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
SeasonLeft: Season Countdown
The most aesthetic way to track the passing of time.
$0.99 · In-app purchases
PRICE
$0.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
3 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 should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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 SeasonLeft: Season Countdown: map the core Lifestyle 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 notifications for events.
Assumption to check: Limited functionality for reminders and alerts
Validate with people who use this workflow before building.
Hypothesis 2
Implement modern UI components and animations.
Assumption to check: Poor user interface design
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to share countdowns on social media.
Assumption to check: No social sharing options
Validate with people who use this workflow before building.
Hypothesis 4
Enable users to choose custom colors or themes.
Assumption to check: Lack of customization for event colors
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
The most aesthetic way to track the passing of time. SeasonLeft puts a beautiful countdown to Spring, Summer, Fall, and Winter directly on your Home and Lock Screen. See exactly how much of the year is left at a glance. Track seasons worldwide with a clean, accurate countdown to the next seasonal shift—wherever you live. SEE YOUR SEASON AT A GLANCE Always know: * How many days remain * When the next season begins * How far through the year you are Whether you’re waiting for summer warmth, autumn colors, or winter snow—stay connected to the rhythm of the year. BUILT FOR THE WHOLE WORLD SeasonLeft adapts automatically to your location and your preferred tracking method: * Meteorological & Astronomical: Choose between standard calendar months or precise solar equinoxes and solstices. * Northern Hemisphere: Traditional 4 seasons. * Southern Hemisphere: Reversed seasonal calendar. * East Asia: Solar term–based transitions. * Southeast Asia: Cool, Hot, and Monsoon seasons. No setup required. Everything adjusts automatically. HOME & LOCK SCREEN WIDGETS Choose your style: * Small — simple days countdown. * Medium — season details + remaining time. * Add it to your Lock Screen for instant visibility. SIMPLE. MINIMAL. FOCUSED. * No ads. * No subscriptions. * No unnecessary features. * Just a beautifully designed seasonal progress tracker. WHY PEOPLE LOVE SEASONLEFT Weather apps show you hours. SeasonLeft shows you perspective. It answers one timeless question: How much of this season is left? FEATURES * Automatic season detection * Meteorological & Astronomical date options * Countdown to next season * Season progress tracking * Home Screen & Lock Screen widgets * Global hemisphere awareness * Monsoon & Solar term tracking * Works offline * One-time purchase
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
Supabase
Zustand
React Navigation
React Native Date Picker
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.
