# factfully vs Second Opinion

factfully records 0 monthly visits with — month-over-month growth and Contact for Pricing pricing. Second Opinion records 0 monthly visits with 0% growth and Freemium pricing.

| Metric | [factfully](https://openaitools.app/tool/factfully) | [Second Opinion](https://openaitools.app/tool/second-opinion) |
| :--- | :--- | :--- |
| Website URL | https://chromewebstore.google.com/detail/factfully/lnapbpfojpeppgmmiabomcnidnlgnlni | https://secondopinion.so |
| Categories | AI Checker, AI Content Detector, AI Text Classifier, AI Detector | AI Checker, AI API, AI Copilot, Large Language Models (LLMs) |
| Pricing Model | Contact for Pricing | Freemium |
| Monthly Visits | 0 | 0 |
| MoM Growth Rate | — | 0% |
| Primary Market | Global | Global |
| Direct Visits | 0 | 0 |
| Review Score | 3.2 | 3.9 |
| Saved Count | 0 | 0 |
| Supported Platforms | Browser Extension | Website |

## factfully

factfully is a Chrome extension designed to combat the spread of fake news with automated AI analysis. Instead of relying only on human fact-checkers, it uses trained algorithms to assess whether content on the internet is likely true and, when something looks false, to help surface what lies behind the claim. The extension is intended for readers who want a faster read on the credibility of news and social media posts.

The checking process works in stages. First, a neural network ranks a statement across several metrics, such as sensationalism, testability, and political bias, to pre-evaluate whether it seems true. Next, a tokenization algorithm strips away filler and identifies which parts can be objectively fact-checked versus which are subjective opinion. Finally, the system scans thousands of websites across the web to see whether the statement has been corroborated elsewhere.

factfully is distributed through the Chrome Web Store as a browser extension, and its developer has stated that other platforms are planned. Because misinformation detection is probabilistic, results should be treated as one signal among several rather than a final verdict, and users can review the listing's privacy disclosures before installing.

**Pricing & Plans:** Distributed through the Chrome Web Store. See the extension listing for current availability and any pricing details.

- **AI misinformation scoring:** Ranks statements across metrics such as sensationalism, testability, and political bias to flag likely false content.
- **Fact vs. opinion split:** Tokenization separates objectively checkable claims from subjective opinions before verification.
- **Multi-source corroboration:** Scans thousands of websites to see whether a statement is backed by other sources.
- **Runs in your browser:** Delivered as a Chrome extension so checks sit alongside the content you are reading.

**Strengths:** Automates an initial credibility check on news and posts; Breaks analysis into bias, testability, and corroboration steps; Runs directly in the browser alongside the content

**Limitations:** AI verdicts are probabilistic, not definitive; Limited to a Chrome extension at present; Only 2 ratings on the store reflect a small user base

[Profile (Markdown)](https://openaitools.app/tool/factfully.md)

## Second Opinion

Second Opinion turns fact-checking into a right-click action. Instead of opening a new tab, pasting a claim into a chatbot, and rewording your question, you highlight text on a news article, social post, or research page and select "Get Second Opinion" from the context menu. The extension then returns a structured analysis in place, which keeps you inside the reading flow rather than breaking it.

The analysis is deliberately multi-angle. It checks accuracy of the specific claims, flags possible bias or loaded framing, and offers alternative perspectives so you can see how the same facts might be presented differently. The extension itself is free to install and use, and connects to Grok through your own API key, meaning you pay only for the token usage you actually generate rather than a subscription fee.

Because the output is generated by a language model, the developer is explicit that results should be cross-referenced with other reliable sources for high-stakes decisions. It is best understood as a fast first-pass sanity check that surfaces questions worth asking, not a final authority on what is true.

**Pricing & Plans:** 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.

- **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.
- **Payload-based pricing via your own key:** The extension is free; you connect your own Grok API key and pay only for the tokens each check consumes.

**Strengths:** 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

**Limitations:** Requires your own Grok API key, which adds a setup step for non-technical users; Costs scale with how much you check, since billing is per token; Output is model-generated and can itself be wrong, so important claims still need primary-source review; Not yet available on Firefox or Safari

[Profile (Markdown)](https://openaitools.app/tool/second-opinion.md)

## Frequently Asked Questions

### How do factfully and Second Opinion compare in monthly traffic?

factfully has 0 monthly visits, while Second Opinion has 0. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

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

### How does pricing compare?

factfully: Contact for Pricing. Distributed through the Chrome Web Store. See the extension listing for current availability and any pricing details. 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.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [GPTZero](https://openaitools.app/tool/gptzero-me) | 23,246,989 | +32.5% | Freemium, Paid | AI detection and writing verification built for schools and editors | [.md](https://openaitools.app/tool/gptzero-me.md) |
| 2 | [Sider](https://openaitools.app/tool/sider) | 2,644,740 | -10.6% | Freemium | AI sidebar and browser agent for reading, writing and research | [.md](https://openaitools.app/tool/sider.md) |
| 3 | [Grokipedia](https://openaitools.app/tool/grokipedia) | 1,728,388 | +6.9% | Free | An open, AI-written encyclopedia built and fact-checked by Grok | [.md](https://openaitools.app/tool/grokipedia.md) |
| 4 | [Isgen AI Detector](https://openaitools.app/tool/isgen-ai) | 901,917 | +5.8% | Freemium | Multilingual AI detector with sentence-level insight | [.md](https://openaitools.app/tool/isgen-ai.md) |
| 5 | [HARPA AI](https://openaitools.app/tool/harpa-ai) | 537,461 | +99.3% | Freemium | One browser agent that combines every major AI model with web automation | [.md](https://openaitools.app/tool/harpa-ai.md) |
| 6 | [MyDetector](https://openaitools.app/tool/mydetector) | 534,478 | +1.1% | Free | Free AI detector with sentence-level insight and a humanizer | [.md](https://openaitools.app/tool/mydetector.md) |
| 7 | [Detecting-AI.com](https://openaitools.app/tool/detecting-ai-com) | 505,146 | +493% | Freemium, Paid | AI detector that highlights evidence, not just a score | [.md](https://openaitools.app/tool/detecting-ai-com.md) |
| 8 | [ZeroGPT Plus](https://openaitools.app/tool/zerogpt-plus) | 134,635 | +21% | Freemium | Free AI detector with sentence-level reports for ChatGPT, Gemini & Claude text | [.md](https://openaitools.app/tool/zerogpt-plus.md) |
| 9 | [Dechecker](https://openaitools.app/tool/dechecker) | 111,347 | +4.2% | Freemium | Free AI content detector that flags machine-written text and helps you rewrite it | [.md](https://openaitools.app/tool/dechecker.md) |
| 10 | [AI Detector Writer](https://openaitools.app/tool/ai-detector-writer) | 111,129 | +41.6% | Free | Free, unlimited AI content detection with sentence-level scoring | [.md](https://openaitools.app/tool/ai-detector-writer.md) |

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Source: https://openaitools.app/compare/factfully-vs-second-opinion

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