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    5. Klu.ai
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    Added 6/11/2026

    Klu.ai

    Collaborative prompt engineering platform with multi-LLM evaluation and fine-tuning.

    Klu.ai is profiled here as a Prompt Management tool for engineering teams. Read about features, pricing, and how it compares to related options in the tools directory.

    Prompt ManagementTestingPrompt EngineeringLLMRAG FrameworkDeploymentObservabilityEvaluationData IngestionPipeline OrchestrationModel RoutingGuardrailsFree
    Visit WebsiteGitHub

    Description

    Short Intro: Klu.ai is a proprietary LLM application platform founded in 2022 by Stephen M. Walker II, operating from London and San Francisco. The company raised a $1.7M pre-seed in October 2023 from Firstminute Capital, with scout investments from a16z, Sequoia, and Atomico, and angels from Superhuman, IBM, and Productboard. No follow-on funding has been publicly disclosed in the 2.5 years since that round, and CB Insights' Mosaic Score shows a significant decline over the past 30 days. Enterprise buyers evaluating Klu.ai should verify current platform status and vendor stability before committing to a production deployment.

    Key Capabilities:

    • Collaborative Prompt Studio with shared versioning, rollback, and team-level visibility across prompts

    • Unified API for 30+ LLM providers enabling model swapping without rewriting integrations

    • Automated head-to-head A/B evaluation of prompt and model changes against production performance

    • Fine-tuning workflows for OpenAI models, Llama 2, and Mistral using your own data

    • RAG integration for connecting data sources and giving applications custom retrieval context

    • Cost tracking and usage analytics across prompts, chats, and workflows

    • User feedback collection and data labeling for curating fine-tuning datasets

    • Enterprise Container for private cloud or on-premises deployment with SSO and activity logs

    See Klu.ai pricing details →

    Alternative tools

    • Google AI Studio

      Free browser workspace for prototyping with Gemini models

    • Basalt

      Collaborative prompt management and deployment for AI teams

    • Promptmetheus

      Prompt engineering IDE for composing and testing LLM prompts

    • BAML

      A domain-specific language for typed LLM functions

    • Langtail

      Collaborative prompt playground with testing and deployment

    • Lunary

      Open-source prompt management and observability for LLM apps

    Used in Stacks

    No saved stacks include this tool yet.

    Browse more in Prompt Management