Specifiction
For vendors
AdvertiseTop spots, featured rows, home sponsor Get listedAdd a product we don't cover yet Claim a listingFree: verify the domain, then correct your page Vendor dashboardNumbers, orders and placements
List your tool
Vendor dashboard
Tech riderRev. 21 Sept 2026

GEPAzilla

Ch 166.3of 29 AI Prompt Generators
  1. 1Runs onAPI, self-hosted, Web
  2. 2CostsNot stated by the maker
  3. 3Model supportmultiple
  4. 4Optimization modeautomated
  5. 5Prompt testingYes
4 lines stated Written from the maker's own pages: gepazilla.com
Visit site Alternatives
The GEPAzilla homepage

Overview

GEPAzilla is ranked #16 of 29 in AI prompt generators on Specifiction. It runs on API, Self-hosted, Web.

Compared on AI prompt generators

Model support
multiplegepazilla.com
Optimization mode
automatedgepazilla.com
Prompt testing
Yesgepazilla.com

Facts

Purpose
GEPAzilla is an open-source GEPA prompt optimizer that iterates on system prompts using datasets and scorers.gepazilla.com · 4 Oct 2026
Dataset input
You can load your own dataset or start with the included sample dataset.gepazilla.com · 4 Oct 2026
Scoring
It supports combining deterministic checks with LLM judges, with configurable scorer weights and duplicates.gepazilla.com · 4 Oct 2026
Telemetry
The maker says run telemetry stays on your machine and includes tokens, routing, costs, and errors.gepazilla.com · 4 Oct 2026
Validation
Validation rows are kept out of reflection and used to rank candidate prompts on the Pareto frontier.gepazilla.com · 4 Oct 2026
Diagnostics
Results include scorer failure rates, averages, and common notes, alongside candidate prompts and iteration trends.github.com · 4 Oct 2026
Model access
The project requires users to supply an AI Gateway API key for GEPA runs, scorer previews, and model discovery; its README specifies Vercel AI Gateway.github.com · 4 Oct 2026
Data handling
The README says telemetry events are not sent to a remote service and run data is not exfiltrated.github.com · 4 Oct 2026
Data import limit
Dataset tools currently support copying or pasting JSON payloads from the clipboard.github.com · 4 Oct 2026
Deployment
The project is a standard Next.js application that can be built and started with pnpm.github.com · 4 Oct 2026
License
The project is released under the MIT License.github.com · 4 Oct 2026
Intended users
The maker describes the console as a way for curious builders to experiment with prompt optimization using their own API key.github.com · 4 Oct 2026

Best GEPAzilla alternatives

See all 20
All accessCh 01 Vellum Free planAndroidBrowser from $30/mo7.6 All accessCh 02 PromptWizard Free planAPILinux Free to start7.5 All accessCh 03 Promptitude Free planFree trialAPI from $39/mo7.4 All accessCh 04 Google Cloud Agent Evaluation Free trialAPIWeb 7.2 All accessCh 05 VantagePrompt Free planWeb from $3/mo7.1 All accessCh 06 Agenta Free planAPIself-hosted from $29/mo7.0

Where it ranks on Specifiction

Is GEPAzilla yours?

Claim it for free: prove the domain, then correct facts, plans and screenshots. An editor reviews every change.

Claim it free Promote GEPAzilla

Sources