The fastest-growing open-source startups in Q1 2021

Snapshot of ROSS Index featuring top open-source startups by Github stars growth of their repositories. All descriptions below are based on public data and were up-to-date at the end of Q1 2021.
  1. DoltHub (dolthub/dolt, 8.3K stars, 21500% AGR). Data platform with version control and collaboration tools (Git for data). Founded in 2018 in Los Angeles and raised $5M from Timothy Sehn.
  2. Lbry (lbryio/lbry-desktop, 3.8K stars, 5061% AGR). Content sharing and publishing decentralized platform. Founded in 2015 in Manchester and raised $0.5M from Pillar VC.
  3. Penpot (penpot/penpot, 3.7K stars, 4562% AGR). Design and prototyping platform meant for cross-domain teams. Founded in 2019 in Madrid and has no known external funding.
  4. Athens Research (athensresearch/athens, 3.9K stars, 1244% AGR). Note-taking app (alternative to Roam Research). Founded in 2020 in San Francisco and raised $125K from Y Combinator.
  5. Infracost (infracost/infracost, 2.7K stars, 762% AGR). Cost estimation tool for DevOps, SRE and developers . Founded in 2020 in Edinburgh and raised $125K from Y Combinator.
  6. Appwrite (appwrite/appwrite, 6.4K stars, 632% AGR). Backend-as-a-service for web, mobile and Flutter developers. Founded in 2019 in Tel Aviv and has no known external funding.
  7. Appsmith (appsmithorg/appsmith, 2.1K stars, 582% AGR). Framework for the building of admin panels, CRUD apps and workflows. Founded in 2019 in Bengaluru and has no known external funding.
  8. Papercups (papercups-io/papercups, 3.8K stars, 548% AGR). Customer messaging service (open-source alternative to Intercom). Founded in 2020 in San Francisco and raised $125K from Y Combinator and Lombardstreet Ventures
  9. Supabase (supabase/supabase, 7.1K stars, 462% AGR). RESTful APIs for PostgreSQL without a single line of code (open-source alternative to Firebase). Founded in 2020 in Singapore and raised $6.1M from Coatue and Y Combinator.
  10. Parity Technologies (paritytech/polkadot, 2.9K stars, 419% AGR). Blockchain infrastructure developer, mostly known for its involvement in Polkadot. Founded in 2015 in London and raised $5.8M from Fenbushi Capital, Blockchain Capital, etc
  11. ORY (ory/kratos, 2.8K stars, 395% AGR). Identity Infrastructure for cloud developers. Founded in 2015 in Munich and has no known external funding.
  12. Jina AI (jina-ai/jina, 2.7K stars, 393% AGR). Neural search ecosystem for businesses and developers. Founded in 2020 in Berlin and raised $7.5M from GGV Capital,, Yunqi Partners.
  13. Dendron (dendronhq/dendron, 1.6K stars, 387% AGR). Note taking tool. Founded in 2019 in Seattle and raised $2M from Fuse VC
  14. Plausible (plausible/analytics, 7.1K stars, 371% AGR). Web analytics (open-source alternative to Google Analytics). Founded in 2018 in Estonia and has no known external funding.
  15. Project Discovery (projectdiscovery/nuclei, 3.5K stars, 362% AGR). Automated cloud-based reconnaissance and monitoring for IT security. Founded in 2019 in Mumbai and raised $1.7M from Accel, SignalFire, Rain Capital.
  16. Tailwind Labs (tailwindlabs/headlessui, 5.6K stars, 359% AGR). Developer of popular US framework Tailwind CSS. Founded in 2017 in Cambridge and has no known external funding.
  17. Vectorized (vectorizedio/redpanda, 1.9K stars, 315% AGR). Event streaming platform (replacement for Apache Kafka). Founded in 2019 in San Francisco and raised $15.5M from Lightspeed, GV
  18. Hummingbot (coinalpha/hummingbot, 1.5K stars, 299% AGR). Bot framework for customizable crypto trading strategies. Founded in 2017 in Mountain View and raised $5.1M from Bain Capital, Collider Ventures, etc
  19. Heartlex (heartexlabs/label-studio, 5.4K stars, 285% AGR). Platform for data labelling. Founded in 2019 in San Francisco and raised $150K from 500 Startups and Creative Destruction Lab.
  20. Modulz (modulz/stitches, 2.3K stars, 282% AGR). Code-based tool for designing and prototyping. Founded in 2019 in Dublin and raised $5.4M from LocalGlobe, Frontline, Tiny VC.


Anyone with a featuring on ROSS Index Q1 2021 can add the badge to their own website to let site visitors know they are one of the fastest-growing open-source startups.

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