Slow Down
The all-in-one music practice toolkit for serious musicians
Slow down YouTube videos, detect BPM and key, reduce vocals, write notation, track your progress, and more — all free
Practice Any Song Your Way
Import YouTube videos or upload your own audio files — then use powerful tools to break down and master every passage
Speed Control
Slow down from 0.1x to 4x speed to catch every note of a fast solo or complex passage
Loop Sections
Set start and end points to repeat difficult sections automatically until you nail them
Markers
Bookmark timestamps to jump back to the verse, chorus, or solo instantly
Pitch Shifting
Transpose up or down by semitones to match your instrument's tuning or vocal range
Instant Audio Analysis
Slow Down automatically extracts musical data from your videos so you can focus on playing, not figuring out the basics
BPM Detection
Auto-detect the tempo and see it adjust in real time as you change speed
Key Detection
Identify the musical key instantly — no more guessing which scale to play over
Chord Detection
See the chord progression laid out so you can follow along or chart the changes
Vocal Reducer
ML-powered vocal isolation lets you remove or enhance vocals to practice along with the band
Write and Share Sheet Music
A built-in notation editor designed for musicians — transcribe solos, write exercises, build teaching materials, and share them with the community.
- Point-and-click note entry with keyboard shortcuts
- Tablature for guitar, bass, mandolin, banjo, and violin
- Dynamics, articulations, slurs, grace notes, and more
- Attach sheets to videos so others can practice along
- Built-in playback to hear what you've written
Standard notation + tab
With professional engraving
Your Complete Practice Toolkit
Everything you need to practice effectively — built into one app
Practice Tracking
Automatic session logging with a practice calendar, daily breakdowns, streak tracking, and monthly summaries.
Metronome
Built-in metronome with tap tempo, subdivisions, swing, accent patterns, and a gradual tempo trainer.
Music Theory Course
Learn scales, chords, intervals, rhythm, and progressions with interactive notation examples and playback.
Playlists
Organize videos into playlists. Import entire YouTube playlists with one paste and sync them to pull in new additions.
Leaderboards
Compete across categories like practice time, mastery, and diversity. Track your rank history over time.
Upload Audio
Not just YouTube — upload your own MP3, WAV, FLAC, or video files to practice with the same full toolkit.
Practice Together
Follow other musicians to see what they're practicing. Share your videos, playlists, and sheets with friends, students, or teachers.
- Follow musicians and see their practice activity
- Share videos, playlists, and sheet music publicly
- Comment on videos and discuss techniques
- Like and save content from other musicians
A growing community
of musicians who practice together
Practice Anywhere, On Any Device
Slow Down is completely mobile friendly — including the notation editor. Start practicing on your laptop, pick up on your phone. Your videos, markers, loops, sheets, and progress sync across all your devices.
Get Started in Seconds
Three steps to start practicing at any speed
Add a Video
Paste a YouTube link, import a playlist, or upload your own audio file — any source works.
Slow Down & Analyze
Adjust speed, detect BPM and key, reduce vocals, shift pitch — everything updates in real time.
Loop, Learn, Master
Create loops, add markers, write notation, track your practice — and watch yourself improve.
Ready to level up your practice?
Join musicians who use Slow Down to practice smarter. No subscription required, no hidden fees.
No credit card required. Sign in with Google to get started.
Love the app? You can optionally support development to help keep it running.
Frequently Asked Questions
Is Slow Down free?
Yes! Slow Down is completely free to use with no limits on videos, markers, loops, sheets, or sharing. I built this as a passion project and want it to be accessible to every musician. If you find it useful, you can optionally become a supporter to help cover hosting costs and fund development. If costs grow significantly in the future, I may need to introduce a paid tier, but the goal is to keep the core experience free for as long as possible.
How does the audio analysis work?
BPM, key, and chord detection run automatically when you analyze a video. The detected BPM adjusts in real time as you change playback speed — so if a song is 120 BPM and you slow to 75%, it shows 90 BPM. Vocal reduction uses ML-powered spectral processing to isolate or remove vocals directly in your browser.
What are loops and markers?
Markers let you save specific timestamps in a video so you can jump back instantly. Loops let you select a section to repeat automatically — set the start and end points, and the video will loop that section until you've mastered it.
Can I change the pitch / transpose?
Yes! For uploaded audio files, pitch shifting works directly in your browser — shift up or down by semitones with high-quality audio. For YouTube videos, pitch shifting requires the free Slow Down Chrome Extension, which works with Chrome, Edge, Brave, Arc, and other Chromium-based browsers.
Can I upload my own audio files?
Absolutely! You can upload MP3, WAV, OGG, FLAC, AAC, M4A audio files, or MP4, WebM, MOV video files. Uploaded files get the same full practice toolkit — speed control, pitch shifting, looping, markers, vocal reduction, and analysis.
Can I share videos with my teacher or students?
Yes! You can share individual videos, curated playlists, or sheet music with anyone. Your markers, loops, and notation are included so others can practice the same sections you've highlighted.
How can I support Slow Down?
If you find Slow Down useful, you can become a supporter with an optional monthly or yearly subscription, or make a one-time donation. This helps cover hosting costs and funds continued development. Every bit of support is genuinely appreciated and helps keep the app free for everyone.
Become a SupporterBuilt for Musicians — Useful for Everyone
Slow Down is designed for music practice, but anyone who needs to slow down and study video content can benefit
Musicians
Learn solos, transcribe, and master difficult passages
Music Teachers
Create and share sheet music, exercises, and playlists
Dancers
Slow down choreography to learn step by step
Language Learners
Slow down native speakers to catch every word
Built by a Team of One
Hi, I'm Theo Wecker — a musician and software developer who built Slow Down to help myself and others practice more effectively. What started as a personal tool has grown into something I'm excited to share with musicians everywhere.
Have suggestions, feedback, or just want to say hi? I'd love to hear from you! Send me an email — every message is read and appreciated.
Why Slow Down | Ralenty?
The name Slow Down is inspired by the French word ralenti — which means "slowed down" or "in slow motion." It comes from the verb ralentir, meaning to slow down. In French film and music, au ralenti describes that beautiful moment when everything slows to a crawl and you can appreciate every detail.
That's exactly what this app does for practice — it lets you experience music au ralenti, catching every note, every rhythm, every nuance that flies by at full speed.
Ralenty — our alternate name — is a playful twist on ralenti and ralentir. It's a nod to the French roots of the idea, made our own.
As a dedicated French learner myself, I love the connection between language and music — both require patience, repetition, and the willingness to slow down and really listen.