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.
Earworm is a music prediction effect for professional performers.
$64.99 · 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.
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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 Earworm: map the core Entertainment 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: Inconsistent audio recognition accuracy
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited song database compared to competitors
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline functionality
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of user customization options
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.
Earworm is a music prediction effect for professional performers. Here's what happens: - You ask a friend to take out their phone, mute the volume and open YouTube. - You then take your friend's phone and play a song, giving the phone back with its screen facing downwards. - Now you apparently mentally transmit the thought-of song to your friend. - Your friend names *any* song, turns the volume up on their phone and looks at the screen to hear and see that your prediction was correct... that exact song is playing on their phone! The entire effect happens on their phone. Earworm is built for real-world performance. It gives you multiple advanced input methods, flexible reveal options, and powerful integrations so you can adapt the routine to your style, language, and audience. Everything can be inspected afterwards, with nothing suspicious to find. Features include: - Predict songs, music videos, trailers, or almost any searchable video - Multiple input methods, including voice and covert browser input - Performable in multiple languages - No accomplice required - No memory work - Integrations with many third-party magic apps - Notification support for additional confirmation And with Earworm Pro: - Supports Bluetooth peek devices, including the PeekSmith and Lumen Duo as part of Earworm Pro - Never touch their phone with Earworm Remote - Enhanced input methods Earworm Pro is an optional purchase that brings even more advanced performance tools, including: Enhanced Voice input - Automatically detect songs mentioned in conversation. - Uses your own funded AI account and API key for best-in-class recognition. - Black mode offers a covert input with vibration cues. Earworm Remote v2 - Perform Earworm without touching the spectator's phone. - A new, even more natural way to share your video link. - Auto Redirect and WikiTest integration for pairing and redirecting. Send To Earworm - Allow supported third-party apps to submit to Earworm, letting you reveal a freely chosen song via their input methods. Peek Device Support - New support for compatible peek devices. - Live Peek support for the Notes input (to make it seem that you really did predict the chosen song!) - Native PeekSmith and Lumen Duo support is built into Earworm Pro Earworm is designed for performers who want a practical, modern, impossible-looking prediction effect. Video and audio broadcasting of any description (including TV, radio and Internet) of this effect is prohibited without the written consent of its creator.
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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.