LochBot

What is LochBot?

LochBot is a free tool for people building chatbots and other LLM-powered features who want to test a system prompt for prompt injection weaknesses. You paste your system prompt into the page and click Analyze. It then compares the text with 31 known attack patterns, which fall into seven groups: role play jailbreaks, encoding attacks, prompt leaking, direct injection, context manipulation, delimiter attacks and data extraction. Each failed test is rated critical, high, medium or low, and the results roll up into a 0 to 100 security score with an A to F letter grade, plus a specific fix suggestion you can add to the prompt. The report can be exported as JSON for documentation or compliance records. The analysis is client-side pattern matching in your browser, so your prompt is never sent anywhere. It does not run attacks against a real model, so it is a structural first pass and not a replacement for red-team testing. LochBot is free, and the site lists no paid plans.

Use cases

• Check a system prompt for injection weaknesses
• Score prompt security before launch
• Compare the security of two prompt designs
• Get fix suggestions for a vulnerable prompt
• Export a prompt security report as JSON
• Train a team on prompt injection defense

Who it's for

• Developers
• Security engineers
• Product teams
• AI security researchers

Why use LochBot

• Your system prompt never leaves your browser, which matters when the prompt contains internal rules.
• A score and grade make it easy to see how defensible a prompt is and to track improvements.
• Each failed check comes with wording you can paste into the prompt.
• Free to use with no account, so it fits into a quick pre-deployment review.
• The JSON export gives you a record for documentation or compliance reporting.

LochBot features

• Analysis against 31 prompt injection attack patterns
• Seven attack categories from direct injection to prompt leaking
• 0 to 100 security score with an A to F grade
• Severity ratings of critical, high, medium and low
• A specific fix suggestion for every failed test
• JSON export of the full vulnerability report
• Runs entirely in the browser with no API calls or data storage
• Security guides and answers on prompt injection, XSS, CSP and HTTP headers

How to get started with LochBot

1. Open the LochBot scanner page.
2. Paste your chatbot's system prompt into the text area.
3. Click Analyze to run the 31 checks locally in your browser.
4. Review the score, grade and failed tests by category and severity.
5. Apply the suggested fixes, re-run the check, and export the report as JSON if you need a record.

LochBot limitations

• It uses pattern matching and does not test your prompt against a real AI model
• A high score does not guarantee safety against new attacks, and a low score may still work with a well-aligned model
• It is a first-pass structural check, not a substitute for red-team testing

LochBot pricing

LochBot is free to use.

Prices can change and may vary by country or exclude tax. Check the official pricing page.

LochBot alternatives

The main LochBot alternatives listed on Debuly are Promptfoo, Lakera Guard, Agentic Security, Braintrust, ClaudeScope and Fiddler AI. The table compares pricing and platforms; order is A–Z.

1. 

   Agentic Security

   Open-source vulnerability scanner that fuzzes and attacks LLM endpoints and agent workflows, from a pip install or CI check.

   Developer platformsCoding
   Open sourceVisit Agentic Security (official site)
2. 

   Braintrust

   AI observability and evaluation platform for tracing LLM apps and agents, scoring outputs and catching regressions before release.

   Developer platformsCoding
   FreemiumVisit Braintrust (official site)
3. 

   ClaudeScope

   Free, open-source local dashboard that searches every Claude Code session and shows token, cost and cache-savings usage.

   Developer platformsCodingProductivity
   Open sourceVisit ClaudeScope (official site)
4. 

   Fiddler AI

   Control plane for enterprise AI agents: observability, evaluations, inline guardrails and governance for agentic and predictive models.

   Developer platformsAutomation and agents
   FreemiumVisit Fiddler AI (official site)
5. 

   Lakera Guard

   Runtime AI guardrails API that screens LLM and agent traffic for prompt attacks, data leakage and unsafe content, with a free Community tier.

   Developer platformsAutomation and agents
   FreemiumVisit Lakera Guard (official site)
6. 

   Promptfoo

   Open-source LLM evaluation and red-teaming tool that finds prompt injections, jailbreaks and data leaks in AI apps and agents.

   Developer platformsCodingAutomation and agents
   Open sourceVisit Promptfoo (official site)

LochBot FAQ

Sources & verification

Facts on this page come from the official sources below, each with the date we read it. Written by Debuly; the vendor did not review this page.

Image credits

• Logo: from lochbot.com · fetched 24 Oct 2026 · Vendor trademark, used only to identify the product; removed on request
• Cover: none collected yet, so a generated tile is shown.

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