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
Sleeper - Fantasy Sports
Sleeper – #1 Sports Super App
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
296,775 ratings · Top 15%
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.
Build your own version
Build Kit
Make this idea yours
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Add to a Remix
Combine features and design from your favorite apps.
Kit ready. Verify your email to download it.
Generating… usually about a minute.
Make it yours Optional
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
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/
Preview a sample Build Kit No email needed
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.
JavaScript is required to complete mailbox verification.
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 Sleeper - Fantasy Sports: map the core Sports workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
Preview ready. Verify your email to reveal and copy the full prompt.
JavaScript is required to complete mailbox verification. Return to this prompt preview.
Continue in Rork >
Affiliate link: CloneChart may earn a commission at no extra cost
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Screenshots
< Scroll to see more >
App Store description
Sleeper – #1 Sports Super App Sleeper is the #1 sports app to make team picks, play real-money games, join fantasy leagues, and follow live sports events — all in one place. NEW: SleeperSafe - collect fantasy league dues & pay out winners securely in-app.* Track live scores, chat with friends, trade fantasy players, and win real cash across major sports. Fantasy Leagues, Pick’em & Survivor Pools - Play Lock-in Fantasy Basketball, only on Sleeper. Draft, trade, and manage H2H leagues for NBA, NFL, EPL, LaLiga and Ligue 1. - Survivor & Pick’em Pools – Pick weekly game winners and compete H2H for bragging rights - NEW: League Dues with SleeperSafe*. Commissioners can collect dues and pay out prizes all in the Sleeper app Player Picks* - Make more/less picks on players and win up to 1000x real cash - Pick players on NFL, NBA, MLB, NHL, WNBA, Soccer, College sports, Esports, Combat sports & more - New users get up to $100 deposit match for Player Picks - Fast payouts and secure deposits with Apple Pay, Venmo, PayPal, bank transfer, and cards - Available in 31 states, including CA, TX, and GA Team Picks - offered by Sleeper Markets LLC* - Make picks on real teams - Pick YES on a game winner across NFL, NBA, MLB, WNBA, Soccer, College sports, Tennis, Golf, esports and more - Predict outcomes for live and upcoming events, including spreads, totals, and more - Follow live games, call your shot, and cash in on your beliefs - Regulated by the CFTC & NFA Stay Connected with Live Sports - Live Game Chat – Talk trash, react to plays, and sweat games together - Player & Team Chat – Discuss trades, picks, and markets movement - Real-Time Alerts – News, injuries, scores, and live updates in one feed Why Sleeper - One app for fantasy leagues, team picks, player picks, live games, and social chat - Clean, modern design built for speed - Perfect for casual fans and serious players - The All-in-One, Sports Super app — only on Sleeper Download Sleeper today — make your picks, cash in your wins. — *For Picks and SleeperSafe products users must be 18+ (Player Picks: 19 in AL/NE; 21 in MA/VA). Team Picks products involve degrees of risk, such as loss of funds, and participation is subject to eligibility requirements and applicable law. Nothing herein is a solicitation, recommendation, or offer to buy or sell any financial instrument, or to engage in any transaction. See our General Terms of Use at sleeper.com/terms for additional restrictions. Use responsibly. Contact 1-800-MY-RESET for help. © Blitz Studios, Inc.
Written user reviews are not shown here. Check current App Store reviews >
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 advanced search and filter functionalities to enhance user experience.
Assumption to check: Difficulty in finding leagues due to poor search and filter options
Validate with people who use this workflow before building.
Hypothesis 2
Add features like chat rooms or messaging within leagues.
Assumption to check: Limited social features for engaging with friends
Validate with people who use this workflow before building.
Hypothesis 3
Simplify the draft process with better tutorials or guided steps.
Assumption to check: Complexity in the draft process leading to user confusion
Validate with people who use this workflow before building.
Hypothesis 4
Improve data-fetching strategies to ensure timely updates.
Assumption to check: Inconsistent real-time scoring updates
Validate with people who use this workflow before building.
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-query
@react-navigation/native
Firebase
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.
