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
Yummy Whale
See where the big money is moving on Polymarket and Kalshi before the crowd catches on.
Free
PRICE
Free
No in-app purchases
BUSINESS MODEL
Free
No overall Grossing estimate available
RATING
★ 4.2
5 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 included
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.
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App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
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App Store description
See where the big money is moving on Polymarket and Kalshi before the crowd catches on. Yummy Whale is a live prediction market monitor. It flags whale-sized trades ($10,000+ on Polymarket, $20,000+ on Kalshi), filters out the noise, and turns whale activity into one clear call: BUY YES or BUY NO. ONE LIVE WHALE TAPE Whale trades from Polymarket ($10,000+) and Kalshi ($20,000+) stream into a single feed. Filter by venue in one tap and see exactly what size is hitting each market as it happens. ONLY PROFITABLE TRADERS Size alone is not enough. Polymarket trades are shown only from traders with at least $100 in all-time profit, and their profit is displayed right next to the trade. Kalshi orders are anonymous, so they're grouped into one-minute blocks and only $20,000+ flow is flagged. THE STRONGEST SIGNAL One card cuts through everything. Yummy Whale weighs whale consensus across markets and surfaces the strongest signal as BUY YES or BUY NO, with a confidence score so you know how strong the conviction is. SEE THE TRADES BEHIND EVERY CALL No black boxes. Open any signal to see the exact whale trades that drove it, including size, side, and timing. TRADER PROFILES AND SIGNAL ALERTS Dig into any trader's portfolio value and recent trades. Yummy Whale sends a push notification when a high-confidence signal appears, even when the app is closed, capped at a few alerts a day so you're never spammed. NEW ACCOUNT OFFERS Just getting started? Find sign-up bonus codes for Kalshi and Polymarket inside the app. PRO SUBSCRIPTION Upgrade to Pro to unlock full trade details. Choose weekly, monthly, or yearly plans. Payment is charged to your Apple ID at confirmation of purchase. Subscriptions renew automatically unless canceled at least 24 hours before the end of the current period. Manage or cancel anytime in your App Store account settings. IMPORTANT Yummy Whale provides information only and is not financial advice. Always do your own research. Yummy Whale is an independent app and is not affiliated with, endorsed by, or sponsored by Polymarket or Kalshi. Stop guessing. Follow the money. Download Yummy Whale now. Terms of Use: https://yummywhale.rork.app/terms Privacy Policy: https://yummywhale.rork.app/privacy
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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.
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
BUILD KIT DIFFICULTY
Not assessed in a Build Kit yet.
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.
