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.
do you want to learn to play violin or fiddle?
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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 Learn & Play Violin - tonestro: map the core Music 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 offline capabilities for lessons and exercises
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Not enough interactive feedback during practice sessions
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Subscription model can be confusing for users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficulties in navigating through content
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.
do you want to learn to play violin or fiddle? simply download the app and start learning now! tonestro will help you to learn violin in a fast and fun way! why learning instruments such as violin & fiddle with the tonestro app is fun and effective? firstly, bite-size violin lessons! we’ve created short lessons and exercises matching your pace of learning. all violin lessons are tailored by music teachers and include: - music theory, - music notes, - violin tabs, - violin fingerings, - sheet music. it’s like having a music teacher at your side. with exercises, you learn music theory, rhythm & pitch and with exams, you check your progress. secondly, it’s like playing a game! during all lessons, you collect points for learning, practising, and consistency. weekly challenges with songs give you the extra motivation to improve your instrument skills and persist with lessons. beat high scores and compare yourself with other violinists! thirdly, learn by playing songs you simply love! dive into our sheet music library with hundreds of songs. all tracks are studio-quality background music (play-along songs). it makes practising with an instrument fun. our sheet music library is updated with new songs every week. you will learn violin songs with the interactive sheet music library in no time! is there more? learn violin or fiddle with live feedback! grab your instrument and start a violin lesson, continue your practice or learn a new skill. while you learn how to play a song, our technology analyzes the sound of your instrument in real-time. when you play the wrong notes, we’ll help you get back on track. you receive instant feedback on pitch and rhythm, presented in an easy-to-understand way. it all happens instantly while you play, practice, or learn with a real instrument. you learn just like with a teacher! it is hard to learn or play while out of tune. we’ve got this covered! no matter the instrument you learn, we’re providing you with a tuner! tonestro chromatic violin tuner provides high-precision tuning. during your first violin lessons, we will show you how to get in tune with a chromatic violin tuner quickly. are you a beginner musician and need help learning to play the violin? tonestro violin lessons app covers: - easy-to-follow lessons, - practice songs, - chromatic violin tuner, - using a metronome, - using instant feedback on pitch and rhythm, - reading music notes, - fingerings, - exercises - game experience - sheet music library - making the most of play-along songs! with tonestro violin lessons, beginners can learn and progress very fast. what about advanced violinists who want to keep practising with a real instrument? tonestro violin lessons app has you covered! our interactive sheet music library, fingering tutorials, more complex exercises, or faster melodies are there for you! such as a chromatic violin tuner, or metronome! do you have a problem with a tonestro violin lessons app (violin lessons, chromatic violin tuner, sheet music library, metronome)? contact us! tonestro requires a subscription to access the entire learning content and song library. each subscription plan may include a 7-day free trial period. terms: https://www.tonestro.com/terms privacy policy: https://www.tonestro.com/privacy
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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.