PromptLens vs Stax
Stax is Google's AI evaluation platform with managed evaluators and datasets, but it's only available in a handful of countries. PromptLens works worldwide — no Google account needed, transparent pricing, and shareable reports from day one.
What sets PromptLens apart
Available worldwide
No Google account needed
Shareable report links
How we stack up
A side-by-side look at PromptLens and Stax.
| Feature | PromptLens | Stax |
|---|---|---|
| Available worldwide | Limited regions | |
| No Google account needed | ||
| Shareable report links | ||
| Transparent pricing | From $0 | Not listed |
| Web-based UI | ||
| Multi-model comparison | ||
| Custom evaluators | ||
| Dataset management | ||
| Pre-built evaluators | ||
| Pass/fail scoring | ||
| Latency & token tracking | ||
| LLM-generated datasets | ||
| Image input support | Coming soon |
Available worldwide
No Google account needed
Shareable report links
Transparent pricing
Web-based UI
Multi-model comparison
Custom evaluators
Dataset management
Pre-built evaluators
Pass/fail scoring
Latency & token tracking
LLM-generated datasets
Image input support
A closer look
Setup & Access
How quickly can your team start running evaluations?
Sign up with any email, paste your prompt, add test cases, and run. No Google account needed, no vendor lock-in. Your first evaluation runs in under 5 minutes.
Sign in with a Google account and access the Stax web platform. Import or generate datasets, configure evaluators, and run experiments through the dashboard.
Team Collaboration
How do non-technical team members participate in prompt QA?
Generate shareable report links for PRs, Slack, or stakeholder reviews. Anyone can view results without an account or technical setup.
Team members need a Google account to access the Stax platform. Collaboration happens within the Stax dashboard — no public sharing links for external stakeholders.
Pricing & Independence
What does it cost and how tied are you to the platform?
Free tier with 3 projects and 50 evaluations/month. Pro at $99/month. Live evaluations use organization-owned provider keys with explicit model routes.
Stax does not publicly list pricing and is only available in a handful of countries. The platform is tied to Google's ecosystem and requires Google sign-in.
Frequently asked questions
Ready to switch from Stax?
Start testing your prompts in minutes. No credit card required, no complex setup.