---
title: See Which Source Actually Backs Each Claim — Free
description: List each claim with the kind of source behind it and the matrix shows where your evidence is thin, so an unsourced claim is a visible cell rather than a sentence you have stopped noticing.
category: learning
last_verified: 2026-09-13
freshness: green
published: 2026-09-13
canonical_url: https://gratis-ai.pages.dev/articles/citation-source-matrix-2.html
companion_app_url: https://gratis-ai.pages.dev/apps/citation-source-matrix-2.html
reading_time_minutes: 5
tags: learning, citation-source-matrix
---

# See Which Source Actually Backs Each Claim — Free

List each claim with the kind of source behind it and the matrix shows where your evidence is thin, so an unsourced claim is a visible cell rather than a sentence you have stopped noticing.

**Free and complete.** This guide is a standalone free tool — no account, no card, anywhere. The only paid option is one optional extra outcome: $4 one-time. Nothing in the free tier is gated.

## Who it's for

Anyone seeking practical 100% free AI workflows — no paid API keys, credit cards, or subscriptions

## What's free

- Any number of claims cross-tabbed
- Empty cells surfaced rather than smoothed
- Copy the matrix as text
- Stateful link to any result

## Optional paid add-on

**$4 one-time.**

- Printable grid with the empty cells boxed for a supervisor meeting — estimate: 15 minutes saved per draft, basis: 4 claims re-tabbled at ~3.75 minutes each
- Saved local history across drafts — estimate: 10 minutes saved per draft, basis: re-entering 4 claims at ~2.5 minutes each

## Sources & verification

- Tool: GratisAI local-first workflow (no key, no account)
- Primary source: https://notebooklm.google/ — checked 2026-09-13
- Last verification: 2026-09-13 (green)

## Use it

- Interactive guide: https://gratis-ai.pages.dev/articles/citation-source-matrix-2.html
- Companion app: https://gratis-ai.pages.dev/apps/citation-source-matrix-2.html
- This machine-readable mirror: /mirrors/citation-source-matrix-2.md

*Generated free at https://gratis-ai.pages.dev/articles/citation-source-matrix-2.html — every guide on GratisAI is a complete, working tool. $0, no account, no card, anywhere.*