Best AI Prompt Generators in 2026
25 ai prompt generators ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
25ranked
17free plans on this page
$3/molowest paid tier
21 Sept 2026last checked
#1 MLflow Prompt Optimization Top pick · 8.6 Free plan · Free
#2 Agenta Runner-up · 8.5 Free plan · $29/mo
#3 PromptLayer Also great · 8.2 Free plan · $49/mo
- Free plan Web
- Free plan
- Yes
- Model support
- multiple
- Optimization mode
- automated
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan apiself-hostedWeb
- Free plan
- Yes
- Paid from
- 29 /mo
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial$29/mofirst paid tier About AgentaVisit site - Free plan apiself-hostedWeb
- Free plan
- Yes
- Paid from
- 49 /mo
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial$49/mofirst paid tier About PromptLayerVisit site - Free plan Web
- Free plan
- Yes
- Model support
- multiple
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free planFree trial apiWeb
- Free plan
- Yes
- Paid from
- 39 /mo
- Model support
- multiple
- Optimization mode
- assisted
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial$39/mofirst paid tier About PromptitudeVisit site - Free plan apiWeb
- Free plan
- Yes
- Paid from
- 9 /mo
- Model support
- single
- Optimization mode
- assisted
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial$9/mofirst paid tier About PromptEvalVisit site - Free plan apiself-hostedWeb
- Free plan
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial$29/mofirst paid tier About ProofHoundVisit site - Free plan apiWeb
- Free plan
- Yes
- Model support
- multiple
- Optimization mode
- automated
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial€149/mofirst paid tier About PrompticVisit site - Free plan Web
- Free plan
- Yes
- Paid from
- 6 /mo
- Model support
- multiple
- Optimization mode
- assisted
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial$6/mofirst paid tier About PromptotypeVisit site - Free plan
- Free plan
- Yes
- Model support
- multiple
- Optimization mode
- automated
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan apiLinuxmacOSself-hostedWindows
- Free plan
- Yes
- Model support
- multiple
- Optimization mode
- automated
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial -
- Model support
- multiple
- Optimization mode
- automated
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan Web
- Free plan
- Yes
- Paid from
- 3 /mo
- Model support
- multiple
- Optimization mode
- automated
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial$3/mofirst paid tier About VantagePromptVisit site - Free plan Web
- Free plan
- Yes
- Model support
- multiple
- Optimization mode
- assisted
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Linux
- Model support
- multiple
- Optimization mode
- automated
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan Web
- Free plan
- Yes
- Model support
- multiple
- Optimization mode
- automated
RecognisedDocumentedFree planPlatformsFree trial - Free plan LinuxWindowsmacOS
- Free plan
- Yes
- Model support
- multiple
- Optimization mode
- assisted
- Prompt variables
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Web
- Model support
- custom
- Optimization mode
- manual
- Prompt variables
- Yes
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan AndroidextensioniOSmacOSself-hostedWebWindows
- Free plan
- Yes
- Paid from
- 30 /mo
RecognisedDocumentedFree planPlatformsFree trial$30/mofirst paid tier About VellumVisit site -
- Model support
- multiple
- Optimization mode
- automated
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Free plan Web
- Free plan
- Yes
- Paid from
- 99 /mo
- Model support
- multiple
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Web
- Model support
- multiple
- Optimization mode
- automated
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial -
- Model support
- custom
- Optimization mode
- automated
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial -
- Model support
- single
- Optimization mode
- automated
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial - Web
- Prompt testing
- Yes
RecognisedDocumentedFree planPlatformsFree trial
Is your platform on this list?
Numbered spots on this list can be sponsored. They are labelled, and the editorial order and scores never change for payment.
Questions about this list
Which ai prompt generator is ranked first on The Geeks Club?
MLflow Prompt Optimization is ranked #1 of 25 with a score of 8.6. Agenta is second and PromptLayer 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?
Certifications are listed from the provider's own catalogue with level, role and exam. Platforms are ranked on what each publishes: a free tier or trial, price, certificates offered, the devices it runs on and the depth of its documentation. Paid placements never change a rank.