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
EchoBag
EchoBag is the intelligent packing assistant that takes the stress out of travel
$2.99 · In-app purchases
PRICE
$2.99
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.
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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.
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 EchoBag: 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
Introduce a more robust itinerary sharing feature with real-time collaboration.
Assumption to check: Limited features for itinerary management compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Implement offline mode for users to access packing lists without internet.
Assumption to check: Lack of offline access to packing lists
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the subscription process and improve user onboarding for in-app purchases.
Assumption to check: In-app purchase process can be complex
Validate with people who use this workflow before building.
Hypothesis 4
Add a feedback feature within the profile to gather user insights.
Assumption to check: No user feedback mechanism for app improvements
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
EchoBag is the intelligent packing assistant that takes the stress out of travel. Instead of generic checklists, EchoBag builds a personalized packing list based on your trip type, destination weather, travel mode, and packing style — then helps you actually get everything packed before you leave. SMART PACKING LISTS EchoBag generates a customized list the moment you create a trip. Tell us where you're going, how you're getting there, and how you like to pack — we'll handle the rest. Beach vacation? Business trip? Adventure hiking? Every trip type gets its own tailored recommendations. REAL WEATHER INTEGRATION EchoBag pulls live weather forecasts for your destination so your packing list reflects what you'll actually experience. Rainy days add an umbrella. Cold nights add layers. Hot weather adds sunscreen. No more guessing. BAG ORGANIZATION SYSTEM Pack smarter with EchoBag's bag system. Add the bags you're bringing — carry-on, checked bag, backpack, toiletry bag — and EchoBag automatically assigns every item to the right bag. You'll always know exactly where everything is. SMART ALERTS & MISSING ESSENTIALS EchoBag actively watches your list and flags what matters. Forgot your passport on an international trip? Leaving tomorrow with essentials still unpacked? EchoBag catches it before you do. TRIP SHARING Planning a trip with others? Share your packing list and collaborate in real time. Everyone stays on the same page. WORKS FOR ANY TRIP - Beach vacations - Business travel - Weekend getaways - City trips - Family travel - Adventure & hiking - Road trips - Study abroad Whether you're a minimalist or an overpacker, EchoBag adapts to your style and makes sure nothing important gets left behind.
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
Firebase
Axios
React Navigation
Zustand
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.
