Horizon3.ai vs Terra Security
Which Testing & QA AI tool is better in 2026?
Horizon3.ai
Autonomous penetration testing with NodeZero, run continuously at production scale
Terra Security
Agentic offensive security platform for continuous AI-driven penetration testing
Side-by-side
Horizon3.ai is the more established option (raised $178.5M); pricing is comparable on both sides.
| Metric | Horizon3.ai | Terra Security |
|---|---|---|
| Taglinei | Autonomous penetration testing with NodeZero, run continuously at production scale | Agentic offensive security platform for continuous AI-driven penetration testing |
| Foundedi | 2019🏆 | 2023 |
| HQi | San Francisco, United States | Tel Aviv, IL |
| Employeesi | 201-500🏆 | 11-50 |
| Neuron scorei | 72🏆 | 53 |
| Total fundingi | $178.5M🏆 | $38M |
| Latest roundi | Series D · Jun 2025 | Series A |
| Valuationi | — | — |
| Cheapest paid plani | Pricing not disclosed | Pricing not disclosed |
| Free plani | ✗ | ✓ |
| Free triali | ✓ | ✓ |
| Top tier pricei | Pricing not disclosed | Pricing not disclosed |
| Pricing summaryi | Enterprise · Contact sales | Free |
| Categoriesi |
Capability matrix
Developer-facing capabilities and access signals for Horizon3.ai and Terra Security.
| Capability | Horizon3.ai | Terra Security |
|---|---|---|
| MCP support | ✗ | ✗ |
| Public API | ✓ | ✓ |
| Webhooks | ✗ | ✗ |
| OAuth 2.0 | ✗ | ✗ |
| SDK languages | — | — |
| Free plan | ✗ | ✓ |
| Free trial | ✓ | ✓ |
| Verified | ✗ | ✗ |
| Active deal | ✗ | ✗ |
🟢 Strengths of Horizon3.ai
- Has raised more capital ($178.5M vs $38M)
- Higher Neuron score (72 vs 53)
- More mature (2019)
🔵 Strengths of Terra Security
- Offers a free plan
- Newer company (2023)
Which should you choose?
Choose Terra Security if price matters most — it starts at Free, which is friendlier for teams watching burn. Both AI Testing & QA tools ship core features, so the cost delta often decides it for small teams and solo operators.
Choose Horizon3.ai if you want the most established option — it has raised $178.5M, suggesting more runway for enterprise features, support, and long-term roadmap. For mission-critical workflows or larger teams, that stability often outweighs a lower monthly price.
Frequently asked questions
Horizon3.ai vs Terra Security — which is better?
It depends on your priority. Horizon3.ai has raised more capital and is the more established option; Terra Security has broader feature depth. See the side-by-side table above.
Is Horizon3.ai cheaper than Terra Security?
No — Terra Security's cheapest paid plan is Free, while Horizon3.ai's is Enterprise · Contact sales.
Do Horizon3.ai and Terra Security offer free plans?
Horizon3.ai: Free trial only. Terra Security: Yes, has a free plan.
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