ExtSpot
litmus — System Prompt Tester icon

litmus Chrome Extension Analysis

Developer & Designer Tools

Store listing title: litmus — System Prompt Tester

Chrome extension ID: djkioeiacfngjlmfpdlpmgiamdnhpeje

litmus is a browser-based system prompt tester that allows developers to analyze and version prompts across various LLM providers. It supports output quality scoring via rubrics and behavioral testing for AI agents and tool calls using a BYOK (Bring Your Own Key) model.

Developer:Sharaj
Version:1.6
Size:141KiB
Last updated:
View developer profile
External:Chrome Web StoreOfficial website

Overview

Installs

0

Rating

★ —

0 reviews

Languages

1 locales

Includes English (United States)

Market analysis

Review-backed positioning, friction, and market signals for this Chrome extension.

No review samples found

Macro category

Developer & Designer Tools

Pricing friction

Low review signal

Complaint intensity

Low review signal

Listing & review signals
Observed signals from store listing text and review samples.

Listing positioning

The product is positioned as a local-first, privacy-centric utility that converts prompt engineering from a 'gut feeling' into measured results. It focuses on rigor through LLM-as-judge rubrics and deterministic tool-calling validation.

Inferred product pattern

BYOK local-first developer utility for LLM prompt evaluation.

Review-backed pain points

Review-backed data is not available.

Observed feature gaps

No reviews available to identify user-reported gaps; listing claims comprehensive local evaluation features.

Tags
Prompt EngineeringLLM TestingAI Developer ToolsSystem PromptsAgent Testing
Target users

- Prompt Engineers

- AI App Developers

- LLM Researchers

Primary use cases

- Testing system prompt output quality

- Validating LLM tool-calling arguments

- Evaluating AI agent trajectory and recovery

- Versioning and comparing prompt iterations

Positive themes

No positive theme data.

Negative themes

No negative theme data.

Observed friction

- No pricing friction observed as the tool is local-first and requires users to provide their own API keys.

Evidence boundary: Analysis based entirely on the provided Chrome Web Store listing data. No user reviews were available to verify product performance or user satisfaction.
Complaint summaries
Review-backed complaint signals grouped by operational area.

Support

Review-backed data is not available.

Reliability

Review-backed data is not available.

Privacy

No complaints found; listing explicitly claims no backend, no account, and no tracking.

Access & pricing

- Free usage observed

- No account requirement observed

- Free plan or free usage claimed

Store listing facts

Listing assets

- Screenshots: 4

- Videos: 0

- Languages: 1

Trust signals

- Privacy policy

- Developer contact

- Official website

Store metadata

- Version: 1.6

- Size: 141KiB

- Last updated:

Listing SEO keywords

Search intent keywords
Keyword signals for evaluating how users may discover, compare, or search for this extension category.

Core discovery

System Prompt TesterLLM Evaluation ToolPrompt Engineering UtilityAI Agent Testing

Comparison

litmus vs promptfoobest system prompt testerlocal LLM eval tool

Problem

how to test system promptsLLM tool calling validationprompt drift testing

Alternative

prompt testing alternativeLLM judge toolagent behavior tester

Similar extensions

Jump to related discovery paths:

More in developerMore from this developer

Screenshots

litmus — System Prompt Tester screenshot
litmus — System Prompt Tester screenshot
litmus — System Prompt Tester screenshot
litmus — System Prompt Tester screenshot

Links

Website: sharaj.pages.dev

Privacy policy: https://raw.githubusercontent.com/srewoo/litmus/refs/heads/main/app/public/privacypolicy.html

Recommended Chrome extensions

Related listings from the same category, trending peers, and the same publisher portfolio.

Browse developer
QAtalyst - AI Test Case Generator icon

QAtalyst - AI Test Case Generator

Sharaj

AI test case generator for Jira. Turn tickets, requirements & acceptance criteria into positive, negative & edge-case tests.

Installs

51

Rating

★ —

XHRScribe - AI API Test Generator icon

XHRScribe - AI API Test Generator

Sharaj

Generate API tests from network traffic. Capture XHR, Fetch & GraphQL and export Jest, Playwright, Cypress & Postman tests.

Installs

19

Rating

★ —

Tag Assistant icon

Tag Assistant

Google

The Tag Assistant extension works with Tag Assistant to help troubleshoot installation of gtag.js and Google Tag Manager.

Installs

3.0M+

Rating

★ 3.9

Wappalyzer - Technology profiler icon

Wappalyzer - Technology profiler

Wappalyzer

Identify web technologies

Installs

3.0M+

Rating

★ 4.6

Meta Ads Data Advisor icon

Meta Ads Data Advisor

Meta

Meta Ads Data Advisor automates connecting your website and marketing data to Meta for better ad performance. No developers needed.

Installs

3.0M+

Rating

★ 3.9

Take Webpage Screenshots Entirely - FireShot icon

Take Webpage Screenshots Entirely - FireShot

Evgeny Vokilsus

Take FULL webpage screenshots. Capture, edit and save them to PDF/JPEG/GIF/PNG, upload, print, send to OneNote, clipboard or email.

Installs

3.0M+

Rating

★ 4.8

JSON Formatter icon

JSON Formatter

Code Formatter

Makes JSON easy to read

Installs

2.0M+

Rating

★ 4.3

WhatFont icon

WhatFont

Chengyin Liu

The easiest way to identify fonts on web pages.

Installs

2.0M+

Rating

★ 4.0

Cookie-Editor icon

Cookie-Editor

cgagnier

Simple yet powerful Cookie Editor that allow you to quickly create, edit and delete cookies without leaving your tab.

Installs

2.0M+

Rating

★ 4.4

Chromebook Recovery Utility icon

Chromebook Recovery Utility

google.com

Create recovery media for your Chromebook.

Installs

2.0M+

Rating

★ 2.6