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.
Xynthesizr is a streamlined yet capable 32-step matrix sequencer/monotimbral synthesizer with generative features and MIDI.
$6.99 · 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 Xynthesizr: 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: Complexity of the grid interface can be overwhelming for new users.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited instrument options compared to competitors.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Occasional performance issues during playback on lower-end devices.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Lack of social sharing features to share patterns with friends.
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.
Xynthesizr is a streamlined yet capable 32-step matrix sequencer/monotimbral synthesizer with generative features and MIDI. "This really is a lot of fun and, hooked up to a synth like Thor or Z3TA+, there are plenty of creative options to be explored here." - John Walden, musicappblog.com "Xynthesizr is about the only tone matrix app that can keep up with my short attention span. There are so many ways to shape, and constantly reshape, your sound... There's a lot to play with here!" - Tim Webb, discchord.com "Overall, Xynthesizr is a very interesting instrument that is fun to play and lovely to look at." - Tom Flint, Sound on Sound "Xynthesizr holds a lot of creative potential, and between a user friendly interface, a practical onboard synth, inspiring generative features, and solid MIDI implementation, this is a useful tool that can really benefit a wide range of iOS musicians." - Chip Boaz, iosmusicandyou.com "...one of my absolute go-to apps" - Sean Garland, iosmars.com Create patterns and modify them in real time, or let Xynthesizr do it for you using its morphing algorithms. Change scale and key, or transpose within a scale on-the-fly. Tweak parameters of the internal synthesizer or output MIDI to your favorite apps and devices. Record and share your creations. General features: ◦ MIDI support for syncing and sending notes to synths, samplers and drum machines ◦ Notes to MIDI channel mapping for driving multiple apps or devices simultaneously ◦ MIDI input to control transposition with note messages and synthesizer/sequencer parameters with CC messages ◦ Ableton Link support ◦ Audiobus 3 support ◦ Inter-App Audio support ◦ 40+ bundled presets ◦ Save, export and import your own patterns and presets ◦ Record and export audio Sequencer features: ◦ Gestures to easily edit patterns on-the-fly ◦ [Conway's Game of] Life-like cellular automata and probability-based pattern morphing ◦ Limit pattern morphing to a selected area of the grid ◦ Variable tempo, step length subdivision and pattern length ◦ Variable velocity per step ◦ Selectable keys and scales with ability to transpose in real time ◦ An option to tie consecutive notes of same pitch to make longer notes ◦ Shift and flip patterns ◦ Create and use your own scales and Life-like cellular automata rules ◦ Color-coded octaves Synthesizer and FX feature: ◦ 32-bit floating point sound engine ◦ 16 voice polyphony ◦ 2 antialiased oscillators per voice ◦ 4 waveforms (sine, triangle, sawtooth, square) ◦ 4-pole (24 dB/oct) low-pass resonant filter ◦ 2 ADSR envelope generators (amplitude and filter cutoff frequency) ◦ 2 LFOs to modulate 4 selectable LFO targets (filter frequency, pitch, amplitude, second oscillator detune) ◦ Stereo delay, reverb and randomized panner
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.