PromptPerf
Instantly test and compare AI prompts results across models
Free10,756 impressions#2 of its week1 comment
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>log in to commentAs an AI developer, I spend a lot of time running prompts across different models and configs, tweaking temperature, comparing outputs, and manually checking which one gets it right. It’s repetitive. Time-consuming. And easy to mess up. So I built PromptPerf -> a tool that tests a single prompt across GPT-4o, GPT-4, and GPT-3.5, runs it multiple times, and compares the results to your expected output using similarity scoring. ⚡ No more guessing which prompt or model is better ⚡ No more switching between tabs ⚡ Just clean, fast feedback and a CSV if you want it This started as a scratch-my-own-itch tool, but now I’m opening it up to anyone building with LLMs. Unlimited free runs. More models coming soon. Feedback shapes the roadmap. Would love to hear what you think! Keen on feedback and help to ensure I build a product that solves your problems 👉 promptperf.dev
PromptPerf lets you test and compare AI prompts across dozens of models with similarity scoring.
- for
- Prompt engineers, AI product teams, and developers building AI-powered features.
- pricing
- freemium
Key features
- Cross-model testing — Run a prompt on 100+ AI models and see which returns the best match.
- Similarity scoring — Compare each model's output to an expected answer using a match percentage.
- Cost-effectiveness analysis — Identify cheaper models that perform as well as premium ones.
- Version monitoring — Save tests and re-run them to detect regressions after model updates.
- No code required — Paste prompts in a web UI; no API keys or programming needed.
- Exportable results — Download test history and scores for reporting or automation.
- API key included — Paid plans provide an API key for programmatic access.
- Team features (2026) — Lifetime plan adds collaboration tools and advanced analytics.
Use cases
- Choose the cheapest model that still meets quality requirements for a support-ticket summarizer.
- Validate that a sales-assistant prompt works consistently across model updates.
- Benchmark multiple prompts to select the best one for a chatbot before deployment.
PromptPerf pricing
- Monthly$9/monthUnlimited test cases · 100+ AI models · API key included · Email support
- Annual$79/yearAll Monthly features · Priority email support · Early access to new features · Save $29/year
- Lifetime$199All Annual features · All future updates free · Priority support forever · Founding member badge
- FreeFree5 test cases per evaluation · Unlimited runs · Access to free models
PromptPerf FAQ
Do I need to write code to use PromptPerf?+
No, the web UI lets you paste prompts and view results without any coding or API setup.
How many models can I test with the free tier?+
The free account gives unlimited runs on free models and 5 test cases per evaluation.
Can I monitor prompt performance over time?+
Yes, you can save tests and re-run them anytime to see how updates to models affect your prompts.
What payment options are available?+
Monthly ($9), annual ($79) and a one-time lifetime plan ($199) with a 50% discount code for the lifetime offer.
Is there priority support for paid users?+
Paid plans include priority email support, with lifetime members receiving it forever.
Can I use PromptPerf via an API?+
Paid plans include an API key that lets you integrate testing into your own workflows.
Summarized by DevHunt from promptperf.dev · Oct 4, 2026. Details may change; check the official site.
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