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
Sweaty Hat - Breath Coach
Sweaty Hat - Breath helps you practice structured breathing rounds with a simple, focused timer on iPhone and Apple Watch.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 Sweaty Hat - Breath Coach: map the core Health & Fitness 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 wider range of breathing exercises and techniques.
Assumption to check: Limited variety of exercises
Validate with people who use this workflow before building.
Hypothesis 2
Integrate social challenges and sharing options.
Assumption to check: No social features
Validate with people who use this workflow before building.
Hypothesis 3
Provide personalized coaching based on user progress and feedback.
Assumption to check: Lack of personal coaching
Validate with people who use this workflow before building.
Hypothesis 4
Integrate with HealthKit or Google Fit for better tracking.
Assumption to check: No integration with health apps
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
Sweaty Hat - Breath helps you practice structured breathing rounds with a simple, focused timer on iPhone and Apple Watch. Set your breath pace, choose breaths per round and number of rounds, then follow clear on-screen cues with optional haptics to stay in rhythm. During breath holds and recovery, the timer keeps things straightforward and easy to follow. What you can do • Guided breathing rounds (Inhale/Exhale) with an on-screen countdown • Timed breath holds with a simple “tap when you breathe” control • Recovery holds between rounds (no recovery after the final round) • Apple Watch support with haptic cues (In = 1 tap, Out = 2 taps, Hold = 3 taps) • Session-length estimate that updates as you adjust settings (so you know what to expect) • Clean session summary with your breath-hold times per round Designed to be calm Sweaty Hat - Breath is intentionally minimal—easy to start, easy to pause, and easy to resume. Note Sweaty Hat - Breath is a breathing timer for general wellness and practice. It is not a medical device and does not provide medical advice.
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
Victory Native
React Navigation
Expo Notifications
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.
