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
Swim Tempo Trainer
Swim Tempo Trainer turns your Apple Watch into a stroke tempo trainer for swimming.
$4.99
PRICE
$4.99
No 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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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.
What's included
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 Swim Tempo Trainer: 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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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
Swim Tempo Trainer turns your Apple Watch into a stroke tempo trainer for swimming. It beeps at the interval you set (with optional vibration). Swim in time with the beat to keep a steady stroke tempo — perfect for solo practice and building pace awareness. WHO IT'S FOR - Competitive swimmers who want a consistent stroke tempo - Anyone managing sprint pacing - Swimmers who don't want to buy a dedicated tempo device FEATURES - Works on Apple Watch alone — no extra hardware - Sample-accurate beeps that stay steady even at fast tempos - Choose from 3 beep tones (Soft / Sharp / Clear); set the tempo beat and countdown separately - Preview each sound before you confirm it - In-app volume slider, with optional vibration on each beat - Hold −／＋ to change tempo quickly; save your favorite tempos as templates - Set tempo in seconds-per-beat or in SPM (strokes per minute) - 3-2-1 countdown on start; hold the stop button for 1 second to avoid accidental taps - Available in English and Japanese TIP Take the watch off its band and tuck the body inside your swim cap, near the back or side of your head with the screen facing inward, so you can hear and feel the beats underwater. Turn the volume up before you swim. This app is a training aid and is not a medical device.
Written user reviews are not shown here. Check current App Store reviews >
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 social sharing and challenges for user engagement.
Assumption to check: Lack of social features for sharing workouts
Validate with people who use this workflow before building.
Hypothesis 2
Offer customizable workout types and templates.
Assumption to check: Limited workout tracking options
Validate with people who use this workflow before building.
Hypothesis 3
Allow integration with HealthKit or Google Fit for comprehensive tracking.
Assumption to check: No integration with health data
Validate with people who use this workflow before building.
Hypothesis 4
Provide detailed analytics and insights on user performance over time.
Assumption to check: No analytics on performance trends
Validate with people who use this workflow before building.
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
Supabase
react-native-reanimated
react-native-gesture-handler
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
