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
nPlayer
** nPlayer officially supports DTS (DTS HD ), DTS Headphone:X.
$4.99 · In-app purchases
PRICE
$4.99
In-app purchases
BUSINESS MODEL
Paid
No overall Grossing estimate available
RATING
★ 4.7
1,906 ratings · Top 15%
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 included19 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 nPlayer: 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
Ensure support for a wider range of video formats and codecs.
Assumption to check: Limited format support for videos
Validate with people who use this workflow before building.
Hypothesis 2
Optimize video streaming and loading times.
Assumption to check: Inconsistent playback performance
Validate with people who use this workflow before building.
Hypothesis 3
Implement features like picture-in-picture, speed control, and bookmarks.
Assumption to check: Lack of advanced playback features
Validate with people who use this workflow before building.
Hypothesis 4
Simplify navigation and enhance user onboarding process.
Assumption to check: Complex user interface 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
** nPlayer officially supports DTS (DTS HD ), DTS Headphone:X. ** nPlayer supports Dolby (AC3, E-AC3). ** nPlayer is the universal app. You can install it in any other iOS device without additional purchase. - You don't need to convert video files to MP4 to play them in your mobile device. nPlayer enable you to play all kinds of video formats and codecs without file converting efforts. - You don't need to store video files in your device with limited storage space. nPlayer's powerful and various network technologies will help you to stream them from remote devices. - With your finger tip, you can adjust playback position, move to previous and next subtitle position, adjust location and font size of subtitles, control volume and brightness. - Experience nPlayer, thousands of users recommendations. * Features - Supports officially DTS audio codec (DTS HD) - Supports Dolby audio codec (AC3, E-AC3) - Supports iXpand Drive - Supports Chromecast - Supports video cast for Smart TV - Supports HDMI output - Supports video files : MP4, MOV, MKV, AVI, WMV, ASF, FLV, OGV, RMVB, TP etc. - Supports audio files : MP3, WAV, WMA, FLAC, APE etc. - Supports subtitle files : SMI, SRT, SSA, IDX, SUB, LRC, SUP, MLP2 etc. - Supports image files : JPG, PNG, BMP, GIF, TIFF etc. - Supports playlist files : CUE, M3U, PLS - Supports WebDAV, FTP, SFTP, HTTP, SMB/CIFS, NFS - Supports UPnP/DLNA (supports subtitles if DLNA server provides subtitles information.) - Supports cloud service (Box, Dropbox, OneDrive, Yandex.Disk) - Supports in-app web browser - Supports iTunes video/audio play (except for DRM contents) - Supports videos and pictures in Album - Playback speed control : 0.5x ~ 4.0x - Resume playback - AB repeat(specific section repetition) - Screen lock - Supports AV1/HEVC/H.264/MPEG4 Hardware acceleration - Supports 3D video mode - Screen flip horizontally, vertically. brightness and saturation control - Aspect ratio : Default, 1:1, 3:2, 4:3, 5:3, 16:9, 1.85:1 etc - Supports multi-track audio - Supports audio boost - Supports audio sync - Supports lyrics display - Supports Dolby, DTS HDMI Bitstream (Passthru) - Supports embedded subtitles - Supports multi-track subtitles - Supports user’s selection of subtitle files - Supports addition of optional subtitle files while playback - Supports subtitles font, color, shadow, outline customization - Supports subtitles sync - Supports external subtitle fonts - Supports SAMI(SMI) tag - Supports SSA/ASS with full styling, embedded subtitles - File management : Delete, Move, Rename, Create a folder - Playlist management : Add, Delete, Modify - Supports recently played list - Folder lock - Supports Open-in - Supports UI theme * Gesture Features - Tap : Menu - Double tap : Pop-up play - Drag horizontally : Playback position adjustment - Drag vertically on right half of the screen : Volume control - Drag vertically on left half of the screen : Brightness control - Pinch on the screen : Screen size adjustment - Drag horizontally on subtitle text : Move to previous/next subtitle text - Drag vertically on subtitle text : Subtitle position adjustment - Pinch on subtitle text : Subtitle font size adjustment - Supports finger gesture customization
Written user reviews are not shown here. Check current App Store reviews >
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.
