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.
Instantly create unlimited, copyright-free guitar riffs
$2.99 · 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 Riffler: 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 offline capabilities for music playback.
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Difficulty in discovering new music.
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: In-app purchase process can be confusing.
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.
Instantly create unlimited, copyright-free guitar riffs. Just tap "Create" and listen to your new riff. PRESETS The easiest way to get started is to select from the huge list of preset musical styles, tap "Create", and a unique guitar riff will be made. The created riff is displayed as guitar tablature which you can listen to and save. CUSTOMIZATION For advanced users wanting to harness the full power of Riffler, there is a huge range of customizable settings allowing you to fine tune and personalize your own unique sound. WHO WOULD USE RIFFLER? • Guitarists looking to improve their playing, with endless new riffs to practice. • Composers needing an additional creative spark of inspiration to complement their music. • Musicians looking for a virtual guitarist for unlimited jam sessions. • Producers wanting to stand out from the crowd by creating a library of unique guitar riffs instead of using the same samples and loops as everybody else. • Most of all Riffler is fun! It's great for anybody looking to experiment and create their own music! EXPORT MIDI AND AUDIO The created riff can be exported as MIDI or audio file. AUv3 Riffler is a standalone app and also an AUv3 plugin that can be loaded into a host music app. The Riffler AUv3 plugin can be synced inside a host app and can send audio and MIDI to other effects, synths, samplers and virtual instruments. All hosts are compatible with Riffler's audio and certain hosts enable Riffler to send MIDI data. MIDI compatible hosts include AUM, Loopy Pro, Cubasis 3, Beatmaker 3, apeMatrix and Audiobus 3. REALISTIC TONES Riffler's audio engine creates stunningly realistic guitar tones. Riffler is the playground for anyone curious about music creation! Experiment with various tempos, scales, tunings, and time signatures, and harness the power of Riffler's cutting edge artificial intelligence (AI). SPECS: Tempo: 40 - 240bpm. Sample rates: 44.1kHz, 48kHz Key: All 12 keys. Scales: Pentatonic, blues scale, extended blues, chromatic, major (ionian), dorian, phrygian, lydian, mixolydian, natural minor (aeolian), locrian, harmonic minor, phrygian dominant. Tunings: Standard, drop D, Eb, C#, C, 7 string, 7 string drop A, 8 string. Time signatures: 4/4, 3/4, 2/4, 1/4, 12/8, 6/8, 7/8, 5/8, 3/8, 1/8 Export: .wav, .mid, .riffle Tones: 40 different guitar tones, 10 different synth tones CONTROLS: Tempo, length, time signature, feel, key, tuning, progression, scale, tone, double tracking, delay, humanise, sustain, bend, powerchords, palm muting, vibrato, arpeggiate, range, melody, rhythm, gaps, motif, runs, run range, ending length, remove duplicate notes, lock to single octave, tremolo picking.
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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.