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.
Tuner T1 Pro is the ultimate instrument tuner, designed for precision tuning of a wide range of musical instruments
$4.99 · 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 Tuner T1 Pro: 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 instrument support
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Accuracy issues in noisy environments
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: User interface can be intimidating for beginners
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: No social sharing features
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.
Tuner T1 Pro is the ultimate instrument tuner, designed for precision tuning of a wide range of musical instruments. Whether you're tuning a guitar, violin, viola, bass, piano, cello, flute, or any other instrument, Tuner T1 ensures impeccable accuracy and ease of use. Ideal for both professional musicians and beginners, this chromatic tuner app is built to handle all common instruments with incredible precision, making it an essential tool for any musician. Now Available on Apple Watch! Tune directly from your wrist using the Apple Watch version, which features a fully functional chromatic tuner calibrated to standard A4 = 440 Hz. The watch app also includes a built-in tone generator, making quick tuning and pitch reference more accessible than ever. Key Features: • Extremely Accurate Tuning: Tune your instrument with an exceptional level of accuracy (within ±0.1 cents), ensuring perfect pitch every time. • Chromatic Tuner for All Instruments: Tuner T1 supports a broad range of instruments, including guitar, bass, violin, viola, cello, piano, flute, and more. Whether you're tuning strings, winds, or brass, Tuner T1 has you covered. • Tone Generator: Generate reference tones over a 3-octave range. Perfect for ear training or manual tuning when needed, the tone generator covers every note you need. • Adjustable A₄ Frequency: For those who need custom tunings, Tuner T1 allows you to change the A₄ reference frequency from the standard 440 Hz to other frequencies to suit any musical or regional style. • Customizable Detection Latency: Adapt the app to your specific needs by adjusting pitch detection latency. Lower latency settings allow for quicker pitch detection, ideal for fast-paced vocal practices. Higher latency settings help filter out unwanted noise and momentary sounds, providing stable tuning results—especially useful for precise instrument tuning. • Beautiful, Simple, & Easy-to-Use Interface: Tuner T1 is designed to be intuitive, allowing you to start tuning instantly without any complicated setup. It’s built with simplicity in mind while maintaining all the advanced features you need for professional-grade tuning. • Perfect for Professional and Amateur Musicians: Whether you're a professional musician performing on stage or an aspiring player honing your skills, Tuner T1 provides the accuracy and reliability you need to ensure your instrument is perfectly in tune every time. • Optimized for Low-Latency Performance: Our app delivers low-latency pitch detection, ensuring quick response times without sacrificing accuracy, making it a great tool for live performances or recording sessions. • Battery-Efficient: Tuner T1 is designed to minimize battery consumption, letting you use the app for extended tuning sessions without draining your device’s power. Why Choose Tuner T1? Tuner T1 stands out from other tuning apps because of its superior accuracy and low-latency pitch detection, specifically optimized for tuning a wide variety of common instruments. This app is built to cater to the needs of guitarists, violinists, pianists, and other musicians across different genres. With its sleek interface, customizable settings, and tone generation capabilities, Tuner T1 is not only powerful but incredibly user-friendly. Unlock Your Musical Potential With Tuner T1, you’re not just getting an ordinary tuner. You’re getting a tool that helps you achieve perfect pitch, fine-tune your ear, and enhance your performance. Whether you're practicing, recording, or performing live, Tuner T1 gives you the professional-level tuning accuracy you need. Download Tuner T1 Pro today and experience the next level of tuning accuracy for all your musical instruments!
Written user reviews are not shown here. Check current App Store reviews >
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.