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
FlatWrench
Built for flat-rate techs who want to beat the clock.
$3.99 · In-app purchases
PRICE
$3.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.0
2 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 FlatWrench: map the core Productivity 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
Incorporate gamification elements to encourage usage.
Assumption to check: Lack of user engagement features
Validate with people who use this workflow before building.
Hypothesis 2
Create a combined view for users to see jobs and expenses side by side.
Assumption to check: Difficult to track expenses and jobs simultaneously
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to customize job categories and expense types.
Assumption to check: Limited customization options
Validate with people who use this workflow before building.
Hypothesis 4
Implement notification reminders for upcoming job deadlines and expenses.
Assumption to check: No reminders for deadlines
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
Built for flat-rate techs who want to beat the clock. FlatWrench is the essential productivity app for automotive technicians working on flat-rate pay. Stop guessing and start knowing exactly how efficient you are with every job. HOW IT WORKS Enter your flagged hours for each job, and the app automatically calculates your efficiency against an 8-hour workday. See your productivity percentage instantly and track your performance over time. KEY FEATU RES - Track flagged hours for every job - Automatic efficiency calculation based on 8-hour days - View metrics by pay period (1st-15th and 16th-end of month) - Complete job history with easy search - Dark theme designed for shop use - Large touch targets for gloved hands - Secure cloud sync across devices WHY FlatWrench? Most technicians have no idea if they're actually making money until payday. FlatWrench gives you real-time visibility into your productivity, so you can make adjustments before it's too late. SIMPLE PRICING One-time purchase of $3.99. No subscriptions, no hidden fees.
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.
