Doorbell

What Doorbell does

Doorbell, Inc., operating as Cobu, is a Boston-based B2B SaaS company founded in 2016 that sells a resident engagement and AI search visibility platform to enterprise multifamily property managers. The platform combines community-building tools—including event templates, custom polls, raffles, Google review outreach, and resident-to-resident connections—with a purpose-built AI search visibility layer that ingests authentic resident community data and structures it for AI-driven apartment search engines such as ChatGPT and Gemini. The solution lives on the customer's own property website (rather than a rented listing channel), positioning the property as the asset owner of its own discovery surface.

The product operates as a B2B2C platform: property managers contract with Cobu enterprise-wide and then onboard residents onto the engagement portal. Cobu monetizes via recurring SaaS subscriptions sold per property or per portfolio, using a demo-based field sales motion rather than self-service. Cobu reports enterprise penetration of 9 of the top 10 NMHC (National Multifamily Housing Council) leaders as customers, with named logos spanning investment managers (Invesco, Manulife, AIG, BGO, AEW, CIM), large operators (RXR Realty, Related Companies, Milhaus, Willow Bridge, Avenue 5, KABR, Catalyst Partners, urby). Disclosed outcomes include up to 17% resident retention lift, +10% to +12% renewal rate increases at properties with 69%-92% adoption, and a thesis that resident loneliness (53% of residents report no friends in their community) is a material driver of lease non-renewal that community engagement mitigates.

Name

Doorbell

Legal name

Doorbell, Inc.

Website

https://doorbell.me

Company type

Private

Founded year

2016

Operating status

Operating

Headcount range

1–10 employees

Short description

Doorbell, Inc. (d/b/a Cobu) is a Boston-based B2B SaaS platform that combines resident community engagement tools with AI search visibility optimization for enterprise multifamily property managers, claiming 9 of the top 10 NMHC leaders as customers.

Ownership category

akta.pro rank

Headquarters

HQ city

Boston

HQ country

United States

HQ region

North America

Markets served

GTM type

B2B

Offering type

Software

Cost components

Personnel, Technology or R&D, Marketing or Sales, Operations, Infrastructure

Revenue model

1. SaaS Platform Subscription: Subscription-based platform providing resident engagement and AI search visibility services to multifamily property managers. The platform is sold per property or portfolio to enterprise property management companies.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Doorbell, Inc. (doing business as Cobu) sells a SaaS resident engagement and AI search visibility platform for multifamily apartment communities. The platform helps property managers transform engaged residents into signed leases, 5-star Google reviews, referrals, and higher occupancy by combining community-building tools (event templates, polls, raffles, Google review outreach) with an AI search visibility layer that lives on the property's own website. The platform is sold per property or portfolio to enterprise property management companies and is deployed alongside a B2C resident engagement portal, forming a B2B2C delivery model.

Product overview

Cobu is a unified resident engagement platform for multifamily properties. The core platform (Cobu) combines community building tools—including event templates, custom polls, raffles, Google review outreach, content moderation, and event RSVPs—with AI search visibility capabilities to help properties improve resident retention, generate organic leads, and increase occupancy rates.

Differentiator

Problem solved

Functional benefit

Products and services

• Cobu A unified SaaS platform for multifamily apartment communities that combines community-building tools (event templates, custom polls, raffles, Google review outreach, content moderation) with an AI search visibility layer. It is sold to enterprise multifamily property management companies per property or portfolio, transforms engaged residents into signed leases, 5-star reviews, and referrals, and is deployed on the property's own website so the customer owns the resulting visibility asset.

Quantifiable outcome

• Up to 17% increase in resident retention
• +5 more outcomes

Named customers14 records

Segments6 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Scale indicators6 records

Recent moves5 records

Expansion highlights4 records

Broad incumbents

• AppFolio: Modern property management platform with resident portals, communications, and AI features. Competes for the same property manager buyer and continues to expand resident-facing features that overlap with Cobu's engagement scope.
• RealPage: Incumbent multifamily platform covering property management, resident engagement, marketing, and AI-driven pricing/leasing tools. Overlaps with Cobu at the resident engagement layer and on the AI visibility/leasing funnel, with much larger installed base and data assets.
• Buildium: Larger property management platform owned by RealPage with resident-facing portals and communications tools. Comparable as a SaaS operating layer for property managers and increasingly adding resident engagement capabilities.
• Yardi: Largest incumbent multifamily property management software suite, with RentCafe providing a resident portal layer. Directly comparable as a comprehensive operating platform serving the same property manager buyer and increasingly layering resident engagement and AI-driven features.

Emerging players

• SOCi: Multi-location marketing and AI-driven search/engagement platform for distributed enterprises. Adjacent comparable on AI-mediated local search visibility and resident/consumer engagement mechanics applied to properties.
• Yext: AI search visibility and digital presence platform serving multi-location brands. Closely comparable on the technical AI search visibility / structured data layer Cobu is pioneering for multifamily, though not multifamily-specialized.

Direct peers

• Funnel Leasing: Multifamily-focused CRM and resident engagement platform covering lead-to-lease, communications, and resident lifecycle. Direct overlap on the resident engagement + leasing funnel thesis and on AI-driven leasing automation.
• ResMan: Multifamily property management platform with a resident engagement app covering communications, services, and reviews. Direct overlap on resident engagement features for the same enterprise and mid-market multifamily customers.
• Entrata: Multifamily property management platform with a built-in resident experience layer (events, communications, payments, services). Closely aligned on the resident engagement + operations stack and serves many of the same enterprise property manager customers.
• Knock: Multifamily operating system unifying CRM, property management, and resident engagement with AI-driven responses to prospect and resident inquiries. Closely comparable as an AI-first resident and leasing engagement platform for the same buyer.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights5 records

Customer concentration

• Xtwitter.com/livecobu
• Facebookfacebook.com/livecobu
• LinkedInlinkedin.com/company/livecobu
• Instagraminstagram.com/livecobu

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Doorbell