How do their growth rates compare?

Second Opinion has a month-over-month growth rate of 0%; Truth Keeper has —.

How does pricing compare?

Second Opinion: Freemium. The extension is free to install and use. You supply your own Grok API key, so you pay only for token usage per check. No subscription fees or hidden costs for the extension itself. Truth Keeper: Free. Free to install from the Chrome Web Store; no paid tiers are advertised.

What are alternatives to Second Opinion and Truth Keeper?

Other tools in related categories include ZeroGPT, GPTZero, Sider, Originality.ai, Grokipedia.

Second Opinion vs Truth Keeper — Traffic (0 vs 0), Pricing & Verdict

Open AI Tools

Second Opinion vs Truth Keeper — Traffic (0 vs 0), Pricing & Verdict | Open AI Tools

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	Second Opinion	Truth Keeper
Official Domain	secondopinion.so	chromewebstore.google.com
Pricing Model	Freemium	Free
Monthly Visits	0 (0)	0 (0)
MoM Traffic Delta	0 (0%)	0 (—)
Primary Market & Share	🌐 Global (—)	🌐 Global (—)
Direct Visits / mo	0	0
User Rating	3.9	3.1
Supported Platforms	Website	Browser Extension

Second Opinion

Fact-check and bias-check any text while you browse

Right-click fact-checking

Highlight any passage on a website, social platform, or news article and choose Get Second Opinion to receive an analysis without leaving the page.

Accuracy verification

The model assesses the specific claims in the highlighted text and flags statements that appear unsupported or misleading.

Bias and framing detection

Beyond true or false, it points out loaded wording, one-sided framing, and rhetorical choices that shape interpretation.

Alternative perspectives

Each check surfaces opposing viewpoints and context, so you can compare how the same facts are presented elsewhere.

Strengths & Pros

+Works inline through a right-click, so verification does not break your reading flow
+Goes beyond true or false to flag bias, framing, and missing perspectives
+Free extension with pay-only-for-usage token costs through your own API key
+Available on Brave, Edge, and other Chromium browsers as well as Chrome