Best LLM Security Tools in 2026
Updated
In short: Prompt Inspector is ranked #1 of 28 as of 4 October 2026, ahead of PromptGuard and GuardionAI. 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.
Safeguards for language-model applications cover several different concerns. Compare model-abuse detection, output guardrails and prompt injection defense, along with PII redaction and secrets detection. Deployment model can help you assess operational fit; free-plan availability and paid-from pricing add cost context. PromptGuard, GuardionAI and Amazon Bedrock Guardrails are among the tools shown, as are Openlayer Guardrails and WitnessAI. Weigh the protections and deployment choices listed against the risks and operating needs you have in mind, rather than treating any one control as a substitute for the others.
28 LLM security tools ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
28ranked
4free plans on this page
$0.07/molowest paid tier
4 Oct 2026last checked
Input list LLM Security Tools 25 channels on this page · 117 of 200 spec lines stated by the makers
Ch Tool Free planPaid fromPrompt injection defensePII redactionSecrets detectionOutput guardrailsModel-abuse detectionDeployment model Spec sheet Score
01 Prompt Inspector Free planYesPaid fromnot statedPrompt injection defenseYesPII redactionnot statedSecrets detectionnot statedOutput guardrailsnot statedModel-abuse detectionnot statedDeployment modelnot stated 2/8spec lines stated 7.4
02 PromptGuard Free planYesPaid fromnot statedPrompt injection defensenot statedPII redactionnot statedSecrets detectionnot statedOutput guardrailsnot statedModel-abuse detectionnot statedDeployment modelnot stated 1/8spec lines stated 7.3
03 GuardionAI Free planNoPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionYesDeployment modelhybrid 7/8spec lines stated 7.2
04 Amazon Bedrock Guardrails Free planNoPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelcloud 6/8spec lines stated 7.0
05 Openlayer Guardrails Free planYesPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionnot statedOutput guardrailsYesModel-abuse detectionnot statedDeployment modelhybrid 5/8spec lines stated 6.9
06 WitnessAI Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionYesDeployment modelcloud 6/8spec lines stated 6.9
07 GLACIS Free planYesPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionnot statedOutput guardrailsYesModel-abuse detectionnot statedDeployment modelhybrid 5/8spec lines stated 6.8
08 Lasso AI Security Platform Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionYesDeployment modelhybrid 6/8spec lines stated 6.7
09 Sanctum Runtime Free planYesPaid fromnot statedPrompt injection defensenot statedPII redactionnot statedSecrets detectionnot statedOutput guardrailsnot statedModel-abuse detectionnot statedDeployment modelhybrid 2/8spec lines stated 6.6
10 HiddenLayer AI Guardrails Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionYesDeployment modelnot stated 5/8spec lines stated 6.5
11 Prisma AIRS AI Gateway Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelhybrid 5/8spec lines stated 6.5
12 SecureAI Guard Free planNoPaid from$2,999/moPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelhybrid 7/8spec lines stated 6.4
13 ZeroTrusted AI Firewall Free planNoPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionYesDeployment modelhybrid 7/8spec lines stated 6.4
14 Inferwall Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelself-hosted 5/8spec lines stated 6.1
15 Check Point AI Guardrails Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionnot statedOutput guardrailsYesModel-abuse detectionnot statedDeployment modelhybrid 4/8spec lines stated 6.0
16 Microsoft Custom Neural Voice Free plannot statedPaid fromnot statedPrompt injection defensenot statedPII redactionnot statedSecrets detectionnot statedOutput guardrailsnot statedModel-abuse detectionnot statedDeployment modelnot stated 0/8spec lines stated 6.0
17 VotalAI Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelhybrid 5/8spec lines stated 5.9
18 Amazon Nova ReelAmazon Web Services Free planNoPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelcloud 6/8spec lines stated 5.8
19 Cloudflare Advanced Certificate Manager Free planNoPaid from$10/moPrompt injection defensenot statedPII redactionnot statedSecrets detectionnot statedOutput guardrailsnot statedModel-abuse detectionnot statedDeployment modelcloud 3/8spec lines stated 5.8
20 Guardrails AI Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelhybrid 5/8spec lines stated 5.8
21 Noma Security Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionYesDeployment modelhybrid 6/8spec lines stated 5.8
22 Straiker Defend AI Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionYesDeployment modelhybrid 6/8spec lines stated 5.8
23 NVIDIA NeMo Guardrails Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionnot statedOutput guardrailsYesModel-abuse detectionnot statedDeployment modelself-hosted 4/8spec lines stated 5.7
24 Rocotal Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelnot stated 4/8spec lines stated 5.7
25 LLM Guard Free plannot statedPaid fromnot statedPrompt injection defenseYesPII redactionYesSecrets detectionYesOutput guardrailsYesModel-abuse detectionnot statedDeployment modelself-hosted 5/8spec lines stated 5.6
Compare all 25 in a table
| # | Tool | Score | Free plan | From | Free plan | Paid from | Prompt injection defense | PII redaction |
|---|---|---|---|---|---|---|---|---|
| 1 | Prompt Inspector | 7.4 | Free plan | Free | Yes | — | Yes | — |
| 2 | PromptGuard | 7.3 | Free plan | $19/mo | Yes | — | — | — |
| 3 | GuardionAI | 7.2 | No | — | No | — | Yes | Yes |
| 4 | Amazon Bedrock Guardrails | 7.0 | No | $0.07/mo | No | — | Yes | Yes |
| 5 | Openlayer Guardrails | 6.9 | Free plan | Free | Yes | — | Yes | Yes |
| 6 | WitnessAI | 6.9 | No | — | — | — | Yes | Yes |
| 7 | GLACIS | 6.8 | Free plan | Free | Yes | — | Yes | Yes |
| 8 | Lasso AI Security Platform | 6.7 | No | — | — | — | Yes | Yes |
| 9 | Sanctum Runtime | 6.6 | No | — | Yes | — | — | — |
| 10 | HiddenLayer AI Guardrails | 6.5 | No | $416666.67/mo | — | — | Yes | Yes |
| 11 | Prisma AIRS AI Gateway | 6.5 | No | — | — | — | Yes | Yes |
| 12 | SecureAI Guard | 6.4 | No | $2,999/mo | No | 2,999 /mo | Yes | Yes |
| 13 | ZeroTrusted AI Firewall | 6.4 | No | — | No | — | Yes | Yes |
| 14 | Inferwall | 6.1 | No | — | — | — | Yes | Yes |
| 15 | Check Point AI Guardrails | 6.0 | No | — | — | — | Yes | Yes |
| 16 | Microsoft Custom Neural Voice | 6.0 | No | — | — | — | — | — |
| 17 | VotalAI | 5.9 | No | — | — | — | Yes | Yes |
| 18 | Amazon Nova Reel | 5.8 | No | — | No | — | Yes | Yes |
| 19 | Cloudflare Advanced Certificate Manager | 5.8 | No | $10/mo | No | 10 /mo | — | — |
| 20 | Guardrails AI | 5.8 | No | — | — | — | Yes | Yes |
| 21 | Noma Security | 5.8 | No | — | — | — | Yes | Yes |
| 22 | Straiker Defend AI | 5.8 | No | — | — | — | Yes | Yes |
| 23 | NVIDIA NeMo Guardrails | 5.7 | No | — | — | — | Yes | Yes |
| 24 | Rocotal | 5.7 | No | — | — | — | Yes | Yes |
| 25 | LLM Guard | 5.6 | No | — | — | — | Yes | Yes |
Is your tool 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 Specifiction?
Prompt Inspector is ranked #1 of 28 with a score of 7.4. PromptGuard is second and GuardionAI 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 on what each maker publishes, the fullest spec sheet first: how deeply the product is documented, the platforms it runs on, a free tier or trial to test it, and its standing. Paid placements never change a rank.
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