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.
LapTrak is a running activity tracker with features designed for speed, interval, and lap training
$2.99
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 LapTrak: 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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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: Inconsistent performance tracking during runs
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization for lap settings
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Poor user interface and experience
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited social features
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
LapTrak is a running activity tracker with features designed for speed, interval, and lap training. Activities can be tracked using the LapTrak iPhone or Apple Watch app. If you have an Apple Watch, you can leave your iPhone at home, with activities syncing back to the iPhone app upon completion. Integration & Compatibility: LapTrak integrates with HealthKit, Strava, and the Health & Activity apps, allowing your runs to contribute to your daily stats. You can upload activities to Strava with one tap or export them in TCX format for other platforms. Core Features: LapTrak excels at tracking and analyzing individual laps, regardless of their time or distance. You can manually track laps with the large lap button or let a training program handle it automatically. • Classic Laps: Free program for manual or auto lap tracking with customizable lap distances. Great for sprints, intervals, splits, and reminders like halfway points or gels. • Upgraded Programs: Available for purchase and fully customizable: • Lap Repeats: Fast + recovery laps by time, distance, or location. • Pyramid Laps: Intervals with increasing and decreasing durations. • Tabata: 8x 20-second sprints with 10-second recoveries. • Tempo: Target a hard pace based on your 5K time. • Yasso 800s: Predict and train for marathon goals. During the Run: LapTrak offers interval and total run stats at a glance, with optional spoken feedback. Switch between interval and overall stats mid-run with a tap. Both iPhone and Apple Watch apps include outdoor and indoor modes: • Outdoor: Tracking via GPS • Indoor Manual: Input treadmill speed yourself. • Indoor Bluetooth: Automatically track speed with compatible treadmills. LapTrak also features a cadence training aid, providing audio feedback to help you hit your target cadence. Post-Run Analysis: After your run, LapTrak provides a detailed breakdown of overall and interval stats. On the iPhone app, view summaries, interactive maps, and tables of interval splits, including pace, distance, time, elevation, heart rate, and cadence. Select intervals for deeper analysis, including pace graphs and rankings. LapTrak also highlights fast intervals, showing specific stats alongside overall results. For back-and-forth sprints or track workouts, LapTrak groups points for clearer analysis. Additional Features: • Social media sharing with detailed stat views. • KM/mile support, pause & auto-pause, heart rate tracking, and warmup/cooldown options. • Highly configurable to suit any running style.
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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.