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 Busuu: Language Learning App: 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.
Busuu helps you communicate with confidence from day one. Combine expertly designed language lessons with feedback and tips from our global community of native speakers and harness the power of learning together. Looking for the best way to learn a new language on your phone? You’ve just discovered it, with Busuu, a Chegg service – we’re the app that makes learning new languages easier, more fun and more effective for all. Whether you’re learning to get confident having new conversations, for a higher grade, a career boost, or for mind-blowing travel experiences, Busuu’s got your back. We’re already helping millions of people overcome their learning struggles, from lack of time and motivation to problems with grammar and vocab. We help our learners achieve their goals, one milestone at a time – and we want to do the same for you. DOWNLOAD THE APP NOW FOR FREE LANGUAGE LEARNING ================ How are we doing this? We’re glad you asked. Whether you’re learning on your iPad or iPhone, Busuu helps you… – Learn up to 14 languages That’s right, 14! We’ve got complete courses in English, French, Spanish, Italian, German, Chinese, Korean, Japanese, Portuguese (Brazilian), Polish, Russian, Arabic, Dutch or Turkish with Busuu. – Master languages with real people You want to learn the relevant language, right? You’re in luck: we’ll connect you with our community of native speakers so you can get localized language knowledge and support. Feel even better when you help other learners in return. – Learn from the experts Busuu’s online courses are created by our ingenious language experts. Learn step-by-step with bite-sized lessons, plenty of practice and lots of opportunities to test your progress. – Say hello to useful language skills Learn the language that will really take you places! With regularly updated content, video flashcards featuring real people and useful cultural tips, you’ll be fully immersed in no time. – Kiss goodbye to stressful timetabling We’re serious. We organize your learning time for you with a personalized Study Plan. Simply tell us when you want to study and for how long, and we’ll send you notifications to keep you on track. – Revise with ease There’ll be no forgetting on our watch. Smart Review cleverly saves all the grammar and vocab you learn in lessons and stores them in one handy place, so you can make those tricky words and rules stick. – Show off achievements with official certificates With our Busuu language certificates, you’ll have actual proof of your language capabilities. – Access specialized courses for language lovers You’ve learned the basics, and now you’re hungry for more. Learn about manga, advance your pronunciation or add travel-specific phrases to your skillset, plus much more. ================ DON’T JUST TAKE OUR WORD FOR IT. See what others have to say about Busuu: ● EDITOR RATING: EXCELLENT - PC MAG ● Named 'Best Buy' language learning app by the Independent in 2021 ● Language Learning App of the Year at the EdTech Breakthrough Awards 2020 ================ PLEASE NOTE A lot of the features are free, but you will need a subscription in order to get access to all features of this app. Your subscription will automatically renew unless auto-renew is turned off at least 24-hours before the end of the current payment period. Your iTunes account will be automatically charged at the same price for renewal within the 24-hour period prior to the end of the current payment period unless you change your subscription preferences in your Account Settings. You can manage your subscriptions through your Account Settings after purchase. Privacy policy: https://www.busuu.com/en/privacy/ Terms of Service: https://www.busuu.com/en/terms/
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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 compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Community feedback can be inconsistent in quality.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Navigation can feel cluttered with too many options.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases can be confusing.
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.