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
League Tycoon Fantasy Football
League Tycoon is THE dynasty fantasy football platform
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.8
2,006 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 League Tycoon Fantasy Football: map the core Sports 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
Implement a more robust league discovery feature with recommendation algorithms.
Assumption to check: Difficulty in finding leagues to join due to limited visibility
Validate with people who use this workflow before building.
Hypothesis 2
Create a simplified interface for team management with drag-and-drop functionality.
Assumption to check: Complexity in managing team lineups
Validate with people who use this workflow before building.
Hypothesis 3
Clarify subscription benefits and provide a clearer comparison between tiers.
Assumption to check: Subscription confusion due to multiple tiers
Validate with people who use this workflow before building.
Hypothesis 4
Add gamification elements like achievements and leaderboards to increase user engagement.
Assumption to check: Limited engagement features for users
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
League Tycoon is THE dynasty fantasy football platform. Run a free standard dynasty league or add contracts and salary caps — all in one clean app built for dynasty, not a redraft app with dynasty added on. FREE STANDARD DYNASTY Start and run a standard dynasty league for free. Manage rookie drafts, future picks, superflex formats, startup drafts, and long-term roster building in one modern platform. BUILT FOR DYNASTY, NOT REDRAFT Most fantasy apps started with redraft and added dynasty later. League Tycoon was built specifically for dynasty leagues, so the tools, league flow, and offseason experience are made for long-term play. SLOW AUCTION DRAFTS Run slow auctions with 20+ players at once so your league doesn’t need one long draft session. Great for startup auctions, busy schedules, and deeper price discovery. TRADE AUCTIONS Trade auctions help dynasty leagues find fair value for players and rookie picks. Instead of “I would have offered more,” your league gets a transparent market for contenders, rebuilders, future picks, and win-now moves. LEVEL UP WITH CONTRACT DYNASTY Want more depth? Add contracts and salary caps without spreadsheets. League Tycoon automates contract bidding, cap tracking, extensions, league rules, and the year-round decisions that make salary cap dynasty so fun. DYNASTY LEAGUE TOOLS Assign, track, and trade compensatory picks. Use draft lottery tools to discourage tanking and manage rookie draft order more fairly. LEAGUE HISTORY & HALL OF FAME Preserve your league’s story with champions, trophies, records, rivalries, head-to-head history, and all-time stats. NO ADS. NO SPORTSBOOK CLUTTER. Just dynasty fantasy football on mobile and web. PLUS EVERYTHING YOU EXPECT Live scores, player news, game logs, chat, and tools that feel modern and easy to use. If you’re running a dynasty league, this is where it should live. Terms of Use: https://leaguetycoon.com/terms/
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
Supabase
Zustand
react-query
expo-router
BUILD KIT DIFFICULTY
Expert
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.
