Open source focus
21st.dev is open source
Open Source Alternatives to 21st.dev
60 open source AI options similar to 21st.dev, ranked by named competitors first, sector overlap, and our 0-100 AI-readiness score. Each profile notes license and self-hosting where we have it.
Continue61AISan Francisco, United States$70.1MOpen source
JetBrains60Software DevelopmentPrague, Czech RepublicOpen source
Axiom Quant58Artificial IntelligenceSan Francisco, United States$264.0MOpen source
BLACKBOX.AI57AISan Francisco, United States$38.3MOpen source
GitGuardian56CybersecurityParis, France$50.0MOpen source
ElevenLabs79AILondon, United Kingdom$1.6BOpen source
Hugging Face76AINew York, United States$395.2MOpen source · Self-hostable
- LALacework70AISan Jose, United States$1.3B
Open source
XBOW69CybersecuritySeattle, United States$215.0MOpen source
Chainalysis67FintechNew York, United States$170.0MOpen source
- VEVeeva Systems67SaaSPleasanton, United States$7.0M
Open source
XMTP63AISan Francisco, United States$49.9MOpen source
- STStackOne62AILondon, United Kingdom$23.6M
Open source
- TOTonic.ai62AISan Francisco, United States$43.0M
Open source
Zendesk62Customer ServiceSan Francisco, United States$500KOpen source
Veracode62CybersecurityBurlington, United States$40.0MOpen source
- UPUpstash62SaaSSan Jose, United States$11.9M
Open source
Ox Security62EnterpriseBoston, United States$154.0MOpen source
- NANasuni61SaaSBoston, United States$219.0M
Open source
Dataiku60Artificial IntelligenceNew York, United States$200.0MOpen source
Fair Isaac Corporation (FICO)60Financial ServicesBozeman, United StatesOpen source
Gretel AI58Artificial IntelligenceSan Diego, United States$65.5MOpen source
Altana58AINew York, United States$200.0MOpen source
- AMAmigo AI58Artificial IntelligenceNew York, United States$17.3M
Open source
Essential AI58AISan Francisco, United States$239.8MOpen source
Quotient AI56Artificial IntelligenceBoston, United States$5.5MOpen source
EvolutionaryScale55AISan Francisco, United States$142.0MOpen source
- OPOpenlayer55AISan Francisco, United States$19.3M
Open source
- ESEscape55CybersecurityParis, France$21.9M
Open source
- SESerpApi55SaaSAustin, United States$100K
Open source
Tensorlake54Artificial IntelligenceSan Francisco, United States$8.0MOpen source
Theori54CybersecurityAustin, United States$15.4MOpen source
Crossmint54FintechMiami, United States$23.6MOpen source
Zyphra53AISan Francisco, United States$110.1MOpen source
- EMEmpower AI52AIReston, United States$20.0M
Open source
Escape Technologies52CybersecurityBiarritz, France$21.9MOpen source
TanStack50Software DevelopmentSan Francisco, Canada$1.0MOpen source · Self-hostable
Hathora50GamingNew York City, United States$7.6MOpen source
Domo50Business IntelligenceAmerican Fork, United States$33.0MOpen source
- AXAxiomatic AI50Artificial IntelligenceCambridge, United States$24.0M
Open source
- ZEZeroPath50CybersecuritySan Francisco, United States$20.5M
Open source
Respan49Artificial IntelligenceSan Francisco, United States$5.0MOpen source
- SISinequa49AIParis, France$28.2M
Open source
- DIDiscovery Education48EdTechCharlotte, United States$646.0M
Open source
- BUBunzz48Web3Tokyo, Japan$4.5M
Open source
- SCSCRAPYBARA48AISan Francisco, United States$500K
Open source
MOSTLY AI46AIVienna, Austria$25.0MOpen source
Horizon3.ai46AISan Francisco, United States$590.0MOpen source
- CLCline46AISan Francisco, United States$27.0M
Open source
Glide Identity45CybersecuritySan Francisco, United States$25.0MOpen source
- ZYZymtrace45Artificial IntelligenceWilmington, United States$12.2M
Open source
- CRCrash Override44CybersecuritySan Francisco, United States$5.0M
Open source
OpenServ44AILondon, United Kingdom$313KOpen source
CiaoDott43HealthcareMilan, Italy$1.6MOpen source
- SUSupermemory43AISan Francisco, United States$4.1M
Open source
- GEGecko Security43AISan Francisco, United States$500K
Open source
t54 Labs41AIDublin, United States$5.0MOpen source
GirlfriendGPT41AI$140KOpen source
Voltron Data40AIMountain View, United States$110.0MOpen source
Docrounds20HealthTechOpen source
| Company | Sector | License | HQ | Funding | Score | Website |
|---|---|---|---|---|---|---|
| Continue | AI | Open source | San Francisco, United States | $70.1M | 61 | |
| JetBrains | Software Development | Open source | Prague, Czech Republic | — | 60 | |
| Axiom Quant | Artificial Intelligence | Open source | San Francisco, United States | $264.0M | 58 | |
| BLACKBOX.AI | AI | Open source | San Francisco, United States | $38.3M | 57 | |
| GitGuardian | Cybersecurity | Open source | Paris, France | $50.0M | 56 | |
| ElevenLabs | AI | Open source | London, United Kingdom | $1.6B | 79 | |
| Hugging Face | AI | Open source · Self-hostable | New York, United States | $395.2M | 76 | |
| LALacework | AI | Open source | San Jose, United States | $1.3B | 70 | |
| XBOW | Cybersecurity | Open source | Seattle, United States | $215.0M | 69 | |
| Chainalysis | Fintech | Open source | New York, United States | $170.0M | 67 | |
| VEVeeva Systems | SaaS | Open source | Pleasanton, United States | $7.0M | 67 | |
| XMTP | AI | Open source | San Francisco, United States | $49.9M | 63 | |
| STStackOne | AI | Open source | London, United Kingdom | $23.6M | 62 | |
| TOTonic.ai | AI | Open source | San Francisco, United States | $43.0M | 62 | |
| Zendesk | Customer Service | Open source | San Francisco, United States | $500K | 62 | |
| Veracode | Cybersecurity | Open source | Burlington, United States | $40.0M | 62 | |
| UPUpstash | SaaS | Open source | San Jose, United States | $11.9M | 62 | |
| Ox Security | Enterprise | Open source | Boston, United States | $154.0M | 62 | |
| NANasuni | SaaS | Open source | Boston, United States | $219.0M | 61 | |
| Dataiku | Artificial Intelligence | Open source | New York, United States | $200.0M | 60 | |
| Fair Isaac Corporation (FICO) | Financial Services | Open source | Bozeman, United States | — | 60 | |
| Gretel AI | Artificial Intelligence | Open source | San Diego, United States | $65.5M | 58 | |
| Altana | AI | Open source | New York, United States | $200.0M | 58 | |
| AMAmigo AI | Artificial Intelligence | Open source | New York, United States | $17.3M | 58 | |
| Essential AI | AI | Open source | San Francisco, United States | $239.8M | 58 | |
| Quotient AI | Artificial Intelligence | Open source | Boston, United States | $5.5M | 56 | |
| EvolutionaryScale | AI | Open source | San Francisco, United States | $142.0M | 55 | |
| OPOpenlayer | AI | Open source | San Francisco, United States | $19.3M | 55 | |
| ESEscape | Cybersecurity | Open source | Paris, France | $21.9M | 55 | |
| SESerpApi | SaaS | Open source | Austin, United States | $100K | 55 | |
| Tensorlake | Artificial Intelligence | Open source | San Francisco, United States | $8.0M | 54 | |
| Theori | Cybersecurity | Open source | Austin, United States | $15.4M | 54 | |
| Crossmint | Fintech | Open source | Miami, United States | $23.6M | 54 | |
| Zyphra | AI | Open source | San Francisco, United States | $110.1M | 53 | |
| EMEmpower AI | AI | Open source | Reston, United States | $20.0M | 52 | |
| Escape Technologies | Cybersecurity | Open source | Biarritz, France | $21.9M | 52 | |
| TanStack | Software Development | Open source · Self-hostable | San Francisco, Canada | $1.0M | 50 | |
| Hathora | Gaming | Open source | New York City, United States | $7.6M | 50 | |
| Domo | Business Intelligence | Open source | American Fork, United States | $33.0M | 50 | |
| AXAxiomatic AI | Artificial Intelligence | Open source | Cambridge, United States | $24.0M | 50 | |
| ZEZeroPath | Cybersecurity | Open source | San Francisco, United States | $20.5M | 50 | |
| Respan | Artificial Intelligence | Open source | San Francisco, United States | $5.0M | 49 | |
| SISinequa | AI | Open source | Paris, France | $28.2M | 49 | |
| DIDiscovery Education | EdTech | Open source | Charlotte, United States | $646.0M | 48 | |
| BUBunzz | Web3 | Open source | Tokyo, Japan | $4.5M | 48 | |
| SCSCRAPYBARA | AI | Open source | San Francisco, United States | $500K | 48 | |
| MOSTLY AI | AI | Open source | Vienna, Austria | $25.0M | 46 | |
| Horizon3.ai | AI | Open source | San Francisco, United States | $590.0M | 46 | |
| CLCline | AI | Open source | San Francisco, United States | $27.0M | 46 | |
| Glide Identity | Cybersecurity | Open source | San Francisco, United States | $25.0M | 45 | |
| ZYZymtrace | Artificial Intelligence | Open source | Wilmington, United States | $12.2M | 45 | |
| CRCrash Override | Cybersecurity | Open source | San Francisco, United States | $5.0M | 44 | |
| OpenServ | AI | Open source | London, United Kingdom | $313K | 44 | |
| CiaoDott | Healthcare | Open source | Milan, Italy | $1.6M | 43 | |
| SUSupermemory | AI | Open source | San Francisco, United States | $4.1M | 43 | |
| GEGecko Security | AI | Open source | San Francisco, United States | $500K | 43 | |
| t54 Labs | AI | Open source | Dublin, United States | $5.0M | 41 | |
| GirlfriendGPT | AI | Open source | — | $140K | 41 | |
| Voltron Data | AI | Open source | Mountain View, United States | $110.0M | 40 | |
| Docrounds | HealthTech | Open source | — | — | 20 |