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
Hormetic
Hormetic tracks how your body responds to heat exposure, using heart rate and a temperature you enter, with honest math and full transparency.
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included14 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 Hormetic: 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.
Preview ready. Verify your email to reveal and copy the full prompt.
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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 support for Apple Watch and fitness trackers.
Assumption to check: Limited integration with wearable devices.
Validate with people who use this workflow before building.
Hypothesis 2
Implement social challenges and sharing options.
Assumption to check: Lack of community features for user engagement.
Validate with people who use this workflow before building.
Hypothesis 3
Provide more detailed performance analysis and recommendations.
Assumption to check: Limited insights and analytics for users.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce automated logging through device sensors.
Assumption to check: Manual logging can be tedious.
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
Hormetic tracks how your body responds to heat exposure, using heart rate and a temperature you enter, with honest math and full transparency. WHAT YOU GET - Heart-rate tracking during a session, recorded as a standard HealthKit workout - Three-zone classification with color-coded badges (Zone 1, Zone 2, Zone 3) - An estimated heat-dose score from your heart rate, the temperature you enter, and session duration - Per-session detail: peak heart rate, time in each zone, calories, algorithm version - Full session history HONEST BY DESIGN - Every value the algorithm derives is labeled "Estimated" - The algorithm is versioned independently from the app; each session records the version that produced its values - Historical sessions are never silently recomputed - Grounded in published research on heat acclimation and cardiovascular conditioning PRIVATE BY ARCHITECTURE Your data never leaves your device. No account. No analytics. No telemetry. No third-party SDKs. We do not sell personal information. IMPORTANT Hormetic does not require you to place your Apple Watch or iPhone in any hot environment. The temperature is a value you enter manually. Always keep your devices within their published operating temperature ranges (0–35°C / 32–95°F), and consult a healthcare professional before starting new heat-exposure activities. REQUIREMENTS iPhone running iOS 18 or later. Apple Watch optional, used for heart rate.
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
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Zustand
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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.
