What Zoiper does

Zoiper, operated by Bulgarian private limited company Securax EOOD and founded in 2003 in Sofia, is a service-independent VoIP SIP softphone vendor with a 22-year operating history. Its product portfolio spans native desktop clients (Windows, macOS, Linux) and mobile apps (Android, iOS), built on a proprietary C/C++/Assembly codebase engineered for low memory and CPU footprint, plus an SDK (Zoiper SDK 2.0) and a Windows COM API (Zoiper Biz) for embedding voice, video, instant messaging, and presence into third-party applications. The company has accumulated broad SIP interoperability with major PBX platforms (Asterisk, FreeSWITCH, Cisco CallManager, 3CX, elastix) and supports end-to-end encryption (TLS, SRTP, ZRTP), HD audio/video with up to 6-participant conferencing, CRM and contact integration, and zero-touch QR-code provisioning for mass deployment.

Zoiper monetizes through a hybrid model: a one-time $59.95 perpetual desktop license, mobile subscriptions (€7.99/month Android, $4.99 iOS), enterprise volume pricing, and custom white-label/OEM contracts with ITSPs and mobile operators. A freemium tier underpins a 10M+ organic user base, with tens of millions more reached indirectly through white-label OEM partners. The most recent strategic emphasis has been on product renewal (Zoiper 5 in 2024) and AI-enabled call transcription and analytics through a partnership with Banafo, alongside expansion of reseller and white-label channels to address call-center and operator customers.

The company is privately held and self-funded, with no disclosed venture capital, institutional investors, M&A, or leadership changes, and is led by founder/CEO/CTO Joachim Vanheuverzwijn. Operations are concentrated in Sofia, Bulgaria, with sales offices referenced in Luxembourg (+352) and the United States (+1 415), serving a global customer base across Europe and North America.

Name

Zoiper

Legal name

Securax EOOD

Website

https://zoiper.com

Company type

Private

Founded year

2003

Operating status

Operating

Headcount range

51–100 employees

Short description

Zoiper is a privately held Bulgarian VoIP SIP softphone vendor offering cross-platform desktop, mobile, SDK, and white-label OEM communications products to ITSPs, mobile operators, call centers, enterprises, and individual users since 2003.

Ownership category

akta.pro rank

Product category

VoIP Softphone Software

NAICS

All Other Telecommunications (517810), Custom Computer Programming Services (541511)

SIC

Services-Telephone Interconnect Systems (7385), Telephone Communications (No Radiotelephone) (4813)

akta.pro primary industry

Voice Calling (VoIP) Apps (BPAMACAC)

akta.pro secondary industries

VoIP Access & ITSP Services (HDAIAHAD), Unified Communications & Collaboration Network Services (VoIP/QoS) (BPAEAEAI)

Keywords

• VoIP softphone software
• SIP telephony client
• VoIP development SDK
• White label softphone
• Video conferencing app

Headquarters

HQ city

Sofia

HQ country

Bulgaria

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Software

Cost components

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

Revenue model

1. Desktop Software Licenses: One-time perpetual license purchase for Zoiper 5 PRO desktop (Windows, Mac, Linux) at $59.95 per license. No monthly or yearly subscription fees.
2. Mobile Subscriptions: Monthly subscription model for mobile premium features: Android at €7.99/month, iOS at $4.99. Volume pricing for Android enterprise deployments at €2.49/user/month billed annually for 10+ users.
3. Freemium Model: Free basic versions of Zoiper available for desktop and mobile platforms, with premium paid upgrades for advanced features like auto provisioning, better codecs, and business functionality.
4. White Label/OEM Licensing: Custom branded softphone solutions sold to ITSPs, mobile operators, and call centers with custom feature sets, branding, and flexible licensing models (per user to unlimited installations).
5. SDK Licensing: VoIP SDK sold to developers for embedding voice, video, messaging, and presence capabilities into third-party applications. Flexible licensing options available, per user or unlimited.
6. Volume Enterprise Licensing: Volume pricing for enterprise deployments over 99 users, with pricing negotiated via sales contact.

Pricing tiers

Go-to-market motion4 records

Distribution channels6 records

Marketing channels6 records

Core offering

Zoiper builds and sells a service-independent VoIP SIP softphone called Zoiper 5 for Windows, macOS, and Linux, complemented by native Zoiper apps for Android and iOS. The product supports voice calls, HD video conferencing with up to 6 participants, instant messaging, presence, contact integration, click-to-dial, and military-grade TLS/SRTP/ZRTP encryption. Alongside the consumer softphones, Zoiper sells a Zoiper SDK 2.0 for embedding VoIP into third-party apps, a Zoiper Biz API for Windows-based CRM/ERP integrations, and white-label/OEM softphone solutions for ITSPs and mobile operators.

Product overview

Zoiper offers a portfolio of VoIP SIP softphone products spanning desktop (Windows, macOS, Linux), mobile (Android, iOS), and SDK/embedded solutions. The core offering is Zoiper 5 (desktop) and native apps for Android and iOS, all supporting voice, video, instant messaging, and presence. The product line includes the Zoiper SDK 2.0 for developers embedding VoIP capabilities into custom applications, Zoiper Biz API for Windows-based CRM/ERP integration, and Whitelabel/OEM solutions for service providers requiring branded softphones. The portfolio is available in Free, Premium/Pro (paid one-time or subscription), and Custom/Enterprise tiers. A notable addition is AI-powered transcription and analytics via Banafo integration.

Differentiator

Problem solved

Functional benefit

Brands

• Zoiper 5: Latest version of Zoiper softphone for Windows, macOS and Linux with AI feature integration
• Zoiper Biz
• Zoiper SDK 2.0
• Zoiper AI Features
• Whitelabel / OEM Solutions

Products and services

• Zoiper 5 Flagship VoIP SIP softphone for Windows, macOS, and Linux supporting voice, HD video (up to 6 participants), instant messaging, presence, contact integration, click-to-dial, and military-grade encryption (TLS/SRTP/ZRTP). Available in Free, Premium ($59.95 one-time), and Custom tiers.
• Zoiper for Android VoIP softphone for Android with redesigned UI, improved battery saving, HD audio/video, call transfer, conference, instant messaging, and presence. Premium tier at €7.99/month (or €2.49/user/month annually for 10+ users).
• Zoiper for iOS VoIP softphone for iOS built with the native iOS SDK, optimized for low battery usage, featuring audio/video calls, transfer, conference, and instant messaging. Premium tier at $4.99.
• Zoiper SDK 2.0 Software Development Kit providing a complete SIP tools package with core VoIP libraries for embedding voice, video, instant messaging, and presence into mobile and desktop applications. Built in C++ with wrappers for Java, Kotlin, Swift, Objective-C, C#, and .NET. Available for Android, iOS, Windows, Mac, and Linux.
• Zoiper Biz API High-level COM API for Windows enabling control of the Zoiper softphone from external applications. Supports CRM/ERP/contact management integration, call event scripting, UI customization, and direct provisioning configuration. One standard business license per user.
• Zoiper Whitelabel/OEM Softphone Custom-branded OEM softphone solutions for ITSPs, operators, call centers, and PBX providers. Includes custom logo, colors, fonts, icons, IMS/RCS support, VoLTE readiness, zero-touch QR provisioning, and flexible licensing models from per-user to unlimited installations.
• Zoiper for Call Centers Specialized softphone configuration for call/contact center environments featuring click-to-dial, URL/application opening on phone events, call recording, auto-answer, call blending, custom ringtones, HID headset support, and call center software integration.
• Zoiper AI Features (Banafo Integration) AI-powered speech-to-text and analytics features for Zoiper 5, integrated via partnership with Banafo. Provides call recording transcription, automated summaries, titles, call classification, and entity extraction, with results delivered via email. Supports English, Dutch, French, Bulgarian, Hebrew, Portuguese, Spanish, German, and Italian, with on-premise ML models available.

Quantifiable outcome

• Low memory and CPU usage enabling quality audio on older hardware

Named customers1 record

Segments4 records

Ideal customer profiles5 records

Technology focussed Yes

API detail

Has API

Yes

API docs

API detail

Core technology

AI maturity

App detail

Integration22 records

AI capability4 records

Feature10 records

Partnerships

Two partnerships are on record, tiered core.

• BanafocoreTechnology or IntegrationBanafo provides AI-powered speech-to-text integration for Zoiper 5, enabling automatic call transcription, summaries, titles, call classification, and entity extraction. Zoiper integrates Banafo directly into its softphone interface. Banafo offers both cloud and on-premise machine learning models trained for speech-to-text.
• VoIP Service Providers (Asterisk, FreeSWITCH, Cisco, 3CX, elastix)coreTechnology or IntegrationZoiper is service-agnostic and compatible with most VoIP service providers and PBX systems. Explicitly supports Asterisk, FreeSWITCH, Cisco CallManager, 3CX, elastix, and most modern SIP-based PBXs. Works with hosted PBX providers.

Scale indicators3 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• Express Talk (NCH Software): Express Talk is a SIP softphone for Windows from NCH Software supporting voice, video, and conferencing. Comparable as a desktop-first SIP softphone, with similar freemium and paid licensing patterns.
• MicroSIP: MicroSIP is a free, open-source SIP softphone for Windows. Competes with Zoiper's desktop free tier in the same lightweight SIP client category, particularly among individual users and small ITSPs.
• MizuTech (MizuDroid / MizuPhone): MizuTech offers MizuDroid, MizuPhone, and a SIP softphone SDK targeting ITSPs and developers. Direct peer across consumer softphone and developer SDK channels with similar licensing models.
• 3CX: 3CX is a software PBX that ships its own branded softphone clients for desktop and mobile. Direct overlap on softphone product surface, though 3CX is primarily a PBX vendor and Zoiper is a SIP-agnostic client compatible with 3CX systems.
• Acrobits (Groundwire): Acrobits offers Groundwire, a SIP softphone for iOS and Android with push, white-label, and SDK offerings. Directly comparable to Zoiper in product scope (consumer softphone, OEM/whitelabel, and developer SDK), serving overlapping ITSP and enterprise segments.
• CounterPath / Bria (now part of Ribbon Communications): Bria softphone (formerly CounterPath) is a longstanding SIP softphone with desktop, mobile, and SDK offerings targeting ITSPs and enterprises. Highly comparable to Zoiper across consumer, white-label, and embedded SDK channels.
• Linphone (Belledonne Communications): Linphone is an open-source SIP softphone for desktop and mobile with an SDK for embedding VoIP into applications. Direct competitor on cross-platform softphone and SIP SDK dimensions, frequently cited alongside Zoiper by ITSPs.
• Grandstream Wave: Grandstream Wave is a free SIP softphone for Android and iOS bundled with Grandstream's SIP infrastructure portfolio. Comparable as a free/consumer SIP softphone targeting ITSPs and SMBs, with overlapping distribution through service providers.

Broad incumbents

• Telnyx: Telnyx is a cloud communications platform offering SIP trunking, voice APIs, and its own Mission Control softphone. Comparable as a broader telecom/communications provider with overlapping ITSP customer base, though Telnyx is a full-stack carrier rather than a softphone specialist.
• Microsoft Teams: Microsoft Teams bundles voice, video, IM, and presence with deep Office 365 integration. Represents the broad UCaaS competitive backdrop against which standalone SIP softphones like Zoiper are positioned.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/Zoiper
• Facebookfacebook.com/Zoiper

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 Zoiper