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
Steam Tables
The "Steam Tables" app is the #1 selling app for quickly calculating saturated and superheated steam properties
$5.99 · In-app purchases
PRICE
$5.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
4 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 included17 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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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 Steam Tables: map the core Business 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
Add validation messages and loading indicators when calculating.
Assumption to check: Limited user feedback on data entry
Validate with people who use this workflow before building.
Hypothesis 2
Implement a clearer navigation structure with visual cues.
Assumption to check: Navigation can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Include tooltips or help sections for each property in the tables.
Assumption to check: Lack of detailed explanation for properties
Validate with people who use this workflow before building.
Hypothesis 4
Optimize table rendering and data fetching for better performance.
Assumption to check: Performance issues with large data sets
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
The "Steam Tables" app is the #1 selling app for quickly calculating saturated and superheated steam properties. This app is a universal app that works on both the iPhone and iPad and adjusts its screen size accordingly. Bonus: The Steam Tables app now includes our popular HVAC Equipment Locator app built right in! Click here for details about that app: http://bit.ly/1yTq539 Come see why 400,000+ of users world-wide have chosen our app over the competition: 1.We offer the largest combination of input parameters over all competitive apps, including: For saturated steam: Temperature and quality Temperature and enthalpy Temperature and specific volume Temperature and entropy Pressure and quality Pressure and enthalpy Pressure and spec. volume Pressure and entropy For superheated steam: Temperature and pressure Temperature and enthalpy Temperature and spec. volume Temperature and entropy Pressure and enthalpy Pressure and spec. volume Pressure and entropy 2. We display a wide range of results (see the screenshots below for a sample). 3. Using the slider controls, you can instantly view results as you update the input parameter values by moving the slider indicator. Also, you can increment/decrement by specific values for each parameter type. You can manually input exact values if so desired, too. 4. This app is not just a steam-table lookup app. It is powered by the actual steam-table formulas, so you can calculate for all ranges of input values, not just those published in steam table books. 5. All values can be displayed in both English (IP) or Metric (SI) units. Also, you can choose to display different types of units for specific parameter types such as pressure and temperature. 6. We offer comprehensive support and regular updates based upon feedback from existing users. We've been around for 15 years and plan on being around for much longer, so you can be assured that this and all of our apps will continue to be supported and updated. We also offer the following additional applications for the iPhone/iPad: 1. HVAC Duct Sizer 2. HVAC Pipe Sizer – Gas Low Pressure 3. HVAC Pipe Sizer - Gas High Pressure 4. HVAC Pipe Sizer – Liquid 5. HVAC Pipe Sizer – Steam 6. Steam Tables 7. Psychrometric Plus 8. Psychrometric LT 9. HVAC Pipe Sizer Plus 10. HVAC Pipe Sizer Gas Plus 11. HVAC Toolkit 12. HVAC Toolkit Ultimate 13. HVAC Residential Load Calcs 14. HVAC Load Plus 15. HVAC Equipment Locator 16. ASHRAE Duct Fitting Database 17. ASHRAE 62.1 Ventilation Load Calcs 18. HVAC Psych HD 19. HVAC ResLoad-J 20. HVAC Residential Load Calcs HD
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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
Supabase
react-navigation
@supabase/supabase-js
react-native-paper
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.
