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
Speedometer»
Speedometer» is a super-large, simple speed display for your iPhone, iPad, and Apple Watch.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
50,018 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.
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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 included14 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 Speedometer»: 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 battery-saving mode that updates speed less frequently.
Assumption to check: App may drain battery quickly due to constant GPS usage.
Validate with people who use this workflow before building.
Hypothesis 2
Allow users to set custom alert thresholds and sounds.
Assumption to check: Limited customization for speed alerts.
Validate with people who use this workflow before building.
Hypothesis 3
Provide offline map and speed tracking capabilities.
Assumption to check: No offline functionality.
Validate with people who use this workflow before building.
Hypothesis 4
Add gamification elements or challenges for users.
Assumption to check: Lack of user engagement 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
Speedometer» is a super-large, simple speed display for your iPhone, iPad, and Apple Watch. There is no account to create and no login. Download the app, open it, and see your speed in seconds. SPEED AT A GLANCE • Extra-large, high-contrast GPS speed display • mph, km/h, and knots • Clear GPS signal feedback • Helpful trip details such as distance, time, direction, and elevation MORE WHEN YOU WANT IT • Record trips and review where you went • Use HUD mode for windshield viewing • See live information on the Lock Screen and Dynamic Island • Check your speed and record trips from Apple Watch • Personalize the display to suit your drive, ride, run, or time on the water OPTIONAL SPEEDOMETER PRO Unlock more ways to personalize, review, and use Speedometer»: • Unlimited track history and detailed trip insights • Route maps, charts, and additional history views • Track import, export, and mileage reports • Configurable speed alerts • Night and custom themes • Home Screen widgets and expanded Live Activity details • Remove banner ads Choose a yearly subscription with a 3-day free trial or a one-time Lifetime purchase. The simple speedometer remains available without Pro. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel subscriptions in your Apple ID settings. YOUR TRIPS STAY YOURS Your trip and location history is saved locally on your device and is not sent to our servers. It may be included in your own encrypted device backups. ACCURACY AND SAFETY Speedometer» is provided as is. Speed, distance, direction, elevation, and related values are estimates based on your device's GPS, motion sensors, signal quality, and other hardware. Results can be delayed, incomplete, or inaccurate. Do not rely on the app for legal speed verification, navigation, emergencies, aviation, or other safety-critical use. Obey posted limits and local laws, mount devices safely, and never interact with a device while operating a vehicle. Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Studio Terms: https://timosstudios.com/terms-of-use Privacy: https://www.timosstudios.com/privacy
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
Zustand
react-navigation
expo-location
expo-permissions
BUILD KIT DIFFICULTY
Starter
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.
