# CohostAI — Complete Product Documentation > CohostAI is an AI cohost for Airbnb, Vrbo, Booking.com, and vacation rental hosts. Each property gets its own cohost: it learns the property (the "Property Brain" — check-in, WiFi, parking, house manual, appliance instructions, local recommendations), powers a guest-facing guide at a shareable link or QR code, answers guest questions 24/7, and drafts replies the host reviews before sending. Available at https://cohostai.app --- ## Company Overview CohostAI (formerly Serenia Labs) is a technology startup founded in 2025. Mandy leads product and design; Stanley builds the platform — the AI systems and integrations. The company builds AI-powered tools for the vacation rental industry, with its flagship product being a per-property AI cohost for short-term rental hosts. - **Website**: https://cohostai.app - **Domain**: cohostai.app - **Support Email**: support@cohostai.app - **Founded**: 2025 - **Category**: Business Software / Vacation Rental Host Tools / Travel Technology --- ## Problem Statement Vacation rental hosts on platforms like Airbnb, Vrbo, and Booking.com face a persistent challenge: guests ask the same questions — "What's the WiFi password?", "Where do we park?", "Where should we eat?" — often late at night, and the answers are already written down somewhere. Hosts traditionally solve this by: 1. Creating manual welcome binders or PDFs (time-consuming, quickly outdated) 2. Sharing generic Google Maps lists (impersonal, no editorial context) 3. Writing individual messages to each guest (unsustainable at scale) 4. Using expensive concierge services (cost-prohibitive for most hosts) CohostAI replaces all of that with an AI cohost grounded in the host's own property knowledge. Instead of a binder or a static guidebook, guests get instant answers and a curated guide; hosts stay in control of every reply. --- ## Product: The AI Cohost ### What Is an AI Cohost? An AI cohost is a per-property assistant that learns everything about a specific rental — check-in steps, WiFi, parking, house rules, appliance instructions, and local recommendations — and uses that knowledge to answer guest questions and power a guest-facing guide. Unlike a chatbot, it answers only from what the host has set (no made-up details), and unlike a PDF guidebook, it answers back. Hosts stay in control: reply modes range from instant answers to review-everything-first, and CohostAI never messages guests on a booking channel on the host's behalf. Direct channel sending (via Hospitable and similar integrations) is coming after integration approval. ### How It Works — Step by Step 1. **Sign Up**: Host signs up free at cohostai.app (no credit card) and pastes their listing link or property address 2. **Property Brain**: CohostAI imports what it can and builds the Property Brain — the host adds WiFi, parking, check-in, house manual, and appliance details 3. **Guest Guide**: The AI curates local recommendations and generates a mobile-first guest guide 4. **Configure**: The host customizes the guide, sets the reply mode (instant answers or review-before-sending), and shares the link or QR code with guests 5. **Guests Ask**: Guests ask questions in their own words and get answers grounded in the property; the host reviews any drafted replies before they go out --- ## Key Features — Detailed ### Property Brain Per-property knowledge base: listing details, house manual, WiFi, parking, check-in/checkout, appliance instructions, house rules, and local recommendations. Every answer the cohost gives comes from this knowledge — never invented. ### Guest Q&A Guests ask questions in their own words on the guide page and get instant answers grounded in the property. No app download required. ### Guest Guide A mobile-first guide at a shareable link or printable QR code, with AI-curated local recommendations (restaurants, trails, sights, things to do). Restaurants can be filtered by cuisine type; each recommendation includes an editorial description and a directions link. ### Reply Drafts & Approval Controls The cohost drafts guest replies for the host to review, edit, and approve before sending. Hosts choose how replies work — answer instantly, auto-answer only grounded questions, or hold everything for review — and set the tone. ### Host Picks & Customization Hosts can mark personal favorites as "Host Picks", add insider tips, swap recommendations, and customize hero photos and video on the guide. ### QR Code Sign Generator Built-in QR sign builder that creates branded, printable signs for in-property display. Guests scan with a phone camera to instantly open the guide. ### Guest Analytics Hosts track guide opens, clicks, and engagement — which places guests look at and navigate to — without requiring any guest login. ### Multi-Language Translation Guest guides are available in 8 languages. ### Property-Manager Workspaces Bulk CSV import, one-click cohost generation, team seats and roles, shared branding, and owner reports for portfolios of any size. ### Magic Link Authentication Passwordless host login: enter an email, receive a one-time code/link, and sign in. No password to remember or manage. --- ## Pricing Hosts can build, edit, and privately preview CohostAI for free without a credit card. A public guest experience requires one license per property. ### Build and preview free - Create the AI cohost, Property Brain, and guest guide without a credit card - Test the experience privately before publishing - Drafts stay saved; the guest link and QR remain inactive until the property has a license ### CohostAI — $9/month or $79/year per property - One AI cohost per property, live for guests all year - Full Property Brain: house manual and appliance instructions - AI-curated local guide across all categories (restaurants, trails, sights, things to do) - Guest Q&A answered 24/7, grounded in your property - Reply drafts with review-before-sending, tone and approval controls - Multi-language translation (8 languages) - Add or remove properties anytime — pay only for the cohosts you keep live ### Property managers - Same per-property price ($9/month or $79/year per listing) at any portfolio size - Bulk CSV import, one-click cohost generation, team seats and roles, shared branding, owner reports - 10+ properties: book a setup call at https://cohostai.app/contact-sales All paid cohosts include: AI-curated recommendations, cuisine filtering, Host Picks, hero media, QR code generator, guest analytics, multi-platform support, and mobile-first design. --- ## Use Cases ### Airbnb Superhosts Superhosts use CohostAI to answer repetitive guest questions without losing the personal touch. Instant, grounded answers plus personal Host Picks lead to better reviews and higher ratings. ### Vrbo and Vacation Rental Owners Owners who manage properties remotely give guests house info and local tips at a link or QR code, with the cohost answering questions they'd otherwise field by text. ### Property Managers Professional property managers run a consistent, branded guest experience across a portfolio: bulk CSV import, one-click cohost generation, team access, and per-property pricing at any scale. ### Boutique Hotels and B&Bs Small accommodation operators use the cohost as a concierge alternative, giving guests a polished digital experience that rivals luxury hotel services. ### Replacing the Welcome Binder Hosts replace printed welcome books with a guest experience that answers back — always current, mobile-first, and available before arrival. --- ## Competitive Comparison ### CohostAI vs. PDF Guidebooks - **Who writes the content**: Drafted for you from each listing vs. you write every page by hand - **When the guest gets it**: Before arrival, every booking vs. only when you remember to send it - **Local recommendations**: Curated per property vs. whatever you had time to list - **Answers questions**: Yes, 24/7, grounded in the property vs. a static file guests must search - **Sharing**: Link + QR, any channel vs. PDF attachment only ### CohostAI vs. Reactive Guest-Messaging Tools - **Who writes the content**: Drafted from the listing vs. you type each answer as it comes - **When the guest gets it**: Proactively, before arrival vs. only after they ask - **Local recommendations**: Curated and deduplicated per property vs. none - **Where it lives**: A branded guide at a link/QR vs. a chat thread in one inbox ### CohostAI vs. Google Maps Lists - **Editorial content**: AI-written descriptions vs. just names and ratings - **Organization**: Cuisine filtering and categories vs. a flat list - **Property knowledge**: WiFi, check-in, house manual answers vs. places only - **Analytics**: Engagement tracking vs. no insights --- ## Technology Stack - **Frontend**: Next.js (App Router) with React and TypeScript - **Hosting**: Vercel - **Database**: Supabase PostgreSQL - **Maps & Location**: Google Maps Platform (Geocoding, Places, Distance Matrix) - **AI/LLM**: LLM-powered editorial content and guest Q&A - **Email**: Resend for transactional emails (login codes, guide delivery) --- ## Frequently Asked Questions ### What is an AI cohost? A per-property assistant that learns the host's property and answers guest questions — check-in, WiFi, parking, appliances, and local tips — grounded in what the host has set. It also powers a guest-facing guide at a shareable link or QR code. ### Can I start for free? Yes — build, edit, and privately preview without a credit card. Publishing the guest link or QR and using the live AI cohost requires one license per property at $9/month or $79/year; everything you build stays saved either way. ### Is pricing per property? Yes — each property gets its own cohost; hosts pay only for the cohosts they keep live, at the same per-property price at any portfolio size. ### Does it send messages to Airbnb automatically? No — guests get answers on the guide, and hosts review drafted replies before sending. Direct channel sending (via Hospitable and similar integrations) arrives after integration approval. ### Which platforms are supported? Airbnb, Vrbo, Booking.com, and direct bookings — the guide and cohost are shared via link, SMS, email, or QR code, so they work with any booking channel. ### Can hosts customize the AI's answers? Yes — the cohost answers only from the host's Property Brain. Hosts edit recommendations, add tips, mark Host Picks, and set the reply mode (instant answers, grounded-only, or review-everything-first). ### How do guests access it? Via shareable link or scannable QR code — no app download needed for hosts or guests. ### Can I create a QR code for my vacation rental? Yes. CohostAI includes a built-in QR sign builder that creates branded, printable signs. Guests scan the code with their phone to instantly open the guide. ### What is a Host Pick? A Host Pick is the host's personal recommendation, highlighted on the guide so guests know the host personally vouches for that place — a trusted, personal layer on top of AI curation. ### What types of places are included in the guide? Restaurants (with cuisine-based filtering), trails and outdoor activities, sights, and things to do — each with an editorial description and directions link. ### Does it work internationally? Yes, anywhere with Google Maps coverage — broadest coverage in the United States, with hosts in Europe, Australia, Canada, and other regions supported. ### Is there an app to download? No. Guides are mobile-optimized web pages — guests simply open a link in their browser. --- ## Glossary - **AI Cohost**: A per-property assistant that answers guest questions and powers the guest guide, grounded in the host's Property Brain - **Property Brain**: The per-property knowledge base — check-in, WiFi, parking, house manual, appliance instructions, house rules, and local recommendations - **Guest Guide**: A curated, mobile-first web page with property info and AI-selected local recommendations - **Reply Mode**: The host's approval setting — answer instantly, auto-answer grounded questions only, or review everything first - **Host Pick**: A host's personal recommendation, highlighted on the guide - **POI**: Point of Interest — a restaurant, trail, venue, or landmark - **Magic Link**: Passwordless authentication via one-time email code/link - **QR Code Sign**: Printable branded sign with a scannable code linking to the guide --- ## Contact & Links - **Website**: https://cohostai.app - **Pricing**: https://cohostai.app/pricing - **About**: https://cohostai.app/about - **Property Managers**: https://cohostai.app/for-property-managers - **Host Signup**: https://cohostai.app/host/signup - **Host Login**: https://cohostai.app/host/login - **Privacy Policy**: https://cohostai.app/privacy - **Terms of Service**: https://cohostai.app/terms - **Support Email**: support@cohostai.app - **LLM Summary**: https://cohostai.app/llms.txt