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
Countdown
Countdown is a free, super easy to use countdown timer and reminder for the important events & dates in your life.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
185,847 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.
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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 included18 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 Countdown: map the core Utilities 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
Allow users to customize countdown themes and notifications.
Assumption to check: Limited customization options for countdowns.
Validate with people who use this workflow before building.
Hypothesis 2
Implement home screen widgets for quick access to countdowns.
Assumption to check: No widget support for quick view.
Validate with people who use this workflow before building.
Hypothesis 3
Enhance sharing options to include various social media and messaging platforms.
Assumption to check: Difficulties sharing countdowns across platforms.
Validate with people who use this workflow before building.
Hypothesis 4
Clarify the benefits of in-app purchases with a better onboarding process.
Assumption to check: In-app purchase confusion.
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
Countdown is a free, super easy to use countdown timer and reminder for the important events & dates in your life. Features: • Check your events on the Lock Screen with our widget (Premium feature) • Glance at your events on your Apple Watch • Glance at your events using our widget in StandBy (Premium feature) • Place our Widget anywhere on your Home Screen to view your most important events (Premium feature) • Share your countdowns with friends and family • Auto Import (Premium): Connect your calendars to Countdown and automatically add new events. • Pick any color you'd like for your countdown background • In addition to receiving a notification when it is time for your event, you can receive reminders 1 day before or 1 week before the event. • Choose the format in which you want to see your countdown (Premium feature) • Create as many events as you'd like • Count up from past events (available on each countdown page) • Sync your events across your devices with iCloud • Set your countdowns to repeat yearly, monthly, weekly or daily • Sort your events from the closest to the most distant • Dark Mode • Add notes to your events • Count only working days • Have many events? Organize them with tags Add as many events as you want: Vacation, Birthday, Holiday, Party, Thanksgiving, Christmas, Halloween, Cruise, Valentines, Wedding, Anniversary, Birth, Baby, Graduation, Pregnancy, Trip, New Home, Retirement, Game, Goals, Concert and many more. ——— QUESTIONS OR FEEDBACK? ——— We love hearing from you and we read every single email you send us! Have suggestions? Feel free to contact us at [email protected]
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
React Navigation
Zustand
react-native-async-storage
date-fns
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.
