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Free forever for diagram building

Teach your students to think in arguments

Your students build Toulmin diagrams, work through arguments with an AI coach, and analyze real texts. They do the reasoning. The AI asks questions.

Get Started Free For Institutions

Toulmin Lab diagram builder with a live Toulmin argument on scriptural authority

Built for higher education

No credit card required

AI that teaches, never writes

English & Spanish

Three ways to master argumentation

Build from scratch, learn with AI guidance, or analyze real texts. Pick the mode that fits your lesson.

BUILD

Construct arguments from scratch

Name your claim, grounds, warrant, backing, qualifier, and rebuttal. The diagram updates as you type.

Guided form walks you through each component
Live diagram preview updates in real time
Export finished arguments as PNG, JPG, or PDF

Manual diagram builder with a form on the left and a live full Toulmin diagram on the right

DEVELOP

An AI coach that asks the right questions

The AI coach asks Socratic questions about each part of your argument. You write the claim, the grounds, the warrant. The coach points out what's missing.

Step-by-step guidance through all Toulmin components
Proposes improvements only when you're ready
Evaluates your finished argument with detailed feedback

AI Coach chat walking a student through a claim with a step bar and live argument diagram

ANALYZE

Deconstruct any text through a Toulmin lens

Paste an article or legal opinion. The AI helps you find the claim, grounds, and warrant in the text. Label each passage and build the diagram as you read.

Highlight text passages that map to Toulmin components
Progressive diagram builds as you identify parts
Save your analysis as a complete Toulmin argument

Analysis Mode three-panel layout with source text, AI guide, and an emerging Toulmin diagram

AI that asks questions

Most AI tools hand students the answer. Toulmin Lab's coach asks them to find it.

Socratic guidance

You state your claim. The coach asks what evidence you have and why it matters. One question at a time, you build the full argument.

Smart proposals

The coach waits until your argument holds together before suggesting edits. You accept, reject, or rewrite each one.

Detailed evaluation

Submit your finished argument for a scored evaluation. You get ratings on each Toulmin component with written feedback on what to revise.

Built for the disciplines that teach argumentation

Theology & Seminary

From claim to scripture

Link evidence to scripture with source citations. The extended Toulmin model adds a Source Citation field for verse-level references.

Philosophy & Rhetoric

The Toulmin model, modernized

The framework is in your curriculum. Now your students have a tool to practice building and evaluating arguments with AI guidance.

Law

Structure legal reasoning

Legal arguments follow a natural Toulmin structure. Students practice building and deconstructing cases with warrant-based reasoning.

Communication & Writing

From persuasive essays to debate prep

Students who practice structured argumentation write and speak more clearly. The diagram gives them a visual map of their reasoning.

Run your department on Toulmin Lab

Create classes, track student progress, and brand the space with your logo and colors.

Institution Spaces

Your own branded environment with custom colors and logo

Groups & Classes

Organize students into cohorts with teacher oversight

Roles & Permissions

Admin, teacher, and student access levels built in

Progress Insights

Track how your students improve over time

Get in Touch See Pricing

Institution dashboard showing argument counts, groups, and student work at Grand Rapids Theological Seminary

The team behind Toulmin Lab

We built Toulmin Lab because the tools for teaching argumentation hadn't changed in twenty years. We wanted a modern platform where AI coaches students through their own reasoning.