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
Aquarium 4K - Ultra HD Video
Introducing Aquarium 4K: The most innovative and insanely beautiful Ultra HD Aquarium application ever conceived
$2.99 · In-app purchases
PRICE
$2.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 5.0
1 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/
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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 Aquarium 4K - Ultra HD Video: map the core Entertainment 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
Offer user-generated content or partnerships with aquarists.
Assumption to check: Limited content variety in aquarium videos
Validate with people who use this workflow before building.
Hypothesis 2
Implement adaptive bitrate streaming.
Assumption to check: Potential buffering issues on slower connections
Validate with people who use this workflow before building.
Hypothesis 3
Allow users to create playlists or customize categories.
Assumption to check: Lack of personalization options
Validate with people who use this workflow before building.
Hypothesis 4
Ensure reliable download functionality for offline viewing.
Assumption to check: Inconsistent offline access
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
Introducing Aquarium 4K: The most innovative and insanely beautiful Ultra HD Aquarium application ever conceived. Aquarium 4K features over 20 breathtaking 4K Ultra HD videos, with each 4K Videos include a huge variety of exotic fish; including but not limited to: Sting Rays, Jelly Fish, Cat Fish, Clown Fish, Lion Fish, Sea Horses, Alligators, and much more! Also visit a variety of locations around the world the Great Barrier Reef, the Bahamas Barrier Reef, Thailand, and more. If that wasn't enough, Aquarium 4K also displays weather information, includes a 3D Earth with live data, and even has various Radars to choose from making Aquarium 4K four applications in one. With Aquarium 4K, enjoying real Aquariums has never been so hyper-realistic and enjoyable! Aquarium 4K can also optionally display useful information such as Weather and Time and allows you to customize on screen Widgets (or no Widgets at all) as well as choosing a custom 4K video super easily. Don't have a lot of hard drive space? No problem! Aquarium 4K takes advantage of the latest iOS technologies to download 4K videos as needed, and if you get low on hard drive space, Aquarium 4K will automatically delete 4K videos that aren't in use* And best of all, Aquarium 4K is Universal, so with one purchase you get the application for iPhone, iPad, and Apple TV! *1 GB of space hard drive space recommended, 1.5 GB to store all 4K Videos (for the best experience) Super Cool Features! - Over 20 4K Ultra HD Themes as Relaxing Ultra HD Video - 4K Videos include: Sting Rays, Jelly Fish, Cat Fish, Clown Fish, Lion Fish, Sea Horses, Alligators, and more - Visit locations around the globe including the Great Barrier Reef, the Bahamas Barrier Reef, Thailand, and more - Choose a Custom 4K Video with Graphical Theme Chooser - Choose three different Widget Styles providing timely and useful information; or no Widgets at all - Interactive 3D Earth with Live Clouds, Earthquakes, and Tropical Cyclones - On-Demand downloading of 4K videos automatically optimizes hard disk space - Weather works for hundreds of thousands of locations worldwide - Automatic Location Detection or Manually enter Locations for Weather - Unlimited Multiple Weather Locations - Imperial/Metric System (Fahrenheit/Celsius) Weather support - Incredibly easy to use!
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
axios
react-navigation
@react-native-async-storage/async-storage
expo-video
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.
