What DSL.cz does

DSL.cz is a Czech Republic-based telecommunications comparison and service-availability platform, founded in 1990 and operating from Beroun with 11-50 employees. Originally launched as adsl.cz, the platform serves Czech consumers seeking to verify internet and television service availability at a specific address or landline number, compare offerings from major domestic ISPs, and measure their connection speed. Core products include an address-based availability verification tool, an ISP catalog covering fixed, mobile, and TV services, a web and mobile-app internet speed test, a crowdsourced mobile internet speed map, and a help/cost-optimization center.

The underlying technology is a web-based service availability verification platform with integrated speed measurement and a content publication layer. Mobile speed test data collected via the Android and iOS apps is aggregated into a public interactive speed map. The platform also operates an SEO-driven content site publishing Czech-language articles on telecom topics including AI, 5G, roaming, and operator promotions. A previously used sub-domain architecture (o2.adsl.cz, t-mobile.adsl.cz) and current advertising/affiliate integrations suggest a partner-facing infrastructure supporting both consumer comparisons and lead generation.

DSL.cz generates revenue primarily through affiliate referral partnerships with the three largest Czech ISPs — O2 Czech Republic, T-Mobile Czech Republic, and Vodafone Czech Republic — plus dedicated advertising sales. The company does not publish its own pricing; instead, it surfaces promotional tariffs from partner ISPs and captures referral economics when consumers order services through the platform. Marketing channels center on organic SEO, content marketing, and operator-assisted callback requests. End customers are Czech households and individuals comparing fixed broadband, mobile internet (including 5G/LTE), and television bundles, with revenue concentration risk on the upstream ISP partnership side rather than the consumer side.

Name

DSL.cz

Legal name

DSL.cz

Website

https://dsl.cz

Company type

Private

Founded year

1990

Operating status

Operating

Headcount range

11–50 employees

Short description

DSL.cz is a Czech Republic-based internet and TV comparison platform that verifies service availability by address, aggregates offerings from major Czech ISPs (O2, T-Mobile, Vodafone), and runs web and mobile speed-testing tools, monetizing via affiliate referrals and advertising.

Ownership category

akta.pro rank

Product category

Telecommunications comparison and ISP lead generation

NAICS

Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services (5182)

SIC

Services-Computer Programming, Data Processing, Etc. (7370)

akta.pro primary industry

Lead Generation, Comparison & Marketplace Platforms (Financial Products) (FSAEAMAM)

akta.pro secondary industry

DSL Broadband Providers (xDSL) (HDAIABAD)

Keywords

• Internet service comparison
• ISP comparison platform
• Service availability verification
• Internet speed testing
• Telecom tariff catalog

Headquarters

HQ city

Beroun

HQ country

Czechia

HQ region

Europe

Offices1 record

Markets served

GTM type

B2C

Offering type

Digital Commerce or Content

Cost components

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

Revenue model

1. Referral/Affiliate Revenue: DSL.cz generates revenue through referral partnerships with major Czech ISPs (O2, T-Mobile, Vodafone) when customers order services through the platform. The site features promotional tariffs from these providers.
2. Advertising: The platform sells advertising space to partners and service providers, as evidenced by the dedicated Reklama (Advertising) page.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

DSL.cz runs a Czech-language ISP comparison and lead-generation portal that lets consumers check internet and TV availability at a specific address or landline, compare fixed broadband, mobile internet, and TV tariffs from O2, T-Mobile, and Vodafone, and run web and mobile speed tests. The platform collects crowdsourced mobile speed-test data into an interactive map and monetizes via affiliate referrals and advertising rather than selling its own connectivity.

Product overview

DSL.cz is a Czech internet service aggregator and comparison platform operating as a single unified portal. The core offering consists of an ISP catalog (Katalog) aggregating fixed internet, mobile internet, and television services from providers such as O2, T-Mobile, and Vodafone; an internet speed testing service (Měření rychlosti) available via web and mobile apps for Android and iOS; a crowdsourced mobile internet speed map; and an address-based service availability checker. Additional self-service features include help guides, cost optimization tools, FAQ, and a glossary. The platform generates revenue through affiliate partnerships with ISPs and advertising.

Differentiator

Problem solved

Functional benefit

Products and services

• Ověření dostupnosti služeb (Service Availability Check) Free self-service tool that lets Czech consumers verify internet and television availability at a specific street address or landline phone number, with operator-assisted callback escalation when automated checking fails.
• Katalog internetu a televize (Service Catalog) Comparison catalog of fixed broadband, mobile internet, and television services from major Czech ISPs including O2, T-Mobile, Vodafone, and Telly, including promotional tariffs and pricing details.
• Měření rychlosti internetu (Internet Speed Test) Online internet speed measurement tool that lets users benchmark their connection and compare results with others in their area.
• Mobilní aplikace DSL.cz (Mobile Speed Test App) Mobile application for Android (Google Play) and iOS (App Store) that enables users to measure internet speed on their smartphones and contributes data to the mobile internet speed map.
• Mapa rychlosti mobilního internetu (Mobile Internet Speed Map) Interactive map visualization of mobile internet speeds in the Czech Republic based on crowdsourced measurements collected from the DSL.cz mobile application.
• Optimalizace nákladů (Cost Optimization) Free service offering recommendations to help Czech consumers reduce their internet and telecom costs, available through the DSL.cz help center.

Segments3 records

Ideal customer profiles1 record

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• O2 Czech RepubliccoreChannel Partner/ Reseller/ DistributorO2 Czech Republic is a key partner, with DSL.cz featuring O2 tariff promotions and dedicated O2-related pages (o2.adsl.cz). O2 tariffs including 5G/4G Internet MAX are prominently featured in the catalog with promotional pricing.
• T-Mobile Czech RepubliccoreChannel Partner/ Reseller/ DistributorT-Mobile is a key partner with multiple tariff offerings featured on DSL.cz including Internet bez drátu (wireless internet) plans at various price points and data limits. DSL.cz provides operator contact lines for T-Mobile sales assistance.
• Vodafone Czech RepubliccoreChannel Partner/ Reseller/ DistributorVodafone is featured as a partner with offerings including Připojení bez kabelu (wireless connection) plans. The platform features promotional tariffs and provides dedicated contact lines for Vodafone customer acquisition.
• TellyminorChannel Partner/ Reseller/ DistributorTelly TV is featured in the promotional offers section with pricing at 270 Kč/month for television services.

Scale indicators1 record

Recent moves6 records

Expansion highlights5 records

Direct peers

• Cable.co.uk: UK broadband comparison and information site offering provider comparison, address-level availability, and speed data with affiliate referrals to ISPs. Very comparable to DSL.cz in product scope (availability + comparison + speed info) operating in the UK market.
• BroadbandNow: US-focused broadband and ISP comparison platform offering address-level availability lookup across providers and speed information. Nearly identical product scope to DSL.cz (availability + comparison) operating in the US broadband market.
• Zboží.cz: Czech product search and price comparison platform operated by Seznam.cz, the leading Czech portal. Operates the same Czech SEO-driven comparison and affiliate-style monetization model as DSL.cz, though focused on retail rather than telecom services.
• Check24: Germany's leading multi-category comparison and marketplace platform covering broadband/DSL, mobile, insurance, energy, banking, and travel. Operates the same affiliate-monetized comparison-and-referral model that DSL.cz runs in Czech Republic, just across many more verticals and a much larger market.
• Verivox: German price-comparison platform for energy, telecom/broadband, and insurance tariffs. Closely mirrors DSL.cz's ISP comparison and referral economics in the German market, with the same susceptibility to partner concentration risk.
• uSwitch: UK service comparison platform enabling consumers to compare broadband, mobile, TV, energy, and insurance via affiliate referrals. Closely comparable to DSL.cz in the broadband-comparison vertical with the same lead-gen monetization flow.
• Heureka: Largest Czech price-comparison marketplace, aggregating thousands of e-commerce SKUs from Czech and Slovak merchants. Same host country, same affiliate-driven revenue model, and similar SEO-led acquisition playbook as DSL.cz — operating in retail rather than telecom.
• TopTarif: Czech GSM tariff comparison site, explicitly cross-referenced as a partner link ('Nejlevnější GSM tarify') from DSL.cz's own footer. Mirrors DSL.cz's mobile-comparison segment and operates the same affiliate-driven lead-gen model on the Czech market.
• Internet.cz: Czech speed-test and broadband measurement tool operated by CZ.NIC, the Czech domain registry. Directly overlaps DSL.cz's speed-test and connectivity-quality features and serves the same Czech end-user base, though without the comparison-and-referral monetization layer.

Broad incumbents

• MoneySupermarket: Large UK multi-category comparison marketplace covering broadband, mobile, energy, insurance, and banking with the same affiliate revenue model. Wider portfolio than DSL.cz but the same core lead-gen / commission monetization playbook.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/DSLcz
• Facebookfacebook.com/DSLcz
• LinkedInlinkedin.com/company/dsl-cz

Revenue estimate

Valuation estimate

Number of profiles

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 DSL.cz