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
Whale Tracker - Sightings Map
See whales — in real time.
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.1
21 ratings · Top 30%
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 included16 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 Whale Tracker - Sightings Map: 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
Simplify the reporting form to make it user-friendly.
Assumption to check: Users often find it hard to contribute sightings due to complex forms.
Validate with people who use this workflow before building.
Hypothesis 2
Implement advanced filtering based on species, date, and location.
Assumption to check: Inadequate filtering options for sightings.
Validate with people who use this workflow before building.
Hypothesis 3
Add features for users to connect and share their sightings.
Assumption to check: Lack of social features for sharing experiences.
Validate with people who use this workflow before building.
Hypothesis 4
Introduce gamification elements to encourage regular usage.
Assumption to check: Poor user engagement after initial download.
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
See whales — in real time. Whale Tracker turns every coastline into a live map of what's out there right now — verified whale sightings near you, reported by a trusted community of spotters, captains, and researchers worldwide. WHAT YOU CAN DO • Live sightings map — orca, humpback, blue, sperm, grey, fin & southern right whales • Sightings near you — see what's been spotted on your coast today • Proximity alerts — get notified the moment a whale is near, by species and radius • Follow individual whales — know when one you're tracking is seen again • Worldwide coverage — USA, Canada, Hawaii, Australia, New Zealand, Norway, Iceland, the Azores, Japan, UK & dozens more • Migration routes — follow the giants as they travel • Captain Mode — live chart with real-time proximity alerts & speed warnings for boaters • Listen Live — hear orcas and humpbacks on live underwater microphones • Whale news & articles — whale science, conservation & current sightings Whether you're whale watching, boating, fishing, or just love the ocean, Whale Tracker puts the sea in your pocket. Download and see what's swimming near you today. Auto-Renewable Subscription Some features require an active subscription. Payment is charged to your Apple ID at purchase confirmation. Subscriptions auto-renew unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID settings. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://sites.google.com/view/orca-spotter-privacy-policy/home
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
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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.
