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.
Bass Tuner BT1 is a chromatic tuner, offering precision tuning for low-frequency instruments like bass guitar, double bass, cello, bassoon, bass clarinet, bass trombone, bass saxophone, and more
$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 Bass Tuner BT1 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 tuning options for different instruments
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Calibration can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: No offline capabilities
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of 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.
Bass Tuner BT1 is a chromatic tuner, offering precision tuning for low-frequency instruments like bass guitar, double bass, cello, bassoon, bass clarinet, bass trombone, bass saxophone, and more. This tuner is specifically built to handle the unique challenges of accurately detecting low-pitched notes. Bass Tuner BT1 combines a powerful tuning algorithm with an intuitive interface, delivering the ultimate tuning experience for bass-range musical instruments. Key Features: • Low-Frequency Optimization: Unlike standard tuners, Bass Tuner BT1 is designed to detect deep bass frequencies as low as A0 (27.5 Hz), making it ideal for tuning any bass instrument, from 4-string and 5-string bass guitars to wind and orchestral instruments. • Extreme Accuracy: Tune with confidence! Bass Tuner BT1 provides precision tuning with an accuracy of ±0.1 cents, making it a perfect tool for professional musicians who need their instruments to be perfectly in tune for studio recordings, live performances, and practice sessions. • Real-Time Pitch Detection: As you play, Bass Tuner BT1 instantly displays the current note, its frequency, and its deviation from the target pitch. This real-time feedback ensures you can tune to perfection every time. • Visual Pitch Graph: Gain a deeper understanding of your tuning stability with the live pitch graph, which visualizes your pitch over time, showing fluctuations and helping you achieve consistent, accurate tuning. • Tone Generator: Bass Tuner BT1 includes a tone generator that produces reference tones across a 3-octave range, perfect for those who prefer tuning by ear or need a reference pitch for tuning multiple instruments. • Custom A₄ Frequency: Set a custom A₄ frequency to suit your needs, whether you're playing baroque music or experimenting with alternate tunings. Bass Tuner BT1 allows you to tune to non-standard pitch values with ease. Why Bass Tuner BT1? Most standard tuners are designed for mid-range instruments, leaving bass musicians with inaccurate readings when trying to tune low-pitched notes. Bass Tuner BT1 solves this problem by focusing specifically on low frequencies, offering unmatched accuracy for bass instruments. Whether you’re a professional performer, a student, or a casual player, Bass Tuner BT1 makes it easier than ever to get your instrument perfectly in tune. Bass Tuner BT1 is extremely helpful in: • Live Performances: Quickly tune on stage with real-time feedback and extreme accuracy. • Studio Recording: Achieve pitch-perfect results with the high-precision tuning algorithm. • Practice: Visualize your pitch stability and improve your tuning accuracy using the pitch graph. Get the Best Tuning Experience: With a user-friendly interface and responsive design, Bass Tuner BT1 ensures you spend less time tuning and more time playing. Whether you’re tuning at home, in the studio, or on stage, this tuner provides the tools you need for fast, reliable tuning in any environment. Download Bass Tuner BT1 now and experience the difference!
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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.