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
ThermoTimer
take control of your hot & cold therapy
$4.99 · In-app purchases
PRICE
$4.99
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
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A product spec, screen plans, and build steps for your coding agent.
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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 ThermoTimer: 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
Include customizable workout templates.
Assumption to check: Limited exercise tracking options
Validate with people who use this workflow before building.
Hypothesis 2
Add social sharing for workouts and challenges.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 3
Implement a history log to view past workouts.
Assumption to check: No progress tracking
Validate with people who use this workflow before building.
Hypothesis 4
Provide customizable audio alerts for timers.
Assumption to check: Missing audio cues
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 control of your hot & cold therapy thermotimer is the ultimate timing companion for sauna lovers, cold-plunge enthusiasts, and anyone practicing contrast therapy. whether you’re just getting started or following advanced protocols like the wim hof method, thermotimer keeps every session precise, safe, and effortless. 6 guided therapy protocols choose from expertly designed routines—perfect for recovery, wellness, stress reduction, and building resilience: beginner – a gentle intro to heat & cold therapy wim hof method – short cold cycles with extended heat recovery finnish sauna – classic nordic-style timing contrast therapy – switch smoothly between hot and cold quick recovery – a fast routine for busy days cold focused – ideal for ice bath and cold plunge training each protocol includes clear phase transitions, visual cues, and optional audio alerts. built for real sauna conditions thermotimer is designed to perform flawlessly in hot, humid, or low-light environments: large, high-contrast timer visible through steam dim mode to keep screens discreet in dark saunas tap-friendly controls — no tiny buttons live activities keeps your timer on the lock screen works 100% offline for remote cabins or spa settings apple watch integration leave your phone outside the heat. start, pause, skip phases, and view progress directly from your wrist. perfect for saunas, cold tubs, and recovery sessions. track your progress stay consistent and see your improvement over time: full session history time spent in hot & cold phases streak tracking session export for coaches or wellness logs three beautiful themes match your environment and personal style: sauna glow – warm amber hues dark minimal – clean, oled-friendly black light clean – high contrast for outdoor cold plunging clear audio & haptic alerts never miss a phase transition again. choose from subtle countdown beeps, phase-complete sounds, or gentle haptics. no account. no ads. no subscriptions. just a powerful, beautifully designed thermal therapy timer—always ready when you are. perfect for sauna users & cold plunge fans contrast therapy routines recovery athletes breathwork & resilience training wellness spas & at-home sauna setups wim hof method practitioners transform your heat & cold routine with precision.
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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
react-navigation
expo-av
shadcn/ui
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.
