AI Tools
Best Prompt Engineering Tools in 2026
Prompt engineering tools help you build, compare and improve prompts for AI models. This list is for people choosing software for prompt versioning, testing, evaluation or deployment work.
- 01
Agenta Agenta suits teams that want to create, automate, and monitor AI agents across connected tools.
From $29/mo Free plan Open source Web · API · Self-hosted9.3 Visit Specs - 02
DeepEval DeepEval suits developers building evaluation pipelines for AI systems, particularly those who want tests to run in CI/CD or Python scripts.
From $200/mo Free plan Open source Web · Windows · macOS · Linux9.3 Visit Specs - 03
Braintrust Braintrust is aimed at teams operating AI agents in production, from early-stage teams to enterprises.
From $249/mo Free plan Web · API · Self-hosted9.2 Visit Specs - 04
LangSmith LangSmith suits teams engineering AI agents that need evaluation, tracing, prompt work, deployment, and production monitoring.
From $39/mo Free plan Web · Windows · macOS · Linux9.1 Visit Specs - 05
Langfuse Langfuse suits teams building AI agent applications that need tracing, prompt management, and evaluation tools.
From $29/mo Free plan Open source Web · Linux · API · Self-hosted9.0 Visit Specs - 06
Giskard Giskard suits teams evaluating conversational AI agents for security and quality issues before production.
Free plan Open source Web · Linux · API · Self-hosted8.7 Visit Specs - 07 Vellum
Vellum suits an individual looking for an assistant that can handle files, calendars, email, code, and computer control.
From $30/mo Free plan Open source Web · Windows · macOS · iOS8.6 Visit Specs - 08
W&B Weave Weave suits teams monitoring and evaluating production AI agents, particularly those using supported frameworks and models.
From $60/mo Free plan Open source Web · Windows · macOS · Linux8.6 Visit Specs - 09 ChainForge
ChainForge suits people comparing prompts and model responses through visual experiments, including those who want to score or plot results.
Free plan Web · Self-hosted8.5 Visit Specs - 10
Promptfoo It suits developers and enterprises evaluating prompts or testing AI applications for risks.
Free plan Open source Web · Windows · macOS · Linux8.5 Visit Specs - 11
Maxim AI It suits cross-functional AI teams that need to evaluate agents and monitor them in production.
From $29/mo Free plan Web · API · Self-hosted8.2 Visit Specs - 12 Arize Phoenix
It suits teams operating AI applications that need model, retrieval, tool, prompt, and evaluation tracing.
Free plan Web · API · Self-hosted8.1 Visit Specs - 13
Laminar Laminar suits teams instrumenting AI-agent systems that need tracing, evaluations, debugging, and dashboards.
From $30/mo Free plan Web · API · Self-hosted8.1 Visit Specs - 14 TruLens Free plan Open source API · Self-hosted7.9 Visit Specs
- 15
Galileo Galileo is designed for engineers, product managers and subject matter experts building AI applications.
From $100/mo Web · API · Self-hosted7.8 Visit Specs - 16
HoneyHive HoneyHive is aimed at AI platform teams, AI engineers, domain experts, and risk or governance teams.
Free plan Web · API · Self-hosted7.8 Visit Specs - 17
PromptLayer PromptLayer is for engineers and domain experts who build or improve AI products together.
From $49/mo Free plan Web · API · Self-hosted7.8 Visit Specs - 18
ProofHound It suits operations, risk, and analyst teams handling critical classification workflows such as risk control, financial judgment, content moderation, or customer-service intent recognition.
From $29/mo Free plan Web · API · Self-hosted7.7 Visit Specs - 19 MLflow Model Registry
The registry suits solo data scientists and larger machine-learning platform teams that need model versioning and lifecycle workflows.
Free plan Web · Linux · API · Self-hosted7.6 Visit Specs - 20 DSPy API · Self-hosted7.5 Visit Specs
- 21 TextGrad Linux · Self-hosted6.7 Visit Specs
- 22
Amazon Bedrock Prompt Management Web6.1 Visit Specs - 23 Microsoft Foundry Agent Evaluation Web5.6 Visit Specs
- 24 OpenAI Playground Web5.6 Visit Specs
- 25 PromptTools 5.2 Visit Specs
Compare free plans and paid entry prices, then check prompt playgrounds, automated evaluations, optimization, model-provider support and deployment integrations. Confirm whether the tool runs on your preferred platform, offers a trial or publishes open-source code.