Shortlist by what you need
Start here if you know why you are leaving Prompt Security.
Want the closest match?
CalypsoAIMost similar to Prompt Security in what it does, its category and its price.
Visit (opens CalypsoAI in a new tab)Need a free plan?
LakeraHas a free plan, rated 4.3 out of 5. Prompt Security has none.
Visit (opens Lakera in a new tab)Want the best rated?
Dynamo AIRated 4.3 out of 5 in our review, against 4.1 for Prompt Security.
Visit (opens Dynamo AI in a new tab)
At a glance
Green means better than Prompt Security, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 Prompt SecurityBaseline | 4.1 | Not listed | No | AI security platform covering prompt injection, data leakage and shadow AI use | |
| CalypsoAI | 4.1Same | Not listed | No | AI guardrails, now part of F5, protecting generative AI applications in production. | vs Prompt Security |
 Enkrypt AI | 4.1Same | Not listed | No | Security and safety testing for AI systems, covering threat detection and ongoing monitoring. | vs Prompt Security |
| Lakera | 4.3+0.2 | Free | YesPrompt Security has none | Real-time API that blocks prompt injection, jailbreaks, and data leakage in LLM applications. | vs Prompt Security |
 Adversa | 4.2+0.1 | Not listed | No | AI red-teaming platform that runs continuous attack simulations against LLMs, agents, and GenAI applications to surface security gaps. | vs Prompt Security |
 Traceable | 4.1Same | Not listed | No | Discovers every API you have, tests them in the pipeline, and blocks attacks at runtime. | vs Prompt Security |
 Levo.ai | 3.7−0.4 | Not listed | No | Runtime security for both traditional APIs and AI-native apps - discovers, red-teams, and firewalls your AI agents, LLMs, and MCP servers, not just your endpoints. | vs Prompt Security |
 DeepKeep | 4.0−0.1 | Not listed | No | AI-native security platform that firewalls, red-teams, and scans LLMs and computer-vision models against adversarial threats. | vs Prompt Security |
| Dynamo AI | 4.3+0.2 | Not listed | No | Enterprise AI security and compliance platform that evaluates, red-teams, and applies guardrails to generative models before and after deployment. | vs Prompt Security |
The alternatives in detail
In order of how closely each one matches Prompt Security.
CalypsoAI
4.1Not listed
vs Prompt SecuritySame
AI guardrails, now part of F5, protecting generative AI applications in production.
- Runtime guardrails between the model and the user
- Protection against prompt injection and data leakage
- Policy enforcement across cloud deployments
Backed by an established security vendor rather than a startup
Enterprise procurement through F5 rather than self-serve
Enkrypt AI
4.1Not listed
vs Prompt SecuritySame
Security and safety testing for AI systems, covering threat detection and ongoing monitoring.
- Security and safety testing specific to AI systems
- Detection of prompt injection, jailbreaks and harmful output
- Vulnerability remediation rather than reporting alone
Addresses failure modes conventional application security misses
Only relevant to organisations actually deploying AI systems
Lakera
4.3Free
vs Prompt Security+0.2Free plan
Real-time API that blocks prompt injection, jailbreaks, and data leakage in LLM applications.
- Real-time prompt injection and jailbreak detection API
- Automated red-teaming through Lakera Red
- Sensitive-data leakage screening on model outputs
Free Community tier gives developers a real way to test the product before buying
Paid tier pricing is no longer public and now runs through Check Point's enterprise sales process
Adversa
4.2Not listed
vs Prompt Security+0.1
AI red-teaming platform that runs continuous attack simulations against LLMs, agents, and GenAI applications to surface security gaps.
- Continuous automated red-teaming for GenAI apps and autonomous agents
- Coverage of MCP-based agent stacks, not only chatbot interfaces
- Simulated prompt-injection, jailbreak, and data-exfiltration attacks
Focused specifically on agentic AI attack surfaces newer security tools miss
No published pricing, requires direct contact to scope an engagement
Traceable
4.1Not listed
vs Prompt SecuritySame
Discovers every API you have, tests them in the pipeline, and blocks attacks at runtime.
- Continuous API discovery and risk assessment
- Security testing inside the development lifecycle
- Runtime protection against live attacks
Finds the shadow APIs that inventories miss
No published pricing
Levo.ai
3.7Not listed
vs Prompt Security−0.4
Runtime security for both traditional APIs and AI-native apps - discovers, red-teams, and firewalls your AI agents, LLMs, and MCP servers, not just your endpoints.
- Runtime visibility into AI agents, LLMs, and MCP servers
- AI red-teaming and threat detection
- Prompt-injection and tool-abuse prevention (AI gateway/firewall)
Covers both traditional API security and AI-specific runtime risk in one platform
No published pricing - requires a demo or sign-up request
DeepKeep
4.0Not listed
vs Prompt Security−0.1
AI-native security platform that firewalls, red-teams, and scans LLMs and computer-vision models against adversarial threats.
- AI Firewall that inspects prompts and outputs for injection and leakage attempts
- Automated AI red teaming that probes models for jailbreaks before deployment
- Model scanning for vulnerabilities across LLM and computer-vision systems
Covers both LLMs and computer-vision models, a wider scope than most LLM-only security tools
No published pricing, so budgeting requires a sales conversation up front
Dynamo AI
4.3Not listed
vs Prompt Security+0.2
Enterprise AI security and compliance platform that evaluates, red-teams, and applies guardrails to generative models before and after deployment.
- DynamoEval automated red-teaming across 20+ privacy and safety tests
- DynamoEnhance targeted risk remediation for flagged model behavior
- DynamoGuard real-time production guardrails against jailbreaks and prompt injection
Full-lifecycle coverage from pre-deployment testing through live guardrails in one suite
No published pricing means budgeting requires a sales conversation before evaluation
FAQ
Questions people ask
Is Prompt Security free?
Prompt Security does not list a free plan. Check its pricing page for current plans.
What is the best free alternative to Prompt Security?
Lakera is the highest-rated alternative here with a free plan (4.3 out of 5).
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.