Nightingale
Turn your local music library into karaoke with ML vocal splitting, word-aligned lyrics, and real-time pitch scoring.
If you own a music library and want real karaoke without a subscription, this is the best free option we've seen. The CJK character-level alignment is genuinely unique, and v1.1's leaderboards and Docker images add real polish. The catch: you must supply your own audio and accept a DIY edge — no built-in catalog and no customer support.
Verified 4d ago · liveness 75/100 · cite: rightaichoice.com/tools/nightingale
- Karaoke enthusiasts with large local music libraries
- Party hosts wanting a private, offline setup
- Polyglot singers needing CJK support with romanized readings
- Self-hosters who prefer no cloud dependency
- Users without their own music files or media server
- Those needing a built-in song catalog or store
- Non-technical users who want plug-and-play online service
We scan live Reddit threads, YouTube comments, X posts, G2 reviews and other communities — and hand you an honest verdict in under a minute.
- Honest verdict, not marketing
- Real pros & cons from real users
- Attributed quotes with receipts
3 free scans · no card needed
Skip Nightingale if you don't have your own music library or media server, expect a built-in song catalog, or want a plug-and-play online service with customer support — this is a self-hosted, DIY tool that requires technical comfort and local files.
There are no paid tiers, but you'll need a GPU for faster stem separation and transcription — CPU-only setups will see slower analysis times.
Nightingale is completely free and open source under GPL-3.0, donation-supported via Patreon or Ko-fi — no paid tiers. Unlike subscription services like Smule or Karafun, it costs nothing, but you trade a built-in catalog and customer support for DIY setup. It suits privacy-conscious users with local libraries.
In short
Nightingale — Turn your local music library into karaoke with ML vocal splitting, word-aligned lyrics, and real-time pitch scoring. Best for Karaoke enthusiasts with large local music libraries, Party hosts wanting a private, offline setup, Polyglot singers needing CJK support with romanized readings. Free to use.
What's new in Nightingale
Checked 2 days agoAcross the latest 1 update: 1 feature update.
What people actually say about Nightingale — is it worth it?
We ran a structured research pass across product reviews, community discussions, and post-purchase forum threads to surface the patterns vendors won't publish themselves. Below: the recurring strengths, the hidden costs people mention most, and the cohort that consistently regrets adopting this tool.
76 mentions across 6 sources (Hacker News, YouTube, Product Hunt, App Store, GitHub, Lemmy) · researched Aug 29, 2026.
- +Fully open-source and free, no subscription or cloud lock-in.
- +Supports multiple library sources: local folder, Plex, Jellyfin, Navidrome.
- +Word-level lyrics alignment with WhisperX and CJK character alignment.
- +Real-time pitch scoring with star ratings adds gamification.
- +Key and tempo adjustments with instant on-play audio prep.
- −ML processing demands significant CPU/GPU resources, may struggle on low-end hardware.
- −Setup complexity is high; not for non-technical users seeking plug-and-play.
- −Limited community and documentation due to niche audience.
- −Name collision with other products causes confusion and diluted feedback.
- −No official mobile app; only desktop and web modes.
- • Requires you to supply your own song library
- • May need to purchase additional hardware (GPU) for smooth performance
Viability Score
How well maintained and how widely used is Nightingale? Built from what the vendor actually publishes (docs, changelog, tutorials, integrations, pricing), whether the site is live, and how much real users discuss it. How we calculate this
Last calculated: August 2026
How we score →Key Features
- Vocal isolation via UVR Karaoke or Demucs
- Word-level lyric transcription with WhisperX
- Per-character CJK forced alignment with romanized readings
- Pluggable ASR: Whisper or Parakeet v3 (experimental)
- Real-time pitch scoring with star ratings
- Key and tempo adjustments
- Audio-reactive GPU shader backgrounds (10 shaders, 5 video flavors)
- Video file support (.mp4/.mkv) with background playback
- Mic monitoring with adjustable gain (0–200%) and latency test
- Player profiles with separate score histories
- Lyrics editor with LRCLIB carousel and paste-your-own-LRC
- Library sources: folder, Plex, Jellyfin, Navidrome
- Self-hosted web mode
- Gamepad and touch navigation
- In-app updates on macOS and Windows
About Nightingale
Nightingale turns your own music collection into a karaoke system, no cloud or subscription required. It runs as a free, open-source desktop app for Linux, macOS, and Windows, or as a self-hosted web build you can open from any browser on your home network. Point it at a folder, Plex, Jellyfin, or Navidrome, and the app handles the rest: separating vocals, aligning lyrics word-by-word, and scoring your pitch in real time. Under the hood, Nightingale uses UVR Karaoke or Demucs for stem separation, WhisperX for word-level transcription, and offers a pluggable ASR option with Parakeet v3 for ~25 European languages. CJK songs get per-character forced alignment with romanized readings in Hepburn, pinyin, Jyutping, and Revised Romanization. The newest v1.1 release brings global and per-song leaderboards, personal-best five-star ratings, prebuilt Docker images for CPU or CUDA, and instant key/tempo controls that prepare audio on play. Playback extras include 10 audio-reactive GPU shader backgrounds plus 5 Pixabay video flavors, video file support for .mp4 and .mkv, mic monitoring with adjustable gain (0–200%) and beep-based latency calibration, per-player profiles with separate score histories, and gamepad or touch navigation. Everything is packed into a single binary — ffmpeg, Python, PyTorch, and model files are bootstrapped on first launch. You can also paste your own LRC lyrics, edit them in-app, or drop UltraStar song folders. Nightingale is donation-supported (Patreon or Ko-fi) with no paid tiers, built by one developer under GPL-3.0. Unlike online services like Smule or Karafun, Nightingale keeps your audio local and demands no recurring fee — but you need to supply your own song library and be comfortable with a self-hosted setup if you want whole-house access.
Behind the Verdict
When you have a decent music library already, Nightingale is the rare tool that turns it into a fully-featured karaoke system without costing a cent or sending your files to a cloud. The pipeline is genuinely smart: UVR Karaoke or Demucs for stems, WhisperX for word-level alignment, and a pluggable ASR that lets you switch to Parakeet v3 for European languages. CJK support with per-character alignment and romanized readings is something I haven't seen anywhere else, even in paid apps. Where it falls short is the onboarding. It's a single binary, but it still expects you to bring your own audio, figure out model downloads on first launch, and accept that the web mode requires a Linux box and some networking knowledge. If you're not comfortable with self-hosting or pointing at media servers, you'll hit friction. There's no built-in catalog, no store, and no customer support beyond a Discord and GitHub issues. Compared to online services like Smule or Karafun, Nightingale trades their convenience and song libraries for total privacy and zero recurring fees. If you're the kind of person who already runs a Plex or Jellyfin server, the integration is seamless — you point it at the library and go. If you're a casual singer who just wants to pick from a catalog, it's not the right fit. v1.1's leaderboards are a nice touch for parties, and the Docker images make self-hosting a lot easier than before. But the core experience still demands patience: stem separation takes time, and automatic lyric transcription isn't perfect — that's why the editor exists. In practice, you'll spend more time prepping songs than singing on day one, but the payoff is a private karaoke setup that costs nothing to run. We'd reach for Nightingale when we own the music, value privacy, and don't mind
Researching Nightingale? Get your full AI stack in 60 seconds.
Free, no signup — tell us your goal and get tools matched to your budget & existing stack.
Real-world workflow fit
Concrete scenarios for the personas Nightingale actually fits — and what changes day-one when you adopt it.
You want to set up karaoke for a gathering without relying on a streaming service or paying for a catalog.
Outcome: Install Nightingale on your laptop, point it at your music folder, and within minutes you have a karaoke app with vocal separation, word-level lyrics, and pitch scoring. Guests can join via the self-hosted web build and queue songs from their phones.
You want to practice Japanese pop songs with accurate romanized lyrics to improve pronunciation.
Outcome: Drop your MP3s into Nightingale's library. The app transcribes and aligns lyrics with per-character romanized readings in Hepburn, so you can follow along and get real-time pitch feedback.
You already run a media server at home and want to add karaoke without cloud dependencies.
Outcome: Connect Nightingale to your Plex or Jellyfin library. Songs cache locally on first play, and you can run the desktop app or self-host the web build for whole-house access from any browser.
Use Cases
- Analyze your MP3 collection and sing along with scored feedback.
- Host a karaoke party using your home media server without streaming.
- Practice Japanese or Chinese songs with per-character romanized lyrics.
- Edit misaligned lyrics via the in-app editor for perfect synchronization.
- Set up a self-hosted web instance for guests to queue songs from their phones.
Models Under the Hood
as of 2026-08-30
Limitations
- Nightingale processes music locally, so performance depends on your hardware, and a GPU is recommended for faster analysis.
- You must supply your own music files from local folders, Plex, Jellyfin, or Navidrome.
- Self-hosted web mode requires a Linux box on your home network.
- Some features like UltraStar support may be experimental.
as of 2026-08-23
Verification history
We have re-verified Nightingale 5 times since . Each pass re-reads the vendor's own pages and re-checks every listed field against that evidence; passes where nothing had changed are marked as such.
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
- — re-verified summary, description, our verdict, our analysis, pricing model, pricing tiers, features, integrations, who it suits, who should skip it
Free to cite with attribution — this page re-verifies continuously.
12-month cost
Project the real annual outlay, including the implied monthly cost when only an annual tier is published.
Vendor list price only. Add-on usage, seat overages, and contract minimums are surfaced under Hidden costs & gotchas.
Plans compared
For each published Nightingale tier: who it actually fits, and what it adds vs. the previous tier. Cross-reference the cost calculator above for projected annual outlay.
Free & Open Source
$0/mo
Ideal for
Anyone with a local music library who wants free, offline karaoke without a subscription — especially privacy-conscious users and self-hosters.
What this tier adds
The only tier — $0 forever, with all features included: stem separation, word-level lyrics, CJK support, pitch scoring, and self-hosted web mode.
Where the pricing makes sense
The company stage and team size where Nightingale's pricing actually pencils out — and where peers do it cheaper.
Nightingale is completely free and open source under GPL-3.0, donation-supported via Patreon or Ko-fi — no paid tiers. Unlike subscription services like Smule or Karafun, it costs nothing, but you trade a built-in catalog and customer support for DIY setup. It suits privacy-conscious users with local libraries.
Setup time & first value
How long it actually takes to get something useful out of Nightingale — broken out by persona, not the marketing-page minute.
For a local folder library: install the desktop app, point it at your music, and within 10–20 minutes you'll have your first analyzed song ready to sing. For Plex/Jellyfin/Navidrome connections, add 5–10 minutes for authentication. Self-hosted web mode on Linux takes about 15–30 minutes using the one-install script.
Switching to or from Nightingale
How to bring data in from common predecessors and how to get it back out — written for the switcher, not the buyer.
- →From Smule or Karafun: Export your song library locally and point Nightingale at the folder — you'll lose the cloud catalog but keep your audio and gain offline scoring.
- →From UltraStar Deluxe: Drop USDX song folders into Nightingale's library — pitch and lyrics come straight from the file, no re-analysis needed.
- ↗To any other karaoke app: Your music files are untouched locally, and Nightingale exports nothing — you simply point the new app at your existing folder or media server.
Integrations
Resources & Guides
Tutorials & Learning
Official links
Tools that pair well with Nightingale
Common stack mates teams adopt alongside Nightingale, with the specific reason each pairing earns its keep.
Mureka
AI music generator that turns text prompts into royalty-free songs, full vocals, and stems you can mix in your DAW.
Synthesizer V
AI vocal synthesizer that turns lyrics and melody into lifelike singing, with a free tier and advanced Pro editing.
Seed Music
AI music studio that turns prompts, lyrics, and references into structured, track-ready briefs.
Featured Head-to-Head Comparisons
Nightingale vs Landr Mastering
Choose LANDR Mastering if you need AI-powered, professional-grade mastering with reference matching and album coherence for release-ready tracks—it's affordable at $10/track or via subscription. Choose Nightingale if you want a free, open-source karaoke solution that turns your local music library into a scoring game with vocal separation and lyric sync—perfect for parties and self-hosters. They serve completely different purposes: mastering vs. karaoke.
Nightingale vs Splice
Splice is the go-to for music producers who need a vast library of royalty-free samples and the flexibility to rent-to-own premium plugins like Serum 2. Nightingale is an excellent free alternative for karaoke lovers who want to sing along to their own music library with professional vocal separation and pitch scoring, but lacks a built-in song catalog. Choose based on whether you need samples (Splice) or karaoke (Nightingale).
Nightingale vs Storyfile
StoryFile and Nightingale solve entirely different problems. StoryFile is for organizations needing authentic, video-based conversational AI for exhibits or legacy preservation—pricey but proven in high-profile museums. Nightingale is a free, open-source karaoke tool for people who already have a music library and want offline, private singing fun. Choose based on your need: historical accuracy or party entertainment.
Alternatives to Nightingale
View allMureka
AI music generator that turns text prompts into royalty-free songs, full vocals, and stems you can mix in your DAW.
Synthesizer V
AI vocal synthesizer that turns lyrics and melody into lifelike singing, with a free tier and advanced Pro editing.
Seed Music
AI music studio that turns prompts, lyrics, and references into structured, track-ready briefs.
Frequently Asked Questions
Best-of guides
Used Nightingale? Help shape our editorial sentiment research.