Open source focus
Open Source Alternatives to Defensor
60 open source Cybersecurity options similar to Defensor, 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.
Snyk85AI Coding AssistantBoston, United States$488.5MOpen source · Self-hostable
UmbrasecCybersecurityOpen source
Mend60Open SourceTel Aviv, Israel$121.5MOpen source · Self-hostable
- TRTruffle Security47CybersecuritySan Francisco, United States$30.0M
Open source
Aikido Security65CybersecurityGhent, Belgium$84.4MOpen source
Chainguard62CybersecuritySeattle, United States$385.0MOpen source · Self-hostable
flox58EnterpriseSan Francisco, United States$42.6MOpen source
Backslash Security57CybersecurityTel Aviv, Israel$27.0MOpen source
MANIFEST56LegalNew York, United States$23.0MOpen source
Piiano54EnterpriseTel Aviv, Israel$9.0MOpen source
Mondoo50CybersecuritySan Francisco, United States$168.9MOpen source
ORY47Identity & Access ManagementBerlin, Germany$17.0MOpen source · Self-hostable
Slauth.io43EnterpriseAshburn, United States$1.5MOpen source · Self-hostable
Cipherwake30CybersecurityToronto, CanadaOpen source
KernelscanCybersecurityAichtal, GermanyOpen source · Self-hostable
OpenAI84Artificial IntelligenceSan Francisco, United States$493.9BOpen source
Tailscale74CybersecuritySan Francisco, United States$505.0MOpen source
Teleport69CybersecurityOakland, United States$190.0MOpen source
Aqua Security69EnterpriseSan Francisco, United States$400.5MOpen source
Team Cymru62CybersecurityOrem, USA$63.0MOpen source
Stytch61AuthenticationSan Francisco, USA$127.0MOpen source
Steel.dev58Developer ToolsTel Aviv, Israel$17.0MOpen source · Self-hostable
ARMO57EnterpriseTel Aviv, Israel$34.5MOpen source · Self-hostable
Boost Security57CybersecuritySan Francisco, USA$12.0MOpen source
Mobb55CybersecurityTel Aviv, Israel$5.4MOpen source
HoneyHive55CybersecuritySan Francisco, United States$10.0MOpen source
Pynt55CybersecurityTel Aviv, Israel$6.0MOpen source
Wing Cloud54EnterpriseTel Aviv, Israel$20.0MOpen source · Self-hostable
Knostic54Cybersecurity$14.3MOpen source
Lunar.dev53EnterpriseTel Aviv, Israel$6.0MOpen source
Permit.io51Identity ManagementTel Aviv, Israel$14.0MOpen source
Infisical51Developer ToolsSan Francisco, United States$34.8MOpen source · Self-hostable
Arcade48Artificial IntelligenceSan Francisco, USA$60.0MOpen source
Argon Security47EnterpriseTel Aviv, IsraelOpen source
Antithesis46CybersecuritySan Francisco, United States$117.5MOpen source
Runtime Verification41Software VerificationChampaign, United StatesOpen source
LettaAI38Artificial IntelligenceSan Francisco, United States$1.5MOpen source
OWASP37CybersecurityRaleigh, USAOpen source · Self-hostable
Dustico34EnterpriseTel Aviv, IsraelOpen source · Self-hostable
Illustria33EnterpriseSan Francisco, United StatesOpen source · Self-hostable
GitHub Advanced Security21CybersecuritySan Francisco, United StatesOpen source
Anchor.dev13CybersecuritySan Francisco, United StatesOpen source
0sec11CybersecurityTel Aviv, IsraelOpen source · Self-hostable
Citcall10CybersecurityJakarta, IndonesiaOpen source
- Attestely7Cybersecurity
Open source
PrivateGPT5AI Search EngineToronto, CanadaOpen source · Self-hostable
Gravitee4CybersecurityLondon, United KingdomOpen source
GakoCybersecurityOpen source · Self-hostable
- LegacyfixerLegacy System Modernization
Open source
DependencywatchCybersecurityOpen source · Self-hostable
- ExploitcheckCybersecurity
Open source
GuardianlayerCybersecuritySan Francisco, United StatesOpen source
1Password85CybersecurityToronto, Canada$1.2BOpen source
Forter85FintechNew York, United States$550.0MOpen source
Polygon81BlockchainMumbai, India$400.0MOpen source
Cursor80Artificial IntelligenceSan Francisco, United States$2.9BOpen source
Postman78API DevelopmentSan Francisco, United StatesOpen source
Exabeam78EnterpriseFoster City, United States$390.0MOpen source
TestMu AI (Formerly LambdaTest)77MLOpsSan Francisco, United States$121Open source
Together AI76AI InfrastructureSan Francisco, United States$906.0MOpen source · Self-hostable
| Company | Sector | License | HQ | Funding | Score | Website |
|---|---|---|---|---|---|---|
| Snyk | AI Coding Assistant | Open source · Self-hostable | Boston, United States | $488.5M | 85 | |
| Umbrasec | Cybersecurity | Open source | — | — | — | |
| Mend | Open Source | Open source · Self-hostable | Tel Aviv, Israel | $121.5M | 60 | |
| TRTruffle Security | Cybersecurity | Open source | San Francisco, United States | $30.0M | 47 | |
| Aikido Security | Cybersecurity | Open source | Ghent, Belgium | $84.4M | 65 | |
| Chainguard | Cybersecurity | Open source · Self-hostable | Seattle, United States | $385.0M | 62 | |
| flox | Enterprise | Open source | San Francisco, United States | $42.6M | 58 | |
| Backslash Security | Cybersecurity | Open source | Tel Aviv, Israel | $27.0M | 57 | |
| MANIFEST | Legal | Open source | New York, United States | $23.0M | 56 | |
| Piiano | Enterprise | Open source | Tel Aviv, Israel | $9.0M | 54 | |
| Mondoo | Cybersecurity | Open source | San Francisco, United States | $168.9M | 50 | |
| ORY | Identity & Access Management | Open source · Self-hostable | Berlin, Germany | $17.0M | 47 | |
| Slauth.io | Enterprise | Open source · Self-hostable | Ashburn, United States | $1.5M | 43 | |
| Cipherwake | Cybersecurity | Open source | Toronto, Canada | — | 30 | |
| Kernelscan | Cybersecurity | Open source · Self-hostable | Aichtal, Germany | — | — | |
| OpenAI | Artificial Intelligence | Open source | San Francisco, United States | $493.9B | 84 | |
| Tailscale | Cybersecurity | Open source | San Francisco, United States | $505.0M | 74 | |
| Teleport | Cybersecurity | Open source | Oakland, United States | $190.0M | 69 | |
| Aqua Security | Enterprise | Open source | San Francisco, United States | $400.5M | 69 | |
| Team Cymru | Cybersecurity | Open source | Orem, USA | $63.0M | 62 | |
| Stytch | Authentication | Open source | San Francisco, USA | $127.0M | 61 | |
| Steel.dev | Developer Tools | Open source · Self-hostable | Tel Aviv, Israel | $17.0M | 58 | |
| ARMO | Enterprise | Open source · Self-hostable | Tel Aviv, Israel | $34.5M | 57 | |
| Boost Security | Cybersecurity | Open source | San Francisco, USA | $12.0M | 57 | |
| Mobb | Cybersecurity | Open source | Tel Aviv, Israel | $5.4M | 55 | |
| HoneyHive | Cybersecurity | Open source | San Francisco, United States | $10.0M | 55 | |
| Pynt | Cybersecurity | Open source | Tel Aviv, Israel | $6.0M | 55 | |
| Wing Cloud | Enterprise | Open source · Self-hostable | Tel Aviv, Israel | $20.0M | 54 | |
| Knostic | Cybersecurity | Open source | — | $14.3M | 54 | |
| Lunar.dev | Enterprise | Open source | Tel Aviv, Israel | $6.0M | 53 | |
| Permit.io | Identity Management | Open source | Tel Aviv, Israel | $14.0M | 51 | |
| Infisical | Developer Tools | Open source · Self-hostable | San Francisco, United States | $34.8M | 51 | |
| Arcade | Artificial Intelligence | Open source | San Francisco, USA | $60.0M | 48 | |
| Argon Security | Enterprise | Open source | Tel Aviv, Israel | — | 47 | |
| Antithesis | Cybersecurity | Open source | San Francisco, United States | $117.5M | 46 | |
| Runtime Verification | Software Verification | Open source | Champaign, United States | — | 41 | |
| LettaAI | Artificial Intelligence | Open source | San Francisco, United States | $1.5M | 38 | |
| OWASP | Cybersecurity | Open source · Self-hostable | Raleigh, USA | — | 37 | |
| Dustico | Enterprise | Open source · Self-hostable | Tel Aviv, Israel | — | 34 | |
| Illustria | Enterprise | Open source · Self-hostable | San Francisco, United States | — | 33 | |
| GitHub Advanced Security | Cybersecurity | Open source | San Francisco, United States | — | 21 | |
| Anchor.dev | Cybersecurity | Open source | San Francisco, United States | — | 13 | |
| 0sec | Cybersecurity | Open source · Self-hostable | Tel Aviv, Israel | — | 11 | |
| Citcall | Cybersecurity | Open source | Jakarta, Indonesia | — | 10 | |
| Cybersecurity | Open source | — | — | 7 | ||
| PrivateGPT | AI Search Engine | Open source · Self-hostable | Toronto, Canada | — | 5 | |
| Gravitee | Cybersecurity | Open source | London, United Kingdom | — | 4 | |
| Gako | Cybersecurity | Open source · Self-hostable | — | — | — | |
| Legacy System Modernization | Open source | — | — | — | ||
| Dependencywatch | Cybersecurity | Open source · Self-hostable | — | — | — | |
| Cybersecurity | Open source | — | — | — | ||
| Guardianlayer | Cybersecurity | Open source | San Francisco, United States | — | — | |
| 1Password | Cybersecurity | Open source | Toronto, Canada | $1.2B | 85 | |
| Forter | Fintech | Open source | New York, United States | $550.0M | 85 | |
| Polygon | Blockchain | Open source | Mumbai, India | $400.0M | 81 | |
| Cursor | Artificial Intelligence | Open source | San Francisco, United States | $2.9B | 80 | |
| Postman | API Development | Open source | San Francisco, United States | — | 78 | |
| Exabeam | Enterprise | Open source | Foster City, United States | $390.0M | 78 | |
| TestMu AI (Formerly LambdaTest) | MLOps | Open source | San Francisco, United States | $121 | 77 | |
| Together AI | AI Infrastructure | Open source · Self-hostable | San Francisco, United States | $906.0M | 76 |