Best Free Langfuse Alternatives
25 alternatives to Langfuse with a free plan or free tier, ranked by how closely they match. The percentage is a match score, not a popularity score.
Replacing: Langfuse — Langfuse is an open-source platform for observability and evaluation of AI agents and LLM Input: text, data · Output: data
1
Arize Phoenix is an open-source platform for AI observability and evaluation, built by Arize.
Input: text, data · Output: data
Free planFrom $50/moAPITeams
100%Near drop-in replacement · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals25/25
- Feature description similarity20/20
Shared goals 2 of the 2 we tag Langfuse for
MonitoringSoftware Development
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
2
Helicone is an AI gateway and LLM observability platform that routes, debugs and analyzes requests from AI applications.
Input: data · Output: data
Free planFrom $79/moAPITeams
97%Near drop-in replacement · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals25/25
- Feature description similarity17/20
Shared goals 2 of the 2 we tag Langfuse for
MonitoringSoftware Development
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
3
Datadog is a cloud-scale observability and security service that brings infrastructure metrics, application traces, logs, security signals and user experience data into one place.
Input: data, code · Output: data
Free planFrom $15/moAPIMobile appTeams
94%Near drop-in replacement · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals25/25
- Feature description similarity14/20
Shared goals 2 of the 2 we tag Langfuse for
MonitoringSoftware Development
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
4
New Relic AI is a generative assistant built into the New Relic observability platform that lets people ask questions about their systems in everyday language.
Input: text, data, code · Output: text, code
Free planTeams
89%Strong alternative · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals25/25
- Feature description similarity9/20
Shared goals 2 of the 2 we tag Langfuse for
MonitoringSoftware Development
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
5
Cisco AI Canvas creates a unified workspace where IT operations teams handle incidents across networking, security, collaboration, and observability domains simultaneously
Input: text, data · Output: text, data
Free planTeams
75%Strong alternative · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity5/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
AI Agents
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
6
77%Strong alternative · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity7/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
7
Voice-native AI sounds impressive—until you learn most vendors transcribe audio to text first, then analyze
Input: audio · Output: text, data
Free planFrom $30,000/mo
73%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity3/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
Transcription
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
8
73%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity2/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
API Integration
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
9
TAAFT deploys AI agents called Scouts that crawl the web looking for whatever you tell them to find
Input: text · Output: text
Free planAPI
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
AI AgentsResearch
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
10
The Monitor API is a tool designed for continuous tracking of web changes relevant to a user-defined
Input: text · Output: data
Free planFrom $9.99/mo
73%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity2/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
API Integration
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
11
72%Partial replacement — covers the main need with gaps
00
How the score adds up
- Each lists the other's core category39/55
- Covers Langfuse's goals19/25
- Feature description similarity15/20
Shared goals 2 of the 2 we tag Langfuse for
MonitoringSoftware Development
Also tagged for
API Integration
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
12
An SEO manager notices traffic dropping despite strong Google rankings
Input: text, web pages · Output: text, data
Free planFrom $89/moAPITeams
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
13
TAAFT, operating as NBot AI, monitors content across news sites, newsletters, RSS feeds, blogs, YouTube, X, Reddit, and websites to surface information matching user-defined interests
Input: text, web pages · Output: text
Free plan
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
News
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
14
See how much traffic AI chatbots actually send you
Input: web pages · Output: documents, data
Free planFrom $29/mo
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
15
When you open Geneo, you're tracking something most brands don't even know exists yet: how often AI search tools mention them
Input: text · Output: text, data
Free planFrom $39/moTeams
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity2/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
16
71%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
17
KNWN tracks how brands show up when people ask AI assistants questions
Input: text, web pages · Output: text, data
Free planFrom $49/moTeams
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
18
Most companies track where they rank on Google
Input: text · Output: data
Free planFrom $99/mo
71%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
19
Traditional monitoring tools won't tell you how often AI assistants mention your brand
Input: text, web pages · Output: data
Free planFrom $69/mo
71%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
20
Your brand could be mentioned thousands of times in AI search results and you'd never know
Input: web pages · Output: text, data
Free planFrom $149/moTeams
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
21
After connecting your existing security cameras to the system, you are looking at three AI agents that run independently
Input: text, video · Output: text, audio
Free plan
71%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
Image Recognition
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
22
AI tools don't know when you're about to paste your social security number into them
Input: text, audio, video, documents · Output: text
Free planFrom $590/mo
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
AI Agents
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
23
Monitoring thousands of news outlets used to require hiring an entire team
Input: text · Output: documents, data
Free planFrom $199/mo
71%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity1/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
Social Media
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
24
Agent Charley runs a small language model directly in your browser to catch phishing attempts before you click
Input: text, web pages · Output: text
Free planBrowser extensionTeams
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity2/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
25
AI Visibility Rank checks how AI models rank your company when someone asks a buying question.
Input: text, web pages · Output: data
Free planFrom $5/mo
72%Partial replacement — covers the main need with gaps · same core category as Langfuse
00
How the score adds up
- Same core category55/55
- Covers Langfuse's goals16/25
- Feature description similarity2/20
Shared goals 1 of the 2 we tag Langfuse for
Monitoring
Also tagged for
SEO
Goal tags are curated and capped, not a full feature audit — a missing tag is not a missing feature.
Can it really replace Langfuse? Vote on each alternative — no account needed. Votes gently reorder the list; they never change the match score.
Missing an alternative? Suggest it
At a glance: top Langfuse alternatives
| Tool | Match | Input | Output | Pricing | Free plan | Rating | Category |
|---|---|---|---|---|---|---|---|
| Arize Phoenix | 100% | text, data | data | From $50/mo | Yes | — | AI Monitor |
| Helicone | 97% | data | data | From $79/mo | Yes | — | AI Monitor |
| Datadog | 94% | data, code | data | From $15/mo | Yes | — | AI Monitor |
| New Relic AI | 89% | text, data, code | text, code | Freemium | Yes | — | AI Monitor |
| Cisco AI Canvas | 75% | text, data | text, data | Freemium | Yes | — | AI Monitor |
| Elmo | 77% | text | data | From $29/mo | Yes | — | AI Monitor |
Frequently asked
What is the best free Langfuse alternative?
Arize Phoenix (100% match) is the closest free alternative to Langfuse: Arize Phoenix is an open-source platform for AI observability and evaluation, built by Arize. Helicone (97% match) and Datadog (94% match) come next.
What is the best Langfuse alternative for software development?
Respan ranks first for software development at 93% match. See the full list of Langfuse alternatives for Software Development.
How is the match percentage calculated?
It measures how much of Langfuse's job a tool can take over: shared core category, how many of the same use cases it covers and how similar its feature set is. Popularity and ratings never change the percentage; they only break ties in the order. Lists are recomputed nightly and reviewed by editors for the most-visited tools.
How this list is ranked
The match score measures how much of Langfuse's job each tool can take over: shared core category, how many of the same use cases it covers, and how similar its feature set is. Popularity and ratings do not change the score; they only break ties in the order.
Lists are recomputed nightly from the live catalog and reviewed by our editors for the most-visited tools. Sponsored placements are marked and sit outside the ranking.