Answers for every screen.
Your personal media player & library.

4789 is a personal media player and library organizer for iPhone and television. It plays your videos with native hardware acceleration, opens your local files, connects your personal media storage and playback services, and organizes your entire watch history into a stunning poster-art library.

Here is what 4789 does for you:

Everything runs 100% locally on your device. Zero accounts, zero analytics, zero data logging. Your credentials, files, and watch history never leave your hardware.

No. 4789 does not supply, host, or sell video files. Like Infuse, VLC, or Kodi, it is an independent media player and library organizer.

You provide your media: open local video files from your device or USB drive, connect your personal cloud media storage and playback services, or attach public catalog lists. 4789 fetches artwork and metadata, organizes your watchlists, and plays your videos through an advanced hardware-accelerated engine.

4789 is built around an architectural invariant of exactly two top-level doors, keeping navigation instant and uncluttered:

Tapping any poster from either door opens the same unified Detail screen, where you can inspect cast, ratings, and reviews, then tap Play or choose from Sources.

No. 4789 has no user registration, no server login, and no centralized database. Everything—including your watch position, catalog connections, and settings—is stored locally in your iPhone Keychain and device storage.

When you connect optional third-party services (like Trakt for watchlist sync), the connection talks directly from your phone to that service API over HTTPS. 4789 servers never sit in the middle.

Because 4789 is distributed as an open-source unsigned IPA, you install it using personal sideloading tools. We recommend SideStore for computer-free refreshes, or AltStore and Sideloadly:

Apple requires Developer Mode to run sideloaded applications on iOS 16, 17, and 18. Here is the exact screen path:

Free Apple IDs sign applications with certificates valid for 7 days. If a certificate expires, the app will not launch until resigned.

With SideStore: Once installed, SideStore uses a local WireGuard VPN loopback to resign your apps directly on the iPhone over local Wi-Fi. You do not need to plug into a Mac or PC every week. Simply connect to Wi-Fi once every few days and SideStore refreshes 4789 in the background.

When updating, install the new IPA directly over the existing installation using the same Apple ID. iOS preserves the application container, including your watch progress, favorite lists, and stored preferences.

When you first open 4789, the app presents a clean onboarding flow:

You can also choose Skip for now to explore the interface before connecting playback services.

4789 supports the open manifest specification for catalogs and subtitle services. To add one:

You do not need a Letterboxd account or password. 4789 connects to any public Letterboxd profile:

Under Settings ➔ Metadata & AI, you can connect enrichment providers:

• MDBList: Enables source-labeled ratings (IMDb, Rotten Tomatoes, Metacritic, Trakt) and public list discovery. Get a free key at mdblist.com under Preferences ➔ API. Paste it and tap Test key.
• Trakt: Tap Connect Trakt to authorize two-way history sync. Titles you watch in 4789 mark as watched on Trakt, and your Trakt watchlist populates in Discover.

4789 makes it seamless to pull all your disparate film passions into one beautiful, unified cinema gallery:

You can add as many lists as you wish, creating a deeply personalized media organizer that reflects your exact taste.

4789 TV is a standalone companion receiver application for your television. It turns your TV into a first-party playback destination that your iPhone can discover and control over local Wi-Fi.

The fastest way to install on Android TV, Google TV, or Fire TV:

If Developer options is hidden on your Fire TV device:

Yes! 4789 has an ADB installer built into the iOS app:

4789 uses a peer-to-peer local network protocol. When you tap Play on TV, your iPhone discovers the 4789 TV receiver via local broadcast and communicates directly using HTTP RPC (port 8791) and WebSocket sync (port 9791).

Your iPhone can be locked, put in your pocket, or used for messaging while the film plays smoothly on the big screen.

The docked cast remote provides full interactive control over the television session:

• Precise scrubbing: Drag the playhead to any second with instant TV synchronization.
• Jump buttons: Quick 10-second skip forward or back.
• Track selection: Switch audio languages or change subtitle tracks without restarting the video.
• Episode picker: Jump to the next episode directly from the remote sheet.
• Switch sources: If a stream drops or buffers, open Sources from the remote and switch to a different file on the fly.
• Physical TV remote sync: If someone uses the TV remote to pause or scrub, the iPhone remote updates in real time.

Yes. Tap the phone icon or choose Play on this iPhone in the remote. The TV stops, and playback resumes immediately on your phone at the exact second, with your chosen audio and subtitle tracks preserved.

4789 supports multiple TV routes, but 4789 TV provides the cleanest experience:

• 4789 TV (Recommended): Direct MKV/HEVC container support, Dolby Vision tone mapping, multi-track audio bitstream passthrough, and bidirectional remote sync.
• AirPlay: Great for natively compatible MP4/H.264 files; complex MKV files or stylized subtitles fall back to Screen Mirroring.
• Chromecast: Supported via Google Cast SDK. Incompatible audio/video containers (like DTS or Dolby Vision) trigger an on-screen recommendation to use 4789 TV instead.
• Kodi: Supported via JSON-RPC. Compatible with existing Kodi home theater setups.

The iPhone player is powered by a high-performance native MPV/libmpv engine. It handles virtually any modern video file:

• Containers & Codecs: MKV, MP4, MOV, WebM, H.264, HEVC/H.265, AV1, and VP9.
• Color & Dynamic Range: Full HDR10, HLG, and Dolby Vision tone-mapping calibrated for OLED displays.
• Playback Speeds: 0.5x, 0.75x, 1.0x, 1.25x, 1.5x, and 2.0x with pitch-preserved audio.
• Background Play & PiP: Continue audio while navigating other apps or minimize into Picture-in-Picture.

While a video is playing, tap the speech-bubble subtitle icon in the player bar:

On 4789 TV, open player settings during playback and select Audio Profile:

• TV Speakers: High-quality stereo downmixing with dialog normalization.
• ARC / Optical: Encodes multi-channel audio to Dolby Digital (AC3) or DTS for soundbars connected via standard HDMI ARC or TOSLINK optical cables.
• eARC / AVR Passthrough: Bitstreams raw multi-channel audio (Dolby Atmos, TrueHD, DTS-HD Master Audio, and 7.1 LPCM) directly to an external A/V receiver for uncompressed sound.

Download movies or TV episodes to your iPhone to watch on flights or road trips with zero internet:

Yes. Go to Discover ➔ Local Files ➔ Import. Select any MKV, MP4, or MOV file from your iPhone storage, iCloud Drive, or a connected USB-C drive.

4789 matches filename metadata to fetch artwork and summary descriptions, and integrates the video directly into your library with resume tracking.

Use this concise script for YouTube Shorts, Instagram Reels, or TikTok videos:

Visual sequence to film: Show the dark Wall poster grid ➔ tap a poster ➔ tap Play on TV ➔ pan camera to television launching the video ➔ show the docked iPhone remote scrubbing the playhead.

These specific features showcase best on camera:

Content creators must avoid copyright strikes and accidental credential leaks on camera:

• Automatic Masked Keys: 4789 never reveals raw API keys or passwords on screen. Key fields remain masked with bullet characters during and after validation.
• Public Domain Test Titles: For copyright-safe video clips that will not trigger ContentID, use classic public domain films like Night of the Living Dead (1968) or open-source Blender foundation films like Big Buck Bunny (CC BY 3.0).
• Deterministic Demo Clips: Check out workflows.html to download approved 1080p video clips and poster frames for your B-roll.

Email [email protected] with your publication, YouTube channel, or social handle and mention the devices you are reviewing on (e.g. iPhone 15 Pro, Fire TV Stick 4K Max, Shield TV).

The developer provides test builds, verified release artifacts, high-resolution vector logos, and screenshot mockups without watermarks.

On iPhone, your service API keys and private URLs are encrypted in the system Apple Keychain. On Android TV, keys are encrypted using the Android Keystore hardware-backed security module.

These values are never stored on 4789 servers, analytics platforms, or iCloud backups unless you manually export them.

If the Sources list remains empty or Play does not start:

If your television does not appear in the destination list:

Common installation barriers on Android TV / Fire TV:

• OS Version Floor: Verify your TV runs Android 9 (API 28) or Fire OS 7 or later in Settings ➔ About. Older devices (Android 8 / Fire OS 6) cannot parse the APK.
• Signature Conflict: If you previously installed a debug test build, Android blocks installing official release builds over it due to mismatched signing keys. You must uninstall the previous test version first from Settings ➔ Apps.
• Insufficient Storage: Ensure your television box has at least 300MB of free internal storage to unpack and install the app.

Large 40GB+ 4K remuxes require high local bandwidth and decoder performance:

• Network Bandwidth: Connect your TV via wired Ethernet or 5GHz Wi-Fi. 2.4GHz Wi-Fi frequently drops packets on 4K bitrates exceeding 60 Mbps.
• Audio Decoder Overload: If your TV or soundbar does not support 7.1 TrueHD or DTS-HD, decoding complex audio in software can cause video stutter. In 4789 TV player settings, switch Audio Profile to Stereo PCM or ARC (AC3).
• Pick an Optimized Source: On iPhone, tap Sources on the movie page and select an optimized 1080p or 4K WEB-DL file instead of an uncompressed Blu-ray remux.

We actively triage bug reports. Here is the best way to report an issue: