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.
The internet
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 Firefox Fast & Private Browser: map the core Utilities 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 report slow performance during heavy browsing.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Privacy features can be confusing to set up.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Limited customization options for the UI.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficulty in managing multiple tabs efficiently.
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.
The internet. As it should be. Firefox is a fast, private web browser designed to protect you by default. Privacy is built in from the start, so you can focus on what matters instead of worrying about who’s watching. Why people choose Firefox: • Enhanced Tracking Protection – Blocks trackers by default to help stop companies from following you across the web. • Private browsing mode – Browse without saving your history, searches, or cookies. • Page summaries – Get the key points from long pages and move on faster. • Built-in password manager – Generate strong passwords, save them securely, and autofill logins when you need them. • Flexible search options – Choose your default search engine or switch search engines right from the search bar. • Reader Mode – Remove ads and clutter from articles so you can focus on what you’re reading. • Sync across devices – Pick up where you left off with synced tabs, bookmarks, and passwords when you sign in to your Mozilla account. Private by default Firefox is designed with privacy built in from the moment you start browsing. Enhanced Tracking Protection automatically blocks common background trackers, including social media trackers, crypto miners, and fingerprinters. When you want extra privacy, private browsing mode doesn’t save your history, searches, or cookies. Focus on what matters The web can be distracting. Firefox is designed to help you stay focused without making you manage everything yourself. Reader Mode clears clutter from articles, and picture-in-picture keeps videos visible while you multitask—without pulling focus from what you’re doing. Browse your way Customize Firefox to fit how you browse. Personalize your home screen with wallpapers and layout options, and choose your preferred search engine instead of being pushed into a single ecosystem. You can move the search bar to the top or bottom of the screen for easier one-handed browsing. Sign in to your Mozilla account to sync tabs, bookmarks, passwords, and browsing history across devices, so switching feels seamless. Built for people, not profit Firefox was created in 2004 by Mozilla as a faster, more private, and more customizable alternative to other browsers. Today, Mozilla remains a nonprofit and continues working to make the internet — and the time you spend on it — better. Learn more about Mozilla: https://www.mozilla.org Terms of Use: https://www.mozilla.org/about/legal/terms/firefox/ Privacy Policy: https://www.mozilla.org/privacy/firefox Latest news: https://blog.mozilla.org
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.