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
Loadstone GPS
Loadstone GPS is a powerful, easy-to-use app that enables blind pedestrians to "go blindly where everyone sighted has gone before."
$10.99 · In-app purchases
PRICE
$10.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 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.
Build your own version
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 Loadstone GPS: 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
Implement offline maps and navigation.
Assumption to check: Limited offline functionality
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to customize map styles and navigation settings.
Assumption to check: Lack of customization options
Validate with people who use this workflow before building.
Hypothesis 3
Enhance TTS for clearer instructions and add multiple voice options.
Assumption to check: Voice navigation can be unclear
Validate with people who use this workflow before building.
Hypothesis 4
Simplify the in-app purchase process and make premium features more visible.
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
Loadstone GPS is a powerful, easy-to-use app that enables blind pedestrians to "go blindly where everyone sighted has gone before." It is designed by the blind, for the blind, specifically for those who use Voiceover. Features * Get turn-by-turn directions from any point or your current location to a desired destination. * Access and download from a world-wide database of points from OpenStreetMap, public mapping sources, transit systems, and points shared by other Loadstone users. * Create, store, and share your own navigation waypoints with others or the Loadstone comunity. * Filter point searches and output by categories and tags. * Explore your surroundings with features like 'Show Neighbourhood', 'Explore', and 'Find Point'. * Receive approach and arrival alerts for points of interest. * Customize alerts, units of measure, address format and other settings. * Display astronomic information like sunrise and set, moonrise and set, etc. * Track distance travelled with a built-in trip meter. * Import text databases and checkpoints from previous Loadstone versions. * No data plan required to use most major functions. * Complete documentation included. * Available in multiple languages. For the latest news, tutorials and more information please visit the Loadstone website at: https://www.loadstone-gps.com.
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
react-native-maps
@react-native-community/geolocation
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.
