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.
For musicians from pros to beginners, whether you sing, play a brass, woodwind or stringed instrument or any type of guitar, this app provides a set of feature-rich practice tools that gives fun and rewarding feedback
$6.99 · In-app purchases
Evidence scope: #21 is the current overall US Paid chart position. 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 TonalEnergy Tuner & Metronome: 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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Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
For musicians from pros to beginners, whether you sing, play a brass, woodwind or stringed instrument or any type of guitar, this app provides a set of feature-rich practice tools that gives fun and rewarding feedback. It’s much more than just a tuner! So what makes the TonalEnergy the best selling music practice app? • It's an all-in-one app, with a state-of-the-art tuner, an advanced metronome, dedicated orchestral strings and guitar tuning page, a piano keyboard, sound analysis pages, and audio/visual recording capabilities. • It’s easy to use. Options like the Target Tuner or Pitch Tracker are on all the main pages. TonalEnergy helps users create rewarding and attainable goals during a rehearsal or when working alone. Colorful analysis data pages and audio/video recording features enhance the experience of practice. • The metronome is cutting edge. It offers unmatched flexibility in sound choices, tempo settings, meters, subdivision patterns and visual displays. Voice count-ins, the ability to create and edit preset groups and Ableton link for syncing multiple devices make this a superior tool for performers. • Ear training possibilities are endless. The high quality multi-sampled instrument sounds for symphonic instruments are unique among all other tuning applications. Listening skills can be developed through the use of the eight-octave keyboard, chromatic wheel and tone generator. There are no other sounds like these. • Learning is a social activity. Using features unique to the TonalEnergy Tuner, data can be collected, reviewed, edited and shared with others. Feedback is essential for growing and developing great performers. It’s all about connectivity. Chris Coletti, member of The Canadian Brass, sums up TonalEnergy by saying, “TonalEnergy is a must-have for any serious musician. It's a full suite of tools in one app; the tuner, tone generator, recorder, metronome and beautiful interface make it one of the best tools for musicians out there, period.” FEATURES • Recognizes a large pitch range, extending to lower registers than many competing tuners (C0 - C8) that is highly responsive to wind instruments, as well as acoustic and electric string instruments • Adjustable A=440 Hz reference • Automatic or manual transposing options • Instantly changes between equal, just and other custom temperaments, including user-defined ones • Auto or instant pitch reference note feature using the TonalEnergy sounds • Extensive tuning list for all orchestral string and fretted string instruments including many more features than most other string-only tuner apps • An expandable eight octave piano keyboard enhancing many of the key aspects of the tuner’s functions • Chromatic wheel tone generator, with optional auto-vibrato feature • Frequency and Harmonic energy overtone graphs, along with a multi-function waveform • Dedicated metronome page that matches or exceeds the features available on all other stand alone metronome apps • Notation options including standard English, Solfege, Northern European, and Indian variants • Bluetooth output/input support • Audio and Video recording capabilities including, editing, looping, timestretch that are all exportable via iTunes sharing, AirDrop, email, AudioCopy, SoundCloud, etc • Import music from iTunes Library or email attachments • Compatible with external microphones and clip-on vibration sensor devices • Supports external video output to an external display for use in rehearsal halls • External MIDI keyboard control support • Apple Watch app acts ONLY as a remote control for the phone app • Audiobus and inter-app audio support • VoiceOver support for the blind or visually impaired INSTRUMENT SOUNDS • Piccolo, Flute • Oboe, English Horn, Bassoon • Full Clarinet Family • Soprano, Alto, Tenor, and Baritone Saxophone • Trumpet • French Horn • Tenor and Bass Trombone • Euphonium and Tuba • Square, sawtooth, and sine waveforms • Organ • Bowed and Plucked Strings
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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: Lack of advanced features like visual aids for tuning
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited customization options for metronome sounds
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Difficulty for beginners to understand tuning modes
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Occasional bugs leading to crashes on older devices
Validate with people who use this workflow before building.
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.