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
ScanMaster for ELM327 OBD-2
ScanMaster is an application for vehicle diagnostics to OBD-2 standards, communicates with an OBD2 / OBDII / ELM car interface device
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
154 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 included16 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 ScanMaster for ELM327 OBD-2: 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
Expand compatibility to include more vehicle models.
Assumption to check: Limited vehicle compatibility with ELM327 devices
Validate with people who use this workflow before building.
Hypothesis 2
Implement a more subtle notification for premium features.
Assumption to check: In-app purchase prompts may be intrusive
Validate with people who use this workflow before building.
Hypothesis 3
Improve connection stability and troubleshooting guidance.
Assumption to check: Connection issues with ELM327 devices
Validate with people who use this workflow before building.
Hypothesis 4
Provide a guided onboarding experience that explains key features.
Assumption to check: User interface could be confusing for new users
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
ScanMaster is an application for vehicle diagnostics to OBD-2 standards, communicates with an OBD2 / OBDII / ELM car interface device How to use: 1. Plug ELM327 WIFI Scanner into vehicle's OBD2 port. (Port is usually found on the driver side dashboard under the steering wheel.) 2. Turn ON ignition. (This is one step before engine is powered.) 3. Launch your ScanMaster App. Click "Settings" for scan list OBD2 device and select correct your OBD device for diagnostics. (default is 192.168.0.10 or 192.168.0.123) We would greatly appreciate the feedback on the app. Please send us an email about your experiences, opinions or suggestions.
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
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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.
