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
Ember Timer
A candle in a dark room
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
2 ratings · Top 5%
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.
Build your own version
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/
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 Ember Timer: 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
Include features like workout tracking, social sharing, or integrations with fitness devices.
Assumption to check: Limited functionality compared to comprehensive fitness apps.
Validate with people who use this workflow before building.
Hypothesis 2
Implement user ratings, comments, and suggestions.
Assumption to check: Lack of user feedback options.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance the history section with filters and search capabilities.
Assumption to check: Poor history management.
Validate with people who use this workflow before building.
Hypothesis 4
Allow users to create and save custom timer presets.
Assumption to check: Limited customization options for timers.
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
A candle in a dark room. That's it. Ember Timer is a meditation timer stripped to its essence. No guided audio. No streak counters. No social features. No settings screens. Just a warm flame on a dark background, and silence. Set your duration with a simple drag. Tap to begin. The candle glows in silence. When time is up, a gentle haptic heartbeat and soft velvet ripples bring you back — no jarring alarms, no sudden brightness. It may look simple. That is its strength. In a world of meditation apps competing for your attention, Ember Timer asks for nothing. It sits quietly until you need it, does one thing with care, and gets out of your way. - Warm candle flame animation on deep indigo - Gentle haptic heartbeat upon completion - Soft velvet curtain alert with rippling waves - Tap the golden koi to view past sessions, synced with Apple Health - No accounts, no ads, no tracking - No internet connection required Designed with intention. A quiet space to sit.
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 Navigation
Expo Notifications
Reanimated
Expo Haptics
Zustand
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.
