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.
Tardigrain is a granular synthesiser for iOS that runs standalone or as an AU plugin
$5.99 · 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.
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Combine features and design from your favorite apps.
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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 tardigrain: 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 sound customization options compared to desktop DAWs
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High learning curve for new users
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Occasional crashes during playback
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Limited 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.
Tardigrain is a granular synthesiser for iOS that runs standalone or as an AU plugin. Sounds are created by taking smaller fragments of a sample and playing them back in a non linear fashion, with settings for grain size, direction, step size and more. Process the sound further through effects like reverb, wave shaper and sample crush. Tardigrain supports connections with AudioCopy, AudioBus, Inter App Audio and AUv3. Plus all audio parameters can be modulated by MIDI, as AU parameters and by aftertouch on the build in keyboard. Now also a selected set of parameters can be modulated by LFOs och notes triggered by a new sequencer/arpeggiator. +++ Record your own samples or import using AudioCopy/drag'n drop +++ Chromatic granualar playpack +++ Effects (Wave shaper, Reverb, Sample crusher, Pitch and stereo spread) +++ Resonant filter (low, band and high pass) +++ Keyboard and MPE modulation of any audio parameters +++ Note trigger sequencer/arpeggiator +++ 4 LFO sources for modulating a selected set of parameters +++ Multiple factory presets to get you started +++ Save and load your own settings and samples +++ Inter App Audio, AudioBus and AUv3 +++ Core MIDI, Inter App Audio MIDI and AUv3 MIDI
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.