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
Facts read 24 Sep 2026 – 21 Oct 2026
This list covers prompt engineering tools for building, testing, evaluating and deploying prompts across AI models. It helps developers and teams compare capabilities before choosing a tool.
The standings: top 10
| Name | In a line | Record score | Price from | Try it free | Runs on | Facts read |
|---|---|---|---|---|---|---|
| 01 Vellum | Vellum suits individuals looking for an AI assistant to handle personal tasks across files, calendars, email, code, and computer controls. | 6.4 | $30 a month | Free plan | Android, iPhone & iPad, Web, Windows | 15 Oct 2026 |
| 02 W&B Weave | Weave suits teams building or operating production AI agents that need tracing, evaluations, interaction monitoring, or prompt comparisons. | 6.2 | $60 a month | Free plan | iPhone & iPad, Web, Windows, Mac | 20 Oct 2026 |
| 03 DeepEval | DeepEval suits developers building repeatable evaluations for AI systems, especially those running tests in Python or CI/CD. | 6.0 | $200 a month | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 04 Langfuse | Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools. | 5.7 | $29 a month | Free plan | Web, Linux, API, Self-hosted | 15 Oct 2026 |
| 05 Agenta | Agenta suits teams that want to create and operate AI agents across work tools, with cloud or self-hosted deployment options. | 5.5 | $29 a month | Free plan | Web, API, Self-hosted | 14 Oct 2026 |
| 06 LangSmith | LangSmith suits teams developing AI agents that need evaluation, prompt tools, tracing, and production monitoring. | 5.3 | $39 usage-based | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 07 Promptfoo | Promptfoo is for developers and enterprises building AI applications who need prompt evaluation or red-team testing. | 5.3 | Free plan | Free plan | Web, Windows, Mac, Linux | 15 Oct 2026 |
| 08 Giskard | It suits teams assessing conversational AI agents for safety and quality issues before production. | 5.2 | Free plan | Free plan | Web, Linux, API, Self-hosted | 21 Oct 2026 |
| 09 Maxim AI | 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… | 5.2 | $29 a month | Free plan | Web, API, Self-hosted | 2 Oct 2026 |
| 10 Braintrust | Braintrust is intended for teams running AI agents in production, from early-stage projects to enterprise deployments. | 5.0 | $249 a month | Free plan | Web, API, Self-hosted | 15 Oct 2026 |
The page orders releases by newest first and uses figures published by the makers. It does not score the tools.
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
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.
8
Giskard
WebLinuxAPI+1 Free plan Record5.2 Visit It suits teams assessing conversational AI agents for safety and quality issues before production.
9
Maxim AI
WebAPISelf-hosted $29 a month Record5.2 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…
10
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.
12
Laminar
WebAPISelf-hosted $30 a month Record4.7 Visit Laminar suits teams building AI agents that need to trace model and tool activity, investigate runs, or evaluate changes against datasets.
13
PromptLayer
WebAPISelf-hosted $49 a month Record4.6 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 Record4.6 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
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.
17
Galileo
WebAPISelf-hosted $100 a month, billed yearly Record4.4 Visit Galileo is designed for engineers, product managers, and subject matter experts building AI applications.
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 Record4.3 Visit The registry suits solo data scientists and large machine-learning platform teams that need version tracking and lifecycle workflows.
Before you choose
Compare free and paid access
A free plan appears among the available pricing models. Paid plans are also listed, with maker-published starting prices where provided.
A free trial can offer a time-limited way to assess a tool before a paid commitment.
Check code access
Open-source code is available from tools in this category. This can suit readers who need to inspect or change the code.
Review the licence and hosting requirements before adding an open-source tool to a project.
Match your platform
These tools can run as self-hosted software, web services, APIs, or desktop and server software for Linux, macOS and Windows.
Choose a deployment model that fits your team’s systems, access controls and maintenance work.
Compare prompt workflows
The comparison covers prompt versioning and prompt playgrounds for creating and managing prompt variants.
Automated evaluations and prompt optimization can help structure review and refinement work.
Review model connections
Model provider support and deployment integrations are comparison points for this category.
Check that a tool connects to the model providers and deployment systems used by your application.
Questions
What are prompt engineering tools used for?
They support prompt creation, versioning, playground work, automated evaluations, optimization and deployment connections.
Can I use a prompt engineering tool for free?
Yes. Tools on this list offer free plans, and open-source options are available.
Which platforms can these tools run on?
Listed platform options include self-hosted, web, API, Linux, macOS and Windows deployments.
Do these tools support prompt versioning?
Prompt versioning is one of the comparison points used for this category.
Can I evaluate prompts automatically?
Automated evaluations are included among the comparison points for the tools.
More in AI Tools
AI Writing Tools 269AI video generators 241Text-to-Speech Software 223AI Travel Planners 161AI image generators 124AI Music Generators 123AI Presentation Makers 109AI Video Caption Generators 99AI Photo Editors 96AI Background Removers 94AI Meeting Assistants 82AI Resume Builders 80AI Video Editors 80AI Job Search Tools 67AI chatbots and assistants 65AI Logo Makers 65AI Face Swap Tools 57AI Governance Software 56