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
Texas Historical Marker Guide
Texas is home to over 16,000 historical markers
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.5
800 ratings · Top 15%
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 Texas Historical Marker Guide: map the core Travel 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
Implement offline caching for markers and details
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to add and review markers
Assumption to check: Lack of user-generated content
Validate with people who use this workflow before building.
Hypothesis 3
Enhance navigation with clearer labeling and onboarding
Assumption to check: Navigation can be confusing
Validate with people who use this workflow before building.
Hypothesis 4
Simplify subscription options and provide clear benefits
Assumption to check: In-app purchase confusion
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
Texas is home to over 16,000 historical markers. And now there's an app to help you find them! Features: -Onboard marker database means you can browse markers without an Internet connection. -Browse markers by geographic locations including cities and counties. -Browse markers by governing agencies; manufacturers; and topics. -Browse attractions where markers can be found including museums; cemeteries; state parks; historic districts; etc. -Uses Location Services in the background (optionally) and notifies you when you enter a different Texas county! (Continuous use of GPS may reduce battery life.) -Keep track of marker visits! -Update marker coordinates! (Device with GPS radio required) -Record marker conditions! -Includes conditions of marker where reported. -Includes text for many markers with more being added frequently. -Link marker records to existing pictures from your Photo Library! (Photos not included with app.) -Share your favorite markers via Mail, and iMessage! -Backup your user database to your computer using iTunes File Sharing. Backed up data includes: Markers you’ve checked in at; marker coordinates you’ve captured; favorite markers; flagged markers; shared markers; and markers you’ve browsed in the database. Includes: -Texas Centennial markers and monuments erected in 1936! -Old San Antonio Road markers erected by DAR and the State of Texas in 1918! -San Jacinto Battleground markers erected by DRT and the State of Texas in 1912! -Complete Texas works of Pompeo Coppini! -Selected Texas works of Waldine Tauch, Frank Teich, Elisabet Ney, and others! -Selected DAR bronze plaques! -Blue Star Memorial markers (all the ones we know about.) -New markers erected since 2012!
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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
react-navigation
axios
react-native-maps
react-native-image-gallery
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.
