-navigation
@supabase/supabase-js
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.
