Best AI Prompt Generators in 2026
Updated
In short: Agenta is ranked #1 of 29 as of 5 October 2026, ahead of Promptitude and PromptWizard. The best-ranked option with a free plan is Promptitude. The lowest first paid tier on this page is VantagePrompt at $3/mo.
Prompt generators can support the work of creating, refining, testing, and reusing prompts across models. Compare model support and optimization mode, then check prompt testing, variables, and template limits for the degree of workflow fit you need. API access and team collaboration may matter when prompts are shared or connected to other work; free-plan availability and paid-from pricing offer cost context. Agenta, Promptitude, and PromptWizard are among the entries, alongside Google Cloud Agent Evaluation, Latitude, and MLflow Prompt Optimization. Use these listed features to focus on the models, prompt tasks, and collaboration needs that matter to your team.
29 AI prompt generators ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
AI Prompt Generators, one module each. A lit port is something its maker publishes; 12 of the 25 on this page have a public API.
- 01 Agenta API yesOSS not on recordFREE yesDOCS 7.4$29/mo
- 02 Promptitude API yesOSS not on recordFREE yesDOCS 7.4$39/mo
- 03 PromptWizard API yesOSS not on recordFREE yesDOCS 7.4Free
- 04 Google Cloud Agent Evaluation API yesOSS not on recordFREE yesDOCS 7.3
- 05 Latitude API yesOSS not on recordFREE yesDOCS 7.3$99/mo
- 06 MLflow Prompt Optimization API yesOSS not on recordFREE yesDOCS 7.3Free
- 07 PromptEval API yesOSS not on recordFREE yesDOCS 7.3$9/mo
- 08 Promptic API yesOSS not on recordFREE yesDOCS 7.3€149/mo
- 09 PromptLayer API yesOSS not on recordFREE yesDOCS 7.3$49/mo
- 10 ProofHound API yesOSS not on recordFREE yesDOCS 7.2$29/mo
- 11 GEPAzilla API yesOSS not on recordFREE not on recordDOCS 6.8
- 12 Amazon Nova ReelAmazon Web Services API yesOSS not on recordFREE not on recordDOCS 6.6
- 13 Promptotype API not on recordOSS not on recordFREE yesDOCS 6.0$6/mo
- 14 VantagePrompt API not on recordOSS not on recordFREE yesDOCS 6.0$3/mo
- 15 Prompt Engine API not on recordOSS not on recordFREE yesDOCS 5.9$4.99/mo
- 16 Vellum API not on recordOSS not on recordFREE yesDOCS 5.9$30/mo
- 17 TextGrad API not on recordOSS not on recordFREE not on recordDOCS 5.6
- 18 GEPA API not on recordOSS not on recordFREE not on recordDOCS 5.4
- 19 Microsoft Foundry Prompt Optimizer API not on recordOSS not on recordFREE not on recordDOCS 5.4
- 20 Pythia API not on recordOSS not on recordFREE not on recordDOCS 5.4
- 21 Amazon Bedrock Prompt Management API not on recordOSS not on recordFREE not on recordDOCS 5.2
- 22 ChainForge API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 23 DSPy API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 24 OpenPrompt API not on recordOSS not on recordFREE not on recordDOCS 5.1
- 25 PromptForge API not on recordOSS not on recordFREE not on recordDOCS 5.1
Compare all 25 in a table
| # | Platform | Score | Free plan | From | Free plan | Paid from | Model support | Optimization mode |
|---|---|---|---|---|---|---|---|---|
| 1 | Agenta | 7.4 | Free plan | $29/mo | Yes | 29 /mo | — | — |
| 2 | Promptitude | 7.4 | Free plan | $39/mo | Yes | 39 /mo | multiple | assisted |
| 3 | PromptWizard | 7.4 | Free plan | Free | Yes | — | multiple | automated |
| 4 | Google Cloud Agent Evaluation | 7.3 | No | — | — | — | custom | automated |
| 5 | Latitude | 7.3 | Free plan | $99/mo | Yes | 99 /mo | multiple | — |
| 6 | MLflow Prompt Optimization | 7.3 | Free plan | Free | Yes | — | multiple | automated |
| 7 | PromptEval | 7.3 | Free plan | $9/mo | Yes | 9 /mo | single | assisted |
| 8 | Promptic | 7.3 | Free plan | €149/mo | Yes | — | multiple | automated |
| 9 | PromptLayer | 7.3 | Free plan | $49/mo | Yes | 49 /mo | — | — |
| 10 | ProofHound | 7.2 | Free plan | $29/mo | Yes | — | — | — |
| 11 | GEPAzilla | 6.8 | No | — | — | — | multiple | automated |
| 12 | Amazon Nova Reel | 6.6 | No | — | — | — | multiple | automated |
| 13 | Promptotype | 6.0 | Free plan | $6/mo | Yes | 6 /mo | multiple | assisted |
| 14 | VantagePrompt | 6.0 | Free plan | $3/mo | Yes | 3 /mo | multiple | automated |
| 15 | Prompt Engine | 5.9 | Free plan | $4.99/mo | Yes | — | multiple | assisted |
| 16 | Vellum | 5.9 | Free plan | $30/mo | Yes | 30 /mo | — | — |
| 17 | TextGrad | 5.6 | No | — | Yes | — | multiple | automated |
| 18 | GEPA | 5.4 | No | — | — | — | multiple | automated |
| 19 | Microsoft Foundry Prompt Optimizer | 5.4 | No | — | — | — | — | automated |
| 20 | Pythia | 5.4 | No | — | — | — | custom | automated |
| 21 | Amazon Bedrock Prompt Management | 5.2 | No | — | — | — | multiple | automated |
| 22 | ChainForge | 5.1 | No | — | — | — | custom | manual |
| 23 | DSPy | 5.1 | No | — | — | — | multiple | automated |
| 24 | OpenPrompt | 5.1 | No | — | Yes | — | multiple | assisted |
| 25 | PromptForge | 5.1 | No | — | Yes | — | multiple | — |
Is your platform 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 Inferse?
Agenta is ranked #1 of 29 with a score of 7.4. Promptitude is second and PromptWizard third.
How many of these have a free plan?
13 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 on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.