Demixr

Demixr is a browser-based audio workspace for separating voices and stems, reducing reverb, finding speech segments, and analyzing tempo and key. It is aimed at creators, mixers, and content teams that prefer one upload service over a collection of specialist tools. The trade-off is a tightly capped free tier and quotas that still apply on paid one-time plans.

Overview

Demixr covers several common post-production jobs in one web interface: vocal isolation, instrument-stem separation, dereverb, voice-activity detection (VAD), and BPM/key analysis. That breadth is useful when a project moves between dialogue cleanup, remix preparation, and music metadata. It is less compelling if you need a desktop or mobile app, since processing is upload-based and the only listed platform is the web.

Uploads must be at least 15 seconds. Processing pages allow files up to 200 MB for non-subscribers and 500 MB for subscribers, although each plan imposes its own lower upload ceiling. Audio and generated outputs are deleted within 24 hours by default. Demixr says uploads are not used for training or analysis unless you authorize that, and describes access controls, signed links, and server-side permission boundaries; it also says it does not sell personal data.

Key features

Demixr Pro 1.5 provides two vocal-separation modes. Voice mode is intended for complex mixes, live recordings, and speech over music, while Music mode targets songs, covers, and vocal-versus-accompaniment work. A separate stem tool, powered by Demucs, splits music into vocals, drums, bass, and other. Together these modes make the service more versatile than a single-purpose vocal remover, though choosing the right mode matters for the source material.

Dereverb is best used after vocal isolation. Demixr advises applying it to the separated vocal; running it on a complete mix can introduce artifacts or distortion. That workflow is a practical strength for targeted dialogue or vocal cleanup, but it adds a step for anyone expecting one-click treatment of a finished track.

VAD detects speech segments, lets you edit its markers, and supports batch export. Quiet vocals and noisy recordings can produce inaccurate detection, so it should not be your sole timing reference in difficult material. The BPM tool reports tempo, key, and Camelot values and offers optional tap-to-sync, useful for DJ preparation and remix planning.

Pricing

Go is the sensible entry point for regular short-form work: it removes the free queue and download restriction while providing 10 hours. Plus suits heavier monthly production, and Pro is the only plan matching the 500 MB subscriber maximum and the largest quota. Every paid option is a one-time purchase for the stated one-month period with no automatic renewal, rather than an ongoing subscription. Refund requests are accepted within seven days when paid processing quota has not been materially used. Checkout is handled by Creem and may offer cards, PayPal, Apple Pay, Google Pay, Alipay, and other local methods where available.

Platforms

Demixr runs on the web and accepts audio uploads, exporting WAV on paid plans. There is no separately listed desktop, mobile, or self-hosted version.

Who it's for

Choose Demixr if you are a creator, mixer, or content team that needs separation, cleanup, speech marking, and music analysis in the same browser workflow. The combination is particularly useful for projects that alternate between vocals and full musical stems. It is a poorer fit for large uncompressed files on the Free, Go, or Plus tiers, for noisy recordings where VAD precision is critical, or for users who require continuing subscription billing rather than one-time monthly purchases.

Pros and cons

Pros

• Multiple audio jobs in one service, including Demucs-based four-way stem separation.
• Dedicated Voice and Music separation modes cover complex speech-over-music and conventional song work.
• Editable VAD markers and batch export can accelerate segment preparation.
• Paid plans provide priority processing and WAV downloads.
• 24-hour default deletion and stated non-training use unless authorized address common upload-privacy concerns.

Cons

• The Free plan allows only 10 minutes monthly, 10 MB files, two VAD uses, queued processing, and no WAV downloads.
• VAD can be unreliable with quiet vocals or noisy recordings.
• Dereverb on a full mix may create artifacts or distortion, so vocal isolation is usually required first.
• Paid quotas and fair-use treatment for VAD/BPM still limit sustained heavy use.
• It is web-only and requires uploads of at least 15 seconds.

Alternatives

AI Voice Isolators is the broader category guide for comparing similar tools. Pick AudioShake instead if you want Android, iOS, desktop, API, or self-hosted access, a free trial, and 200 starter credits with MP3 export and 10-minute files. LALAL.AI is preferable when you need broader device coverage and a free relaxed queue with 10 minutes and 200 MB files, though full downloads are unavailable on its free starter offer. Choose Altered Real-Time Pro for desktop speech enhancement, daily processing minutes, and voice skins. VocalDrop fits users wanting a free desktop tool with no track limits, watermark, account, or feature paywall. AIVoiceSeparator is worth considering for web/API access, three free songs monthly, and MP3 320, WAV, or FLAC output plus lyrics, BPM, and key detection. Denoise is the focused mobile choice for Android and iOS denoising. Vocly offers an Android separation workflow with ads and no sign-up. clir Focus is an iOS alternative built around three free sessions and paid monthly access.

Verdict

Demixr is a strong choice for creators and audio teams that want separation, dereverb, VAD, and musical analysis together in a browser. Its main reason to choose it is workflow breadth with paid WAV export and priority queues; its main reason to look elsewhere is the restrictive free tier, plan-specific file caps, and VAD uncertainty on difficult recordings.