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
Fantom ESC
Fantom Electronic Speed Control gives you complete wireless control of your boat’s kicker engine — from throttle management to automatic stow control — all through a simple and reliable mobile interface.
$29.99 · In-app purchases
PRICE
$29.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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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Combine features and design from your favorite apps.
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What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
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 Fantom ESC: map the core Business 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
Create a streamlined navigation with clear icons and labels.
Assumption to check: Users often find electronic signature apps cumbersome to navigate.
Validate with people who use this workflow before building.
Hypothesis 2
Provide advanced editing features and template options.
Assumption to check: Limited customization options for documents.
Validate with people who use this workflow before building.
Hypothesis 3
Optimize data fetching and caching strategies.
Assumption to check: Slow loading times when managing multiple documents.
Validate with people who use this workflow before building.
Hypothesis 4
Implement an in-app help center and responsive support.
Assumption to check: Poor customer support and documentation.
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
Fantom Electronic Speed Control gives you complete wireless control of your boat’s kicker engine — from throttle management to automatic stow control — all through a simple and reliable mobile interface. Whether you’re manually adjusting your throttle or setting an automatic cruising speed, Fantom ESC makes boat control safer, smarter, and more convenient. Key Features Manual Mode Set throttle position precisely (1–250 setpoints). Use the Run button to move the servo to the target throttle. Fine-tune throttle with + / – buttons. Use Max Throttle for temporary full-speed control, automatically reverting back when released. Toggle between day/night display for visibility. Lock the screen to avoid accidental inputs. Auto Mode Set your desired GPS speed and let the system automatically adjust throttle — just like cruise control for your boat. Auto mode ensures smooth, steady performance based on real-time GPS data. When switching between Manual and Auto, the servo automatically returns to idle for safety. Stow Control • Automatically stow (trim up) your kicker engine at a preset speed (e.g., 3 mph). Instantly stow the engine manually with one tap — engine stops, motor trims up, and alarm activates. Configuration Page Adjust servo movement speed and behavior to your preference. Factory default settings: 15, 12, 0. Guest Mode (coming soon) Securely add authorized users to operate the app with credentials you provide. Safety First Automatic idle when the engine is stowed. Screen lock prevents accidental touches. Idle reset when switching between modes. With Fantom Electronic Speed Control, you’re always in command of your kicker — precisely, safely, and effortlessly.
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
Firebase
Redux
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.
