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.
KING OF VHS: VCR SYNTH captures the sound of vintage synthesizers recorded through a VCR, then carefully resampled for that unmistakable lo-fi character.
$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.
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 King of VHS: VCR Synth: 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 options compared to desktop synthesizers
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Lack of advanced editing features
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: High learning curve for new users
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Occasional performance issues on older 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.
KING OF VHS: VCR SYNTH captures the sound of vintage synthesizers recorded through a VCR, then carefully resampled for that unmistakable lo-fi character. “KING OF VHS has got to be the best iPhone/iPad synth, 2025!” – 12x Platinum Producer, Bolo Da Producer, "THIS IS APP IS A GAME CHANGER" Warm, retro-inspired feel. Enjoy the vibe of dusty tapes, 80s synths, and analog charm KING OF VHS: VCR SYNTH has been completely rebuilt from the ground up — FEATURES all NEW CODE, PRO FEATURES, Plus some Brand New Bonus Sounds. And YES, your favorite classic samples are still here. No in-app purchases. No subscriptions. No data tracking. "King of VHS is the NEW STANDARD for LO-FI Synths" – Ikkai Blog, 2025 "Possibly the BEST SOUNDING app I've made." – AnalogMatthew FEATURES: ∙ Over 160+ Multi-Sampled PCM Instruments Total – 2,500+ high-quality VCR/VHS recorded samples ∙ Over 400 brand new samples (into 40 multi-sampled PCMs, with 300+ New Presets!) ∙ 3 LFOs with deep modulation options (no LFOs in the original) ∙ Built-In Synth Engine – Making VCR Synth a true VA synth, not just a sample player. ∙ Step Sequencer – With adjustable rate, gate, and destination routing ∙ Re-Engineered UI & VCR FX – Customize tone and texture ∙ Rewritten from scratch: Stable, and built to last BONUS FEATURES: ∙ Classic VCR sound effects — buttons, tape hiss, and more ∙ Free expansion pack: OP-1 recorded straight to VHS ∙ Universal app — iPhone and iPad versions included ∙ Works with MIDI keyboards, iOS MIDI hosts ∙ Robust MIDI Learn and Mapping options ∙ Entire app is 200 MB Download! WOW! KING OF VHS is your new secret weapon for lo-fi and retro-inspired production. One-time price. No upsells. Just pure vintage flavor. "I picked up King of VHS and this is not an exaggeration: I’m halfway thru auditioning all the presets and there are so so many great sounds my favorites folder is overflowing with stuff" – Loopy Pro Forum WHAT'S NEW: ∙ 40 NEW multi-sampled Instruments (400+ Brand New Samples for this App) ∙ 300+ Completely New Presets, Taking advantage of New features and PCMs ∙ 3 Powerful LFOs – Tons of modulation destinations (the original had zero) ∙ Step Sequencer – With adjustable rate, gate, and destination routing ∙ Full Synth Engine – VCR Synth is now a real synth, not just a sample player. Includes engine from King of Digital ∙ Completely Rebuilt Codebase – Faster, more responsive, and more powerful ∙ Tempo Sync Support – Finally, everything locks to your BPM ∙ Re-Engineered FX – Tuned for the sweet spot in every mix ∙ Keyboard Splits – Assign layers across different keyboard zones ∙ Dual Panel UI – Optimized layout for iPad: stacked panels for better workflow ∙ Upgraded Filters – Including lush Moog-style low-pass filters ∙ New Filter Types – Band-pass and high-pass now included ∙ Alternate Tunings – Support for 432 Hz and other A tunings ∙ Added Chorus Effect – For richer, wider sounds ∙ Global & Layer Bend Controls – Perfect for risers, drops, and FX shaping ∙ Robust MIDI Learn System – Save/load mappings, plus pre-mapped templates ∙ PCM Previewing – Audition samples directly from the selection panel ∙ Improved PCM Navigation – Left/right buttons for faster browsing ∙ Overall Sound Quality Improved PLUS, TOO MUCH MORE TO LIST… TELL ME MORE ABOUT THE SOUNDS! WHAT'S INCLUDED? ∙ Includes samples from Brian Funk’s iconic 80s VHS sample pack (a $15 value) ∙ Includes samples from VCR Wave OP-1 desktop pack (another $15 value) ∙ Expressive New Sounds – NEW Bank of 100 Presets by DMT Cymatics ∙ EVERYTHING INCLUDED, FREE! Create instant nostalgia with your audience... Lo-Fi vibe, VHS warble, this might be your new favorite app! POSSIBLY THE BEST VALUE IN MOBILE MUSIC? Yes, Buy Now! "There’s something about these older recordings that just takes you back in time." – Brian Funk, Ableton Certified Trainer We could keep going, but here’s the most important thing: It sounds incredible. No fluff, no filler.. just pure retro synth magic.
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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.