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
Protected Left
Protected Left helps you drive safer by finding routes that avoid unprotected left turns — one of the most common causes of intersection accidents.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 included15 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 Protected Left: map the core Navigation 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
Offer offline maps and routes feature.
Assumption to check: Limited offline functionality in navigation apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement real-time traffic updates and alternative route suggestions.
Assumption to check: Difficulty in accurately predicting traffic conditions.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance voice guidance and TTS features for better user experience.
Assumption to check: Poor integration with voice navigation systems.
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the process to save and categorize favorite routes.
Assumption to check: Complexity in saving and managing favorite places.
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
Protected Left helps you drive safer by finding routes that avoid unprotected left turns — one of the most common causes of intersection accidents. Enter your destination and Protected Left instantly analyzes multiple route options, ranking them by safety. Each route shows exactly how many unprotected left turns it contains, so you can make an informed choice between the safest path and the fastest one. KEY FEATURES - Protected Route Planning: Automatically finds routes that minimize or eliminate unprotected left turns - Smart Route Comparison: See safest, balanced, and fastest options side by side with clear safety ratings - Turn-by-Turn Navigation: Full voice-guided directions with real-time alerts for upcoming turns - Protected Turn Alerts: Know in advance whether each left turn on your route has a protected signal - Real-Time Traffic: Routes adapt to current traffic conditions for accurate ETAs - Multi-Stop Trips: Plan routes with up to 3 waypoints, all optimized for safety - Saved Places: Quick access to home, work, and favorite destinations - Voice Guidance: Customizable audio directions so you can keep your eyes on the road Whether you're a new driver building confidence, a parent teaching a teen to drive, or anyone who wants to reduce intersection risk, Protected Left gives you peace of mind on every trip.
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
react-navigation
react-native-maps
axios
expo-location
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.
