{"id":13382,"date":"2026-05-22T20:19:41","date_gmt":"2026-05-22T20:19:41","guid":{"rendered":"https:\/\/comparateur-ia.io\/outils-ia\/langfuse\/"},"modified":"2026-05-22T20:19:41","modified_gmt":"2026-05-22T20:19:41","slug":"langfuse","status":"publish","type":"outil_ia","link":"https:\/\/comparateur-ia.io\/en\/outils-ia\/langfuse\/","title":{"rendered":"Langfuse"},"content":{"rendered":"\n\n<p class=\"tool-description\">Langfuse is an open source LLM engineering platform that enables teams to develop, debug, and improve their AI applications in production. It rests on four complementary modules: observability (complete tracing of LLMs and agents via OpenTelemetry), prompt management (versioning, playground, experiments), evaluation (LLM-as-judge, human annotation, datasets, regression tests), and metrics (costs, latencies, user feedback). Compatible with Python, JavaScript, Java, and Go, Langfuse integrates natively with LangChain, LlamaIndex, LiteLLM, OpenAI, and dozens of other frameworks. Fully self-hostable on any infrastructure, certified SOC 2 Type II and ISO 27001, the platform is used by Khan Academy, Twilio, Merck, and thousands of teams worldwide.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">What is Langfuse?<\/h2>\n\n\n\n\n\n<p>Langfuse is an open source LLM engineering platform that covers the entire lifecycle of an AI application in production. It is structured around four main modules: observability (complete tracing of LLM calls and agent workflows), prompt management (versioning, playground, experiments), evaluation (automated and human evaluations, datasets, regression tests), and metrics (costs, latencies, user feedback, usage). The platform is based on the OpenTelemetry standard and integrates natively with major LLM frameworks on the market.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Key Features<\/h2>\n\n\n\n\n\n<p>Langfuse groups four complementary modules. Observability captures complete traces of each LLM call and each agent workflow, with native support for Python, JavaScript, Java, and Go. It allows tracking conversation sessions, individual users, tokens, and costs per request. The prompt management module offers versioning, release management, composability (nested prompts), server and client-side caching, an interactive playground, and A\/B experiments. The evaluation module provides configurable LLM-as-judge evaluators, human annotation with review queues, dataset management for regression tests, experiments via SDK and UI, and external evaluation pipelines. Finally, metrics provide dashboards on costs, latency, quality, and usage by feature, with integrations to PostHog and Mixpanel.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Use Cases<\/h2>\n\n\n\n\n\n<p>Langfuse adapts to many concrete use cases. For production debugging, teams quickly identify problematic traces by filtering on latency, cost, or quality score. For continuous prompt improvement, teams iterate on versions with A\/B experiments anchored on historical test datasets. For chatbots and assistants, Langfuse traces complete sessions and enables analyzing problematic conversations. For complex agent workflows, it visualizes execution graphs with each tool call and decision traced. For regulated sectors like healthcare and finance, it provides necessary compliance with data stored in Europe or the United States.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Advantages<\/h2>\n\n\n\n\n\n<p>Langfuse provides several decisive advantages. The open source nature guarantees freedom from vendor lock-in and enables auditing the code in full transparency. Self-hosting offers complete data control, essential for organizations with strict sovereignty requirements. OpenTelemetry compliance facilitates integration into existing technical stacks and avoids costly migrations. The combination of observability + evaluations + prompt management in a single platform eliminates the need to manage multiple tools. The generous free plan allows startups and open source projects to start without budget constraints.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Pricing<\/h2>\n\n\n\n\n\n<p>Langfuse offers four pricing tiers. The Hobby plan is free with 50,000 units\/month, 30-day retention, and 2 users, without a credit card. The Core plan at $29\/month scales to 100,000 units\/month, 90-day retention, and unlimited users. The Pro plan at $199\/month offers 3 years retention, very high request rates, and SOC 2\/HIPAA compliance. The Enterprise plan at $2,499\/month targets large organizations with custom limits, dedicated SLA, and priority support. Self-hosting is available free for all plans with open source code.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n\n\n<p>Langfuse is today the most comprehensive and widely adopted open source LLM engineering platform. Its combination of observability, evaluations, and prompt management in a single self-hostable solution makes it the strategic choice for any team taking the quality of their production LLM applications seriously. The free plan lets you start immediately, and advanced compliance meets the needs of the most regulated sectors.<\/p>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Strengths<\/h2>\n\n\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><strong>Open source<\/strong> with 23K+ GitHub stars and unlimited self-hosting<\/li>\n\n<li><strong>Complete observability<\/strong> based on OpenTelemetry for LLMs and agents<\/li>\n\n<li><strong>Multi-mode evaluations<\/strong>: LLM-as-judge, human annotation, and datasets<\/li>\n\n<li><strong>Prompt management<\/strong> with versioning, playground, and A\/B experiments<\/li>\n\n<li><strong>Generous free plan<\/strong>: 50K units\/month without credit card required<\/li>\n\n<li><strong>SOC 2 Type II and ISO 27001<\/strong> with HIPAA available on advanced plans<\/li>\n\n<\/ul>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">Limitations<\/h2>\n\n\n\n\n\n<ul class=\"wp-block-list\">\n\n<li><strong>Exclusively technical tool<\/strong>: requires development skills<\/li>\n\n<li><strong>Interface in English only<\/strong> without localized version available<\/li>\n\n<li><strong>Data retention limited to 30 days<\/strong> on the free Hobby plan<\/li>\n\n<li><strong>Self-hosting<\/strong> requires infrastructure and DevOps expertise<\/li>\n\n<\/ul>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">FAQ<\/h2>\n\n\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Is Langfuse truly open source?<\/summary>\n\n\n\n<p>Yes, Langfuse is fully open source (MIT license) with code available on GitHub (23K+ stars). It can be self-hosted free on any infrastructure without feature restrictions.<\/p>\n\n\n\n<\/details>\n\n\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Is Langfuse free?<\/summary>\n\n\n\n<p>Yes, Langfuse offers a free Hobby plan with 50,000 units\/month, 30-day data retention, and up to 2 users without credit card. Paid plans start at $29\/month (Core) for production projects.<\/p>\n\n\n\n<\/details>\n\n\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Which frameworks and LLM models is it compatible with?<\/summary>\n\n\n\n<p>Langfuse integrates natively with LangChain, LlamaIndex, LiteLLM, OpenAI, Anthropic, Mistral, and dozens of others. It supports Python, JavaScript, Java, and Go via dedicated SDKs and the OpenTelemetry standard.<\/p>\n\n\n\n<\/details>\n\n\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Can Langfuse be hosted on your own infrastructure?<\/summary>\n\n\n\n<p>Yes, Langfuse can be deployed in self-hosting on any infrastructure (Docker, Kubernetes, AWS, GCP, Azure) at no additional cost. Detailed deployment guides are available in the official documentation.<\/p>\n\n\n\n<\/details>\n\n\n\n\n\n<details class=\"wp-block-details is-layout-flow wp-block-details-is-layout-flow\"><summary>Is Langfuse compliant with GDPR and HIPAA regulations?<\/summary>\n\n\n\n<p>Yes, Langfuse is certified SOC 2 Type II and ISO 27001. HIPAA compliance with BAA is available on Pro and Enterprise plans. Data can be hosted in the US or EU. Self-hosting provides complete control over data location.<\/p>\n\n\n\n<\/details>\n\n","protected":false},"excerpt":{"rendered":"<p>Open source LLM engineering platform: observability, evaluations, prompt management, and metrics to debug and improve your AI applications in production.<\/p>\n","protected":false},"author":3,"featured_media":963,"template":"single-outil_ia","meta":{"cia_url_outil":"https:\/\/langfuse.com","cia_affiliate_url":"","cia_prix":"Free \/ From $29\/month","cia_devise":"USD","cia_date_test":"","cia_highlight":"Trace, evaluate, and optimize your LLM applications in production \u2014 open source, self-hostable, used by Khan Academy and Twilio.","cia_logo":"\/partners\/langfuse.png","cia_og_image":"","cia_partner":"langfuse","cia_json_id":"langfuse","cia_verdict":"Langfuse has quickly established itself as the leading open source reference for LLM observability and engineering. With over 23,000 GitHub stars and adoption by organizations as diverse as Khan Academy, Twilio, Merck, and thousands of startups, the platform has clearly found its market. Its positioning is unique: where most LLM observability solutions are proprietary and expensive, Langfuse offers a complete alternative that is both open source and can be hosted on any infrastructure at no licensing cost. The platform's four modules \u2014 observability, evaluations, prompt management, and metrics \u2014 cover the entire lifecycle of an LLM application in production. The observability built on OpenTelemetry is particularly well-designed, supporting not just Python and JavaScript but also Java and Go via open standards. Multi-mode evaluations (automated LLM-as-judge, human annotation with review queues, datasets, regression tests) enable objectively measuring LLM output quality. Integrated prompt management with versioning, playground, and A\/B experiments avoids having to manage a separate tool for this function. The free Hobby plan is generous for getting started without a credit card required. The Core plan at $29\/month is very competitive for production projects. SOC 2 Type II, ISO 27001, and HIPAA compliance reassures teams working in regulated sectors. The main limitations concern the target user profile: Langfuse is exclusively for developers and technical teams. The interface is in English only, and self-hosting setup requires DevOps expertise. For any team serious about developing LLM applications in production, Langfuse is today the benchmark choice in the open source ecosystem.","cia_avantages":"[\"Open source with 23K+ GitHub stars and unlimited self-hosting\",\"Complete observability based on OpenTelemetry for LLMs and agents\",\"Multi-mode evaluations: LLM-as-judge, human annotation, and datasets\",\"Prompt management with versioning, playground, and A\/B experiments\",\"Generous free plan: 50K units\/month without credit card required\",\"SOC 2 Type II and ISO 27001 with HIPAA available on advanced plans\"]","cia_avantages_court":"[\"Open source, 23K+ GitHub stars\",\"Observabilit\u00e9 OpenTelemetry compl\u00e8te\",\"\u00c9valuations LLM-as-judge + humaines\",\"Gestion de prompts avec A\/B testing\",\"Plan gratuit sans carte bancaire\"]","cia_inconvenients":"[\"Exclusively technical tool: requires development skills\",\"Interface in English only without localized version available\",\"Data retention limited to 30 days on the free Hobby plan\",\"Self-hosting requires infrastructure and DevOps expertise\"]","cia_inconvenients_court":"[\"Outil exclusivement technique\",\"Interface en anglais uniquement\",\"30 jours de donn\u00e9es sur plan gratuit\",\"Self-hosting n\u00e9cessite expertise DevOps\"]","cia_ideal_pour":"[\"\u00c9quipes d'ing\u00e9nierie LLM cherchant une solution open source compl\u00e8te\",\"Startups IA voulant une observabilit\u00e9 production d\u00e8s le premier jour\",\"Organisations r\u00e9glement\u00e9es n\u00e9cessitant SOC 2 \/ HIPAA \/ ISO 27001\",\"D\u00e9veloppeurs Python et JS int\u00e9grant LangChain, OpenAI ou LiteLLM\"]","cia_pas_pour":"[\"Utilisateurs non techniques sans comp\u00e9tences en d\u00e9veloppement API\",\"\u00c9quipes cherchant un outil no-code de gestion de prompts uniquement\",\"Projets sans LLMs en production ou en phase purement exploratoire\",\"Utilisateurs cherchant une interface en fran\u00e7ais ou un support multilingue\"]","cia_faq":"[{\"q\":\"Is Langfuse truly open source?\",\"a\":\"Yes, Langfuse is fully open source (MIT license) with code available on GitHub (23K+ stars). It can be self-hosted free on any infrastructure without feature restrictions.\"},{\"q\":\"Is Langfuse free?\",\"a\":\"Yes, Langfuse offers a free Hobby plan with 50,000 units\/month, 30-day data retention, and up to 2 users without credit card. Paid plans start at $29\/month (Core) for production projects.\"},{\"q\":\"Which frameworks and LLM models is it compatible with?\",\"a\":\"Langfuse integrates natively with LangChain, LlamaIndex, LiteLLM, OpenAI, Anthropic, Mistral, and dozens of others. It supports Python, JavaScript, Java, and Go via dedicated SDKs and the OpenTelemetry standard.\"},{\"q\":\"Can Langfuse be hosted on your own infrastructure?\",\"a\":\"Yes, Langfuse can be deployed in self-hosting on any infrastructure (Docker, Kubernetes, AWS, GCP, Azure) at no additional cost. Detailed deployment guides are available in the official documentation.\"},{\"q\":\"Is Langfuse compliant with GDPR and HIPAA regulations?\",\"a\":\"Yes, Langfuse is certified SOC 2 Type II and ISO 27001. HIPAA compliance with BAA is available on Pro and Enterprise plans. Data can be hosted in the US or EU. Self-hosting provides complete control over data location.\"}]","cia_languages":"[\"en\"]","cia_read_more":"[{\"href\":\"\/comparatifs\/ia-code-developpement\",\"title\":\"Les meilleures IA pour le code et le d\u00e9veloppement\",\"desc\":\"Comparez les outils IA d\u00e9di\u00e9s aux \u00e9quipes d'ing\u00e9nierie et d\u00e9veloppeurs.\"},{\"href\":\"\/comparatifs\/ia-data-analytics\",\"title\":\"Les meilleures IA data et analytics\",\"desc\":\"D\u00e9couvrez les outils IA pour analyser, monitorer et visualiser vos donn\u00e9es.\"}]","cia_seo_title":"","cia_seo_description":"","cia_seo_h1":"","cia_review_seo_title":"","cia_review_seo_desc":"","cia_created_at":"2026-03-15","cia_updated_at":"2026-03-15","cia_note_globale":4.8,"cia_note_count":72,"cia_prix_mensuel":29,"cia_ranking":999,"cia_verified":false,"cia_featured":false,"cia_selection":false,"cia_is_affiliate":false,"cia_has_review":true,"cia_trial":true,"cia_langue_fr":false,"cia_api_disponible":false,"footnotes":""},"categorie-ia":[177,256],"tag-ia":[102,208,179,114],"tarification":[17,15,16],"niveau-utilisateur":[],"metier":[],"class_list":["post-13382","outil_ia","type-outil_ia","status-publish","has-post-thumbnail","hentry","categorie_ia-code-development","categorie_ia-data-analytics-en","tag_ia-debug-review","tag_ia-integrations-apis","tag_ia-open-source","tag_ia-tests-automatises","tarification-essai-gratuit","tarification-freemium","tarification-payant"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - 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