Stemzel vs STEM
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stemzel
This app separates any song into vocals, drums, bass, and other instruments directly on your device. It offers on-device AI processing for privacy, with no cloud uploads or subscriptions required. Mix, mute, solo, and export individual stems or the full mix.
- On-device AI stem separation
- Import audio from files or URL
- Record and split audio instantly
- Mute or solo individual stems
- Built-in waveform scrubber
- Export stems and full mix
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Stemzel splits any song into four stems — vocals, drums, bass, and other instruments — entirely on your iPhone. No cloud uploads. No subscription. No account required. IMPORT YOUR AUDIO • File — pick from Files, iCloud Drive, or anywhere on your device • URL — paste a direct link to an MP3, M4A, or WAV file • Record — capture audio with your microphone and split it instantly MIX AND EXPORT • Mute or solo any stem to hear exactly what you want • Play back your mix with a built-in waveform scrubber • Export individual stems or your full mix to the Files app PRIVATE BY DESIGN Every split runs on your device using on-device AI. Your music never leaves your iPhone. No servers, no tracking, no ads. ONE-TIME UNLOCK Pay once, use Stemzel forever. Unlimited splits and downloads — no monthly fees, ever. PERFECT FOR • Musicians learning parts by ear • DJs and producers isolating elements • Karaoke and acapella practice • Remixing and sampling workflows • Anyone who wants stems without uploading to the cloud Stemzel is built for speed and privacy. Import a track, wait a moment while it separates, then mute the vocals, solo the drums, or export everything — all from your pocket. Questions or feedback? Visit stemzel.com/support
STEM
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FUSE VOID STEM-X is the ultimate professional AI audio separation tool, built for producers, DJs, vocalists, and cover artists who demand perfection. Powered by advanced dual-AI hybrid engines, STEM-X extracts studio-quality stems directly on your device. Whether you need a pristine vocal acapella for a remix, a high-fidelity instrumental for karaoke, or an isolated drum groove, STEM-X delivers with industry-leading speed. FEATURES: • State-of-the-Art AI Engines: Choose between Vocal Priority (2-Stem) or Full Band Extraction (5-Stem). • Studio In Your Pocket: Process your audio files securely with lightning speed. • Pro Audio Export: Extract and export uncompressed, high-fidelity stems to your DAW or files. • Fair Quota System: Only pay for the seconds you extract. No wasted credits on full songs when you only need a loop! • Minimalist Studio Interface: Designed with a dark, premium aesthetic that feels like high-end studio hardware. Unleash your creativity, practice your covers, and remix the world with FUSE VOID STEM-X. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is iOS requirement: STEM at 16.4 against Stemzel's 26.0. On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Stemzel sells 4 one-off in-app purchases and STEM sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
| Parameter | Stemzel | STEM |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (2 ratings) — better | — |
| Number of ratings | 2 — better | — |
| Update frequency | — | Every 9 days |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 26.0 | 16.4 — better |
| Further details — not scored | ||
| Size | 290 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | Mahija Kottapalli | CEM OZAN DUZENCI |
In-app purchases
Stemzel
- Small Tip$0.99
- Medium Tip$2.99
- Large Tip$4.99
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- Stemzel Unlock$7.99
STEM
- Starter Monthly$7.991 Month
- Basic Plan$12.991 Month
- Pro Plan$24.991 Month








