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.
Yarn Loop is a relaxing and satisfying puzzle game featuring colorful yarn bobbins and knitted patterns.
Free · In-app purchases
Evidence scope: #98 is the current overall US Grossing chart position. 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 Yarn Loop: Knit Puzzle: map the core Games 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.
Yarn Loop is a relaxing and satisfying puzzle game featuring colorful yarn bobbins and knitted patterns. Bobbins move onto the conveyor and collect stitches of their own color. Each bobbin has a capacity value that decreases as stitches are picked up. When its capacity reaches zero, the bobbin disappears. If capacity remains, the bobbin is transferred to the rack and can be used again later. Complete each knitted pattern by using the right bobbins in the right order. Game Features ► Simple One-Tap Gameplay: Bobbins move smoothly through the conveyor system and collect matching stitches with ease. ► Color-Based Collection Mechanic: Each bobbin clears only the stitches of its own color. ► Capacity Management System: Every bobbin has a limited pickup value, creating thoughtful and satisfying puzzle decisions. ► Rack Reuse Function: Bobbins that still have capacity return to the rack and remain available for later use. ► Hundreds of Engaging Levels: New knitted layouts, color combinations, and puzzle arrangements appear throughout progression. ► Cozy Yarn Aesthetic: Soft textures, warm colors, and pleasant animations create a calm and enjoyable experience. Yarn Loop offers a smooth, calm, and visually charming journey through handcrafted yarn puzzles.
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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 levels can lead to boredom.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Ads can disrupt gameplay.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficulty scaling may frustrate players.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social features to challenge friends.
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.