Stem Splitter Voice Isolation

What it does

StemSplit is a mobile audio tool that uses AI to deconstruct any song into its core components. It isolates vocals, bass, drums, and other instruments, presenting them as individual tracks, or 'stems'. This allows users to create their own mixes, practice specific parts, or generate instrumental versions for karaoke.

Where it shines

StemSplit excels at demonstrating its core value almost immediately. The onboarding flow (00:04-00:32) is a thoughtful journey that first asks what you want to achieve, then seamlessly transitions you into an interactive demo with a popular song. At 00:34, you see the stems for Billie Eilish's 'Bad Guy' already separated and ready to manipulate. The ability to instantly mute the vocals (00:39) or solo the drums (00:51) provides a powerful and tangible 'aha!' moment.

UX highlights

Goal-oriented onboarding. The app uses a multi-step quiz (00:04, 00:14, 00:21) to understand the user's primary motivation, making the experience feel personalized from the start.
Show, don't tell. Instead of ending onboarding with a paywall, the app offers an interactive demo (00:32), proving its capabilities before asking for money.
Clear visual interface. Each stem is represented by a clear icon and its own waveform, making it intuitive to see and control the different parts of the song.
Direct manipulation. Muting and unmuting tracks is a simple tap on a speaker icon, providing immediate auditory feedback.
Focused interaction. The main screen is clean, focusing entirely on the stem tracks and playback controls, avoiding unnecessary clutter.

Monetization & growth

After the user has interacted with the demo, the app presents a paywall for 'Stem Split Pro' at 01:02. The monetization strategy is clear, offering three distinct plans: a weekly subscription, a yearly subscription with a '50% off' discount, and a lifetime one-time purchase. By breaking down the yearly cost to a per-week price ($0.96 per week), the app makes the higher-tier plan seem more affordable. The inclusion of a lifetime option caters to power users who prefer to avoid recurring subscriptions.

Who it’s for

This app is built for a range of audio-focused users. Musicians can use it to isolate and learn specific instrument parts. DJs and producers can grab acapellas or instrumental loops for remixing. Even casual users can use it to create karaoke tracks by removing the main vocals from their favorite songs. The simple interface makes a complex process accessible to more than just audio professionals.

Notes & opportunities

While the interactive demo is excellent, the onboarding quiz is quite long. It asks for three separate categories of input before showing any functionality. Condensing this could get users to the value proposition even faster. Additionally, the in-app rating prompt at 00:05 feels premature, as the user has not yet experienced the core feature. Moving this prompt to after the successful demo could yield more informed and positive ratings.