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.
Advanced groove library and drum learning tool for all levels.
$12.99 · 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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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 Drum School: 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 interactive features for practice exercises
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High subscription cost compared to competitors
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of community features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No offline mode for all lessons
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.
Advanced groove library and drum learning tool for all levels. Whether you're a beginner or a pro, Drum School is the perfect tool for advancing and expanding your skills. With a large selection of grooves, exercises and practice ideas, Drum School will continue to take you to the next level. It is also the perfect tool for easy access to a large library of professional sounding grooves for play along and as a reference library. Included styles: Rock, Rock'n Roll, Alternative Rock, Heavy Metal, Punk, Blues, RnB, Hip Hop, Funk, Reggae, Ska, Disco, Drum'n Bass, House, Techno, Country, Bluegrass, Jazz, Swing, Dixieland, Ragtime, Fusion, New Orleans, Tango, Bossa Nova, Samba, Afro Cuban, Soukous, Calypso, Waltz and many more. ~ Featured in Modern Drummer and DownBeat Magazine ~ Drum School is divided in five main sections: Grooves, Practice, Technique, Hits and Favorites. - GROOVES - This is the main section of Drum School with over 300 drum grooves in many different styles. Each groove comes with: - Standard drum notation with high quality graphics in portrait or landscape mode. - High quality audio made from real drum samples that loop for play along practice. - Variable tempo range of 30 to 300 bpm without any loss of audio quality. - Audio isolation of what each limb is playing, allowing the student to break down the groove into its basic components, learn them separately, and finally put them back together in various combinations. - Bass lines that help learning and experiencing the relationship between the drums and the bass in each style in a fun way. - High quality video performance by the author of the app, established and world renowned drummer, Ferenc Nemeth. The video speed can be adjusted and the more advanced grooves come with an extra video at a slower tempo. - Multiple drum fills that can be practiced individually or in conjunction with the groove in 2, 4 or 8 bar phrases. - Color coded indication of difficulty level from 1 (easy) to 6 (hard). - Ability to mark the groove as completed so you can better track your practice progress. - Detailed description of performance details, learning tips and historical notes about each style. - PRACTICE - The practice section includes 145 drum exercises divided into: Basic Rudiments, Rolls, Flams, Drags, Hand Exercises and Coordination. Each exercise comes with: - Standard drum notation with high quality graphics in portrait or landscape mode. - High quality audio made from real drum samples that loop for play along practice. - Variable tempo range of 30 to 300 bpm without any loss of audio quality. - Audio isolation of left and right hand. - High quality video demonstration with adjustable speed. - Detailed descriptions of performance details and learning tips. - TECHNIQUE - This section includes 12 video demonstrations of basic drum technique for hands and feet. Each video is accompanied by a detailed description and learning tips. - HITS - This section includes classic Pop, Rock and Funk hits. Each groove comes with the same features as the "Grooves" section. - FAVORITES - This is where you collect your favorite grooves and the ones you are currently working on. Visit the support website for a video demonstration.
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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.