StemPlayer VS AgentClara

StemPlayer's answer

• React and Vite for the browser app, hosted on Cloudflare Pages
• Web Audio API for the mixer, with time-stretching so a slowed-down song keeps its pitch
• Python and FastAPI for the backend
• Demucs, a neural network for music source separation, running on a cloud GPU
• Browser storage (IndexedDB) for the song library, so songs stay on your device

AgentClara's answer:

A React and TypeScript web application on a Postgres backend, with real-time voice handled over a persistent WebSocket bridge for low-latency conversation. Large language models power the conversational layer, with dedicated speech and telephony infrastructure for calls, plus integrations for calendars, messaging channels and payments.

StemPlayer's answer

Six stems with dedicated guitar and piano channels, opened straight in a practice mixer in the browser. You do not get a zip of files to take somewhere else: you mute your part, slow the song down without changing the pitch, loop a section and play along, all in one place, with nothing to install.

AgentClara's answer:

Most AI receptionists answer the phone. Clara staffs the whole front desk: she answers every call 24/7, books clients straight into your live diary, chases enquiries that didn't book, and covers your website chat, SMS, social media inbox and email — with those extra channels included free, not sold as add-ons. She's UK-built, GDPR-native, priced in pounds, and you set her up yourself online in minutes with a free number and £100 of credit — no sales call, no quote.

StemPlayer's answer

Moises and LALAL.AI are subscriptions and cap free use hard; Ultimate Vocal Remover is free but needs installing and a good graphics card. StemPlayer runs in any browser, on a laptop or a phone, is free while in beta, and is built for playing along rather than producing.

AgentClara's answer:

Three reasons. First, channels: rivals are phone-first, so DMs and web chat go unanswered — Clara covers every channel in one place. Second, booking: many entry plans only take messages or send a booking link; Clara books the appointment during the call and sends the confirmation. Third, no sales process: the big UK incumbents quote you after a consultation, while Clara is self-serve with £100 of free credit so you can test her on your real calls before paying anything.

StemPlayer's answer

Musicians who learn and practise songs by ear: guitarists, bass players and drummers who want to play their part with the real band, singers who need an instrumental, and teachers preparing play-along tracks for students.

AgentClara's answer:

UK service businesses that lose money to missed calls — gyms, salons, aesthetics clinics, dental practices, estate agents and law firms — where one missed enquiry is a lost booking worth hundreds. The second audience is agencies and resellers who want to offer AI receptionists to their own client book without building the technology themselves.

StemPlayer's answer

I am a gigging guitarist, and learning a part from a record always meant fighting the original guitar in the mix. Stem separation fixed that, but every tool either charged monthly, stopped at four stems, or dumped files I had to load into a DAW. I wanted to drop in a song, pull my part out and play. So I built StemPlayer for my own practice and opened it up for other musicians.

AgentClara's answer:

AgentClara was built by a Glasgow gym owner who kept losing members to unanswered calls. The phone rang mid-class, the Instagram DM arrived at 10pm, and the customer joined the gym down the road — not because the service was worse, but because nobody answered. Clara was built to be the employee that always answers, and now does the same job for service businesses across the UK.

StemPlayer's answer

• StemPlayer is a free beta used by individual musicians: guitarists, bass players, drummers, singers and music teachers. It has no business customers.