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
TariffTorcher
The average U.S
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.7
3 ratings · Top 50%
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 TariffTorcher: map the core Finance 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 features like budget tracking and notifications for billing.
Assumption to check: Limited features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify navigation to make it more user-friendly.
Assumption to check: Complex navigation structure
Validate with people who use this workflow before building.
Hypothesis 3
Provide detailed reports on spending trends and savings.
Assumption to check: Lack of analytics tools
Validate with people who use this workflow before building.
Hypothesis 4
Optimize app performance and loading times.
Assumption to check: Inconsistent performance
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 average U.S. household pays about $2,000 a year in tariffs — the import tax baked into the price of most things brought in from abroad. Stores pass it on. You pay at the register, usually without knowing how much. TariffTorcher shows you the real number. Three steps: Scan a barcode or type the UPC. Confirm the country where the product was made. See the tariff built into the price, the effective rate, and the post-tariff total. What's inside: Live tariff calculation against the current U.S. Harmonized Tariff Schedule (HTS), maintained by the U.S. International Trade Commission Automatic country-of-origin detection from product databases and barcode region — overridable with one tap Editable price for when auto-filled retailer listings don't match what you paid Direct catalog search at Trader Joe's, Costco, Safeway, and Raley's Saved scans with per-product price history that builds up over time Share any result as a branded image Plain-language explanations of every term — tariff rate, HTS, country of origin What's not inside: No ads. No tracking. No subscription. No account required. Your scans stay on your phone. Built by Left Coast Media Corporation.
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
TypeScript
Axios
React Navigation
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.
