App Overview

WhenToLeave icon

WhenToLeave

Jeoffrey Lambujon · Travel

Know exactly when to leave for your flight

$1.99 · In-app purchases

PRICE
$1.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
5.0
16 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 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.

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.

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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Quick prompt

> SELECT BUILD PLATFORM:

Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.

// RORK SYSTEM PROMPT
Rork plan preview for WhenToLeave: map the core Travel 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

Integrate real-time traffic data and personalized alerts.

Assumption to check: Users often find it difficult to predict traffic conditions accurately.

Validate with people who use this workflow before building.

Hypothesis 2

Use multiple weather APIs to improve accuracy.

Assumption to check: Weather forecasts can be unreliable.

Validate with people who use this workflow before building.

Hypothesis 3

Simplify the subscription process and provide clear options.

Assumption to check: Subscription management can be confusing.

Validate with people who use this workflow before building.

Hypothesis 4

Add social sharing options and user trip tracking.

Assumption to check: Limited user engagement features.

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

Know exactly when to leave for your flight. That's it. For people who just want to know when to leave for the airport — not track their plane across the Atlantic. When to Leave gives you a complete departure timeline, from walking out your door to arriving at your gate. No subscriptions. No 47 features you'll never use. Just the one thing you actually need. HOW IT WORKS 1. Enter your flight details (or look up by flight number) 2. Add your starting address 3. Tell us how you travel (TSA PreCheck? Checking bags? Want some buffer time?) 4. Get your personalized timeline That's it. Done in 30 seconds. YOUR TIMELINE INCLUDES - When to leave home (with real-time drive time + traffic) - When to arrive at parking or rideshare drop-off - TSA security checkpoint timing (live wait times for 100 US airports) - Time for food, lounge, or just breathing room - When to start walking to your gate - Boarding time BUILT FOR REAL TRAVELERS - TSA PreCheck & CLEAR support — accurate wait time estimates - Parking vs. rideshare options — different buffer times - 100 US airports with live TSA data - Checked bags? We add time for that - Flight number lookup — auto-fills departure time and terminal SHARE YOUR TIMELINE Send your departure time to family, friends, or yourself via text or email. One tap. NO ACCOUNT. NO SUBSCRIPTION. NO NONSENSE. Other travel apps charge $50/year and require an account just to tell you when to leave. We don't. Pay once, use forever. Open the app, enter your flight, get your answer. Less than your airport coffee. More peace of mind than you've ever had catching a flight.

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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.

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BUILD KIT DIFFICULTY
Advanced

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.