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.
Tonaut is a synthesizer, drum machine, sequencer and eight-track tape recorder in one instrument, made to be played rather than programmed
$14.99
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.
Your first Build Kit is free with a verified email.
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 TONAUT: 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.
Tonaut is a synthesizer, drum machine, sequencer and eight-track tape recorder in one instrument, made to be played rather than programmed. Pick a sound, tap out a pattern and record it to tape, all on one panel that feels more like hardware than an app. IPHONE DUO • Folded, one octave on the outer screen. Half folded, the screens above the keys. Open, the whole instrument. Folding never stops the music SOUNDS • Nine synth engines: virtual analog, six-operator FM, wavetable, pulse, modeled string, a seven-oscillator swarm, grains, a classic analog poly and a sampler • Every engine has a 3D screen that moves with your playing, or a classic view • Over 500 sounds, from warm pads to glassy bells and growling bass, including 147 sampled instruments • Edit every sound in depth, save your own, and star your favorites • Load DX7-style SysEx banks into the FM engine • Four effects on every sound from sixteen types, from tape echo and huge reverb to distortion, pump, phaser and lo-fi • A master effect, a master EQ and an EQ on every lane DRUMS • 43 kits on three drum engines: kits made from real recorded drums, synthesized kits where every pad is its own drum, and slice kits • Knock and Cinder kits drawn in 3D, moving with every hit • A groove player: hold any pad and the whole kit plays one of sixteen grooves • Make kits from your own recordings or from audio files, one per pad KEYS AND CHORDS • Pick a key and scale and its keys light up; LOCK keeps every note in key, per lane • CHORDS plays a whole chord from one key, and works with the arpeggiator and the sequencer • Chord pad: seven chords from your key and a stick that turns each into a 7th, 9th, sus, dim and more, with strum and bass, also from a MIDI keyboard SEQUENCER • Eight lanes, each with its own sound and sixteen patterns of up to 64 steps • Write step by step or record live, with chords, slides, ratchets and chance • STEP REC: each note or chord you play fills a step, with rest and tie, also from MIDI • Pattern Play: queue the next pattern and every lane moves on together • Copy, swap and transpose patterns, and reorder lanes • An arpeggiator on every synth lane PLAY IT LIVE • A Perform page with TONE and SPACE for every lane, which glide back when you stop • An X/Y pad that bends pitch and moves the sound under one finger • One-tap mutes, tap tempo, click and count-in TAPE • Eight tracks of 20 minutes each, or six tracks of 30 minutes, chosen per project • Record every lane to its own track, or several onto one • Loop, reverse, stutter, brake and catch the last 30 seconds you played • A tape mixer, and pinch to zoom from a few bars to the whole song SAMPLING • Sample with the microphone, a USB interface, or Tonaut itself • Link your sample folders once, tap a file to hear it, and load it onto a pad or into the sampler • Drag audio files in from other apps onto a drum pad or the sampler MIDI • Play Tonaut from USB or Bluetooth MIDI keyboards and controllers, on the selected lane or with each lane on its own channel • Send any lane to your own synths and drum machines, with clock and start/stop SHARE AND EXPORT • Share a loop from the tape as a vertical video or as audio, ready to post • Send a whole song, samples and all, as one file a friend opens in Tonaut • Export a stereo mix, separate stems as WAV files, or MIDI files of every lane • Optional iCloud sync between your iPhone and iPad One purchase covers iPhone, iPad and iPhone Duo, each with its own layout, in six looks: Light, Dark, TN-1, TN-1 Dark, TN-XY and TN-SIGNAL. No subscription, no account, and Tonaut collects no data. Your music stays yours. REQUIREMENTS • An iPhone with an edge-to-edge screen: iPhone XS, XR or newer, iOS 17 or later. Not the iPhone SE (its screen is too small) • iPad (6th generation), iPad mini (5th generation), iPad Air (3rd generation), iPad Pro (2017) or newer, iPadOS 17 or later Questions? Write to [email protected] or visit tonaut.app.
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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: Can't play offline
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Algorithm doesn't understand taste
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Shuffle-only on free tier
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.
Not assessed in a Build Kit yet.
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.