Zadarma
Zadarma is a bootstrapped Bulgarian cloud communications provider offering Cloud PBX, virtual numbers in 110+ countries, SIP trunking, and AI voice services to SMBs, call centers, and enterprises across 160 countries, with 2.5M+ users.
- Company typePrivate
- Founded2006
- HeadquartersBurgas, Bulgaria
- Headcount101–250
- GTM typeB2B
- OfferingSoftware
What Zadarma does
Zadarma is a privately held cloud communications platform founded in 2006 and headquartered in Burgas, Bulgaria, operating through a multi-jurisdictional corporate group spanning Bulgaria (IP Telecom Bulgaria LTD), the UK (Smartvoice LTD), Spain (Voice Cloud S.L.), and the United States (Kosmaz Technologies LLC). The company delivers VoIP infrastructure including Cloud PBX, virtual phone numbers in 110+ countries, SIP trunking, and a suite of add-on modules such as Teamsale CRM, SMS, Click-to-Call, Call Tracking, HLR Lookup, AI Speech Analytics, and an AI Voice Agent. The underlying platform runs across six data centers on three continents with 99.9% SLA uptime, supports TLS/SRTP-encrypted SIP interconnects, and is ISO/IEC 27001 certified and GDPR compliant.
The product portfolio is anchored on a free Cloud PBX configured in approximately five minutes, with monetization through tiered subscription plans (Standard free, Office at $39/month for 10 users, Corporation at $79/month for 20 users), recurring virtual number fees starting at $2/month, per-second outbound usage billing, and usage-based HLR lookup at $0.007 per query. The company runs a primarily self-serve, product-led growth motion supplemented by API-first developer access, a partner program, and enterprise direct sales, targeting SMBs, call centers, enterprises needing SIP trunking, and distributed remote teams. Go-to-market is supported by native integrations with Salesforce, HubSpot, Zoho, Zendesk, Microsoft Teams (Direct Routing), Freshdesk, MS Dynamics 365, and messaging platforms.
Zadarma is bootstrapped (no disclosed venture or institutional funding), yet has executed two acquisitions — VoIPVoIP (US, 2024) and Megacall (Spain, November 2025) — and in January 2026 launched a multilingual AI Voice Agent built on OpenAI's ChatGPT with planned Gemini support. The company reports more than 2.5 million registered users across 160 countries and 19 years of continuous operation. Revenue is not publicly disclosed.
Zadarma firmographics
Firmographics- Name
- Zadarma
- Legal name
- Zadarma
- Website
- https://zadarma.com
- Company type
- Private
- Founded year
- 2006
- Operating status
- Operating
- Headcount range
- 101–250 employees
- Short description
- Zadarma is a bootstrapped Bulgarian cloud communications provider offering Cloud PBX, virtual numbers in 110+ countries, SIP trunking, and AI voice services to SMBs, call centers, and enterprises across 160 countries, with 2.5M+ users.
- Ownership category
- akta.pro rank
Zadarma industry classification
Industry- Product category
- Cloud Communications / VoIP Services
- NAICS
- Wired and Wireless Telecommunications (except Satellite) (5171), Telephone Call Centers (56142)
- SIC
- Services-Telephone Interconnect Systems (7385)
- akta.pro primary industry
- Cloud PBX & Hosted Telephony (HDAIAHAB)
- akta.pro secondary industries
- Conversational AI Platforms (chat/voice bots, orchestration) (HDAAAFAC), Contact Center (CCaaS) & Customer Engagement Voice (HDAIAHAF), Collaboration & Unified Communications Management (UCaaS/VoIP) (BPAEABAK)
Keywords
Where Zadarma is headquartered
LocationHeadquarters
- HQ city
- Burgas
- HQ country
- Bulgaria
- HQ region
- Europe
Offices5 records
Markets served
Zadarma business model
Business model- GTM type
- B2B
- Offering type
- Software
- Cost components
- Technology or R&D, Infrastructure, Personnel, Marketing or Sales, Operations
Revenue model
- Subscription - PBX Plans: Monthly/annual subscription plans for cloud PBX and CRM access. Plans include Standard (free), Office ($39/month for 10 users), and Corporation ($79/month for 20 users) tiers. Additional per-user pricing for more users.
- Virtual Phone Numbers: Monthly fees for virtual numbers in 110 countries. Landline numbers from $2/month, mobile numbers from $3/month, toll-free numbers vary by country. Connection fees apply.
- SIP Trunking Services: SIP trunk connections with per-channel pricing. Enterprise plans include Office and Corporation bundles with unlimited call packages and virtual numbers included.
- HLR Lookup Service: Pay-per-query database lookup service. Standard rate $0.007 per number check, with automatic discounts for large clients bringing cost to $0.005 per request.
- Outbound Call Rates: Per-second billing for outgoing calls outside plan inclusions. Competitive international rates with savings up to 90% compared to traditional telephony.
- Freemium Model: Free Cloud PBX with basic features for all users. Free incoming calls to virtual numbers (except toll-free). Free CRM integration. Premium features unlocked with paid plans.
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Standard Plan - Free basic tier |
| Subscription | Monthly | Office Plan - $39/month for 10 users |
| Subscription | Monthly | Corporation Plan - $79/month for 20 users |
| Subscription | Monthly | Virtual Phone Numbers - from $2/month |
| Usage-based | Pay-as-you-go | HLR Lookup - $0.007 per query |
| Subscription | Monthly | SIP Trunk Office/Corporation bundles |
Go-to-market motion2 records
Distribution channels7 records
Marketing channels17 records
Zadarma product offering
Product offeringCore offering
Zadarma provides a cloud-based VoIP communications platform offering a free Cloud PBX business phone system, virtual phone numbers in 110+ countries, SIP trunking, and an integrated Teamsale CRM. The platform is supplemented by AI-powered capabilities including a multilingual AI Voice Agent built on ChatGPT and AI Speech Analytics, enabling SMBs and enterprises to set up professional global phone systems in 5 minutes without hardware investments.
Product overview
Zadarma is a cloud communications platform offering a unified VoIP ecosystem with the free Cloud PBX as the core product, supplemented by integrated add-on modules. The platform provides virtual phone numbers in 110+ countries, SIP trunking, native calling apps, and value-added services including AI Voice Agent (multilingual AI customer service), AI Speech Analytics, Teamsale CRM, SMS, Click-to-Call widgets, Call Tracking, and HLR Lookup. The architecture combines the central Cloud PBX platform with modular add-ons that share data and workflows - for example, AI Voice Agent and AI Speech Analytics both leverage the PBX infrastructure and integrate with Teamsale CRM. The product portfolio spans from core telephony (SIP trunk, virtual numbers) to advanced AI capabilities (autonomous agents, speech analytics) to business tools (CRM, call tracking, SMS).
Differentiator
Problem solved
Functional benefit
Brands
- Teamsale CRM: A multifunctional customer relationship management system integrated with cloud PBX, allowing users to make and receive calls from browser, create customer profiles, manage deals and tasks, and track team performance.
- AI Voice Agent
- Zadarma SIP trunk
Products and services
- Cloud PBX (Business Phone System) Free virtual office phone system enabling businesses to set up a professional phone setup in 5 minutes, with IVR, call transfer/pickup/forwarding, call recording, statistics, speech recognition analytics, and voicemail.
- Virtual Phone Numbers Multi-channel virtual phone numbers in 110+ countries including landline, mobile, and toll-free numbers with SMS capabilities, enabling businesses to establish local presence globally without physical equipment.
- SIP Trunk VoIP interconnection service connecting business PBX systems to the PSTN via SIP protocol over the internet, with TLS and SRTP encryption, IP authorization, and direct routing for Microsoft Teams.
- AI Voice Agent Multilingual AI virtual operator that handles customer calls 24/7 with natural human-like voice interaction, answers questions from knowledge bases, and transfers calls to human agents. Built on ChatGPT technology.
- Teamsale CRM Integrated customer relationship management system with cloud PBX that enables call logging from browser, customer profile management, deal tracking, task management, and sales pipeline visualization.
- AI Speech Analytics Speech recognition and analytics service processing call recordings for classification, detection, and reporting. Integrates with VoiceBase and Google Cloud Platform for transcription and analysis.
- Zadarma Calling Apps Native applications for iOS, Android, Windows, and macOS enabling VoIP calls from mobile devices and computers, also available via Chrome browser extension and WebRTC.
- SMS Text messaging service supporting sending and receiving SMS through virtual numbers, with integration to email, messengers (Facebook, Telegram, Slack), and CRM systems.
- Click to Call Website callback and click-to-call widget solution boosting website conversion by enabling visitors to request instant callbacks via embeddable code.
- Call Tracking Marketing attribution service tracking call sources, visitor interactions, and lead quality by integrating with Google Analytics to measure marketing channel performance.
- HLR Lookup (Database Actualization) Phone number verification service checking if numbers are active, determining carrier information, identifying roaming status, and reducing costs on calls to inactive numbers. Available via API or web interface.
- eSIM for Internet eSIM data service providing internet connectivity for devices, complementing the communication platform with data access capabilities.
- Number Porting (MNP) Mobile number portability service allowing users to transfer existing phone numbers to Zadarma, available in 40 countries with free porting for eligible users.
Quantifiable outcome
- 90% savings on phone system costs compared to traditional telephony
- +2 more outcomes
Companies that use Zadarma
Customer profileSegments4 records
Ideal customer profiles5 records
Zadarma technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- Yes
- API docs
- API detail
Core technology
AI maturity
App detail
Integration18 records
AI capability9 records
Feature6 records
Zadarma partnerships and signals
Strategic signalPartnerships
14 partnerships are on record, tiered core, strategic and minor.
- OpenAIcoreAI technology partnership for Zadarma's AI Voice Agent. Built on ChatGPT technology for natural language processing and voice interactions. Enables multilingual customer call handling with accurate responses from knowledge bases.
- Google Cloud PlatformcoreSpeech recognition and analytics, Text to Speech services. Used for AI Voice Agent speech processing capabilities.
- ElevenLabs AIcoreSpeech recognition and analytics for AI Voice Agent. Provides voice synthesis and recognition capabilities.
- Gemini (Google)strategicPlanned AI feature integration. Gemini support expected to be added to AI Voice Agent in near future.
- Amazon AWScoreText to Speech services supporting AI Voice Agent capabilities.
- VoiceBasecoreSpeech recognition and analytics for Cloud PBX and call tracking services.
- SalesforcecoreCRM integration with Zadarma Cloud PBX. Free integration allowing call logging, built-in dialer, and interaction tracking within Salesforce.
- HubSpotcoreCRM integration with Zadarma Cloud PBX. Free integration for call logging and customer interaction tracking.
- Zoho CRMcoreCRM integration with Zadarma Cloud PBX. Free integration enabling call logging and customer management.
- Microsoft TeamscoreDirect routing for Microsoft Teams. SIP trunk connects to Teams allowing users to make/receive calls without leaving Teams application.
- ZendeskcoreCRM and support integration with Zadarma Cloud PBX for customer service workflow automation.
- FreshdeskcoreHelp desk and CRM integration with Zadarma Cloud PBX for customer support workflow.
- MS Dynamics 365coreEnterprise CRM integration with Zadarma Cloud PBX for Microsoft ecosystem users.
- JumiominorIdentity verification service for user identification. Processes biometric data for KYC compliance when users connect phone numbers.
Scale indicators8 records
Recent moves5 records
Expansion highlights5 records
Zadarma competitors and assessment
Company assessmentBroad incumbents
- Vonage (Ericsson): Now part of Ericsson, Vonage provides UCaaS, CCaaS, and communications APIs to SMB through enterprise. Comparable to Zadarma on cloud PBX, SIP trunking, virtual numbers, and API-first platform approach.
- RingCentral: Public UCaaS/CCaaS leader offering cloud PBX, voice, messaging, and contact center solutions to SMB and enterprise. Closely comparable to Zadarma on cloud PBX and SIP trunking, but RingCentral operates at significantly larger scale with deeper enterprise penetration.
- 8x8: Public UCaaS and CCaaS provider serving SMB through enterprise. Comparable on cloud PBX, SIP trunking, virtual numbers, and AI-driven analytics, with broader contact-center capabilities than Zadarma.
- Twilio: Public communications platform-as-a-service leader providing voice, SMS, SIP trunking, and APIs at global scale. Comparable to Zadarma on API-first developer offering, virtual numbers, and SIP trunking, with substantially larger enterprise footprint.
Direct peers
- Ooma: Public VoIP provider focused on SMBs and consumers with cloud PBX, virtual numbers, and SIP trunking. Closely comparable to Zadarma in target market (SMBs), freemium-style product strategy, and breadth of telephony services including virtual numbers.
- 3CX: Cloud PBX and unified communications provider offering free and paid tiers for SMBs globally. Directly comparable to Zadarma on the free cloud PBX positioning, SMB focus, and international multi-channel distribution.
- Nextiva: UCaaS provider focused on SMBs offering cloud PBX, SIP trunking, and CRM integrations. Comparable to Zadarma on SMB-first positioning, freemium-style adoption, and integrated CRM-style workflows.
- Dialpad: AI-native communications platform offering UCaaS and CCaaS with proprietary AI Voice Agents and speech analytics. Comparable to Zadarma on AI Voice Agent positioning and SMB-to-midmarket segment focus.
- Telnyx: Cloud communications platform offering SIP trunking, virtual numbers, voice APIs, and AI voice services globally. Directly comparable to Zadarma on global virtual numbers, API-first developer offering, SIP trunking, and AI Voice Agent capabilities.
- Plivo: Cloud communications platform offering voice, SMS, SIP trunking, and virtual numbers via API with global coverage. Directly comparable to Zadarma on API-first developer positioning, virtual number footprint, and SMB/developer target market.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat6 records
Key risks6 records
Key highlights7 records
Customer concentration
Zadarma social profiles
Digital presenceZadarma compliance and trust
Trust signalCompliance2 records
Zadarma financial estimates
Financial estimateRevenue estimate
Valuation estimate
Zadarma leadership team
Management profileNumber of profiles
Profiles3 records
Zadarma subsidiaries and ownership
Company hierarchySubsidiaries3 records
Zadarma funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Zadarma M&A and investment
M&A and investmentM&A2 records
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Zadarma
What does Zadarma do?
Zadarma provides a cloud-based VoIP communications platform offering a free Cloud PBX business phone system, virtual phone numbers in 110+ countries, SIP trunking, and an integrated Teamsale CRM. The platform is supplemented by AI-powered capabilities including a multilingual AI Voice Agent built on ChatGPT and AI Speech Analytics, enabling SMBs and enterprises to set up professional global phone systems in 5 minutes without hardware investments.
Is Zadarma a public or private company?
Zadarma is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was Zadarma founded?
Zadarma was founded in 2006. It employs 101 to 250 people.
Where is Zadarma based?
Zadarma is headquartered in Burgas, Bulgaria, in the Europe region.
How does Zadarma make money?
Six revenue lines are on record. Subscription - PBX Plans are the primary driver. The others are virtual Phone Numbers, SIP Trunking Services, HLR Lookup Service, outbound Call Rates and freemium Model.
Who are Zadarma's main competitors?
Broad incumbents on record are Vonage (Ericsson), RingCentral, 8x8 and Twilio. Direct peers are Ooma, 3CX, Nextiva, Dialpad, Telnyx and Plivo.
Does Zadarma have an API?
Yes. Zadarma offers a free API and Webhook interface for all users, enabling custom integrations, real-time event notifications, and connection to internal telephony systems. API is available for services including HLR lookup (number verification), virtual phone numbers management, call routing configuration, and real-time call data. Webhooks support receiving call events, recording status, and SMS delivery notifications. Developer documentation is at zadarma.com/en/support/api.
What industry is Zadarma in?
Zadarma's product category is Cloud Communications / VoIP Services. Its primary akta.pro industry code is HDAIAHAB, Cloud PBX & Hosted Telephony, with a secondary code of HDAAAFAC, Conversational AI Platforms (chat/voice bots, orchestration). Its NAICS code is 5171 and its SIC code is 7385.