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.
FRMS blends Granular, FM, Additive, and Subtractive synthesis in a powerful, flexible layering system
$8.99 · 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 FRMS - Granular Synthesizer: 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: Users find the sound loading times to be slow.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Limited sound library available for free users.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Some users report difficulty in navigating effects.
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: In-app purchases can be confusing.
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.
FRMS blends Granular, FM, Additive, and Subtractive synthesis in a powerful, flexible layering system. Create lush, evolving soundscapes or gritty, glitchy textures by combining up to four synthesis layers. With a sleek, intuitive interface, FRMS turns basic sounds into immersive audio experiences—from dense ambient drones to mechanical soundscapes. Choose from FRMS’s curated sample library, import your own sounds, or capture live audio for instant granulation. Shape unique sounds with layered synthesis, independent envelopes, modulation, and effects. Key Features: - 4 Synthesis Engines, 4 Layers Per Voice – Mix Granular, FM, Additive, and Subtractive synthesis. - FM Modes & Operator Stacking – Create rich, complex tones with 8 FM modes. - Real-Time Granulation – Process samples or live audio with up to 640 grains. - Deep Modulation & Envelope Control – Modulation matrix per layer, plus 2 EGs and filters per layer. - Advanced FX & Polyphony – 4 voices polyphony, arpeggiator, delay, and reverb. - High-Quality Sample Library & MPE Compatibility – Access FRMS’s expansive sound library and integrate with MIDI Polyphonic Expression and Ableton Link. Unlock endless sonic possibilities with FRMS, perfect for both beginners and advanced sound designers. "Imaginando super fan over here ..own everything they make. FRMS is no exception, as it’s incredibly powerful, versatile, and surprisingly intuitive. It’s a joy to work with, and the sound possibilities are endless." "I expected a lot from this app given the pedigree of the developer, but wow, this exceeded all my expectations. The depth of the granular synthesis engine combined with FM is truly amazing. A must-have for any sound designer." "This is a great app for anyone serious about granular synthesis. The interface is clean and easy to use, and the sound quality is top-notch. I find myself getting lost for hours exploring new sounds." "This synth is an interesting and great evolution in the world of granular. It pushes the boundaries of what you can do with layers and modulation. The presets are inspiring, but the real magic comes when you start creating your own." "FRMS has officially become my favorite synth app. The way it combines granular synthesis and FM is just genius. You can get subtle textures or full-blown sonic mayhem. Highly recommended!" "Every time I use FRMS, I feel like I’m discovering new dimensions of sound. The modulation options are vast, and the way you can shape tones makes it a designer’s dream. This app has changed my approach to sound design." "There’s something magical about the way FRMS handles sound. It’s intuitive yet deep, and I’ve created some of my best work using this app. Kudos to the developers for making such a high-quality product." "FRMS is absolutely brilliant. The interface is smooth, and the ability to layer sounds and modulate them takes granular synthesis to another level. I’ve been recommending it to everyone I know." "This app is an endless source of inspiration. Whether I’m working on cinematic soundscapes or glitchy textures, FRMS has everything I need. The layers and effects are phenomenal." "If you love creating ambient music, this app is for you. The ability to tweak and layer samples into lush textures is incredible. It’s become an essential part of my workflow." "The design of FRMS is superb. It’s both visually pleasing and incredibly functional. Every detail has been thought through, and the sound engine delivers in every way." "Hands down, the best granular synth I’ve used. The presets are great, but what sets it apart is how intuitive it is to create your own unique sounds."
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.