Best AI Prompt Generators in 2026
Updated
In short: Vellum is ranked #1 of 30 as of 8 October 2026, ahead of PromptWizard and OpenPrompt. The best-ranked option with a free plan is PromptWizard. The lowest first paid tier on this page is VantagePrompt at $3/mo.
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.
30 AI prompt generators ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
18 of the 25 here have a free tier you can use, 0 have open-source code on record, and 0 have full bars: free, open, on most of your devices and documented.
| # | App | Signal | Free tier | Open code | Devices | From | Score |
|---|---|---|---|---|---|---|---|
| 1 | VellumWeb · Windows · Mac · Android · iPhone · Self-hosted · Extension | Three bars | — | 5 of 6 | $30/mo | 6.7 | |
| 2 | PromptWizardWindows · Mac · Linux · Self-hosted · API | Three bars | — | 3 of 6 | Free | 6.6 | |
| 3 | OpenPromptWindows · Mac · Linux · Self-hosted | Three bars | — | 3 of 6 | Free | 6.5 | |
| 4 | AgentaWeb · Self-hosted · API | Two bars | — | 1 of 6 | $29/mo | 6.4 | |
| 5 | Google Cloud Agent EvaluationWeb · API | Two bars | — | 1 of 6 | — | 6.4 | |
| 6 | LatitudeWeb · Self-hosted · API | Two bars | — | 1 of 6 | $99/mo | 6.4 | |
| 7 | Prompt EngineWeb | Two bars | — | 1 of 6 | $4.99/mo | 6.4 | |
| 8 | PromptEvalWeb · API | Two bars | — | 1 of 6 | $9/mo | 6.4 | |
| 9 | PromptForgeWeb · API | Two bars | — | 1 of 6 | $29/mo | 6.4 | |
| 10 | PrompticWeb · API | Two bars | — | 1 of 6 | €149/mo | 6.4 | |
| 11 | PromptitudeWeb · API | Two bars | — | 1 of 6 | $39/mo | 6.4 | |
| 12 | PromptLayerWeb · Self-hosted · API | Two bars | — | 1 of 6 | $49/mo | 6.4 | |
| 13 | PromptotypeWeb | Two bars | — | 1 of 6 | $6/mo | 6.4 | |
| 14 | VantagePromptWeb | Two bars | — | 1 of 6 | $3/mo | 6.4 | |
| 15 | MLflow Prompt OptimizationWeb · Self-hosted · API | Two bars | — | 1 of 6 | Free | 6.3 | |
| 16 | PromptPerfectWeb · API · Extension | Two bars | — | 1 of 6 | Free | 6.3 | |
| 17 | ProofHoundWeb · Self-hosted · API | Two bars | — | 1 of 6 | $29/mo | 6.3 | |
| 18 | ChainForgeWeb · Self-hosted | Two bars | — | 1 of 6 | Free | 5.4 | |
| 19 | TextGradLinux · Self-hosted | One bar | — | — | 1 of 6 | — | 5.4 |
| 20 | GEPASelf-hosted | One bar | — | — | 0 of 6 | — | 5.3 |
| 21 | GEPAzillaWeb · Self-hosted · API | One bar | — | — | 1 of 6 | — | 5.3 |
| 22 | Microsoft Foundry Prompt OptimizerWeb | One bar | — | — | 1 of 6 | — | 5.3 |
| 23 | Amazon Bedrock Prompt ManagementWeb | No signal | — | — | 1 of 6 | — | 5.2 |
| 24 | PromptPexWeb · Windows · Mac · Linux · Self-hosted | One bar | — | — | 4 of 6 | — | 5.2 |
| 25 | PythiaSelf-hosted | One bar | — | — | 0 of 6 | — | 5.2 |
Compare all 25 in a table
| # | App | Score | Free plan | From | Free plan | Paid from | Model support | Optimization mode |
|---|---|---|---|---|---|---|---|---|
| 1 | Vellum | 6.7 | Free plan | $30/mo | Yes | 30 /mo | — | — |
| 2 | PromptWizard | 6.6 | Free plan | Free | Yes | — | multiple | automated |
| 3 | OpenPrompt | 6.5 | Free plan | Free | Yes | — | multiple | assisted |
| 4 | Agenta | 6.4 | Free plan | $29/mo | Yes | 29 /mo | — | — |
| 5 | Google Cloud Agent Evaluation | 6.4 | No | — | — | — | custom | automated |
| 6 | Latitude | 6.4 | Free plan | $99/mo | Yes | 99 /mo | multiple | — |
| 7 | Prompt Engine | 6.4 | Free plan | $4.99/mo | Yes | — | multiple | assisted |
| 8 | PromptEval | 6.4 | Free plan | $9/mo | Yes | 9 /mo | single | assisted |
| 9 | PromptForge | 6.4 | Free plan | $29/mo | Yes | — | multiple | — |
| 10 | Promptic | 6.4 | Free plan | €149/mo | Yes | — | multiple | automated |
| 11 | Promptitude | 6.4 | Free plan | $39/mo | Yes | 39 /mo | multiple | assisted |
| 12 | PromptLayer | 6.4 | Free plan | $49/mo | Yes | 49 /mo | — | — |
| 13 | Promptotype | 6.4 | Free plan | $6/mo | Yes | 6 /mo | multiple | assisted |
| 14 | VantagePrompt | 6.4 | Free plan | $3/mo | Yes | 3 /mo | multiple | automated |
| 15 | MLflow Prompt Optimization | 6.3 | Free plan | Free | Yes | — | multiple | automated |
| 16 | PromptPerfect | 6.3 | Free plan | Free | Yes | — | multiple | automated |
| 17 | ProofHound | 6.3 | Free plan | $29/mo | Yes | — | — | — |
| 18 | ChainForge | 5.4 | Free plan | Free | — | — | custom | manual |
| 19 | TextGrad | 5.4 | No | — | Yes | — | multiple | automated |
| 20 | GEPA | 5.3 | No | — | — | — | multiple | automated |
| 21 | GEPAzilla | 5.3 | No | — | — | — | multiple | automated |
| 22 | Microsoft Foundry Prompt Optimizer | 5.3 | No | — | — | — | — | automated |
| 23 | Amazon Bedrock Prompt Management | 5.2 | No | — | — | — | multiple | automated |
| 24 | PromptPex | 5.2 | No | — | — | — | multiple | automated |
| 25 | Pythia | 5.2 | No | — | — | — | custom | automated |
Is your app on this list?
Numbered spots on this list can be sponsored, and a sponsored row is labelled as paid.
Questions about this list
Which AI prompt generator is ranked first on Freedom251?
Vellum is ranked #1 of 30 with a score of 6.7. PromptWizard is second and OpenPrompt third.
How many of these have a free plan?
17 of the 25 on this page publish a free plan on their own pricing pages.
Which is the cheapest paid option?
On this page, VantagePrompt has the lowest first paid tier we found: $3/mo.
How is this list ranked?
Ranked free-and-open first: a usable free tier and open-source code, then the platforms it runs on and its documentation.