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
R-Log
HVACR-log was created to help technicians comply with the latest EPA Section 608 reporting requirements without the hassle of doing extra paperwork
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
11 ratings · Top 30%
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 R-Log: 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
Introduce a more intuitive category selection interface with frequently used categories.
Assumption to check: Users find it hard to categorize expenses easily
Validate with people who use this workflow before building.
Hypothesis 2
Add more visualization options like line graphs and customizable date ranges.
Assumption to check: Limited reporting features
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate a help section with FAQs and contact options.
Assumption to check: Lack of user support features
Validate with people who use this workflow before building.
Hypothesis 4
Enable data export functionality to CSV or PDF for better user control.
Assumption to check: No option to export data
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
HVACR-log was created to help technicians comply with the latest EPA Section 608 reporting requirements without the hassle of doing extra paperwork. This digital record keeping log will become an integral part of your business in no time! With the changing of federal regulations regarding refrigerant usage, storage, and recovery, it has become necessary to keep track or log your activities to remain in compliance with the law. Systems that contain between 5 and 50 pounds have been the main target of this requirement. Information such as company name, date of recovery, type of refrigerant recovered, quantity of refrigerant recovered, etc., are now required to be logged and reported. This will create a lot of extra work (and paperwork!) for technicians and contractors that are already very busy. This is where the R-Log app can save you time and money, as well as help you meet your federal reporting requirements. The app is easy to use, just fill in required fields when you are on the job.
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.
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BUILD KIT DIFFICULTY
Starter
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.
