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
Panther : Private Life OS
Panther is a calm, private, all-in-one assistant that lives entirely on your device.
$1.99 · In-app purchases
PRICE
$1.99
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 Panther : Private Life OS: 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
Focus on a minimalist design with clear navigation.
Assumption to check: Users often find productivity apps cluttered and overwhelming.
Validate with people who use this workflow before building.
Hypothesis 2
Implement a color-coding system for task priorities.
Assumption to check: Tasks can be hard to prioritize without a visual system.
Validate with people who use this workflow before building.
Hypothesis 3
Offer calendar syncing options for better task management.
Assumption to check: Lack of integration with calendars.
Validate with people who use this workflow before building.
Hypothesis 4
Provide clear explanations of premium features and trial options.
Assumption to check: In-app purchases can be confusing.
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
Panther is a calm, private, all-in-one assistant that lives entirely on your device. No cloud. No accounts. No tracking. Your notes, tasks, calendar, expenses, and travel plans stay on your iPhone — and so does the AI that understands them. WHAT'S INSIDE • Notes — Capture thoughts, photos, and voice memos. Panther can summarize, suggest titles, extract action items, and polish your writing on-device. • Tasks — A focused checklist with priorities, due dates, and gentle local reminders. • Calendar — Smart compose lets you type "lunch with Sarah Friday 1pm at Chipotle" and Panther parses the date, time, place, and category for you. • Expenses — Track spending across multiple wallets and currencies. Get budget summaries, category insights, and savings goals. • Travel — Plan trips with bookings, places to visit, packing lists, photos, and AI-generated itineraries tailored to your destination. ON-DEVICE INTELLIGENCE Panther runs a small language model directly on your iPhone using Apple Silicon. Summarization, parsing, and writing assistance happen locally — your data never leaves your device. Apple Vision powers fast on-device OCR for receipts and notes. Speech recognition is on-device too. WHY ON-DEVICE • Privacy by default — there is no server to leak from. • Works offline on a plane, in the subway, anywhere. • No subscription. No ads. No data harvesting. DESIGNED FOR FOCUS A dark, restrained interface with a tiny mascot. No notifications spam, no engagement loops. Just the tools you reach for, organized. PERMISSIONS • Camera & Photos — only when you choose to attach an image. • Microphone & Speech Recognition — only when you press the voice button. • Notifications — only for the local reminders you create. Panther is a quiet companion for the people who'd rather think than scroll.
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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
Expo
React Navigation
React Native Async Storage
Supabase
Zustand
BUILD KIT DIFFICULTY
Intermediate
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.
