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.
Welcome to Dual-N-Back, a cognitive game scientifically proven to improve working memory
$0.99 · 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 Dual-N-Back: 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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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 game variations can lead to user boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of social features reduces engagement.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: The app may not provide sufficient feedback on performance.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: High friction to convert free users to paid.
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.
Welcome to Dual-N-Back, a cognitive game scientifically proven to improve working memory. The game is fairly simple to learn, but it can get quite challenging as you get to higher levels. The philosophy of this app is to provide a clean and minimalistic interface for the game Dual-N-Back, whilst providing additional functionality to help users improve as fast as possible and understand their tendencies. Some Features Include: - Game history, with full information on your Correct answers, Misses and False Alarms. - Trial history, for the games that you have recently played. You will be able to view the squares that showed up, as well as which letters were said. You can also view which buttons you pressed to see where you went wrong. - Replay round, allowing you to play a round you previously played, with the same squares on the grid, with the same letters which were said. - Gameplay customisations, such as quadratic or linear trial numbers, trial duration, automatic N-level adjustments. - Aesthetic customisations, such as light or dark mode, and accent colours. - Note: this application does not make any connections to external servers, and all your information will be kept locally for privacy sake. It will not make any notifications and has zero advertisements and subscription based services.
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.