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
Bizer Navigator
Navigate Lake Winnipesaukee with Confidence
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.9
18 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 included16 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 Bizer Navigator: 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 maps and saved routes for better user experience.
Assumption to check: Limited offline functionality and navigation.
Validate with people who use this workflow before building.
Hypothesis 2
Incorporate a verified user badge system to enhance trust.
Assumption to check: User reviews can be sparse and unreliable.
Validate with people who use this workflow before building.
Hypothesis 3
Introduce advanced filtering options and a better sorting mechanism.
Assumption to check: Difficulty in finding specific listings without clear filters.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear descriptions of in-app features and their benefits.
Assumption to check: In-app purchases may not be clearly explained.
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
Navigate Lake Winnipesaukee with Confidence A navigation app for your mobile device that uses the most detailed and trusted map of Lake Winnipesaukee: the Bizer map, combined with the GPS and navigation features of today's hand held devices. Comprehensive Map Bizer's map of Lake Winnipesaukee provides a detailed and easy to read depiction of the islands, rock hazards, buoy system and common navigation routes. Navigation Assistance and Routing Let the Bizer Navigator suggest multiple routes to any destination on Lake Winnipesauke including highlighting of areas that require cautious navigation. Follow your position against a navigation route with directional aids as will as estimations of your arrival time based on your course, speed and heading. Location Tracking See where you are on the lake at all times with intelligent tracking which will orient the map according to your speed and course while underway. Points of Interest Boating on the lake just got smarter. You can now search and navigate directly to key destinations across Lake Winnipesaukee, including: marinas, lakeside restaurants, gas docks, popular sandbars, coves, islands and more.
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
Axios
React Native Maps
Async Storage
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.
