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
Sauna Record
Use your Apple Watch to record your sauna.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 1.0
1 ratings · Below Average
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included18 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 Sauna Record: 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 clear navigation and accessibility features.
Assumption to check: Poor user experience with navigation and accessibility
Validate with people who use this workflow before building.
Hypothesis 2
Add progress charts and insights for sauna usage.
Assumption to check: Lack of detailed analytics for sessions
Validate with people who use this workflow before building.
Hypothesis 3
Introduce social sharing and challenges.
Assumption to check: Limited social features
Validate with people who use this workflow before building.
Hypothesis 4
Enhance premium features and promote them effectively.
Assumption to check: Inadequate monetization strategy
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
Use your Apple Watch to record your sauna. Sauna Record records the time and heart rate for each set of sauna, water bath, and rest, and the estimated sweat volume in the sauna. By entering a sauna based on time and heart rate, you can enter a sauna in a healthy way. A pleasant sauna, water bath, and rest vary depending on the facility, season, and your own condition. The sauna record is used to record the time and heart rate, and finally, the temperature of the sauna room, the temperature of the water bath, the temperature of the outside air, and whether there is a wax or aufguss, etc. are entered. By looking at the recorded information, you will know what kind of sauna and how to enter the sauna is best for you and how to get closer to a better body condition. The following functions are available. Record the time and heart rate of each sauna, water bath, and rest. Save heart rate data to health care Heart rate graphing Sauna activity calendar Vibration notification function for the set time. A function that vibrates to notify the user according to the set heart rate A function that calculates the estimated amount of perspiration based on the set perspiration rate. A function to check the record of all past saunas entered by year, month, and day. Record the facilities and notes of saunas you have entered. Register your favorite saunas. Record whether or not you have been to a sauna with or without a löyly or aufguss. Record your evaluation of each sauna. Record the temperature of each sauna. Record your weight and blood pressure. BMI measurement based on height Record backup function Measured records can be viewed on the iPhone. Records can also be shared as images or text. We hope this application will contribute to the hot bath industry. Notes This app integrates with the HealthKit health app and uses heart rate data. The values in the app are for reference only. Please enjoy the sauna with your physical condition first. Please wear a non-metallic belt, cover the sauna with your hand, or apply a cold towel with water to prevent the AppleWatch from getting hot. Please use Apple Watch in the recommended environment.
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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
Redux
React Navigation
Axios
Firebase
BUILD KIT DIFFICULTY
Advanced
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.
