Vellum suits individuals looking for an AI assistant to handle personal tasks across files, calendars, email, code, and computer controls.
Free plan Open source From $30 a month AndroidiPhone & iPadWebWindowsMacBrowser extension+2
Best Prompt Engineering Tools 2026
Every product here is ranked by Samsung Mobile US Press's record score: what its maker publishes about it, where it runs (Android first), whether it is free to try, and how recently the facts were read.
02
W&B Weave
Weave suits teams building or operating production AI agents that need tracing, evaluations, interaction monitoring, or prompt comparisons.
iPhone & iPadWebWindows+4 Record6.2 Visit
03
DeepEval
DeepEval suits developers building repeatable evaluations for AI systems, especially those running tests in Python or CI/CD.
WebWindowsMac+3 Record6.0 Visit
04
Langfuse
Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools.
WebLinuxAPI+1 Record5.7 Visit
05
Agenta
Agenta suits teams that want to create and operate AI agents across work tools, with cloud or self-hosted deployment options.
WebAPISelf-hosted Record5.5 Visit
6
LangSmith
WebWindowsMac+3 $39 usage-based Record5.3 Visit LangSmith suits teams developing AI agents that need evaluation, prompt tools, tracing, and production monitoring.
7
Maxim AI
WebAPISelf-hosted $29 a month Record5.3 Visit It is designed for cross-functional AI teams, including product managers who want to define and analyze evaluations without code and developers who use SDKs, a CLI, or…
8
Promptfoo
WebWindowsMac+3 Free plan Record5.3 Visit Promptfoo is for developers and enterprises building AI applications who need prompt evaluation or red-team testing.
9
Braintrust
WebAPISelf-hosted $249 a month Record5.0 Visit Braintrust is intended for teams running AI agents in production, from early-stage projects to enterprise deployments.
10
Laminar
WebAPISelf-hosted $30 a month Record4.8 Visit Laminar suits teams building AI agents that need to trace model and tool activity, investigate runs, or evaluate changes against datasets.
12
Giskard
WebLinuxAPI+1 Free plan Record4.7 Visit It suits teams assessing conversational AI agents for safety and quality issues before production.
13
PromptLayer
WebAPISelf-hosted $49 a month Record4.7 Visit PromptLayer suits engineers and domain experts who need to manage prompts, evaluate changes, and observe AI product activity together.
14
ProofHound
WebAPISelf-hosted $29 a month Record4.7 Visit ProofHound suits operations, risk, analyst, and engineering teams managing critical classification workflows.
15
ChainForge
WebSelf-hosted Free plan Record4.5 Visit ChainForge suits people comparing prompts and language model responses, including those who want to score and plot results.
16
Galileo
WebAPISelf-hosted $100 a month, billed yearly Record4.5 Visit Galileo is designed for engineers, product managers, and subject matter experts building AI applications.
17
Arize Phoenix
WebAPISelf-hosted Free plan Record4.4 Visit Phoenix suits teams that need to inspect AI application traces and compare evaluation results across versions.
18
HoneyHive
WebAPISelf-hosted Free plan Record4.4 Visit It suits AI platform teams, AI engineers, domain experts, and risk and governance teams that need production agent visibility.
19
MLflow Model Registry
WebLinuxAPI+1 Free plan Record4.4 Visit The registry suits solo data scientists and large machine-learning platform teams that need version tracking and lifecycle workflows.
More in AI Tools
AI Writing Tools 269AI video generators 242Text-to-Speech Software 223AI Travel Planners 161AI image generators 124AI Music Generators 123AI Presentation Makers 109AI Video Caption Generators 99AI Photo Editors 97AI Background Removers 94AI Meeting Assistants 82AI Video Editors 81AI Resume Builders 80AI Job Search Tools 67AI chatbots and assistants 65AI Logo Makers 65AI Face Swap Tools 57AI Governance Software 56