# Top 50 Open Source Startups Worldwide by Funding (2026)

> The 50 best-funded open source startups worldwide, ranked by total funding raised: $9.8B combined. With founding year, headquarters and each company's rounds.

Source: https://millionrounds.com/top-lists/open-source-startups (Millionrounds; every figure on the page links to its filing or article)

- 1 [**Reflection AI**](https://millionrounds.com/company/reflection-ai) *Founded* - United States **$3.0B** last round Oct 2025
- 2 [**Together AI** Together AI is a cloud-based platform designed for constructing open-source generative AI and infrastructure for developing AI models.](https://millionrounds.com/company/together-ai) Together AI is a cloud-based platform designed for constructing open-source generative AI and infrastructure for developing AI models. *Founded* 2022 San Francisco, United States **$1.1B** last round Jul 2026
- 3 [**Temporal** Temporal is a financial services and market infrastructure company focused on enhancing efficiency in financial markets, particularly in repo-like instruments a](https://millionrounds.com/company/temporal) Temporal is a financial services and market infrastructure company focused on enhancing efficiency in financial markets, particularly in repo-like instruments a *Founded* 2022 United States **$996M** last round Sept 2026
- 4 [**Supabase** Supabase is an open-source Backend-as-a-Service (BaaS) platform founded in 2020 and headquartered in San Francisco, California.](https://millionrounds.com/company/supabase) Supabase is an open-source Backend-as-a-Service (BaaS) platform founded in 2020 and headquartered in San Francisco, California. *Founded* 2020 Midland, United States **$950M** last round Oct 2026
- 5 [**Chainguard** Chainguard is a cybersecurity company founded in 2021, focused on software supply chain security.](https://millionrounds.com/company/chainguard) Chainguard is a cybersecurity company founded in 2021, focused on software supply chain security. *Founded* 2021 Kirkland, United States **$776M** last round Oct 2025
- 6 [**Odoo** Odoo offers an integrated suite of business apps built through an open-source development model.](https://millionrounds.com/company/odoo) Odoo offers an integrated suite of business apps built through an open-source development model. *Founded* 2002 Louvain-la-Neuve, Belgium **$631M** last round Nov 2024
- 7 [**LangChain** LangChain is an artificial intelligence company based in San Francisco, founded in 2022 by Harrison Chase and Ankush Gola.](https://millionrounds.com/company/langchain) LangChain is an artificial intelligence company based in San Francisco, founded in 2022 by Harrison Chase and Ankush Gola. *Founded* 2022 San Francisco, United States **$425M** last round Nov 2026
- 8 [**ClickHouse** ClickHouse is a technology company that develops ClickHouse®, an open-source, column-oriented OLAP database management system designed for real-time analytics a](https://millionrounds.com/company/clickhouse) ClickHouse is a technology company that develops ClickHouse®, an open-source, column-oriented OLAP database management system designed for real-time analytics a *Founded* 2021 Palo Alto, United States **$400M** last round Jan 2026
- 9 [**Nous Research** Nous Research is an American open-source AI research lab founded in 2023.](https://millionrounds.com/company/nous-research) Nous Research is an American open-source AI research lab founded in 2023. *Founded* 2023 Austin, United States **$215M** last round Oct 2026
- 10 [**Anaconda** Anaconda is a software company founded in 2012 and based in Austin, Texas.](https://millionrounds.com/company/anaconda) Anaconda is a software company founded in 2012 and based in Austin, Texas. *Founded* 2012 Austin, United States **$172M** last round Jul 2025
- 11 [**Arcee AI** Arcee AI is a U.S.](https://millionrounds.com/company/arcee-ai) Arcee AI is a U.S. *Founded* 2023 San Francisco, United States **$150M** last round Sept 2026
- 12 [**PostHog** PostHog is a San Francisco-based company founded in 2020 by James Hawkins and Tim Glaser.](https://millionrounds.com/company/posthog) PostHog is a San Francisco-based company founded in 2020 by James Hawkins and Tim Glaser. *Founded* 2020 San Francisco, United States **$145M** last round Sept 2025
- 13 [**Bluesky** An Integrated Promotional Marketing Company Blue Sky Marketing Group (BSMG) is a full service marketing agency that specializes in promotional products.](https://millionrounds.com/company/bluesky) An Integrated Promotional Marketing Company Blue Sky Marketing Group (BSMG) is a full service marketing agency that specializes in promotional products. *Founded* 1997 Northbrook, United States **$124M** last round Mar 2026
- 14 [**Socket** Socket provides telephone, television and basic dial-up internet service.](https://millionrounds.com/company/socket) Socket provides telephone, television and basic dial-up internet service. *Founded* 1994 Columbia, United States **$107M** last round May 2026
- 15 [**Ollama** Get up and running with large language models.](https://millionrounds.com/company/ollama) Get up and running with large language models. *Founded* 2023 Palo Alto, United States **$65M** last round Jul 2026
- 16 [**Qdrant** Qdrant is a Berlin-based company that specializes in open-source vector databases and high-performance vector search engines.](https://millionrounds.com/company/qdrant) Qdrant is a Berlin-based company that specializes in open-source vector databases and high-performance vector search engines. *Founded* 2021 Berlin, Germany **$50M** last round Mar 2026
- 17 [**Unleash**](https://millionrounds.com/company/unleash) *Founded* - Norway **$38M** last round Mar 2026
- 18 [**NetBox Labs** NetBox Labs is a technology company based in New York, founded in 2023.](https://millionrounds.com/company/netbox-labs) NetBox Labs is a technology company based in New York, founded in 2023. *Founded* 2023 New York, United States **$35M** last round Jul 2025
- 19 [**Vates** Vates is a consultancy that specializes in analysis, research products, and risk management.](https://millionrounds.com/company/vates) Vates is a consultancy that specializes in analysis, research products, and risk management. *Founded* 2014 France **$34M** last round Oct 2026
- 20 [**Dify** Dify.AI is an open-source platform designed for developing, deploying, and managing Large Language Model (LLM) applications.](https://millionrounds.com/company/dify) Dify.AI is an open-source platform designed for developing, deploying, and managing Large Language Model (LLM) applications. *Founded* 2023 Menlo Park, United States **$30M** last round Mar 2026
- 21 [**Flox** Flox is a software development platform that creates reproducible environments for the entire software lifecycle.](https://millionrounds.com/company/flox) Flox is a software development platform that creates reproducible environments for the entire software lifecycle. *Founded* 2021 New York, United States **$29M** last round Sept 2025
- 22 [**CopilotKit** The full-stack framework for building user interactive agents and copilots.](https://millionrounds.com/company/copilotkit) The full-stack framework for building user interactive agents and copilots. *Founded* 2023 Seattle, United States **$27M** last round May 2026
- 23 [**Truffle Security** Truffle Security is an open source cybersecurity company that offers solutions for finding and remediating leaked software credentials.](https://millionrounds.com/company/truffle-security) Truffle Security is an open source cybersecurity company that offers solutions for finding and remediating leaked software credentials. *Founded* 2021 San Francisco, United States **$25M** last round Nov 2025
- 24 [**Polars** Polars is an open-source DataFrame library and high-performance data processing solution, founded in 2020 and evolved into Polars Inc.](https://millionrounds.com/company/polars) Polars is an open-source DataFrame library and high-performance data processing solution, founded in 2020 and evolved into Polars Inc. *Founded* 2020 Amsterdam, Netherlands **$21M** last round Sept 2025
- 25 [**Mem0** Mem0 is a San Francisco-based AI infrastructure company founded in 2023.](https://millionrounds.com/company/mem0) Mem0 is a San Francisco-based AI infrastructure company founded in 2023. *Founded* 2023 San Francisco, United States **$20M** last round Oct 2025
- 26 [**Featherless.ai** Featherless AI is a technology company based in San Francisco, founded in 2023 by Eugene Cheah, Harrison Vanderbyl, and Wesley George.](https://millionrounds.com/company/featherless-ai) Featherless AI is a technology company based in San Francisco, founded in 2023 by Eugene Cheah, Harrison Vanderbyl, and Wesley George. *Founded* 2023 San Francisco, United States **$20M** last round Apr 2026
- 27 [**Discourse** Discourse is an open-source community platform founded in 2012 by Jeff Atwood, Robin Ward, and Sam Saffron.](https://millionrounds.com/company/discourse) Discourse is an open-source community platform founded in 2012 by Jeff Atwood, Robin Ward, and Sam Saffron. *Founded* 2012 Chicago, United States **$20M** last round Aug 2021
- 28 [**Rerun** Rerun is a technology company based in Stockholm, founded in 2022.](https://millionrounds.com/company/rerun) Rerun is a technology company based in Stockholm, founded in 2022. *Founded* 2022 Lillhaerdal, Sweden **$17M** last round Mar 2025
- 29 [**Polar**](https://millionrounds.com/company/polar) *Founded* - United States **$16M** last round Jul 2026
- 30 [**Nirmata** Nirmata is an enterprise technology company based in San Jose, California, specializing in cloud-native security policy automation and Kubernetes management.](https://millionrounds.com/company/nirmata) Nirmata is an enterprise technology company based in San Jose, California, specializing in cloud-native security policy automation and Kubernetes management. *Founded* 2017 Santa Clara, United States **$14M** last round Feb 2025
- 31 [**Passbolt** Passbolt is an open-source credential platform based in Luxembourg, designed for security-conscious IT, agile, and DevOps teams.](https://millionrounds.com/company/passbolt) Passbolt is an open-source credential platform based in Luxembourg, designed for security-conscious IT, agile, and DevOps teams. *Founded* 2017 Esch-sur-Alzette, Luxembourg **$12M** last round Jan 2025
- 32 [**NanoCo**](https://millionrounds.com/company/nanoco) *Founded* - United States **$12M** last round May 2026
- 33 [**Lightdash** Lightdash turns a dbt project into a full-stack BI platform.](https://millionrounds.com/company/lightdash) Lightdash turns a dbt project into a full-stack BI platform. *Founded* 2020 San Francisco, United Kingdom **$11M** last round Oct 2024
- 34 [**Merit Systems** Merit Systems is a software development company based in Brooklyn, New York, founded in 2024.](https://millionrounds.com/company/merit-systems) Merit Systems is a software development company based in Brooklyn, New York, founded in 2024. *Founded* 2024 New York, United States **$10M** last round Jan 2025
- 35 [**Syntasso** Syntasso are the creators of Kratix, the open-source framework for building platforms: https://kratix.io/](https://millionrounds.com/company/syntasso) Syntasso are the creators of Kratix, the open-source framework for building platforms: https://kratix.io/ *Founded* 2021 Fleet, United Kingdom **$8.6M** last round Jul 2023
- 36 [**Kilo Code**](https://millionrounds.com/company/kilo-code) *Founded* - United States **$8.0M** last round Dec 2025
- 37 [**Mermaid Chart** Building the next generation of smart diagramming for enterprise teams.](https://millionrounds.com/company/mermaid-chart) Building the next generation of smart diagramming for enterprise teams. *Founded* 2021 San Francisco, United States **$7.5M** last round May 2025
- 38 [**TensorZero** TensorZero is an open-source LLMOps platform designed for building, optimizing, and deploying large language model (LLM) applications.](https://millionrounds.com/company/tensorzero) TensorZero is an open-source LLMOps platform designed for building, optimizing, and deploying large language model (LLM) applications. *Founded* - New York, United States **$7.3M** last round Aug 2025
- 39 [**AppFlowy** AppFlowy is an open-source workspace platform founded in November 2021, offering a privacy-first alternative to Notion.](https://millionrounds.com/company/appflowy) AppFlowy is an open-source workspace platform founded in November 2021, offering a privacy-first alternative to Notion. *Founded* 2022 Singapore, Singapore **$6.4M** last round Nov 2023
- 40 [**Gun.io** Gun.io is a Nashville-based company that connects elite, vetted software developers with businesses for freelance, contract-to-hire, and full-time roles.](https://millionrounds.com/company/gun-io) Gun.io is a Nashville-based company that connects elite, vetted software developers with businesses for freelance, contract-to-hire, and full-time roles. *Founded* 2013 Nashville, United States **$5.2M** last round Aug 2022
- 41 [**Better Auth**](https://millionrounds.com/company/better-auth) *Founded* - Ethiopia **$5.0M** last round Jun 2025
- 42 [**Klotho** Klotho is an open source tool enabling adaptive cloud applications through Architecture-from-Code and intelligent code transformations](https://millionrounds.com/company/klotho) Klotho is an open source tool enabling adaptive cloud applications through Architecture-from-Code and intelligent code transformations *Founded* 2021 Los Angeles, United States **$4.5M** last round Aug 2023
- 43 [**Bruno** Digital insurance advisor](https://millionrounds.com/company/bruno) Digital insurance advisor *Founded* 2019 United States **$4.2M** last round Aug 2026
- 44 [**Hunted Labs** Hunted Labs is a software security company founded in 2023, with a public launch planned for 2025.](https://millionrounds.com/company/hunted-labs) Hunted Labs is a software security company founded in 2023, with a public launch planned for 2025. *Founded* 2023 Austell, United States **$3.0M** last round Mar 2025
- 45 [**Parseable** Free and Open Source Log Storage and Observability Platform](https://millionrounds.com/company/parseable) Free and Open Source Log Storage and Observability Platform *Founded* 2022 United States **$2.8M** last round May 2024
- 46 [**Vizor.io** Vizor is a platform for creating & sharing VR on the web.](https://millionrounds.com/company/vizor-io) Vizor is a platform for creating & sharing VR on the web. *Founded* 2015 Helsinki, Finland **$2.3M** last round Apr 2017
- 47 [**PearAI** Pear.ai is an energy-operations software company based in San Francisco, founded in 2016.](https://millionrounds.com/company/pearai) Pear.ai is an energy-operations software company based in San Francisco, founded in 2016. *Founded* 2016 San Francisco, United States **$1.5M** last round Dec 2024
- 48 [**Primal** Bringing content that matters to you.](https://millionrounds.com/company/primal) Bringing content that matters to you. *Founded* 2004 Kitchener, United States **$1.0M** last round Jul 2023
- 49 [**GitLinks** GitLinks monitors open source usage for enterprise, identifying risks in security, licensing, and updating.](https://millionrounds.com/company/gitlinks) GitLinks monitors open source usage for enterprise, identifying risks in security, licensing, and updating. *Founded* 2016 Austin **$235K** last round Oct 2017
- 50 [**OhmData** OhmData is an open, simple, and scalable platform as a service that provides HBase support to some of the top early adopters of databases.](https://millionrounds.com/company/ohmdata) OhmData is an open, simple, and scalable platform as a service that provides HBase support to some of the top early adopters of databases. *Founded* 2013 United States **$185K** last round Apr 2014

**Total funding** how the list is ranked

**15 November 2026** updated nightly

**Rounds we track** source: Millionrounds

Companies whose funding rounds we classed as this sector, ranked by the total they have raised in rounds we hold. Nobody pays to be on a list.

## Who backed them?

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## More open source lists

[See all](https://millionrounds.com/top-lists?t=Open%20source)

[*O* *Q* *U* **Open source startups in Europe** 10 companies · $824M](https://millionrounds.com/top-lists/open-source-startups-europe)

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