# UnderDefense alternatives: what AI models name instead, October 2026

IT AI Recommendation Index, October 2026 Edition. 226 of the 252 answers in the 1 category where UnderDefense holds a standing named it neither first nor as an alternative; these are the first choices those answers made. Page: https://it-ai-index.com/vendors/underdefense/alternatives/

## Named instead, most often (every category and segment added)

- Cobalt: 37
- NetSPI: 32
- BreachLock: 19
- Synack: 17
- Astra Security: 10
- Bright Defense: 5

## Penetration testing as a service

**Small business**: 69 of 84 answers did not name UnderDefense (UnderDefense is #6 of 8 at 2%).

- Cobalt: first choice in 13 of those 69
- Astra Security: first choice in 8 of those 69
- BreachLock: first choice in 8 of those 69
- Bright Defense: first choice in 4 of those 69
- Acunetix: first choice in 3 of those 69
- Pentest-Tools.com: first choice in 2 of those 69
- Bug Circuit: first choice in 1 of those 69
- Bugcrowd: first choice in 1 of those 69

**Mid-market**: 74 of 84 answers did not name UnderDefense (UnderDefense is #5 of 10 at 4%).

- Cobalt: first choice in 18 of those 74
- BreachLock: first choice in 8 of those 74
- Synack: first choice in 3 of those 74
- Astra Security: first choice in 2 of those 74
- Bishop Fox: first choice in 1 of those 74
- Bright Defense: first choice in 1 of those 74
- Bug Circuit: first choice in 1 of those 74
- Bugcrowd: first choice in 1 of those 74

**Enterprise**: 83 of 84 answers did not name UnderDefense.

- NetSPI: first choice in 32 of those 83
- Synack: first choice in 14 of those 83
- Cobalt: first choice in 6 of those 83
- Bishop Fox: first choice in 3 of those 83
- BreachLock: first choice in 3 of those 83
- Bugcrowd: first choice in 1 of those 83
- Bugcrowd's PTaaS Subscription: first choice in 1 of those 83
- DeepStrike: first choice in 1 of those 83

Published under CC BY 4.0. The output is the models' output; nothing here is a recommendation by the index.