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
Zwift: Indoor Cycling Fitness
Zwift: Indoor cycling made fun
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 4.7
21,402 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.
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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 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.
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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 Zwift: Indoor Cycling Fitness: map the core Health & Fitness 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 a wider selection of free workouts to attract more users.
Assumption to check: Limited workout variety for free users
Validate with people who use this workflow before building.
Hypothesis 2
Implement better server infrastructure for stability.
Assumption to check: Occasional connectivity issues during live events
Validate with people who use this workflow before building.
Hypothesis 3
Develop guided onboarding tutorials to simplify initial navigation.
Assumption to check: Overwhelming complexity for new users
Validate with people who use this workflow before building.
Hypothesis 4
Introduce competitive pricing tiers and limited-time offers.
Assumption to check: High subscription cost compared to competitors
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
Zwift: Indoor cycling made fun Join millions of people on the app that makes indoor cycling fun for everyone. Whether you’re a seasoned athlete or just starting, jump into virtual bike rides in immersive 3D worlds, challenge yourself on epic climbs, and explore endless roads. With racing, group rides, cycling workouts, and structured training plans, Zwift can deliver serious fitness results. Connect Your Bike Seamlessly connect your smart bike, like Zwift Ride, or your bike and smart trainer – including ones from Zwift, Wahoo, Garmin, and more – to your smartphone, tablet, or AppleTV, and start chasing your fitness goals from the comfort of your home. Immersive Virtual Worlds Explore over a hundred routes in 12 immersive, virtual worlds. Whether it's the epic climbs in Watopia or the serene beauty of the Scottish highlands, every ride is a new chance to explore. Join a Global Community Join a global community pulsing with energy and enthusiasm. Connect with friends, make new ones, and immerse yourself in group rides, races, and events. Track your stats and stay connected with friends, clubs, and the community—on and off the bike— with the Zwift Companion app. Zwift even connects to Strava, ensuring a seamless fitness tracking experience. Indoor Training Plans, Tailored to You Our world-class coaches and champion cyclists have crafted plans and workouts for every level. Whether you’re starting out or stepping it up, find your perfect plan. With flexible options, from quick 30-minute burns to long endurance rides, Zwift also has 1000s of on-demand workouts that fit your schedule and goals. Race Any Time Of Day Racing riders from around the world is one of the most effective ways to get fit. But don’t be intimidated! Zwift is home to the world’s largest community of competitors—from first-time racers to elite athletes—guaranteeing there’s a friendly challenge for everyone. Ride and Run! Not just for cyclists, Zwift welcomes runners too. Sync your smart treadmill or footpod device — you can get our RunPod directly from Zwift—and step into the worlds of Zwift, where every walk or run gets you one step closer to your goals. Join Zwift Today There’s never been a better time to combine fun with real results. Download Zwift now and start from wherever you are with a free trial for first-time users. Download today Please see the Terms of Use at zwift.com/terms, and EULA at support.zwift.com/en_us/end-user-license-agreement-rymuiTZr
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
Axios
React Navigation
Zustand
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.
