Mistral OCR Playground for OCR Testing

A Mistral OCR Playground for OCR Testing OCR playground is a UI to test OCR prompts and run evals on text extracted from images/documents using Mistral OCR Playground for OCR Testing—focused on accuracy, formatting, and repeatability.

Prompt testing and evaluations for OCR: clean extraction, layout preservation, tables, multilingual text, and structured outputs—without building a document pipeline first.

Yes. Bring your API keys. LangFast routes requests through our proxy.

To prevent abuse, apply fair-use limits, and let you save runs, reuse the same documents for regression tests, and share results.

Extraction accuracy, missing text, hallucinated text, line breaks, punctuation, and whether the output matches the original structure.

Yes. Evaluate paragraphs, headers, bullet lists, and page structure. OCR isn’t just “get text”—it’s “get usable text.”

Yes. Test whether tables are preserved as tables (or clean CSV/JSON), and whether key-value fields are extracted reliably.

Yes. Use the same document set across languages and compare accuracy and formatting consistency.

Yes. Reuse a fixed document set and rerun after prompt changes to see if extraction quality improves or regresses.

Yes. Run the same documents side-by-side and compare accuracy, formatting, and speed.

Yes. For invoices, receipts, IDs, and forms, use eval prompts that enforce a schema and measure how often the model violates it.

Yes—export to cURL/JS/JSON so your team can reproduce the exact call and parameters.

Yes. Save transcripts, keep prompt versions, and share links for review or sign-off.

LangFast is free to use with some basic features. You need to provide your own API keys to run models and use the app. When you add your API keys, you pay the model provider (e.g., OpenAI) for the credits/tokens you use. LangFast premium features can be unlocked with a one-time purchase.

Wait for reset or add paid usage to continue running OCR evals.

We stream responses via a lightweight proxy. OCR speed depends on document size, model load, and extraction complexity.

No. We don’t train on your prompts or files. Sharing is opt-in and retention is configurable.

Requests route to model providers. See the Data & Privacy page for processing regions and details.

LangChain helps you build document workflows. LangFast helps you test OCR prompts and evaluate extraction results before you implement pipelines.

Those tools manage datasets, evals, and tracing inside pipelines. LangFast is an interactive bench for OCR prompt testing and quick model comparisons.