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.
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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.
A product spec, screen plans, and build steps for your coding agent.
First kit free with a verified email
Combine features and design from your favorite apps.
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Generating… usually about a minute.
What should your app do differently? Your note travels with the kit so your coding agent builds around your idea.
A product spec, phased build plan, differentiation notes, and screen references.
Illustrative example: an invoice app for independent contractors. Your kit is tailored to the app you choose; this is not its generated content.
Goal: Send a clear invoice after finishing a job.
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.
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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Good fit for mobile-first iOS and Android prototypes with managed app scaffolding.
Rork plan preview for Dee Jellie: Jellyfin Media: map the core Music workflow, choose the smallest differentiated feature set, define the data and monetization boundaries, then prototype the riskiest user journey first.
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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
Assumption to check: Limited music library access compared to larger platforms
Validate with people who use this workflow before building.
Hypothesis 2
Assumption to check: Potential for slow loading times with large libraries
Validate with people who use this workflow before building.
Hypothesis 3
Assumption to check: Lack of social sharing features
Validate with people who use this workflow before building.
Hypothesis 4
Assumption to check: Difficulty in discovering new music
Validate with people who use this workflow before building.
Original App Store material. Ratings and screenshots describe the existing app, not proof of demand for your version.
Learn more: deejellie.com. Want a test run? Honu’in (radio) and GilloCast (podcasts) are free to download. --- Access to a Jellyfin Media Server and account is required to use this app. No media or hosting service is included. --- All core functionality is available upon purchase. An optional Supporter subscription adds power-user extras: custom EQ and Smart Mix rules, Party Mode hosting, Apple Watch direct playback and downloads, and more. Lifetime Supporters unlock exclusive gold icons and colors. --- Dee Jellie is a native Jellyfin player for the music and video library you already own. Stream your self-hosted Jellyfin music, movies, and TV on iPhone, iPad, Mac, Apple Watch, Apple TV, and CarPlay. Browse albums, artists, playlists, shows, podcasts, audiobooks, and live radio in one app. JELLYFIN MEDIA PLAYER Connect your Jellyfin server and play the music and video you host yourself. Browse your full library, artwork and all, nothing to migrate. DISCOVER Dee Jellie's Picks, trending albums, new releases from artists you own, and movies and shows chosen from what you watched, all built on device from what you play. Request albums, movies, and shows you find through Seerr. Ask the built-in AI assistant for something to play, in your library or beyond. Requires Apple Intelligence. CINEMA MODE Watch your Jellyfin movies and TV in 4K HDR, with subtitles and Live TV. Pick up where you left off, AirPlay to the big screen, or play on Apple TV. MULTI-SERVER SUPPORT Jellyfin is built in. Unlock OpenSubsonic and Echolair (IAPs; OpenSubsonic is music-only) to add any number of servers and mix them in one queue. Quick Connect signs in new devices fast. PLAYBACK Lossless FLAC, gapless playback, Quick Play, Instant Mix, Shuffle, 0.5x-3x speed, crossfade, volume normalization, sleep timer, Infinity playback, surround sound, and object-based spatial audio. LYRICS Synced lyrics stay in step as you scrub or jump through songs. Tap any line to seek. EQ & VISUALIZER A 16-band equalizer with profiles tuned per genre, plus a real-time visualizer. Supporters: create custom profiles. OFFLINE DOWNLOADS Download albums, artists, songs, or episodes with one tap. Pick original or a bitrate cap, then go offline automatically. NETWORK-AWARE STREAMING Per-network rules: direct play, quality caps, transcoding, and data limits, with smart defaults you can change. APPLE WATCH A remote for the player on your iPhone. Supporters: a full player on the watch, with downloads and direct streaming, no iPhone needed. CARPLAY Full CarPlay support to browse and play your library safely from your car display. APPLE TV Browse from the couch. Supporters host Party Mode; anyone nearby with the app can shape the shared queue. PODCASTS Subscribe to public podcasts and stream new episodes as they drop. Supporters: download episodes for offline. AUDIOBOOKS Full chapter support, cross-device resume, and timestamped bookmarks. RADIO Tune into 55,000+ community live radio stations worldwide. Browse by genre and country, and save favorites locally or, where supported, on your servers. SOUNDSCAPES Soundscapes to focus, relax, or sleep: rain, thunder, campfire, wind, white noise, and more. Generated live on device, endlessly ever-changing. Layer up to three. SIRI, SPOTLIGHT & WIDGETS Play with Siri, search in Spotlight, and put Now Playing and tap-to-play shortcuts on Home and Lock Screen. SMART MIX Generate playlists from your library. Supporters: save rulesets by decade, genre, favorites, and more. SCROBBLING Send what you watch to Trakt, automatically and off until you sign in. STATS & ACHIEVEMENTS Unlock 500+ achievements and listening insights. PRIVACY-FIRST DEFAULTS No tracking, no analytics, no in-app ads. Your library comes from your signed-in servers; preferences and sync use iCloud or optional account services. --- Need support? Report any issues via Email: [email protected] Terms of Use (EULA): https://www.deejellie.com/eula
Written user reviews are not shown here. Check current App Store reviews >
Plan a focused first version with your coding agent. These are planning assumptions, not a delivery guarantee.
Choose one audience and one core workflow. Use the kit to agree on its screens, data, and acceptance criteria before building.
Decide which secondary features, integrations, and platform support can wait. Your version does not need to reproduce everything in the original.
Validate external services, specialist technology, data access, and ongoing costs for your chosen scope.
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.