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.
My LapTimer is primarily a native Watch app for runners doing laps or interval training
$0.99
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.
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.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for My LapTimer: map the core Health & Fitness workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
My LapTimer is primarily a native Watch app for runners doing laps or interval training. It is easy to start and stop a lap with a single tap: • no countdown timer to start • no swiping or double-taps to finish a lap. The native Watch app works even when the iPhone is not present. Elapsed time, distance (as reported by the Watch) and pace and, optionally, heart rate are displayed while running. Lap distance, duration and pace are saved on the Watch and these can be viewed by swiping right to left. Distance, duration and calories are also optionally stored in HealthKit and contribute to the Activity rings. Workout location and type can be selected above the HealthKit switch on the 3rd screen on the Watch: this is the app's Settings screen. Distance and pace can be displayed in metric or imperial measurements. Multiple consecutive laps can be timed - the Multiple Laps switch on the watch app's settings screen below the Haptic Feedback switch. These are sent to HealthKit as a single workout. The Fitness app shows the number of laps in the workout. There can be a rest time between laps: set the switch on the watch's Settings screen. Double-tap to finish a workout when there are multiple laps. If the lap distance is known then set this on the Settings screen. It will be recorded as the distance rather than what the watch detects. This is useful when the workout is indoors. Heart rate can be optionally shown on the first screen. There is a switch on the Settings screen. Haptic feedback after every mile or 1000 meters can be selected. At the bottom of the list of completed laps there is a Clear button to delete all the laps in the Watch app's database; this could be used at the start of a session. The companion iPhone app can be used to view, modify and delete laps, as well as share any day's laps or multiple days' laps as a CSV file via email e.g. send to your coach. Data is transferred from the Watch to the paired iPhone whenever the completed lap times screen in the Watch app is viewed by swiping right to left on the main screen and the iPhone app is nearby and active. The app's database on the iPhone can be backed up using iTunes File Sharing. REVIEW "This App does just what I want it to do. Multiple laps, with individual lap times, distance & speed. It’s ideal for Tempo training and works a treat Highly recommended" CUSTOMER SUPPORT If you have any issues, please send an email via the App Support button on the iTunes Ratings and Review screen or the Developer Website link.
Written user reviews are not shown here. Check current App Store reviews >
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
Assumption to check: Limited functionality compared to other lap timer apps
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Fixed UI elements with no customization
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No integration with health tracking apps
Validate with people who use this workflow before building.
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.