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.
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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 Fox Issue & Project Tracking: map the core Developer Tools 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: Users often find it difficult to manage multiple issues at once.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited filtering options available.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: The onboarding process can be confusing for new users.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of collaboration features.
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.
Fox gives your work a structured place to live. Built for solo developers and small teams, it organizes everything around the versions you're shipping and the milestones that get you there—turning scattered tasks into a clear path to delivery and helping to ensure nothing is left behind. Fox offers several ways to buy: a lower-cost subscription, or a one-time lifetime purchase. Your purchase grants universal access on Mac, iPad, and iPhone. # Stay Focused on What Matters Fox helps you organize work that's outgrown todo apps and notes. Break down your projects into clear, actionable issues. Group them into milestones and versions to track goals and align releases. Track progress on a flexible Kanban board. It's everything you need to focus on your work. # Keep Your Projects On Track - A simple concept: Projects to organize your work, Milestones for goals, and Versions to deliver – Organize issues into a hierarchy that matches how you think and work - Comprehensive Issues – Track everything from simple tasks to complex features with subtasks, estimates, actual effort, due dates, links, and even more. Comprehensive history shows how Issues have developed over time - Flexible Kanban Board and Outline View – See your work the way you need to — boards for flow, outlines for the bigger map. - Rich Markdown Notes – Write detailed descriptions with code blocks, inline images, and links between issues - Resolution Tracking – Mark completed work with resolution status and notes for future reference - Smart Organization – Customizable issue types, tags, statuses, and priorities that adapt to your workflow and can be customized per project # Working in a team? Collaboration tools to support. - Unlimited collaborative project sharing - Get access to additional tools like history attributions and issue assignment # MCP Support for LLM Integration (macOS only) - Integrate with Claude Code, Cursor, any other HTTP-streamed, MCP-supported tools - Plan, track, and update issues, versions, and milestones - Use Fox as an overhead client to work with LLMs # Work Anywhere, Stay in Sync - Robust iCloud Sync – Seamless sync across all your devices keeps your work accessible everywhere - Native on Mac & iOS – Full-featured apps built specifically for each platform, including a desktop-class and full-freatured iPad app # Even More to Explore - CSV Import & Export – Migrate from other tools or bulk-create issues effortlessly - Bookmarks – Mark important issues for quick access - Issue History – Track every change made to issues over time - Archive System – Keep completed versions and milestones accessible without cluttering your workspace - Powerful Search & Filters – Find exactly what you need, when you need it - Shortcuts Integration – Automate workflows and create issues from anywhere on iOS ——— Fox is a labor of love and we hope you’ll love it, too. You can learn more at https://contagious.dev/fox ——— * Fox for single users is available through a subscription ($3.99 USD per month, special saving on yearly subscription) or one-time purchase. Users who purchased prior to 3.0.0 gain access to all features for free. * A one-time free trial of 14 days is offered free of cost with first subscription selection, after which the subscription-tier selected will be renewed. Subscriptions automatically renew unless explicitly canceled. Subscriptions may be managed and auto-renewal can be turned off in your system’s Settings. * Any prices shown are in USD and may vary by region. ——— Privacy Policy: https://contagious.dev/privacy-policy/fox/ Terms of Use: https://contagious.dev/terms-of-use/fox/
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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.