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.
Pure Strings is an inspiring professional iOS app that allows musicians to transform their iPhone or iPad into a richly expressive string instrument
$29.99 · 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 Pure Strings Instrument & AUv3: 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 instrument selection compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: High price point for a niche market
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Complex user interface for beginners
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Inconsistent audio quality on different devices
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.
Pure Strings is an inspiring professional iOS app that allows musicians to transform their iPhone or iPad into a richly expressive string instrument. With nine expertly sampled articulations and textures, it offers a wide range of string ensemble options. At its core is the Morphpad, a touch-sensitive interface that allows seamless blending and shaping of sounds. Simply slide your finger to explore and morph through a variety of string sounds and effects. Pure Strings combines the high-quality sound typically associated with desktop virtual instruments with the intuitive, tactile experience of mobile devices, delivering an expressive, versatile and responsive instrument. Pure Strings responds fluidly to your creative impulses. Swipe across the Morphpad to blend, mix and layer string tones with simple finger movements. Whether you're exploring classic sounds or venturing into modern sonic landscapes, the app provides a large variety of strings sounds, including sustain, pizzicato, staccato, harmonics, trills and tremolo articulations, as well as string machine, synth and vintage tape string sounds. Pure Strings lets you access the full dynamic range - from soft piano to bold fortissimo - not only through keyboard velocity, but also through the Dynamics Strip next to the Morphpad, Mod Wheel or automation. In addition, the built-in arpeggiator transforms chords played with short articulations into synchronised arpeggios that follow your host tempo, adding an extra dimension of musical expression. Customise your sound with control over attack and release time, or shape your tone with the Con Sordino button, which softens the sound to create a uniquely mellow and emotional atmosphere, replicating the effect of a mute used by string players. To further enhance your sound design options, Pure Strings includes a versatile EQ, high-quality reverb and a delay effect that syncs to the host tempo. These effects morph seamlessly as you explore the Morphpad, but they can also be set as master effects by disabling the Morphpad control, giving you even more flexibility in sound design. Pure Strings works as a standalone app or as an AUv3 plug-in within your favourite iOS DAW. Whether you want to open the app in standalone mode using USB, standard MIDI, network or Bluetooth MIDI connections, or integrate it as an AUv3 plug-in into music apps such as Logic Pro, GarageBand or Cubasis, Pure Strings offers connectivity and integration across a wide range of workflows. Feature Overview: • Interactive Morphpad - morph, blend and mix string sounds with simple finger movements • Nine different sounds - navigate between nine core string sounds: sustain, pizzicato, staccato, harmonics, trill, tremolo, string machine, synth, vintage tape string • Extensive Connectivity - Connect via USB, direct or Bluetooth MIDI, Inter Device Audio (IDAM), Network MIDI • Standalone and AUv3 plug-in compatible - Plug and play or use within your favourite music production software • Multiple dynamics control options: velocity, on screen dynamics strip, modwheel, automation • Arpeggiator for short articulations - transforms chords into synchronised arpeggios that follow your host tempo • Con Sordino button - soften the sound to create a mellow and emotional atmosphere, replicating the effect of a mute used by string players • Zynaptiq QREV Reverb - Add extra atmosphere and depth to your sound • 3-Band EQ and Delay - Get creative with customisable EQ and temposynced Delay effects • Attack and release envelope control • Studio Quality Audio at Ultra-low Latency • Save and Load Your Own Presets - Wherever you land on the Morph Pad, if you like the sound you hear – save it and recall it again later • Customisable velocity curve • Transposition and tuning options • 24-bit, 44.1 kHz • 905MB installation
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.