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
Apnio
Apnio is your personal freediving and apnea training companion, designed for beginners and experienced freedivers alike.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
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Combine features and design from your favorite apps.
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Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 Apnio: 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
Implement gamification elements to increase user engagement
Assumption to check: Many health apps lack engaging user experience
Validate with people who use this workflow before building.
Hypothesis 2
Provide clear visualizations for sleep patterns and improvements
Assumption to check: Difficulty in tracking progress over time
Validate with people who use this workflow before building.
Hypothesis 3
Automate data logging using device sensors for more reliability
Assumption to check: Inconsistent data logging
Validate with people who use this workflow before building.
Hypothesis 4
Enhance user support with rich content, FAQs, and tutorials
Assumption to check: Limited customer support and resources
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
Apnio is your personal freediving and apnea training companion, designed for beginners and experienced freedivers alike. SCIENTIFIC TRAINING METHODS Train with proven techniques used by professional freedivers: • O2 Tables — Build oxygen tolerance with progressive breath-hold intervals • CO2 Tables — Increase CO2 tolerance with fixed holds and decreasing rest • Breath Holding Test — Track and improve your personal best breath-hold time • Square Breathing — Box breathing exercises for relaxation and focus PERSONALIZED TRAINING PLANS Get custom training plans tailored to your skill level and goals. Apnio adapts to your progress so you improve at your own pace — whether you're just starting out or preparing for competitive freediving. DRY & POOL MODES Switch between Dry mode for training at home and Pool mode for water sessions. Pool mode enables Water Lock on Apple Watch to prevent accidental touches underwater. APPLE WATCH COMPANION Train directly from your wrist without your phone. The Apple Watch app provides: • Full training controls and real-time countdown timers • Heart rate monitoring during breath holds • Haptic feedback for phase transitions • Water Lock support for pool sessions TRACK YOUR PROGRESS • View detailed session history with times, rounds, and heart rate data • Weekly performance analytics and progress charts • Personal best tracking for breath-hold tests • Share training results with beautiful shareable cards HEART RATE MONITORING Monitor your heart rate in real-time during training sessions. See average and max BPM for each session, and track how your body adapts over time. APPLE HEALTH INTEGRATION Sync your training sessions and heart rate data to Apple Health for a complete view of your fitness journey. FEATURES • 4 scientifically-backed training modes • Personalized weekly training plans • Real-time heart rate monitoring • Apple Watch companion app • Dry and Pool training modes • Detailed session history and analytics • Progress tracking with charts • Shareable training result cards • Custom training tables • Audio and haptic coaching cues Start your freediving journey today with Apnio. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://apnio.health/privacy-policy
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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
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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.
