AI Tools·Standings

Prompt Engineering Tools

Prompt engineering tools help you create, compare, and improve prompts for AI models; the choice depends on the features you need and where the tool can run.

Compare prompt versioning, a prompt playground for trying changes, automated evaluations, and prompt optimization. Check model providers and deployment integrations, plus the API, open-source, and free-tier marks.

• 25 platforms
• 1 with a public API on this page
• 22 with a free tier
• Checked 7 Oct 2026

1. #PlatformSignalPlugs inPrice
2. 1
   V

   Vellumvellum.ai

   Personal AI assistant for files, calendars, memory, and custom skills; free tier, upgrades from $30 monthly.

   7.7 APIOpenFree Free tier · from $30/mo
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3. 2
   D

   DeepEvaldeepeval.com

   Free open-source framework for evaluating AI systems with Pytest in scripts or CI/CD.

   7.7 APIOpenFree Free tier · from $200/mo
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4. 3
   P

   Promptfoopromptfoo.dev

   Free open-source tool comparing prompts across models and simulating attacks on AI applications.

   7.7 APIOpenFree Free tier
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5. 4
   WB

   W&B Weavesite.wandb.ai

   An open-source platform helps track and improve AI agents in production; free plan, paid from $60 monthly.

   7.7 APIOpenFree Free tier · from $60/mo
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6. 5
   G

   Giskardgiskard.ai

   An open-source platform for checking AI agents for attacks, data exposure, and inaccurate or missing answers.

   7.4 APIOpenFree Free tier
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7. 6
   L

   Langfuselangfuse.com

   An open-source tool for tracing AI activity and managing, testing, and deploying prompt versions.

   7.4 APIOpenFree Free tier · from $29/mo
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8. 7
   A

   Agentaagenta.ai

   An open-source workspace for creating team AI coworkers from templates and using them in Slack or Telegram.

   7.3 APIOpenFree Free tier · from $29/mo
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9. 8
   T

   TruLenstrulens.org

   An open-source tool traces AI steps and scores agents, retrieval apps, and summaries.

   7.1 APIOpenFree Free tier
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10. 9
    L

    LangSmithlangchain.com

    A platform for scoring live agent activity and evaluating results against selected datasets.

    6.7 APIOpenFree Free tier · $39 usage-based
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11. 10
    B

    Braintrustbraintrust.dev

    A platform that inspects agent traces and scores dataset runs for prompt and model changes.

    6.3 APIOpenFree Free tier · from $249/mo
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12. 11
    C

    ChainForgechainforge.ai

    An open-source visual tool for comparing model replies, scoring them, and testing conversations.

    6.3 APIOpenFree Free tier
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13. 12
    G

    Galileogalileo.ai

    Freemium platform for evaluating and monitoring GenAI agents with guardrails and dataset experiments.

    6.0 APIOpenFree Free tier · from $100/mo
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14. 13
    MA

    Maxim AIgetmaxim.ai

    A platform for simulating and evaluating agents and testing, versioning, and deploying prompts.

    6.0 APIOpenFree Free tier · from $29/mo
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15. 14
    T

    TextGradtextgrad.com

    A free Python package uses language-model feedback to refine text, code, prompts, and more.

    5.9 APIOpenFree Free tier
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16. 15
    AP

    Arize Phoenixarize.com

    A free platform that scores traces, versions prompts, replays calls, and compares dataset runs.

    5.9 APIOpenFree Free tier
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17. 16
    H

    HoneyHivehoneyhive.ai

    A tool for reviewing agent steps, evaluating live activity, spotting drift, and sending alerts.

    5.9 APIOpenFree Free tier
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18. 17
    MM

    MLflow Model Registrymlflow.org

    A free registry with an API and UI for tracking model versions, lineage, tags, and stages.

    5.9 APIOpenFree Free tier
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19. 18
    D

    DSPydspy.ai

    An open-source Python framework that defines typed tasks and composes optimizable AI systems.

    5.8 APIOpenFree Free tier
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20. 19
    L

    Laminarlaminar.sh

    An open-source tool for reading agent traces, replaying runs from cache, and evaluating datasets.

    5.8 APIOpenFree Free tier · from $30/mo
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21. 20
    P

    PromptLayerpromptlayer.com

    A visual prompt workspace for editing, testing, deploying, and comparing prompts and models.

    5.8 APIOpenFree Free tier · from $49/mo
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22. 21
    P

    ProofHoundproofhound.org

    A prompt optimizer reviews classification errors in uploaded data and keeps versions for rollback.

    5.8 APIOpenFree Free tier · from $29/mo
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23. 22
    P

    PromptToolsprompttools.ai

    A web playground for trying prompts and running automated evaluations.

    4.6 APIOpenFree Free tier
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24. 23
    AB

    Amazon Bedrock Prompt Managementaws.amazon.com

    A paid browser tool for shared prompts, reusable variables, testing, and automatic optimization.

    4.1 APIOpenFree —
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25. 24
    MF

    Microsoft Foundry Agent Evaluationazure.microsoft.com

    A paid browser tool for evaluating agents and working with prompt versions, tests, and optimization.

    4.1 APIOpenFree —
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26. 25
    OP

    OpenAI Playgroundplatform.openai.com

    A paid browser workspace for testing OpenAI prompts, tracking versions, and running evaluations.

    4.1 APIOpenFree —
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Places #1, #2, #3, #4, #5 on this board are open to sponsors. Take #1 · Other ways to advertise

How to choose

Which prompt features do I need?

Choose based on the work you want to do: compare prompt versioning, a playground for trying prompts, automated evaluations, and prompt optimization.

If you need to check whether prompt changes affect results, look for evaluation features. For organizing changes over time, compare versioning.

Which model providers and deployment integrations do I need?

Check that the tool supports the model providers and deployment integrations you already use.

The board compares these capabilities, but the available facts do not specify which providers or integrations each tool supports.

Where does the tool need to run?

Choose a platform that fits your setup: options across the category include web, API, self-hosted, Linux, macOS, and Windows.

Check the individual tool’s platform details before choosing; platform support differs.

Can I try a prompt engineering tool for free?

Many tools offer a free plan, and open-source options are available. A free plan is different from a free trial, so check which one the maker offers.

For example, Agenta lists a free plan and paid plans from $29 per month. Prices and plan details vary by tool.

Do I need an API or open-source code?

Choose an API if you need the tool to connect through a public interface, and consider open-source code if you need to inspect or change the software.

Check the tool’s API and open-source marks, then confirm its plan and licence details with the maker.

Questions

What is a prompt engineering tool?

It helps you create, manage, compare, or improve prompts for AI models. Features to compare include versioning, a playground, evaluations, and optimization.

Which prompt engineering tools have a free plan?

Free plans are available across the category. Check each maker’s current plan details, since a free plan and a free trial are different.

Can I self-host prompt engineering software?

Self-hosted options are available. Confirm the platform details for the tool you are considering.

What should I check before choosing a prompt tool?

Check its prompt features, model providers, deployment integrations, supported platforms, API access, open-source status, and pricing.

Does open-source mean the tool is free?

Not necessarily. Check the maker’s pricing and licence details; open-source code and a free plan are separate marks.

Some top positions on this board can be paid placements, standing where they were sold. The facts on each platform are not for sale. How we rank · Disclosure