Free alternatives to LangSmith
3 free programs that can replace LangSmith, each pairing checked by Radar's AI reviewer or by Radar.
LangSmith, from LangChain, is an online platform for people building applications on top of language models. Developers use it to trace what an application did step by step, evaluate answers against test sets, manage prompts and monitor behaviour over time. Its plans are paid, and your data is stored by the service.
Before switching, check these points:
- How your code sends its traces today. You may have to change the instrumentation, and some tools expect different libraries.
- Whether you can export your datasets, evaluation results and prompt versions, so the history does not stay behind.
- If you run the tool yourself, who will maintain the servers, the database and the updates.
- Access control for the team, and what your prompts and user data may contain before you decide where to store them.
- Your use of LangChain or LangGraph, which may affect how smoothly each option fits.
Dify is among the names in the list below, which covers different ways to do this job.
| Program | Ease | You need | Risk signals | Stars | Downloads this week |
|---|---|---|---|---|---|
| DifyA web workspace for building AI chatbots, assistants and automated workflows by joining blocks on a canvas. | Ease Binstaller plus one simple step · Web | Docker | Attention · 1 | 160,110+479 in 5 days | 1,689 |
| iFixAiAudits your own AI agent: sends it tricky requests and grades how it answers, from A to F. | Ease Cinstall 1 or 2 tools · Windows | Python | Attention · 1 | 41,458+6,394 in 5 days | — |
| Harness2A research framework that rewrites an AI agent's own prompts, tools and memory to make it do better on a task. | Ease Dterminal, several tools or a specific graphics card · Linux | Python, Node.js, Docker, Other tools | Attention · 2 | 21,675+2,002 in 6 days | — |
Frequently asked questions
Which free alternative to LangSmith is the easiest to install?
Dify has the highest ease rating among the 3 options: B (installer plus one simple step · Web).
Is there a free alternative to LangSmith for Windows, Mac and Linux?
Windows: Dify, iFixAi. macOS: Dify, iFixAi. Linux: Dify, iFixAi, Harness2.
Are the alternatives to LangSmith really free?
0 of the 3 are completely free; 3 depend on a paid service or key for some features.
How can I tell whether an alternative is trustworthy?
Each card shows the risk signals found, with the evidence. 0 of the 3 have no signal rated attention or high. See also the guide How to find a GitHub project's official repository and avoid fake copies.