Developer Tools

Glassbrain

Visual debugging tool for AI applications — see your AI's reasoning chain, find bugs, and fix them with one click.

glassbrain.dev

Verified API available Free tier

Quick facts
What is it	Visual debugging tool for AI applications — see your AI's reasoning chain, find bugs, and fix them with one click.
Pricing	Freemium — from $39/mo
Free tier	Yes
Platform	Web Application
API	Yes
Best for	Debugging incorrect AI responses in production, Identifying root causes of AI workflow failures
Domain registered	2026

Data updated Aug. 1, 2026

What does Glassbrain do?

Glassbrain is a visual debugging tool specifically designed for AI-powered applications. It captures every step of your AI's reasoning process—from user input through retrieval and LLM calls to final output—and displays it as an interactive trace tree. When your AI gives a wrong answer or fails, you can visually navigate through the execution path, inspect data at each step, and quickly identify where things went wrong without parsing through thousands of lines of log files.

The tool works by integrating with popular AI frameworks including OpenAI, Anthropic, LangChain, and LlamaIndex, plus any custom stack via OpenTelemetry. Its standout feature is time-travel replay, which allows you to click on any node in the trace, modify the input data, and replay the execution from that point forward to test fixes without redeploying your application. Glassbrain also provides AI-powered fix suggestions that analyze the trace and offer concrete recommendations for resolving the issue.

Glassbrain is particularly valuable for developers and ML engineers building AI applications that need reliable debugging capabilities. It helps teams quickly resolve production issues like incorrect chatbot responses, API rate limit errors, or performance bottlenecks. The free tier includes 1,000 traces per month, making it accessible for small projects, while paid plans scale to support enterprise teams with higher volumes and additional collaboration features.

Bug Reports Developer Tools LLM Testing

#ai debugging#developer tools#error diagnosis#llm ops#visual-tracing#workflow-replay

Key features

What makes it stand out

Visual trace tree shows your AI's entire reasoning chain as an interactive, clickable tree

Time-travel replay lets you click any node, change inputs, and replay from that point without redeploying

AI fix suggestions provide concrete proposals powered by Claude to resolve issues

Diff view shows side-by-side before and after comparisons to verify improvements

Shareable links let you generate URLs for any debugging session to collaborate with your team

Who is Glassbrain for?

Who benefits most from this tool

Debugging incorrect AI responses in production

Identifying root causes of AI workflow failures

Optimizing AI application performance and latency

Pricing

Free tier available — start without a credit card

Free

1,000 traces
5 replays
1 projects
24 hours retention
10 AI fix suggestions
5 before after comparisons
Visual trace tree
Time-travel replay
AI fix suggestions
Before/after comparison
OpenAI + Anthropic SDKs

Pro

$39.0/month

50,000 traces
5 projects
30 days retention
Unlimited replays
Unlimited AI fix suggestions
Unlimited before/after comparisons
All SDK integrations + OpenTelemetry
Slack + Discord alerts

Team

$149.0/month

Everything in Pro, plus:

200,000 traces
10 projects
60 days retention
5 team members
Shareable replay links
Team collaboration

Business

Custom

Everything in Team, plus:

500,000 traces
Unlimited projects
90 days retention
15 team members
CI/CD integration
SSO
Priority support

Trust & presence

Domain Domain registered 2026

Gallery

Click any image to enlarge

Glassbrain — pricing page — Pricing page

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