Diffee VS BeepSweep

BeepSweep's answer:

Two separate systems with a signed link between them.

The app runs on Node.js with Express, server-rendered Nunjucks templates and Postgres. The front end is plain JavaScript with no bundler, plus a service worker for push notifications and offline use.

The call engine runs on Python with FastAPI, built on pipecat, and uses OpenAI's gpt-realtime for speech to speech. There is no separate speech recognition and speech synthesis step in between. Telephony runs over Telnyx with TeXML, audio in G.722 wideband.

Between the two sits an HTTP link signed with HMAC-SHA256 in the Stripe style. The call engine posts conversations and events to the app and pulls its configuration and routing from there.

Hosting is in Amsterdam on Fly.io. Sensitive fields such as summaries, transcripts, phone numbers and keys are encrypted in the database with AES-256-GCM.

BeepSweep's answer:

Businesses where the phone matters and several people answer it: from installers and hair salons to restaurants, hotels and offices.

What they have in common is a situation rather than an industry: they can't always pick up, and a missed call costs them a customer or an appointment.

Working on your own? Solo is the personal version: a receptionist for your own mobile number, for €25 a month.

It is not built for call centres.

BeepSweep's answer:

Most AI receptionists stop at picking up the phone. BeepSweep finishes the job: it answers questions from your own website, books, moves or cancels the appointment in the calendar or booking system you already use, and puts the caller through to the right colleague when a person is needed. Customers can also be helped through WhatsApp.

The same receptionist can answer your own mobile when you can't pick up, so you see right away who called and why.

It talks speech to speech in one model, instead of turning the caller's voice into text and back. Fewer steps means less delay, and there is no recognition step in which a name gets written down wrong.

BeepSweep's answer:

Choose BeepSweep if calls interrupt your work and you want them handled, not just noted down.

Predictable price. Enterprise is a fixed €99 a month, plus €15 per extra colleague, excluding VAT. No per-call charges, so it stays affordable when callers take their time.

It does the work. Questions answered, appointments booked in your own system, callers transferred to the right colleague, and customers helped through WhatsApp.

Nothing changes for callers. Your number stays yours; you only switch on call forwarding.

Your data stays in Europe. Hosted in Amsterdam, encrypted, never used to train models.

Where others fit better: if you need a full call centre or a fully custom voice agent, pick a platform built for that.

BeepSweep's answer:

BeepSweep started with a frustration: voicemail. Callers hang up on the beep, and the ones who do leave a message only say "call me back". You end up with a name and a number and no idea what it was about.

So the first version turned missed calls into readable messages. From there it grew into what businesses actually need: a receptionist that answers the call, helps the caller, books the appointment and puts them through to the right colleague.

Built in the Netherlands and founded by Noah Niese in 2026.