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
zFuse - Video Player
- zFuse can play all video formats and encodings, allowing you to play video files on your mobile device without the need to convert to MP4.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.4
222 ratings · Top 30%
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 included18 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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Quick prompt
Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
// RORK SYSTEM PROMPT
Rork plan preview for zFuse - Video Player: map the core Entertainment 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
Implement more flexible download settings and storage management.
Assumption to check: Limited offline playback options for downloaded content
Validate with people who use this workflow before building.
Hypothesis 2
Add robust parental controls and content filtering.
Assumption to check: Lack of parental controls
Validate with people who use this workflow before building.
Hypothesis 3
Implement adaptive streaming for better quality management.
Assumption to check: Inconsistent video quality across different connections
Validate with people who use this workflow before building.
Hypothesis 4
Integrate playlist functionality and watch later options.
Assumption to check: No support for playlists or watch later features
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
- zFuse can play all video formats and encodings, allowing you to play video files on your mobile device without the need to convert to MP4. - zFuse supports ASS/SSA/SUP effect subtitles, enabling you to experience full subtitle effects just like on your PC/Mac. - zFuse features powerful networking technologies that allow you to play media from your PC or NAS directly, without occupying any space on your limited device storage and without needing to download anything. - zFuse also allows you to easily download files or directories directly from your PC or NAS, making it the perfect companion for your trips. - zFuse supports a variety of gestures - simply move your fingers to adjust playback position, font size, volume, and brightness. - zFuse carefully protects your privacy with folder encryption, so you no longer need to worry about privacy issues. - zFuse's detailed features include: * SMB/CIFS playback and discovery (easily play media files from your PC). * Download media files or directories from SAMBA/DLNA/WebDAV/FTP directly. * UPnP/DLNA playback and discovery. * Emby and Jellyfin media server support. * AirPlay playback. * Picture-in-Picture mode support. * iPad split-screen multitasking support. * Hardware acceleration. * HDR Tone Mapping support on non-HDR displays. * Subtitle effects support. * 0.5x-3.0x playback speed control. * 0.5x-5.0x screen zoom. * Media preview while seeking. * Built-in audio enhancement. * Multi-soundtrack selection. * Embedded/external subtitle track selection. * Subtitle synchronization. * Audio synchronization. * External subtitle font selection support. * Playlist file preview before playback. * Blu-ray directory playback. * Real-time playlist management and editing. * Screen mirroring. * File Management: - Delete, move, rename, create folders. - Wi-Fi file transfer support without USB cable connection. - Streaming media playlist creation support. - File decompression support: 7z, zip, rar, tar, bz, bz2, etc. * Gesture Controls: - Horizontal drag: adjust playback position. - Vertical drag on left side: adjust volume. - Vertical drag on right side: adjust brightness. - Pinch to zoom: adjust screen size. - Double-tap: play/pause. - Two-finger double-tap: change video aspect ratio. * External Keyboard Support: - Space: pause/play. - Left Arrow: backward seek. - Right Arrow: forward seek. - Esc: exit playback. - S: change playback speed. - B: play previous. - N: play next. - Z: change screen scale. * Supported Video Formats: MP4, MOV, MKV, AVI, WMV, FLV, RMVB, ASF, OGV, Blu-ray ISO and more. * Supported Audio Formats: MP3, WAV, WMA, FLAC, APE and more. * Supported Subtitle Formats: SRT, SSA, ASS, SUP, VTT. * Supported Image Formats: JPG, PNG, BMP, TIFF, GIF, HEIC and more. * Supported eBook Formats: EPUB, TXT, PDF. * Code Editor Supported Languages: JSON, HTML, XML, C/C++, Lua, Java, Objective-C, Swift, Python, JavaScript. * Supported Document Formats: Word, Excel, PowerPoint, Numbers, Keynote, Pages, RTF, CSV.
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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.
