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
Basic Sports Timer
We use this Basic Sports Timer for our Wing Tsun workouts
$1.99 · In-app purchases
PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 3.0
1 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 included17 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 Basic Sports Timer: map the core Sports 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
Add customizable timer presets for different sports activities.
Assumption to check: Limited functionality compared to other timers
Validate with people who use this workflow before building.
Hypothesis 2
Focus on stability and bug fixes before adding new features.
Assumption to check: Poor user reviews indicating bugs
Validate with people who use this workflow before building.
Hypothesis 3
Incorporate sharing options for lap times on social media.
Assumption to check: Lack of social features
Validate with people who use this workflow before building.
Hypothesis 4
Implement a visual representation of lap times for better user engagement.
Assumption to check: No visual lap 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
We use this Basic Sports Timer for our Wing Tsun workouts. It's quick & easy to set up so you can focus on your training. This simple App can be used for any kind of interval training, HIIT sessions (including Tabata method), boxing, MMA, running, stretching etc. INTERVAL TIMER: • Adjust duration of Workout & Pause and your are ready to go! • Just tap the screen to start / stop • Set number of rounds / Number of rounds are counted until you're done. COUNTDOWN: • Adjust Workout duration and your are ready to go! • Just tap the screen to start / stop BOX-DRILL: Fix duration - 3 Minutes - 1.: Punch hard & consistent against a sandbag for 10 seconds - then take a break for 10 seconds. - 2.: Punch hard & consistent against a sandbag for 20 seconds - then take a break for 20 seconds. - 3.: Punch hard & consistent against a sandbag for 30 seconds - then take a break for 30 seconds. - 4.: Punch hard & consistent against a sandbag for 20 seconds - then take a break for 20 seconds. - 5.: Punch hard & consistent against a sandbag for 10 seconds - then take a break for 5 seconds. - 6.: Punch hard & consistent against a sandbag for 5 seconds. STOPP WATCH: • Saves up to 15 rounds • It’s accurate to 1/100 of a second ALARM: • Set time to start / stop your training session WATCH: • Simple clock FEATURES: • Duration of Workout & Pause can be set between 5 seconds up to 60 Minutes • 5 seconds up to 10 Minutes: 5 seconds steps • 10 Minutes up to 60 Minutes: 1 minute steps • Saves Workout & Pause settings • Initial Countdown & Boxing bells • Portrait and landscape Mode available • Select a background Color for workout, pause and the app itself • Timers are running in background If there is any additional feature you'd like to see in this App please don't hesitate to contact me via: [email protected]. Please support me by rating this app! Thanks and I look forward to your feedback. :-)
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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
React Navigation
Async Storage
Expo AV
BUILD KIT DIFFICULTY
Starter
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.
