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
PNG Tuber
PNG Tuber – VTuber on device
Free · In-app purchases
PRICE
Free
In-app purchases
BUSINESS MODEL
Freemium
No overall Grossing estimate available
RATING
★ 3.7
30 ratings · Top 50%
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 included16 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 PNG Tuber: map the core Photo & Video 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
Enhance the editing tools with more filters and adjustment options.
Assumption to check: Limited editing features compared to competitors
Validate with people who use this workflow before building.
Hypothesis 2
Simplify the subscription model and clarify what each tier offers.
Assumption to check: In-app purchases can be confusing
Validate with people who use this workflow before building.
Hypothesis 3
Optimize image handling for better performance.
Assumption to check: Performance issues with large PNGs
Validate with people who use this workflow before building.
Hypothesis 4
Incorporate onboarding tutorials and tips for using features effectively.
Assumption to check: Lack of tutorials for new users
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
PNG Tuber – VTuber on device Take your VTuber avatar straight from your photo library and bring it to life in real‑time! PNG Tuber lets you use your VTuber avatar to create your content on-device, no other tools needed. * Tap‑to‑Load Avatar - Pick any avatar image you already own from your gallery and load it instantly. * Microphone Trigger Control - Set the mic volume threshold so your avatar reacts precisely when you speak. * Picture‑in‑Picture (PiP) - Keep your avatar floating over other apps or on your home screen while you multitask. * Fully Offline - All image rendering and audio processing happens locally; your files stay private. How It Works: * Open PNG Tuber. * Choose your 4 avatar images from your library - eyes open/mouth closed, eyes closed/mouth closed, eyes open/mouth open and eyes closed/mouth open * Adjust the mic‑trigger level to your preference. * Start audio monitoring and turn on picture-in-picture * Start streaming, recording, or simply enjoy the avatar in PiP mode. Download PNG Tuber today and let your chosen avatar shine across all your apps! A subscription via in-app purchase is required to use PNG Tuber without any watermarks on the avatar. The service is provided according to the standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy policy: https://www.ganglionsoftware.com/privacy.html
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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.
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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.
