What LEO.org does

LEO.org (LEO GmbH) is a German online language-reference service headquartered in Sauerlach, Germany, founded in 1995 by Achim Jung as a project at the Technical University of Munich and incorporated as LEO GmbH in 2006. The company operates a free bilingual dictionary platform covering 12 language pairs (German paired with English, French, Spanish, Italian, Portuguese, Russian, Polish, Chinese, Japanese, Dutch, Swedish, and Esperanto), underpinned by a proprietary in-house search engine called "dictQuery" and a content corpus of more than 400,000 entries maintained in part through community contributions. The company serves a long-tail consumer base of students, translators, and language learners, with cumulative app downloads exceeding 2 million by 2011 and peak platform usage of more than 10 million dictionary queries per day reported in 2007.

LEO's business model combines free ad-supported access with three paid monetization layers: (i) display and banner advertising on the website and in apps, (ii) a subscription product called LEO Pur priced at €2.99 per month or €29.88 per year that removes advertising and unlocks premium vocabulary-learning features, and (iii) a school-licensing program ("LEO Pur in der Schule") launched in June 2024 at €150 per year per institution that provides schools with full premium access for students and teachers. The company also sells structured online language courses and operates a Vocabulary Trainer that uses machine-assisted spaced-repetition logic. The organization runs with a lean headcount of 11–50 employees and has remained privately held and bootstrapped since inception, with no disclosed external funding rounds.

The company's recent strategic emphasis has shifted from pure dictionary utility toward monetizable learning and B2B/education channels. Key moves in 2024 included the January launch of LEO Pur as a freemium subscription, the June launch of the school-licensing SKU, and a full redesign of the Android and iOS mobile apps in July 2024. In July 2025 LEO entered a content partnership with Westermann Gruppe to provide vocabulary collections for the Camden Town textbook series, signaling deeper penetration into the German institutional education market.

Name

LEO.org

Legal name

LEO GmbH

Website

https://leo.org

Company type

Private

Founded year

1995

Operating status

Operating

Headcount range

11–50 employees

Short description

LEO.org is a German operator of a free bilingual online dictionary platform covering 12 language pairs, monetized via advertising, a freemium subscription (LEO Pur), and school licensing, serving language learners, students, and translators across DACH and beyond.

Ownership category

akta.pro rank

Product category

Online Dictionary and Language Learning

NAICS

Language Schools (611630), Educational Support Services (611710), Web Search Portals and All Other Information Services (519290)

SIC

Services-Educational Services (8200), Services-Computer Integrated Systems Design (7373)

akta.pro primary industry

Language Learning Apps & Self-Study Platforms (EDAFAOAA)

akta.pro secondary industries

Classroom & Institutional Language Learning Platforms (Schools/Universities) (EDAFAOAI), Assessment & Quiz Item Authoring Tools (within course builders) (EDAFAHAG), Q&A and Knowledge Discovery Platforms (BPAMAAAF)

Keywords

• Bilingual dictionary services
• Online language learning
• Vocabulary training platform
• Multilingual reference tools
• Language course platform

Headquarters

HQ city

Sauerlach

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2C

Offering type

Software

Cost components

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

Revenue model

1. Advertising: Primary revenue source. Banner advertising on desktop (Large Billboard 970x250px, Billboard 800x250px, Leaderboard 728x90px) and mobile devices. Advertising partner diva-e handles banner rotation campaigns. Geo-targeting available.
2. LEO Pur Subscription: Premium ad-free subscription at €2.99/month or €29.88/year. Includes faster load times and distraction-free experience. Available for web only; app subscriptions managed separately by app stores.
3. School Licensing: Special 'LEO Pur in der Schule' program for educational institutions at €150/year, providing ad-free and tracking-free access for entire schools.
4. Language Courses: Paid language courses available as add-on purchases. Some free trial lessons available. Course access valid for one year.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels6 records

Core offering

LEO.org operates an online dictionary and language learning platform providing free bilingual dictionaries across 12 language pairs, supplemented by community forums, an AI-powered vocabulary trainer, and structured language courses accessible via web and mobile applications. The platform also offers a premium subscription tier (LEO Pur) with extended features and provides institutional licensing to schools.

Product overview

LEO.org is a comprehensive online language learning platform built around a free bilingual dictionary service. The core product is the LEO Dictionary offering 12 language pairs with pronunciation audio, flexions tables, and supplementary information. The platform includes community-powered LEO Forums for translation discussions, an AI-enhanced LEO Vocabulary Trainer with spaced repetition for personalized learning, Language Courses for structured instruction, and reference works including LEO's English Grammar and Guide to Idiomatic French. Mobile access is provided through native Android/iOS apps and a web-based PDA version, while premium access comes via LEO Pur (ad-free subscription). Additional offerings include an annual Advent Calendar, the Lion desktop application for text translation, and entertainment features like the LEO Cocktail Bar.

Differentiator

Problem solved

Functional benefit

Products and services

• LEO Dictionary Free online bilingual dictionary providing translation lookups across 12 language pairs, powered by the proprietary dictQuery search engine with morphology support. Available to individual users via web and mobile applications.
• LEO Vocabulary Trainer Vocabulary training application that uses AI-powered exercises to help learners build and retain vocabulary across the supported language pairs. Targeted at self-directed learners using the LEO platform.
• LEO Forums Community forums where users ask and answer language questions, contributing user-generated content and explanations beyond the core dictionary entries.
• LEO Language Courses Structured paid language courses delivered online as part of the LEO platform, extending the dictionary and vocabulary trainer into guided learning paths.
• LEO Pur Subscription Premium subscription tier (LEO Pur) that provides enhanced features such as offline access and ad-free usage for individual subscribers on top of the free LEO.org offering.
• LEO Mobile Applications Native mobile applications for iOS and Android that deliver the LEO dictionary, vocabulary trainer, and core learning features on smartphones and tablets.
• School and Institutional Licensing Site licensing of the LEO dictionary and vocabulary trainer for schools, universities, and language teaching institutions, providing classroom-integrated access for students and educators.

Quantifiable outcome

• Up to 10+ million queries per day at peak (German-English dictionary, October 2007)
• +2 more outcomes

Named customers2 records

Segments3 records

Ideal customer profiles2 records

Technology focussed Yes

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

AI capability2 records

Feature4 records

Partnerships

Seven partnerships are on record, tiered core and minor.

• Westermann GruppecoreStrategic or Co-development Partner · 22 July 2025Partnership to provide vocabulary collections aligned with Westermann's Camden Town textbook series. LEO's vocabulary trainer integrates vocabulary from these textbooks, enabling students to practice school materials. LEO's AI suggests optimal review schedules for vocabulary retention.
• MAG InteractiveminorGTM or Marketing Partner · 8 September 2023Co-created special quiz on loanwords (Lehnwörter) with MAG Interactive's Quizduell app. Quiz available September 9-22, 2023 as a back-to-school promotion. LEO provided language expertise for quiz content.
• diva-ecoreChannel Partner/ Reseller/ DistributorPartner for banner rotation advertising campaigns. Handles booking and technical requirements for rotating banner ads on LEO.org. Geo-targeting and audience segmentation available through this partner.
• IP Exchange GmbHcoreTechnology or IntegrationServer hosting provider. LEO operates servers at IP Exchange facilities in Munich and Nuremberg for high availability. Load balancers distribute traffic across locations for reliability.
• Linguatec GmbHcoreTechnology or IntegrationProvides Text-to-Speech pronunciation audio files using Voice Reader technology. Enables audio pronunciation for dictionary entries. French pronunciation launched 2007, English and other languages expanded later.
• Technische Universität MünchenminorStrategic or Co-development PartnerOriginal founding institution. LEO was started in 1995 on a computer at TU Munich's Department of Computer Science (Rechnerbetriebsgruppe der Fakultät für Informatik). Carl Zeiss AG also provided the leo.de domain.
• User Contributors (Community)coreOthersThousands of users contribute vocabulary, report errors, and suggest new entries. Notable contributors include F. Vent (English vocabulary), D. Lauk/Landis+Gyr AG (technical vocabulary), Prof. G. Merk (finance glossary), and many others who donated word lists.

Scale indicators7 records

Recent moves6 records

Expansion highlights6 records

Emerging players

• Memrise: Vocabulary-led language-learning platform with spaced repetition and user-generated content; comparable to LEO's vocabulary trainer and community-driven learning experience, especially for casual and hobbyist learners.

Direct peers

• dict.cc: One of LEO's closest direct peers: a community-driven German-headquartered bilingual dictionary platform covering many of the same language pairs, monetized via subscriptions and ads, and competing for the same DACH user base.
• PONS (Pons GmbH): Established German dictionary publisher offering online bilingual dictionaries and translation tools across similar European language pairs, with strong brand recognition in DACH schools and among language learners.
• Langenscheidt: Iconic German dictionary and language-learning brand with online dictionaries and apps across many of the same pairs as LEO, particularly strong in German-centric pairs and institutional/educational channels.
• Reverso: Online translation and dictionary platform with bilingual dictionaries, context examples, and language learning tools across many of the same European language pairs as LEO.
• Linguee: Bilingual dictionary and example-translation search engine; covers similar European pairs and is widely used by translators and learners, directly overlapping with LEO's lookup and reference use cases.

Broad incumbents

• DeepL: German-founded AI translation service offering free and Pro tiers; overlaps with LEO's translation-lookup use case with a more modern, AI-driven UX, posing the primary competitive threat to dictionary-led workflows.
• Duolingo: Leading global language-learning app with gamified lessons, vocabulary, and AI features; competes with LEO's vocabulary trainer and broader self-study audience, especially among younger learners.
• Babbel: Subscription-based language-learning platform with structured courses across many of the same pairs as LEO; overlaps with LEO's language courses and LEO Pur subscription offerings.
• Google Translate: Free, ubiquitous translation service from Google covering all LEO language pairs; represents the dominant free substitute for casual dictionary lookup and is the primary barrier to LEO's premium subscription conversion.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/leo-org

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 LEO.org