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.
App Overview
HarkNote
HarkNote is a privacy-first audio recorder and transcriber that processes your recordings on your iPhone.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
N/A
No ratings yet
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.
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Build Kit
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A product spec, screen plans, and build steps for your coding agent.
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What's included15 files
A product spec, phased build plan, differentiation notes, and screen references.
- START_HERE
- AGENTS
- EVIDENCE
- SPEC
- BUILD_PLAN
- DIFFERENTIATION
- skills/
- screens/
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Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Screen plan
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.
Differentiate and validate
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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Free quick prompt For a smaller starting point
Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for HarkNote: map the core Productivity workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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Opportunities
AI-GENERATED OPPORTUNITY HYPOTHESES
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
Full offline with background sync
Assumption to check: No offline mode
Validate with people who use this workflow before building.
Hypothesis 2
Real-time sync with conflict resolution UI
Assumption to check: Sync issues
Validate with people who use this workflow before building.
Hypothesis 3
Minimal design, progressive feature disclosure
Assumption to check: Feature bloat
Validate with people who use this workflow before building.
App evidence
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
App Store description
HarkNote is a privacy-first audio recorder and transcriber that processes your recordings on your iPhone. Tap RECORD — that’s it. No account, no sign-in. Choose between Whisper and NVIDIA Parakeet v3; both transcribe entirely on your iPhone, with an optional live preview while recording. Your audio is not sent to us or to a cloud AI service. HarkNote downloads model assets only when needed or when you request them, and Settings lets you download, activate, switch, and remove models with live progress and a free-space check. WHAT YOU CAN DO • Record on demand from the app or, on supported devices, the Action Button, Control Center, or a Live Activity • Record standalone on Apple Watch with no iPhone nearby, then transfer the session to your iPhone for transcription when the devices reconnect • Import audio files from other apps through the iOS Share Sheet • Turn on a live transcript preview while you speak, then get a clean final transcript • Optionally link a recording to a calendar event using read-only calendar access • Optionally train a local Self voice profile so high-confidence speaker matches can be tagged as Self • Get an on-device summary and hold a conversation about the transcript using Apple’s on-device intelligence where available and a deterministic offline engine everywhere else • Keep audio local-only, or choose iCloud Drive storage for audio sync across your own devices PRIVACY BY DESIGN • No analytics, crash-reporting uploads, advertising SDKs, or tracking • Privacy nutrition label: Data Not Collected • Your audio, transcripts, notes, questions, summaries, calendar content, voice profiles, and speaker embeddings are not sent to us • Audio remains local by default; private iCloud storage is optional • You own and control your recordings WHAT TO KNOW HarkNote is a recording tool. A consent notice is shown during onboarding and must be accepted before use. A visible recording indicator and Live Activity show when recording is active. Recording laws vary; you are responsible for obtaining any consent required where you are. Microphone access is required. Calendar access is optional and read-only, and the app remains fully usable without it. On-device transcription is compute-intensive, so your device may warm during long sessions. You can disable live preview in Settings to reduce load. No subscription. No ads. No account. Just a recorder that respects you.
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Screenshots
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Build scope
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Define the first version
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Set boundaries
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Check the hard parts
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
SUGGESTED BUILD STACK
React Native
Supabase
Expo
RevenueCat
BUILD KIT DIFFICULTY
Advanced
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.
