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.
Train your mind with Lumosity’s fun science-based brain games, played by over 100 million users worldwide.
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 Lumosity: Brain Training Games: map the core Education workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Train your mind with Lumosity’s fun science-based brain games, played by over 100 million users worldwide. Lumosity is a leading brain training app with cognitive games and puzzles to exercise Memory, Attention, Problem Solving and more. WHAT’S INSIDE THE APP •40+ Brain games that adapt as you play •Daily workout plans to train your brain •Insights into your performance •Track your progress and achieve your training goals GET STARTED WITH A FIT TEST Take a free, 10-minute Fit Test to set your baseline scores and see how your scores compare to others in your age group. EXPLORE BRAIN GAMES BY SKILL Choose the skill you want to target by playing games for speed, memory, attention, flexibility, problem-solving, math and word games. DAILY PERSONALIZED BRAIN WORKOUTS Build daily habits with workouts curated for you. Get personalized challenges based on your training habits and preferences. Practice key skills through curated, targeted brain games. DETAILED TRAINING INSIGHTS Discover your strengths across games with in-depth performance insights. Explore patterns in your gameplay to better understand how you engage with different challenges. THE SCIENCE BEHIND LUMOSITY We’re a team of scientists and designers exploring new ways to challenge the brain and advance cognitive research. We take established cognitive and neuropsychological tasks, or create entirely new, experimental challenges. We then transform these tasks into games and puzzles that challenge core cognitive skills. We also collaborate with 40+ university researchers worldwide. We provide qualified researchers free access to Lumosity’s tools, to support new investigations in the cognitive sciences. WHO IS LUMOSITY FOR? •People of all ages who enjoy challenging their minds with fun, challenging games •Lifelong learners interested in games that engage cognitive skills. •Anyone aiming to exercise Memory, Speed, Attention, or Problem Solving skills. Whether you're drinking your morning coffee or winding down before bed, Lumosity makes it easy to fit a meaningful brain training session into your day. Join millions using Lumosity to train their minds. Download today and build your brain training habit. GET HELP: https://lumositybeta.zendesk.com/ FOLLOW US: http://twitter.com/lumosity LIKE US: http://facebook.com/lumosity LUMOSITY PREMIUM & TERMS With Lumosity Premium, you will work out with a personalized training program, unlock in-depth insights about how you play, and receive tips for better game accuracy, speed and strategy. Lumosity Premium subscriptions are charged through your iTunes account upon confirmation of purchase. Your subscription will automatically renew at the price and period selected above unless you turn off auto-renewal at least 24 hours before the end of the current period. You will be charged for renewal within 24 hours prior to the end of the current period. You may manage your subscription and turn off auto-renewal in your iTunes account settings after purchase. Refunds are not provided for the unused portion of any term, and any unused portion of a free trial period will be forfeited when a purchase is made. Privacy Policy: https://www.lumosity.com/legal/privacy_policy Terms of Service: https://www.lumosity.com/legal/terms_of_service Payment Policy: https://www.lumosity.com/legal/payment_policy California Privacy Policy: https://www.lumosity.com/en/legal/privacy_policy/#what-information-we-collect
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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 after initial games
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Repetitive gameplay can lead to boredom
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchases can be misleading
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of personalized training plans
Validate with people who use this workflow before building.
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.