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.
Over 100,000 sessions tracked World Wide!
$5.99 · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Sauna & Cold Plunge Tracker: 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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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
Assumption to check: Limited integrations with health data sources like HealthKit
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of social features for sharing progress
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No subscription flexibility
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Minimal user customization options
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Over 100,000 sessions tracked World Wide! Sauna Tracker is the #1 App for Tracking Sauna Sessions, Cold Plunges, Hyperbaric Oxygen Therapy and Red Light Therapy sessions! Transform your Longevity routine with Sauna Tracker, the ultimate Sauna and Cold Plunge tracking app designed for Apple Watch and iPhone. Effortlessly monitor your Sauna Sessions, Cold plunge sessions, HBOT and Red Light Therapy sessions to unlock powerful insights with Sauna Benefit Zones, and achieve your Sauna and Cold Plunge wellness goals—all in one beautifully redesigned app. Features Sauna and Cold Plunge Lovers rave about! 1. Real-Time Heart Rate Tracking for Sauna and Cold Plunge Sessions - Monitor your heart rate live on your Apple Watch during every Sauna and Cold Plunge Session - Track calories burned and Sauna Benefit Zones (Warm-Up, Core Heat, Detox, HSP Release, Max Benefit) - Track calories burned and Cold Plunge Benefit Zones (Cold Shock, Adaptation, Metabolic Boost, Resilience, Cold Mastery) - Start sessions from iPhone or Apple Watch with automatic duration recording and background live activities - Track your Sauna and Cold Plunge session Goal with visual progress rings - Set Heart Rate alerts when your heart rate reaches a certain threshold while in the Sauna or Cold Plunge. 2. Revolutionary Sauna and Cold Plunge Benefit Zones - Real-time zone tracking shows exactly when you enter each benefit phase - Zone-colored heart rate charts reveal optimal sauna timing - Complete zone analysis shows which benefits you've unlocked - Personalized insights for maximizing each sauna session 3. Set Sauna and Cold Plunge Goals + Enhanced Analytics & Beautiful Stats - Redesigned stats view with interactive charts and weekly comparisons - Heart rate trends with zone-colored visualization over time - Weekly progress with week-over-week improvement tracking - Detailed session summaries with benefit zone completion status - Set your weekly Sauna and Cold Plunge goals directly from the dashboard. 4. Designed for Every Sauna and Cold Plunge Experience - Track Traditional, Infrared, Steam saunas worldwide + Hot Tub session tracking - Track Cold Plunge Sessions and Cold Showers - Full Celsius and Fahrenheit temperature support - Customize Session and Cold Plunge goals and track temperatures precisely - Tailored insights for every Sauna type and Cold Plunge 5. Sauna and Cold Plunge Tracking + Health and Fitness Tracking, Seamlessly Integrated - Sauna Tracker syncs with Apple Health, giving you a comprehensive wellness view - Sync workouts and heart rate data from Sauna Sessions with Apple Health and Activity App - Integrate with fitness goals - calories burned in Saunas count toward Activity Goals - Long-term tracking to measure progress and health improvements Private by Design Your health data and Sauna Session Data stays on your device, safe and secure. No accounts. No cloud storage. Total privacy, always. Built for Every Sauna Enthusiast Beginners: Easy-to-use with automatic Sauna Session Tracking and benefit zone guidance Regular Users: Monitor progress with enhanced stats and optimize routines with zone insights Advanced Users: Dive into detailed analytics with interactive charts and comprehensive health metrics Whether you're improving heart health, boosting recovery, or simply relaxing, Sauna Tracker with Benefit Zones ensures you get the most out of every session. Download now and elevate your sauna experience!
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.