Slang.ai is a voice-only AI host for restaurants. Solwees runs the same voice line plus WhatsApp, Instagram DM, web widget and email, in 50+ languages, and writes confirmed bookings into the booking CRM you already use.
About a third of inbound restaurant contact in 2026 happens on WhatsApp, Instagram DM or the website widget. Not the phone. Slang.ai handles the phone beautifully but leaves the other channels to whoever is at the host stand. Solwees runs all of them in one inbox, with the same AI behavior.
Slang.ai supports a small set of languages and does not switch mid-call when a guest answers in their own language. Solwees detects the caller language from the first words and runs the whole conversation in it, then switches if the guest mid-call asks for another language.
Slang.ai is priced around $199 to $399 per location per month, in USD, with data in the US. For an independent restaurant in Madrid, Berlin or Tallinn that is high relative to revenue, plus the EU data residency conversation has to happen separately. Solwees is €39 to €499 / month, hosted on AWS Frankfurt.
| Solwees | Slang.ai | |
|---|---|---|
| Channels handled by the AI | Voice + WhatsApp + Instagram DM + web widget + email | Phone only |
| Languages | 50+, auto-detect, mid-call switch | Limited set (English-first), no mid-call switch Based on Slang.ai public docs as of 2026-05. |
| Voice latency | Under 800ms, 50+ languages with mid-call switch | Comparable on phone |
| Booking CRM integrations | Native: SevenRooms, OpenTable, CoverManager, Mozrest, Google Calendar | OpenTable + SevenRooms via webhooks |
| Deposit / pre-payment | Stripe, per-service, refundable | Not native |
| Pricing | AI from €99 / month (SOLO), flat subscription | Core from $399 / month per location, Premium from $599 Based on Slang.ai public pricing as of 2026-05. |
| Hosting and compliance | AWS Frankfurt, GDPR-ready (SOC 2 + ISO 27001 in progress) | US-hosted, EU data handling varies |
| Mobile takeover by human staff | iOS + Android app, one-tap takeover | Browser dashboard only |
We update this table as competitor pricing changes. Last reviewed: 2026-05.
The same knowledge base, same tone of voice, same hand-off rules. A guest who DMs your Instagram at 23:00 and then calls the next morning gets a coherent conversation, not two different bots that do not know about each other. Slang.ai by design only owns the phone.
A French guest calling your restaurant in Barcelona starts in Spanish, then says "I prefer French, sorry". Solwees switches the conversation language on the next utterance and keeps full context. The booking still lands in the CRM with all the right notes.
Either keep your existing phone provider and forward to the Solwees Twilio number, or port the number to us directly. Most teams forward first for one week as a safety net.
OAuth into SevenRooms, OpenTable, CoverManager, Mozrest or Google Calendar. Working hours, services, staff and prices are pulled automatically. This is the same step you did with Slang.ai, just against more systems.
WhatsApp Business is the most common second channel. The web widget on your booking page picks up after-hours visitors. Instagram DM ties to your business account.
After 1 to 2 weeks of parallel running, point your number fully at Solwees. Cancel Slang.ai. No data migration is required because Slang.ai never owned the booking calendar.
Slang.ai built a reputation on natural-sounding restaurant phone calls. That is real, and on the phone Solwees is competitive on the same dimension (sub-800ms response, no robotic pauses). But for an independent restaurant in 2026 the phone is one of four or five channels that guests actively use. The win condition is not "best voice on the phone". It is "no missed contact, on any channel, in any language, after hours".
Solwees was built channel-first. The same agent persona, knowledge base and CRM hand-off logic runs on voice, WhatsApp, Instagram DM, the website widget and email. You configure it once, and the guest experiences a coherent venue regardless of where they reach out from.
For a restaurant in a tourist-heavy European city, 30 to 50 percent of inbound voice calls and WhatsApp messages are in a language other than the local one. Slang.ai performs best in English. Solwees handles 50+ languages with detection on the first utterance and a mid-call switch when a guest asks. The practical effect is fewer "I will call you back" situations and a much higher booking conversion from non-local guests.
For chains operating across borders, the per-location language config in Solwees lets you set primary plus fallback languages for each venue, so a Berlin location defaults to German + English while a Paris location defaults to French + English, all under one workspace.
If your restaurant is in the US, English-only, and the phone is genuinely 90% of your inbound, Slang.ai is a clean product focused on doing exactly that. The voice persona is excellent, the brand is well known in US hospitality, and the OpenTable/SevenRooms webhook flow is mature. You will pay more, but you are paying for a polished single-channel experience.
Solwees is the better answer when you operate in multiple languages, when WhatsApp or Instagram already drive bookings for you, or when EU data residency matters to your guests or your lawyers.
We run a guided demo on your menu or service list and show you the booking flow we'd put in place. No prep needed.