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
Speed Tunes
Speed Tunes transforms your music into a natural riding cue by adjusting volume based on your speed
$2.99 · In-app purchases
PRICE
$2.99
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
Make this idea yours
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 included18 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 Speed Tunes: map the core Sports 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
Provide advanced insights and comparisons.
Assumption to check: Many sports apps lack detailed analytics.
Validate with people who use this workflow before building.
Hypothesis 2
Implement visual graphs for performance tracking.
Assumption to check: Users find it hard to track their progress over time.
Validate with people who use this workflow before building.
Hypothesis 3
Create a clear and straightforward paywall with trial options.
Assumption to check: In-app purchases can be confusing.
Validate with people who use this workflow before building.
Hypothesis 4
Add functionality to share achievements on social media.
Assumption to check: Limited social sharing features.
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
Speed Tunes transforms your music into a natural riding cue by adjusting volume based on your speed. Instead of disruptive voice alerts or constantly checking your speed, your music subtly responds to the way you ride. As you approach your target speed, the volume gradually increases. Ride within your chosen range and it stays consistent. Slow down or stop, and it fades back. The result is a smooth, unobtrusive way to stay aware of your pace while keeping your attention on the ride. Use GPS mode with Onewheels, electric skateboards, scooters, bikes, EUCs, and other PEVs. For compatible VESC boards, Speed Tunes also displays live telemetry including speed, duty cycle, battery percentage, voltage, and motor and MOSFET temperatures. Features * Speed-based music volume control * Custom target speed range * Subtle audio feedback through your music * Optional over-speed alerts * GPS mode for broad ride compatibility * Live telemetry for compatible VESC boards * Ride history and ride graphs * MPH and KPH support * Great for cruising, commuting, group rides, and performance riding Whether you’re cruising, commuting, riding with friends, or pushing your limits, Speed Tunes helps you feel your pace through your music, making every ride more intuitive and immersive. Current Vesc Controller Support: Thor 400, Thor 301, Lil Focer, working on further options. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://brandenlacour.github.io/speedtunes-privacy/
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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
Zustand
react-native-svg
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.
