Fadr

What is Fadr?

Fadr is a browser-based AI stem splitter and music toolkit. Fadr describes itself as a music tech platform with a vocal remover, song splitter, key, tempo and chord detector, remix maker, mashup maker and DJ controller.

The same account also covers Siren and DrumGPT, which turn text prompts into playable instruments and drum kits, plus DAW plugins, two iPhone apps and a developer API.

Fadr is operated by Pebble LLC, which does business as Fadr and is registered in Virginia, United States. Fadr says 95% of the platform is free for unlimited use; the paid Fadr Plus tier unlocks finer stem types, lossless downloads, the plugins and API access.

Core features

The tools share one library: a song uploaded on the Stems page shows up under "My Songs" in the Remix and DJ pages, next to Fadr's own music library packs. That is what lets a single upload become an instrumental, a set of remix tracks or a DJ deck without exporting files between apps.

Stems: vocal remover and song analysis

• Separation and analysis in one pass: The Stems page can remove vocals, separate stems, extract MIDI and the chord progression, and detect the key and tempo of any song.
• Live chord readout: During playback on the Stems page, a chord name updates live along with the song's chord progression.
• Finer splits on Plus: Fadr Plus extracts lead and background vocals separately, splits drums into kick, snare and everything else, and divides melodies into piano, guitar, strings, wind and everything else.
• Pro Stems: Fadr promotes its newest model as "the finest vocal remover and stem separation on the planet delivered in 30 seconds or less"; both the quality and the speed claim are the vendor's own.

Remix maker

The Remix page is an online AI-powered studio for remixes and mashups where you can trim, loop, and change key and tempo while Fadr AI handles synchronization. Clips are dragged into place on a timeline, and each track has its own volume and pan controls. Finished remixes can be shared directly to SoundCloud, with the title, description and genre set from inside Fadr.

DJ page

The DJ page is aimed at people with no DJing experience: it supports real-time mashups and transitions, and Fadr AI handles beat matching. A key selection menu under the BPM display changes the keys of both tracks at once, and pan and volume sliders handle the rest of the mix.

Siren and DrumGPT

Siren is a synth that creates playable instruments from a text description and returns an unlimited stream of options to pick from. Sounds can then be shaped with ADSR envelopes and four filters (low-pass, high-pass, band-pass and notch) at 12 or 24 dB/oct. DrumGPT applies the same idea to percussion, creating playable drum kits from words, online or as a plugin.

Fadr states that all Siren sounds are 100% royalty-free and that anything you create is fully yours; the statement sits in the Siren FAQ and covers Siren-generated sounds.

Guide

Split a song into stems

1. On the Stems page, click "Upload Songs" or drag files onto the page; you can upload .wav, .mp3, .m4a, .aac, .aif or .flac files smaller than 200 MB each, many at once.
2. Wait for processing: stems come back first, then the key and tempo, then the MIDI, and each part can be downloaded as soon as it is ready.
3. Click "Download Stems" or "Download Midi" and pick the stems you need. Fadr's guide calls the difference between high-quality MP3 and lossless WAV nearly indistinguishable and suggests MP3 unless you need the last bit of quality.
4. On Fadr Plus, use the "More Stems" button to unlock the additional drum and melody separations.

Build a remix or a DJ set

1. Open a pack: "My Songs" holds everything uploaded on the Stems page, and the other packs come from Fadr's music library.
2. Click the plus icon next to a song name to add the whole song, or the plus icons below it to add single stems such as vocals, bass or drums.
3. Arrange the clips, then hit export to download the full remix or each individual track as MP3 or WAV; WAV and individual-track downloads require Fadr Plus.
4. For a DJ set, load a track on each turntable; the second track's BPM is automatically changed to match the first, so both play in sync.

Use cases and examples

• Instrumentals and karaoke: Fadr's vocal-removal guide lists social media content, karaoke, background music for presentations and practice as uses for the resulting instrumental track.
• Drumless play-along tracks: An independent drum-magazine review found that the free tier produced usable drumless tracks for most of its test songs, while adding that the results were not better than other free offerings.
• Classroom listening and remix projects: A music educator's blog points out that, because Fadr runs in a browser, students can use it on Chromebooks or any school computer with internet access.
• Stemming inside a DAW session: With the Stems Plugin, you drop the plugin on a track, play the track through to record it, and the stems are extracted in the cloud and saved for muting, soloing and mixing.
• Layered sound design: Siren's product page demonstrates layering, with an orchestra built from three simple prompts all playing the same notes.

Who is it for

Good fit

• Beginners who want to remix: Fadr pitches Remix as a way to remix any song without prior experience, with synchronization handled automatically.
• Producers on several machines: Each Plus subscription can have up to 3 active Fadr VST licenses, so the plugins can be activated on more than one computer.
• Teachers: The educator's blog describes the interface as intuitive enough for middle schoolers but powerful enough for college-level music tech courses.

Less suited

• Drummers learning parts: The same drum-magazine review found that the additional separation in Fadr Plus did not help with drum part learning and removed less percussion from the drumless track when muted.
• Minors: Fadr's Terms of Use require users to represent that they are not a minor in the jurisdiction where they reside.

Platforms

• Web: The core apps run on fadr.com, where you choose between Stems, Remix and DJ, alongside the browser versions of Siren and DrumGPT.
• Stems Plugin: Available for Mac (VST3/AU) and Windows (VST3), and described as working with all major DAWs and anything else that supports VST3.
• Siren plugin: Ships in VST3 format on Windows and in VST3 and AU formats on Mac, with macOS 10.10 Yosemite or higher required.
• Siren iPhone and iPad app: "Siren: AI Piano App" from Pebble LLC is free and requires iOS 16.4 or later. The App Store lookup on October 5, 2026 listed a 4+ content rating and an average of about 4.57 from 110 ratings; the content rating in the lookup may differ from the one shown on the store page.
• Stems iPhone app: "Stems: Split Songs and Vocals", also from Pebble LLC, is free, was released on July 1, 2026, and had a single rating as captured on October 5, 2026, which is too few to judge quality.
• Developer API: The API separates any song into vocals, drums, bass, melodies and instrumental, and also returns MIDI of each stem except drums, the chord progression as text and MIDI, and key and tempo detection. Files used with the API live on Fadr's cloud storage, accessed through temporary presigned upload and download URLs.

In the pages checked this round, no Android app was listed.

Pricing

Fadr Basic is free for life and includes unlimited stems, remixes and DJ sets with high-quality MP3 downloads. Fadr Plus costs $10 USD per month or $100 USD per year, and Fadr accepts all major cards and PayPal.

As captured on October 5, 2026, the pages checked carried a "50% Off Fadr Plus" banner beside "Introducing Pro Stems". The checked pages listed only the $10 and $100 prices and showed no discounted figure or end date for that offer.

Refunds and cancellation

• If you try Fadr Plus and are not 100% satisfied, Fadr says it will refund your most recent payment with no questions asked, but it reserves the right to refuse refunds if you use Fadr Plus extensively.
• You can cancel at any time from the "Subscription" tab on your account page.
• Under the Terms of Use, cancellation takes effect at the end of the current paid term.
• Renewals are automatic: by buying a recurring plan you consent to recurring charges without approving each one, until you cancel.
• All payments are in U.S. dollars, sales tax may be added, and Fadr may change prices at any time.
• Stems made with the Stems Plugin are saved locally and stay on your computer after you cancel, but making new stems needs an active subscription.

API billing

The API requires a Fadr Plus subscription, and that subscription pays for the first $10 of API usage every month. Create Stem Task is currently the only paid endpoint, at US$0.05 per minute of audio. Usage is added to an API balance and charged when it passes your billing threshold, which starts at $10 and rises as you use the API more.

Fadr alternatives

• Moises: A stem-separation service that splits vocals, drums, bass, guitar, keys and more, with desktop, App Store and Google Play apps. Moises says its AI models are trained exclusively on licensed material, a statement about training data that Fadr's checked policies do not make in either direction.
• Ultimate Vocal Remover: A desktop application whose maintainers describe the project as 100% open-source and free for anyone to use and modify. Its Windows installer targets Windows 10 or higher, so you trade Fadr's browser convenience and remix tools for software you install and run yourself.

Limitations

Usage limits

• Song length: Without Plus, the song upload length limit is 10 minutes; Fadr Plus increases it from 10 minutes to 1 hour.
• Cloud dependence: The Stems Plugin has to record audio from your DAW before it can create stems, because the stemming AI is processed on Fadr's servers rather than on your local machine.
• Siren needs a connection: Siren requires internet for login and for generating new sounds, although a loaded sound works offline.
• Outdated plugin docs: The Stems Plugin documentation carries a warning that Stems Plugin v2 has been released and the docs are now outdated.
• Data loss: Fadr's Terms say it performs regular routine backups but that you are solely responsible for the data you transmit and that it has no liability for loss or corruption of that data.

Inconsistent figures on Fadr's pages

• Stem count: The Stems Plugin page refers to separating all 16 stem types. The comparison table on the Plus page lists 18 stem types for Fadr Plus.
• API MIDI output: The API overview says MIDI comes with each stem except drums, but the API billing page lists MIDI of the vocals, drums and bass stems for the same Create Stem Task.

Independent quality signals

• Review-platform rating: On a third-party review platform, Fadr's company profile showed a 4.6 score from 204 reviews as captured on October 5, 2026, with 80% five-star and 14% one-star ratings.
• Recurring complaints: That platform's AI-generated summary of 119 recent reviews says some users found the stem separation occasionally produced poor, gimmicky or incoherent audio, and a few reported difficulty reaching representatives about subscription management.
• DrumGPT accuracy: The independent drum-magazine reviewer called DrumGPT's 16-note kit claim a bit overstated after several generated kits used the same sound for toms 1 and 2.

Privacy and rights

• What counts as a Contribution: The Terms define "Contributions" to include audio and other material you create, submit, post or transmit to Fadr or on the site.
• Broad license to Fadr: By posting Contributions, you grant Fadr an unrestricted, irrevocable, perpetual, non-exclusive, worldwide, royalty-free license to host, use, copy, reproduce, publish, sell and distribute them for any purpose.
• Ownership stays with you: The same section says Fadr does not assert any ownership over your Contributions and that you retain full ownership and associated intellectual property rights.
• Rights warranty: You warrant that you created and own your Contributions or have the necessary licenses, rights and permissions to let Fadr and other users use them.
• API submissions: Content sent through the API is licensed to Fadr perpetually and irrevocably for the sole purpose of providing, securing and improving the API and related services.
• Copyright complaints: The API Terms state that Fadr responds to notices of alleged copyright infringement and terminates the accounts of repeat infringers under the process set out in the U.S. Digital Millennium Copyright Act.
• Deletion and retention: To delete your personal data you submit a support request with your account email, and deletion permanently removes the account. Personal data is otherwise kept only as long as necessary for the purposes in the privacy policy. It may be shared with service providers that monitor and analyze use of the service.
• Model training: In the privacy policy, Terms of Use and API Terms checked this round, Fadr does not state whether uploaded songs or stems are used to train its models, and it does not specify how long uploaded audio files are kept.

FAQ

Q1. Is Fadr really free?

Yes. Fadr Basic is free for life with unlimited basic stems, remixes and DJ sets, but downloads are MP3 only and uploads are limited to 10 minutes per song. WAV files, detailed stems, the plugins and the API need Fadr Plus.

Q2. How much does Fadr Plus cost, and can I get a refund?

Fadr Plus is $10 per month or $100 per year. Fadr offers to refund your most recent payment if you are not satisfied, but it can refuse refunds after extensive use, and cancellation takes effect at the end of the paid term.

Q3. Can I use Fadr inside my DAW?

Yes, with Fadr Plus. The Stems and Siren plugins run in VST3 on Windows and VST3 or AU on Mac, and DrumGPT is also offered as a plugin. Stem separation is processed on Fadr's servers, and Siren needs internet to generate sounds.

Q4. Is there a Fadr app for iPhone?

There are two free iPhone apps from Pebble LLC: Siren for creating instruments from text, and Stems for splitting songs and vocals.

Q5. Who owns the songs and stems I upload?

Fadr's Terms define Contributions to include audio you submit. For Contributions, Fadr asserts no ownership but takes a broad, perpetual license, and you must hold the rights to what you submit.