Free and open first
Best AI Prompt Generators in 2026
From drafting a prompt to testing and refining it, these tools cover capabilities you can compare for different AI workflows. Look at model support, optimization mode, prompt testing, and prompt variables to see which listed features align with your work. API access and team collaboration may matter when prompts connect with other systems or involve several people; template limits add another point to weigh. Vellum, PromptWizard, and Agenta are among the named options, along with Google Cloud Agent Evaluation. Compare free-plan availability and paid-from pricing as well, then consider which capabilities suit the models and prompt tasks you use.
- 28 apps
- Research read 23 Sept 2026
- How the order is worked out
- 1
Agenta
Free plan Open source APISelf-hostedWebAgenta combines agent-building, automation, and run observability, with both cloud and self-hosted options.
- 2
Latitude
Free plan Open source APILinuxSelf-hosted+1Latitude combines agent observability with workflows for investigating and retesting production failures.
- 3
Vellum
Free plan Open source AndroidAPIExtension+5Vellum offers a personal assistant with saved context, skills, integrations and approval controls.
- 4
OpenPrompt
Free plan LinuxMacSelf-hosted+1Choose OpenPrompt if you need a free framework for prompt-learning research or development across its documented NLP tasks and methods.
- 5
ChainForge
Free plan Self-hostedWebChainForge supports structured prompt experiments with comparison, scoring, and plotting features.
- 6
GEPA
Free plan APISelf-hostedChoose GEPA if you want an open-source, self-hosted way to optimize text-based system components using evaluator feedback and readable traces.
- 7
MLflow Prompt Optimization
Free plan APISelf-hostedWebMLflow Prompt Optimization combines automated prompt revisions with evaluation and version tracking, and supports multiple frameworks and providers.
- 8
GEPAzilla
Free plan APISelf-hostedWebGEPAzilla offers prompt optimization with validation ranking, diagnostics, and latency metrics. Users need an AI Gateway key, and dataset import is currently limited to clipboard JSON.
- 9
PromptEval
Free plan APIWebPromptEval combines prompt scoring, optimization, version history, and testing with API and pull-request workflows. Review the plan quotas, character limits, and rate limit before choosing a tier.
- 10
PromptLayer
Free plan APISelf-hostedWebPromptLayer brings prompt editing, evaluation, and operational monitoring into one workflow, with collaboration features for technical and non-technical contributors.
- 11
PromptWizard
Free plan APILinuxMac+2PromptWizard provides an iterative framework for optimizing prompts and examples, including support for custom datasets.
- 12
DSPy
Free plan APISelf-hostedChoose DSPy if you are building AI programs in Python and want task signatures, composable modules, and prompt optimization.
- 13
Prompt Engine
Free plan WebPrompt Engine combines prompt editing, organization, templates, chains, and assisted optimization in a web platform.
- 14
PromptForge
Free plan APIWebChoose PromptForge if you need a place to test, gate, version, and deploy prompts across model providers.
- 15
Promptic
Free plan APIWebPromptic combines tracing and evaluation with optimization workflows and several access methods.
- 16
Promptitude
Free plan APIWebPromptitude combines prompt development, sharing and API integration, with a limited free plan and paid tiers.
- 17
PromptPerfect
Free plan APIExtensionWebPromptPerfect combines prompt rewriting with explanations across its web app, extension, and API. The shared quota on the hosted Gemini free tier is worth noting for anonymous callers.
- 18
ProofHound
Free plan APISelf-hostedWebChoose ProofHound for LLM classification workflows that need prompt iteration, auditable experiments, and controlled deployment.
- 19
Promptotype
Free plan WebChoose Promptotype to develop structured LLM tasks with prompt templates, expected-output checks, and collection testing.
- 20
PromptSource
Free plan APISelf-hostedWebPromptSource combines a prompt editor, dataset views, an API, and a substantial English prompt collection. Developers should note its Python requirement and the limits of the hosted Sourcing mode.
- 21
VantagePrompt
Free plan WebChoose VantagePrompt if you want an automated prompt refinement workflow with scoring, reusable templates, and support for multiple media tools.
- 22
TextGrad
Free plan LinuxSelf-hostedTextGrad provides a PyTorch-like way to optimize text and other objects using LLM feedback. Its provider keys, experimental engine, and deployment options are important practical considerations.
- 23
PromptPex
Paid LinuxMacSelf-hosted+2PromptPex offers a way to generate and evaluate tests for prompt requirements across models.
- 24
Microsoft Foundry Prompt Optimizer
Paid WebPrompt Optimizer provides an iterative way to revise agent instructions and review why paragraphs changed.
5.1 Visit site - 25
Promptimal
Paid LinuxPromptimal provides configurable, terminal-based prompt optimization with default or custom scoring. Its current setup centers on Linux and the OpenAI API, while additional providers are planned.
#1Places #1, #2, #3, #4, #5 on this list can be bought by the makers of the software on it. See the price
More in AI Tools
- AI Prompt Management Software25
- AI Proposal Generators26
- AI Quiz Generators29
- AI Readability Checkers26
- AI Recruiting Assistants30
- AI Research Assistants28
- AI Resume Builders80
- AI Reverse Image Search Tools31
- AI Review Response Generators25
- AI RFP Response Software33
- AI Roleplay Chatbots46
- AI Sales Assistants34