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.
Playbook is one of the top fitness apps on the market where you can support your favorite creators directly
Free · In-app purchases
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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Playbook - Trainers & Workouts: 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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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
Assumption to check: Limited free content and high reliance on subscriptions.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: In-app navigation can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social features for user engagement.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Performance issues with loading times for media content.
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Playbook is one of the top fitness apps on the market where you can support your favorite creators directly. THE MAJORITY OF YOUR SUBSCRIPTION GOES DIRECTLY TO THE PEOPLE CREATING THE WORKOUTS AND CLASSES YOU LOVE. Get access to the world’s leading fitness influencers, trainers, wellness gurus, athletes, and more all on your phone. With over 56,000 workouts and more than 500 instructors, there is something for everyone to achieve health and wellness goals. Take Playbook with you to the gym; workout at home and even while traveling — with the ability to download workouts you can sweat any time, anywhere. Premium features: • Join a community of motivated individuals to help reach your goals • Communicate directly with your favorite creators • Get daily workouts and access to programs and challenges (with prizes) • Wellness guides for the full experience: Nutrition, supplements, recipes, mindset, productivity, and more • Unlimited offline downloads, plus stream to other devices • Favorite workouts, schedule classes, and track your progress • Live streaming classes to workout with instructors in real time • Your subscription money supports your favorite creators directly • Compatible with Apple health SUBSCRIPTION PRICING & TERMS Playbook is free to download and includes a 7-day free trial period to unlock access to the entire platform, including all instructors, workouts, programs, and videos. After trial period there are two subscription options: $14.99/month $99.99/year These prices are for United States customers. Pricing in other countries may vary and actual charges may be converted to your local currency depending on the country of residence. Your iTunes account will be charged when the purchase is confirmed. If you subscribe before your free trial ends, the rest of your free trial period will be forfeited as soon as your purchase is confirmed. Your Playbook subscription will automatically renew unless turned off in your iTunes Account Settings at least 24 hours before current period ends. You can go to your iTunes Account settings to manage your subscription and turn off auto-renew. Read Terms and Conditions here: www.playbookapp.io/terms-of-use Read Privacy Policy here: http://www.playbookapp.io/privacy-policy
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.