PromptLab
PulseGate's liveness check found it on 3 Oct 2026; it has been in the index since 1 Sep 2026. How this is checked
PromptLab is an open-source Chrome sidepanel extension for testing and evaluating prompt fixtures against OpenAI, Anthropic, and OpenRouter models. It sends requests directly from the browser using user-provided keys, tracks tokens in real time, and avoids telemetry.
Inferred · not functionally tested
Overview
6 featuresPurpose: Testing and comparing LLM prompts without sending data through a telemetry-enabled hosted service.
Inferred · not functionally tested
Audience: developers and prompt engineers
Inferred · not functionally tested
Functions: analytics
Inferred · not functionally tested
Interfaces: API: indicated (inferred, not tested) · MCP: unknown · CLI: indicated (inferred, not tested) · Self-hosting: unknown
Recorded constraints: pricing: open_source · license: Open Source · platforms: CLI, WEB · deployment: browser, cli
Constraint provenance is unknown; confirm requirements with the publisher.
Record sources: github.com. These links do not verify the individual claims.
PromptLab sits in PulseGate's LLM evaluation & benchmarks category. Inferred · not functionally tested: It focuses on testing and comparing LLM prompts without sending data through a telemetry-enabled hosted service. Inferred · not functionally tested: It is built as an open-source project for developers and prompt engineers. Basis unknown · not verified: PromptLab is open source under the Open Source license. Basis unknown · not verified: It ships for the web and the command line.
timgioh builds and maintains PromptLab. Inferred · not functionally tested: Among its 6 catalogued features are prompt fixtures, model testing, and prompt evaluation. Inferred · not functionally tested: Catalogued interfaces include a public API.
Summary written by a language model from the project’s public pages.
Tasks: Inferred · not functionally tested
- Prompt fixtures
- Model testing
- Prompt evaluation
- Token tracking
- BYOK keys
- Direct API requests
Topics: Inferred · not functionally tested
Built with & integrations
Trust & compliance
Indexing history
1What PulseGate has recorded for this listing
- Indexed1 Sep · 11:48 UTCShow HN: PromptLab – Local-first Chrome sidepanel for LLM prompt testing seen via Hacker News firehose (Algolia)Source: Hacker News firehose (Algolia) · Open
Frequently asked questions about PromptLab
- What is PromptLab?
- Inferred · not functionally tested: PromptLab focuses on testing and comparing LLM prompts without sending data through a telemetry-enabled hosted service. It is catalogued under LLM evaluation & benchmarks on PulseGate.
- Who should use PromptLab?
- Inferred · not functionally tested: PromptLab is an open-source project built for developers and prompt engineers.
- Does PromptLab have a free plan?
- Basis unknown · not verified: Yes — PromptLab is open source under the Open Source license and free to use.
- What platforms does PromptLab run on?
- Basis unknown · not verified: PromptLab runs on the web and the command line.
- Is PromptLab still active?
- PulseGate's liveness check found it on 3 Oct 2026.
- What are alternatives to PromptLab?
- Similar projects tracked by PulseGate include PromptLayer, PromptLabHub, and PromptEval.PromptLayerPromptLabHubPromptEval
- Who makes PromptLab?
- PromptLab is developed by timgioh.
- Is PromptLab open source?
- Basis unknown · not verified: Yes — PromptLab is open source under the Open Source license.
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