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
Harbor Freight Tools
HARBOR FREIGHT COUPONS
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
230,467 ratings · Top 5%
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/
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 Harbor Freight Tools: map the core Shopping 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 product range and include regional availability filters.
Assumption to check: Limited product availability in certain regions
Validate with people who use this workflow before building.
Hypothesis 2
Implement more robust error handling and testing.
Assumption to check: Occasional app crashes during checkout
Validate with people who use this workflow before building.
Hypothesis 3
Optimize search algorithms and improve server response times.
Assumption to check: Slow search results
Validate with people who use this workflow before building.
Hypothesis 4
Enhance product descriptions and add videos for better customer engagement.
Assumption to check: Inadequate product descriptions and details
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
HARBOR FREIGHT COUPONS Find the latest coupons, instant savings, Inside Track Club member deals, and more with the Harbor Freight Tools app. SHOP Browse the latest tools, watch them in action with our Harbor Freight videos, check in-stock availability in your area, and create a wish list for your next in-store visit. You can also use the Barcode/QR scanner in-store to quickly learn more about our tools. ACCOUNT ACCESS Sign in to your Harbor Freight Tools account and sync your product wish list across different devices. INSIDE TRACK CLUB MEMBERS Stay up to date with all the latest Inside Track Club Member deals. Save your Inside Track Club deals to your wish list for your next in-store visit. ABOUT US Harbor Freight Tools is America's leading retailer of quality tools at the lowest prices. Harbor Freight carries over 7,000 products, specializing in air compressors, automotive tools, drills, generators, hand tools, saws, tool storage, welding supplies, wrenches, and more. Most Harbor Freight products are sourced directly from manufacturers and are all tested in our own quality assurance facility in the United States. Harbor Freight is known for our compellingly low prices on quality tools, all of which meet, or beat, the quality of the brand name competitors. Harbor Freight has over 1600+ stores nationwide. Our Harbor Freight Tools stores stock a full selection of hardware, tools, and accessories in categories including automotive, air and power tools, storage, outdoor power equipment, generators, welding supplies, shop equipment, hand tools, and more. All of Harbor Freight’s hand tools come with a lifetime warranty. Whatever you do, do it for less at Harbor Freight. FAQ Have questions or feedback? Email us at: [email protected]
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
React Native
Expo
Supabase
React Navigation
@supabase/supabase-js
Zustand
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.
