Best AI Stem Separation Tools Compared (2026)

You need to separate a song into individual stems - vocals, drums, bass, and instruments. Five tools claim to do this well. Their pricing models are designed to make comparison difficult.

Here is an honest breakdown of what each tool actually costs, what quality you get, and which pricing gotchas to watch for.

The Tools

LALAL.AI

Pricing: Lite $3.99/month (90 minutes), Plus $9.99/month (300 minutes), Pro $24.99/month (600 minutes)

The minute multiplier gotcha: LALAL.AI charges by audio minutes processed, not by songs. A 4-minute song costs 4 minutes of your allocation. But if you process the same song for different stem types (vocals, then drums, then bass), each pass costs separately. That 4-minute song processed three ways uses 12 minutes. Your 90-minute Lite plan covers about 22 single-stem extractions or 7-8 full separations.

Quality: Excellent. Consistently among the best for vocal isolation. Supports 10+ stem types including individual instruments (piano, guitar, synth, strings, wind) that most competitors cannot isolate.

Strengths: Most stem types available. Best for isolating specific instruments beyond the standard 4-5. Professional-grade output.

Weaknesses: Minute-based pricing is confusing and expensive for full separations. The Lite plan runs out fast. Subscription required even for occasional use.

Moises

Pricing: Free (limited), Premium $3.99/month (unlimited separations)

Quality: Very good. Slightly behind LALAL.AI on complex arrangements but excellent on commercial music. The gap is most noticeable on dense instrumental sections and drum/bass separation.

Strengths: Unlimited separations at $3.99/month is the best deal for volume. Mobile app is polished. Additional features: key detection, chord identification, tempo control, practice tools for musicians.

Weaknesses: Fewer stem types than LALAL.AI (standard 4-5 stems, no individual instrument isolation). Quality requires the paid tier - free tier output is noticeably degraded. Mobile-first design means the web interface is secondary.

StemStrip

Pricing: Vocal Isolation $1.99, Karaoke Track $1.99, Full Stem Separation $2.99. Per song. No subscription.

Quality: Very good. Uses the same class of models as the competition (Demucs-based). Clean separation on well-recorded commercial music.

Strengths: Per-song pricing means you pay nothing in months you do not use it. No minute calculations, no subscription management, no expiring allocations. Transparent: $2.99 for full stems, done.

Weaknesses: Fewer features than Moises (no practice tools, no key detection). Fewer stem types than LALAL.AI (standard 4-5, no individual instrument isolation). Per-song pricing is more expensive than Moises at high volume.

Splitter.ai (by Deezer)

Pricing: Free (limited, lower quality), Pro from $10/month

Quality: Good. Powered by Deezer's Spleeter model (one of the original AI separation models). Adequate for casual use, slightly behind LALAL.AI and Moises on difficult material.

Strengths: Free tier exists. Backed by Deezer (large company, likely to stay online). Simple interface.

Weaknesses: Free tier quality is noticeably lower. Pro pricing is higher than Moises for less capability. Fewer stem options. Less active development than competitors.

Upscayl / Demucs (Free, DIY)

Pricing: Free. Open source.

Quality: Excellent - Demucs is the model that many commercial tools (including StemStrip) are built on. Running it yourself gives you the same separation quality without paying a service fee.

Strengths: Free. No limits. No subscriptions. Full control over parameters.

Weaknesses: Requires technical setup (Python, command line, GPU recommended). No user interface. No batch processing without scripting. Not an option for non-technical users.

The Real Cost Comparison

Scenario 1: Separate 3 songs per month

Winner: Moises or LALAL.AI (tied at $3.99/month). StemStrip is more expensive at this volume.

Scenario 2: Separate 1 song per month

Winner: StemStrip. You pay $2.99 when you use it, $0 when you do not. Subscriptions charge $3.99 every month regardless.

Scenario 3: Separate 10 songs in one month, then nothing for 3 months

Winner: Moises if you remember to cancel. StemStrip if you do not want to manage a subscription.

Scenario 4: Need piano, guitar, and synth isolated separately

Winner: LALAL.AI is the only option for individual instrument isolation beyond the standard vocal/drums/bass/other split.

Which Tool Is Right for You

You separate songs weekly or more: Moises ($3.99/month unlimited). The math is unbeatable at volume.

You separate songs occasionally: StemStrip ($1.99-$2.99/song). Pay when you need it, nothing when you do not.

You need specific instruments isolated: LALAL.AI ($9.99+/month). The only tool with 10+ stem types including piano, guitar, synth.

You are technical and want free: Demucs. Same quality as commercial tools, zero cost, requires command line comfort.

You want the simplest experience: Moises app. Polished mobile interface with practice tools beyond just separation.

What to Watch For

1. Minute-based pricing is not song-based. LALAL.AI's "90 minutes" sounds like a lot until you realize each stem extraction of the same song counts separately.

2. Free tiers are demos, not tools. Every free tier degrades quality or limits output. They exist to let you test, not to let you work.

3. Subscription cancellation friction. If you subscribe for one month and forget to cancel, you pay for months you did not use. Per-song pricing eliminates this.

4. Quality depends on source material. All tools perform best on well-recorded, professionally mixed commercial music. Live recordings, lo-fi, and heavily compressed audio produce worse results across every tool.

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Separate your first song - per-song pricing, no subscription required.