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.
Benny Greb, well known for his contributions to the drumming education community, shared the approach he has taken to develop his sense of groove and improve his timing on his instrument in his course "The Art and Sci...
$2.99 · 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 Gap Click by Benny Greb: 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 sound options for click tracks
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: No ability to share click tracks
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Basic UI can feel outdated
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of integration with other apps
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.
Benny Greb, well known for his contributions to the drumming education community, shared the approach he has taken to develop his sense of groove and improve his timing on his instrument in his course "The Art and Science of Groove." Now with the Gap Click app, everyone can practice his method easily using this intuitive app! Unlike standard metronomes, which only provide time, Gap Click helps you improve your sense of time. Gap Click is more than a metronome that focuses on improving your ability to keep tempo, become more aware and comfortable with off-beat clicks, and become bulletproof and accurate with all notes of the subdivision. GAP CLICK By scrolling through the numbers of bars and patterns, you can quickly configure a "gap" of time in which the metronome drops out. When the "one" comes back around, will your playing still be in time? How long of a gap can you play through and still maintain a solid tempo? MOVING CLICK Next, you can experiment with all kinds of off-beat patterns in the Gap Bar, which moves the click from the downbeat position to a different location. Can you still play your instrument and maintain the downbeat internally even when you hear the click sound on an off-beat? Both the "click" and the "gap" portion supports various syncopated patterns, allowing you to practice in binary or ternary rhythms - with more or less safety depending on your settings. Features • Ability to choose from various syncopated patterns and the number of measures for both the standard "click" and the "gap." • Use the nostalgic click wheel to find the right tempo or tap to set your desired tempo from 10 to 300bpm • Standard quarter-note time signatures: 2/4, 3/4, 4/4, 5/4, 6/4, 7/4 • Support for VoiceOver ensures Gap Click is fully accessible to users with visual impairments Personalize • See visual feedback for each note or rest that the metronome plays • Accent beat 1 of each measure or turn accents off for a more significant challenge • Flash the screen for a visual indication when switching between the "click" and the "gap" sections • Find your favorite sound from a variety of click samples hand-picked by Benny Buy Once, Use Forever • There are no In-App Purchases - a one-time purchase includes all current and future features. TESTIMONIALS What professionals are saying about GAP CLICK: • "The skills you can sharpen by using this app are integral for what it takes to be a professional drummer in any genre." - Matt Halpern • "When I first opened the app, it made (simple) sense, without a tutorial." - Chris Coleman • "This app helps you lock in the pocket on a whole different level." - Luke Holland • "The Gap Click app is something that every drummer should have in their toolbox." - Jared Falk, Drumeo What our users are saying about GAP CLICK: • "If you think you have good timing, this will really put you in your place." • "Gone are the days of programming gap clicks!" • "I've never had so much fun being destroyed in my practice session." • "This is by far the best money I've ever spent on a practice tool." ABOUT BENNY GREB Benny Greb is one of the most respected drummers in the world today. Not only has he headlined nearly every major drum festival and toured with his clinics and drum camps worldwide, but he is also recognized as a composer and bandleader in his band Moving Parts, which won him the renowned "ECHO Jazz" award - the German equivalent to The Grammys in jazz. Benny Greb published two of the most successful and critically acclaimed educational products, "The Language of Drumming" and "The Art and Science of Groove," He has helped create many signature products available to drummers today. Find him online at https://www.bennygreb.de as well as on social media.
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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.