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
PaceBeat
PaceBeat is a cadence training tool designed for runners.
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
What's included17 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 PaceBeat: 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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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
Integrate custom workout plans based on user fitness levels.
Assumption to check: Lack of personalized training plans
Validate with people who use this workflow before building.
Hypothesis 2
Offer a variety of metronome sounds and voice cues.
Assumption to check: Limited audio feedback options
Validate with people who use this workflow before building.
Hypothesis 3
Add social challenges to motivate users through community engagement.
Assumption to check: No social features
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed analytics and progress tracking for users.
Assumption to check: Poor analytics tracking
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
PaceBeat is a cadence training tool designed for runners. With a clean, distraction-free interface and no ads, PaceBeat helps you build a stable running rhythm and improve your running efficiency. Set your preferred cadence and training duration, and follow precise haptic feedback or beat sounds to keep every step consistent. Many runners aim for a cadence around 180 steps per minute (SPM), which can help improve running form and reduce impact on the knees. PaceBeat makes cadence training simple and natural. Key Features • Custom cadence training Set your target SPM and train with a steady rhythm. • Stage Training Configure different cadence and durations for warm-up, run, and cool-down. PaceBeat automatically switches stages during training. • Haptic or sound guidance Follow subtle haptic taps on Apple Watch or clear beat sounds. • Clean minimalist design No ads, no distractions — just focus on your run. • One-time purchase No subscriptions. PaceBeat is perfect for runners who want to improve cadence, develop rhythm, and train more efficiently. Find your pace. Feel the beat.
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
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expo-av
@react-native-async-storage/async-storage
BUILD KIT DIFFICULTY
Intermediate
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.
