Install free
Smart Fill
Detect common field types and generate values that respect constraints such as dates, limits, and text length.
Fill forms faster. Keep control.
Lero Lero turns repetitive form testing into a quick, repeatable workflow with Smart Fill, reusable site profiles, coherent local test data, and advanced Pro automation when you need it.
No account required for Free
Local-first workflow
Pro unlocks advanced workflows
Built for repetitive testing
Useful defaults without getting in your way.
Use the extension quickly on a new page, then save the rules that matter when you need repeatability.
Profiles & templates
Save reusable behavior by site or URL, configure fields visually, and combine generators, fixed values, templates, and skip rules.
Private by design
The core form-filling workflow stays local-first. Profiles and generated form values are not sent to the licensing backend.
Lero Lero Pro
More control when your test workflow gets serious.
Pro extends the same local-first extension with advanced matching, dependency-aware filling, guided workflows, and optional AI providers you control.
Advanced profile matching
Use unlimited profiles with glob/path rules, validated regular expressions, query-string conditions, priorities, and profile duplication.
Advanced templates
Reference other fields and use deterministic conditionals to build richer test data without arbitrary JavaScript execution.
Field dependencies
Define field relationships with cycle validation, deterministic ordering, fallback behavior, and optional dependent regeneration.
Guided Fill
Move through a form field by field with highlighting, keyboard navigation, skip/next/previous controls, and contextual fill actions.
Bring your own AI
Optionally connect local Ollama, Google Gemini, or an HTTPS OpenAI-compatible provider using your own credentials and selected model.
Local credential storage
BYOK API keys stay in the extension’s private local secret storage, separate from profiles, exports, and the Lero licensing backend.
Free vs Pro
Choose the workflow that fits your testing.
Free covers the everyday form-filling workflow. Pro keeps everything in Free and adds higher-volume profiles, advanced automation, Guided Fill, and optional BYOK AI.
Free
Start immediately
Smart Fill, local generators, visual profile editing, templates, and up to three reusable profiles — no account required.
Install FreePro
Unlock the advanced workflow
Everything in Free plus unlimited profiles, advanced matching and templates, field dependencies, Guided Fill, and optional BYOK AI providers.
Create account for Pro| Feature | Free Everyday testing | Pro Advanced workflows |
|---|---|---|
| Core form filling | ||
| Smart Fill | ||
| Local fictitious-data generators | ||
| Template variables, relative dates & random values | ||
| Visual field picker & Profile Editor | ||
| Local JSON backup & restore | ||
| Profiles & automation | ||
| Saved profiles | Up to 3 | Unlimited |
| URL matching | Origin, prefix & exact | Glob/path, regex & query rules |
| Profile priority & duplication | — | |
| Cross-field template references & conditionals | — | |
| Field dependencies & deterministic fill ordering | — | |
| Guided Fill | — | |
| Optional AI providers | ||
| Ollama local | — | |
| Google Gemini BYOK | — | |
| OpenAI-compatible HTTPS provider | — | |
| Private local BYOK credential storage | — | |
| Privacy & product model | ||
| Local-first form-filling workflow | ||
| Form contents sent to Lero licensing backend | Never | Never |
AI providers are optional. Remote AI requests use the provider selected by the user and do not pass through the Lero licensing backend.
Make repetitive forms less repetitive.
Start with Free today. Move to Pro when you need deeper automation and larger workflows.