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
OnionTimer · Time/Rep + Voice
OnionTimer – Your Professional At‑Home Training Assistant
$3.99 · In-app purchases
PRICE
$3.99
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's included16 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 OnionTimer · Time/Rep + Voice: 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
Provide extensive customization for timer settings and voice prompts.
Assumption to check: Users often find existing timer apps lack customization options.
Validate with people who use this workflow before building.
Hypothesis 2
Implement cloud sync for user settings and history.
Assumption to check: Many users report that timers do not sync well across devices.
Validate with people who use this workflow before building.
Hypothesis 3
Create a clean, ad-free experience with a one-time purchase option.
Assumption to check: Users dislike ads and excessive prompts in free versions.
Validate with people who use this workflow before building.
Hypothesis 4
Offer detailed workout history with analytics.
Assumption to check: Limited historical data tracking in most timer apps.
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
OnionTimer – Your Professional At‑Home Training Assistant Core Features • Multi-Round Circuits: Perfect for HIIT, Tabata, and other structured interval formats • Dual Modes: Time Mode for planks, yoga holds, stretches; Count Mode for push-ups, squats, and other strength movements • Set Management: Customize rest between sets; auto-advance keeps training flow uninterrupted • Voice Guidance: Action changes, rest alerts, and set counts—eyes & hands stay on form • Haptic Feedback: Stay informed in silent environments without disturbing others • Data Tracking: Every set recorded with detailed progress insights Training Scenarios • HIIT (High-Intensity Interval Training) • 4‑Minute Tabata Protocol • Yoga / isometric hold timing • Strength training set management • Mobility & post-session stretching • Functional conditioning circuits Distinct Advantages • Modern & Minimal: Clean, intuitive, distraction-free interface • Precision Timing: Second-accurate engine ensures consistent pacing • Data Privacy: Stored locally (or via your personal WebDAV) for full control • Dark Mode: Light / dark themes for day & night comfort • Ad-Free: Pure focus—no interruptions Perfect For • Home fitness plans • Yoga studio session structuring • Rehab & recovery progression • Personal coaching templates • And more waiting for you to unlock Whether you’re dialing in explosive HIIT intervals, running Tabata rounds, or holding steady yoga poses, OnionTimer adapts to your rhythm. Smart rest handling plus clear voice prompts let you focus on movement quality—not on watching the clock. Start now—make every set more focused, more efficient, more intentional. We’d love to hear from you. Your feedback matters: Email: [email protected] Xiaohongshu: @Dulk
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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
Supabase
Zustand
expo-av
react-navigation
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.
