Tandem
Tandem is a Berlin-based mobile language exchange platform connecting millions of users globally for peer-to-peer learning via chat, voice, and video. It monetizes through its Tandem Pro subscription add-on layered on a free core app.
- Company typePrivate
- Founded2015
- HeadquartersBerlin, Germany
- Headcount11–50
- GTM typeB2C
- OfferingSoftware
What Tandem does
Tandem is a Berlin-based mobile language exchange platform founded in 2015 that connects native speakers worldwide for peer-to-peer language learning. The app pairs users with conversation partners based on language preferences, location, and interests, enabling language practice through chat messaging, voice notes, audio calls, and video calls supported by built-in correction and translation tools. The platform has scaled to millions of members distributed across major markets including Brazil (122,284), Russia (90,263), France (54,340), Germany (49,347), the United States (43,741), Mexico (42,331), Italy (34,288), Japan (19,365), and the United Kingdom (15,575), with over 500,000 monthly website visitors and more than 100,000 five-star reviews across app stores. Tandem operates dual offices in Berlin and Hannover and is led by co-founder and CEO Arnd Aschentrup, co-founder and CPO Tobias Dickmeis, and CTO Mark Dalby.
The core product is the Tandem Mobile Language Exchange App available on iOS and Android, layered with Tandem Pro, a premium subscription tier that adds unlimited translations, advanced translation corrections, a Travel Mode for finding local partners, and an ad-free experience. Distribution is fully self-serve and product-led: users download the app for free, undergo a community-reviewed application process for safety, and discover partners through search filters by language and geography. Marketing relies on app store optimization, earned media coverage from Mashable, TechCrunch, LifeHacker, Evening Standard, and Business Insider, a Tandem Ambassadors community program, and active social channels including Instagram, TikTok, VK, and YouTube. Tandem Fundazioa, a nonprofit based in the Basque Country, is referenced as a licensing entity though the corporate relationship is not detailed.
Tandem's revenue model is a freemium consumer subscription business, with the free basic membership serving as the acquisition funnel and Tandem Pro converting users to paid monthly subscriptions. The company is privately held and in January 2026 closed a $100 million Series B funding round led by Accel — a significant step up from cumulative prior capital of approximately $8.1 million raised across earlier rounds. No public API, AI/ML modalities, patents, or enterprise offerings are disclosed in the source data.
Tandem firmographics
Firmographics- Name
- Tandem
- Legal name
- Tandem
- Website
- https://tandem.net
- Company type
- Private
- Founded year
- 2015
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- Tandem is a Berlin-based mobile language exchange platform connecting millions of users globally for peer-to-peer learning via chat, voice, and video. It monetizes through its Tandem Pro subscription add-on layered on a free core app.
- Ownership category
- akta.pro rank
Tandem industry classification
Industry- Product category
- Language Learning Platform
- akta.pro primary industry
- Online Tutoring, Conversation Exchange & Language Coaching Platforms (EDAFAOAB)
- akta.pro secondary industry
- Teacher-Led Conversation Exchanges (Language Partner Matching & Facilitated) (EDAMAFAN)
Keywords
Where Tandem is headquartered
LocationHeadquarters
- HQ city
- Berlin
- HQ country
- Germany
- HQ region
- Europe
Offices2 records
Markets served
Tandem business model
Business model- GTM type
- B2C
- Offering type
- Software
- Cost components
- Technology or R&D, Personnel, Marketing or Sales, Operations
Revenue model
- Tandem Pro Subscription: Freemium model with free basic membership and premium Tandem Pro subscription offering enhanced features such as unlimited translations, advanced translation corrections, travel mode, and ad-free experience
- Subscription Recurring: Recurring subscription revenue from Tandem Pro paid memberships
Pricing tiers
| Model | Billing | Price |
|---|---|---|
| Freemium | Monthly | Free basic membership with core language exchange features |
| Subscription | Monthly | Tandem Pro premium subscription with enhanced features |
Go-to-market motion2 records
Distribution channels3 records
Marketing channels6 records
Tandem product offering
Product offeringCore offering
Tandem operates a peer-to-peer mobile language exchange platform that connects millions of native speakers worldwide so they can teach each other their languages through one-on-one conversation. The core Tandem Mobile Language Exchange App is free and supports chat, voice notes, audio calls, and video calls with built-in correction and translation tools, while Tandem Pro is the paid premium subscription that unlocks Travel Mode, unlimited translations, advanced translation corrections, and an ad-free experience.
Product overview
Tandem is a peer-to-peer language exchange platform consisting of the core Tandem Mobile Language Exchange App (available on iOS and Android) and the premium Tandem Pro subscription add-on. The platform connects millions of language learners worldwide, enabling them to teach each other their native languages through text, voice notes, audio calls, and video calls, supported by in-app correction and translation tools.
Differentiator
Problem solved
Functional benefit
Products and services
- Tandem Mobile Language Exchange App A peer-to-peer mobile language exchange application for iOS and Android that connects native speakers worldwide so they can teach each other their languages through text messaging, voice notes, audio calls, and video calls, with in-app correction and translation tools to support conversational fluency.
- Tandem Pro A premium subscription tier for the Tandem language exchange app that unlocks enhanced features including Travel Mode for finding local language partners, unlimited translations, advanced translation corrections, and an ad-free experience.
Quantifiable outcome
- Users report reaching fluency levels (e.g., from A2 to C1 exam preparation in one year)
- +1 more outcomes
Companies that use Tandem
Customer profileNamed customers5 records
Segments4 records
Ideal customer profiles2 records
Tandem technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature6 records
Tandem partnerships and signals
Strategic signalScale indicators6 records
Recent moves6 records
Expansion highlights6 records
Tandem competitors and assessment
Company assessmentDirect peers
- HelloTalk: HelloTalk is the largest direct competitor to Tandem, offering a peer-to-peer language exchange mobile app connecting native speakers for mutual learning via chat, voice, and translation. It targets the same user persona, employs a similar freemium model with VIP subscriptions, and competes head-to-head across Tandem's core geographies.
- italki: italki is a leading online language learning marketplace connecting learners with professional tutors and community teachers. While it leans more paid-tutor than pure peer exchange, it competes for the same pro-active learner segment and overlaps with Tandem's career-focused learner use cases.
- Preply: Preply is an online language tutoring marketplace that matches learners with vetted tutors across 50+ languages. Like italki, it competes with Tandem for paying learners, especially career-focused and certification-prep users willing to pay for accelerated outcomes.
Broad incumbents
- Duolingo: Duolingo is the category-defining consumer language learning app with hundreds of millions of users and a public-market valuation. It competes at the top-of-funnel acquisition layer and increasingly in conversational AI (Duolingo Max, Roleplay), making it the broadest incumbent threat to Tandem's positioning.
- Babbel: Babbel is a Berlin-based subscription language learning app offering self-paced courses across 14+ languages. Although based in the same city as Tandem, it focuses on structured curriculum rather than peer exchange, positioning as a premium incumbent for adult self-learners.
- Memrise: Memrise is a vocabulary- and phrase-focused language learning app with a large global user base and a freemium subscription model. It overlaps with Tandem at the top-of-funnel for casual learners but specializes in memorization rather than conversational exchange.
- Busuu: Busuu is a subscription language learning platform offering self-study courses with optional community feedback from native speakers. It sits between Tandem's peer-exchange model and Duolingo/Babbel's structured curriculum, making it a partial functional peer.
Emerging players
- Speaky: Speaky is a smaller peer-to-peer language exchange social network targeting global learners. It offers a comparable value proposition to Tandem but with lower brand recognition and scale, positioning it as a niche emerging peer.
- HiNative: HiNative is a language learning Q&A platform owned by Lang-8 where native speakers answer learner questions across dozens of language pairs. It complements peer exchange through asynchronous interaction and overlaps with Tandem's learner-to-native-speaker community model.
- ConversationExchange: ConversationExchange is a long-running web-based platform for finding in-person and online language exchange partners. It predates and parallels Tandem's mobile peer-matching concept but lacks the polished mobile product experience and engaged community of Tandem's app.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat5 records
Key risks6 records
Key highlights7 records
Customer concentration
Tandem social profiles
Digital presenceTandem financial estimates
Financial estimateRevenue estimate
Valuation estimate
Tandem leadership team
Management profileNumber of profiles
Profiles3 records
Tandem funding detail
Funding detailFunding overview
Funding rounds3 records
Investors10 records
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Tandem M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Tandem
What does Tandem do?
Tandem operates a peer-to-peer mobile language exchange platform that connects millions of native speakers worldwide so they can teach each other their languages through one-on-one conversation. The core Tandem Mobile Language Exchange App is free and supports chat, voice notes, audio calls, and video calls with built-in correction and translation tools, while Tandem Pro is the paid premium subscription that unlocks Travel Mode, unlimited translations, advanced translation corrections, and an ad-free experience.
Is Tandem a public or private company?
Tandem is a private company. It is classified as venture growth investor backed and is currently operating.
When was Tandem founded?
Tandem was founded in 2015. It employs 11 to 50 people.
Where is Tandem based?
Tandem is headquartered in Berlin, Germany, in the Europe region.
How does Tandem make money?
Two revenue lines are on record. Tandem Pro Subscription is the primary driver. The others are subscription Recurring.
Who are Tandem's main competitors?
Direct peers on record are HelloTalk, italki and Preply. Broad incumbents are Duolingo, Babbel, Memrise and Busuu. Emerging players are Speaky, HiNative and ConversationExchange.
Does Tandem have an API?
No public API is recorded for Tandem.
What industry is Tandem in?
Tandem's product category is Language Learning Platform. Its primary akta.pro industry code is EDAFAOAB, Online Tutoring, Conversation Exchange & Language Coaching Platforms, with a secondary code of EDAMAFAN, Teacher-Led Conversation Exchanges (Language Partner Matching & Facilitated).