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
SpeedClock - Video Radar
The iPhone speed radar - easy-to-use speed measurement in your pocket, anytime, anywhere!
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 2.4
83 ratings · Below Average
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 included19 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 SpeedClock - Video Radar: map the core Utilities 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 more accurate speed measurement algorithms.
Assumption to check: Inconsistent performance in speed calculations
Validate with people who use this workflow before building.
Hypothesis 2
Add features like sharing results or setting speed limits.
Assumption to check: Limited functionality and features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 3
Enhance UI with better design and more intuitive navigation.
Assumption to check: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 4
Improve app stability and memory management.
Assumption to check: Frequent crashes during video recording
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
The iPhone speed radar - easy-to-use speed measurement in your pocket, anytime, anywhere! A unique, advanced app designed to easily measure the speed of cars, boats, skaters, skiers, cyclists, animals, models, footballs, tennis serves, etc. The system is based on motion detection, enabling you to track a moving object using a hand-held device alone. SpeedClock includes three separate speed measurement tools and two distance estimation tools. Speed Radar SpeedClock uses the camera to detect and analyze motion, and a reference distance to calculate the speed of an object. Define the distance to the object of interest, hold the iPhone still and let the object pass across the the screen. The speed is displayed automatically. SpeedClock is also able to automatically measure the speed and save an image of passing objects. The measurement can be initiated from an Apple Watch and the speed displayed on the watch face. High Speed Video Recording An additional speed tool records and processes a video, which enables SpeedClock to track small, fast object, such as flying balls, that can be difficult to catch with regular motion detection. It also calculates additional parameters like acceleration. Synchronized Timing Gates A third speed instrument uses two iPhone/iPads equipped with motion detection to start and stop the timer and measure the speed. The distance between the devices is used as reference, and the speed is calculated based on the time taken by the object to travel between the 'Start' and 'Stop' devices. The time is transmitted wirelessly over WiFi or Bluetooth. Distance Measurement The stadimeter uses the size of a known object, e.g. a car, to calculate the distance. The clinometer uses your own height as reference, along with the angle of the iPhone, to estimate the distance to a point on the ground. The distances obtained from either tool can then be used to calculate the speed. See a demo video at the application website (www.appmaker.se/speedClock) ON LINE REVIEWS “All I can say is, Fantastic” http://www.madxperts.com/2010/12/03/measure-speed-app-speedclock-iphone-download/ "Wow, how cool is that!" http://www.ithinkdiff.com/turn-iphone-speed-measuring-gun-speedclock-download/ "You really going to like this app" dailyappshow.com/speedclock (video) "A useful utility for anyone needing to measure speed" appmodo.com/44581/ "Useful, easy to use and quite a bit of fun (4 of 5)" appvader.com/2011/03/review-speedclock-iphone/ "speedClock is a useful app when you need to check the speed of yourself, or an object for exercise, racing or simple curiosity (4.5 of 5)" www.cooliphoneipadapps.com/2010/12/speedclock.html "Astonishing" iphonelife.com/blog/5/speedclock-velocity-radar-099-app-lets-you-use-camera-measure-speed-objects "It is a pleasure to use and operate. A nice app for those looking for a open-ended radar gun app." http://appadvice.com/appguides/show/baseball-radar-gun-apps
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
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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.
