Best LLM Security Tools in 2026
Updated
In short: Amazon Bedrock Guardrails is ranked #1 of 26 as of 4 October 2026, ahead of PromptGuard and WitnessAI. The best-ranked option with a free plan is PromptGuard. The lowest first paid tier on this page is Amazon Bedrock Guardrails at $0.07/mo.
Safeguarding an LLM application can involve controls for different kinds of risk. Compare model-abuse detection, output guardrails, and prompt injection defense, then consider whether PII redaction or secrets detection is relevant to your needs. Deployment model helps you assess operational fit, while free-plan availability and paid-from pricing provide cost points to weigh. The entries include Sanctum Runtime, Amazon Bedrock Guardrails, and Openlayer Guardrails, along with PromptGuard and GLACIS. Lasso AI Security Platform, WitnessAI, and HiddenLayer AI Guardrails are also listed. Match the specific protections and deployment options shown to the safeguards you are looking to put in place.
26 LLM security tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
Recognised 40% · Phone app 26% · Documented 20% · Free plan 14% of the score
- 1 Amazon Bedrock Guardrails No phone app RecognisedPhone appDocumentedFree plan 7.9$0.07/mo Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 2 PromptGuard No phone app RecognisedPhone appDocumentedFree plan 7.8$19/mo
- 3 WitnessAI No phone app RecognisedPhone appDocumentedFree plan 7.2 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 4 LLM Guard No phone app RecognisedPhone appDocumentedFree plan 7.1 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 5 NVIDIA NeMo Guardrails No phone app RecognisedPhone appDocumentedFree plan 7.1 Prompt injection defense: YesPII redaction: Yes
- 6 GLACIS No phone app RecognisedPhone appDocumentedFree plan 7.1Free Prompt injection defense: YesPII redaction: Yes
- 7 Guardrails AI No phone app RecognisedPhone appDocumentedFree plan 7.0 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 8 Lasso AI Security Platform No phone app RecognisedPhone appDocumentedFree plan 7.0 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 9 Openlayer Guardrails No phone app RecognisedPhone appDocumentedFree plan 7.0Free Prompt injection defense: YesPII redaction: Yes
- 10 Noma Security No phone app RecognisedPhone appDocumentedFree plan 6.8 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 11 GuardionAI No phone app RecognisedPhone appDocumentedFree plan 6.8 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 12 Sanctum Runtime iPhone + Android RecognisedPhone appDocumentedFree plan 6.7
- 13 Prompt Inspector No phone app RecognisedPhone appDocumentedFree plan 6.5Free Prompt injection defense: Yes
- 14 Straiker Defend AI No phone app RecognisedPhone appDocumentedFree plan 6.4 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 15 VotalAI No phone app RecognisedPhone appDocumentedFree plan 6.3 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 16 ZeroTrusted AI Firewall No phone app RecognisedPhone appDocumentedFree plan 6.3 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 17 SecureAI Guard No phone app RecognisedPhone appDocumentedFree plan 6.2$2,999/mo Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 18 Rocotal No phone app RecognisedPhone appDocumentedFree plan 5.7 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 19 Inferwall No phone app RecognisedPhone appDocumentedFree plan 5.7 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 20 Check Point AI Guardrails No phone app RecognisedPhone appDocumentedFree plan 5.7 Prompt injection defense: YesPII redaction: Yes
- 21 HiddenLayer AI Guardrails No phone app RecognisedPhone appDocumentedFree plan 5.7$416666.67/mo Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 22 Vigil Guard No phone app RecognisedPhone appDocumentedFree plan 5.6 Prompt injection defense: YesPII redaction: YesSecrets detection: Yes
- 23 Cisco Catalyst Center No phone app RecognisedPhone appDocumentedFree plan 5.3
- 24 Microsoft Custom Neural Voice No phone app RecognisedPhone appDocumentedFree plan 5.1
- 25 Prompt Security AI Red Teaming No phone app RecognisedPhone appDocumentedFree plan 4.8
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Prompt injection defense | PII redaction |
|---|---|---|---|---|---|---|---|---|
| 1 | Amazon Bedrock Guardrails | 7.9 | No | $0.07/mo | No | — | Yes | Yes |
| 2 | PromptGuard | 7.8 | Free plan | $19/mo | Yes | — | — | — |
| 3 | WitnessAI | 7.2 | No | — | — | — | Yes | Yes |
| 4 | LLM Guard | 7.1 | No | — | — | — | Yes | Yes |
| 5 | NVIDIA NeMo Guardrails | 7.1 | No | — | — | — | Yes | Yes |
| 6 | GLACIS | 7.1 | Free plan | Free | Yes | — | Yes | Yes |
| 7 | Guardrails AI | 7.0 | No | — | — | — | Yes | Yes |
| 8 | Lasso AI Security Platform | 7.0 | No | — | — | — | Yes | Yes |
| 9 | Openlayer Guardrails | 7.0 | Free plan | Free | Yes | — | Yes | Yes |
| 10 | Noma Security | 6.8 | No | — | — | — | Yes | Yes |
| 11 | GuardionAI | 6.8 | No | — | No | — | Yes | Yes |
| 12 | Sanctum Runtime | 6.7 | No | — | Yes | — | — | — |
| 13 | Prompt Inspector | 6.5 | Free plan | Free | Yes | — | Yes | — |
| 14 | Straiker Defend AI | 6.4 | No | — | — | — | Yes | Yes |
| 15 | VotalAI | 6.3 | No | — | — | — | Yes | Yes |
| 16 | ZeroTrusted AI Firewall | 6.3 | No | — | No | — | Yes | Yes |
| 17 | SecureAI Guard | 6.2 | No | $2,999/mo | No | 2,999 /mo | Yes | Yes |
| 18 | Rocotal | 5.7 | No | — | — | — | Yes | Yes |
| 19 | Inferwall | 5.7 | No | — | — | — | Yes | Yes |
| 20 | Check Point AI Guardrails | 5.7 | No | — | — | — | Yes | Yes |
| 21 | HiddenLayer AI Guardrails | 5.7 | No | $416666.67/mo | — | — | Yes | Yes |
| 22 | Vigil Guard | 5.6 | No | — | — | — | Yes | Yes |
| 23 | Cisco Catalyst Center | 5.3 | No | — | — | — | — | — |
| 24 | Microsoft Custom Neural Voice | 5.1 | No | — | — | — | — | — |
| 25 | Prompt Security AI Red Teaming | 4.8 | No | — | — | — | — | — |
Is your app on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which LLM security tool is ranked first on Samsung Mobile US Press?
Amazon Bedrock Guardrails is ranked #1 of 26 with a score of 7.9. PromptGuard is second and WitnessAI third.
How many of these have a free plan?
4 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, Amazon Bedrock Guardrails has the lowest first paid tier we found: $0.07/mo.
How is this list ranked?
Ranked mobile-first: a phone app alongside the web or desktop product, a free tier and the depth of its documentation. Paid placements never change a rank.