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
CellMapper
Cellular Tower & Signal Finder is the ultimate solution to track and locate nearby cell towers on an interactive map
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.0
549 ratings · Top 30%
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 CellMapper: 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 a more intuitive way to calibrate signal strength readings.
Assumption to check: Users report difficulty in accurately mapping signal strength.
Validate with people who use this workflow before building.
Hypothesis 2
Enhance offline map capabilities and data caching.
Assumption to check: Limited offline functionality.
Validate with people who use this workflow before building.
Hypothesis 3
Streamline UI to reduce clutter and enhance map readability.
Assumption to check: Navigation can be confusing with multiple layers of data.
Validate with people who use this workflow before building.
Hypothesis 4
Optimize data fetching and rendering for improved performance.
Assumption to check: Slow loading times for large datasets.
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
Cellular Tower & Signal Finder is the ultimate solution to track and locate nearby cell towers on an interactive map. Whether you're looking to boost your mobile signal or simply curious about network coverage in your area, this app provides accurate details of 5G, 4G, 3G, and 2G towers. Key Features: Real-Time Tower Locations: View nearby cell towers for all major network types, including 5G, 4G, 3G, and 2G. Detailed Tower Information: Access detailed information like tower ID, signal strength, area, and network provider. Map Integration: Seamlessly locate towers on a live map with an intuitive interface. Explore network coverage on map with Cellular Tower & Signal Finder today! Note- Premium Subscription is required to use advanced features such as tower details and filter. Privacy: https://celltower.bravycode.com/privacy.html Terms: https://celltower.bravycode.com/terms.html
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-query
react-native-maps
@react-navigation/native
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.
