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Comparison · 2026
CheckforAi vs Second Opinion Extension
CheckforAi vs Second Opinion Extension: side-by-side comparison of pricing, ratings, and features on SoftwareVital (2026).
Feature lists share 0 overlapping items across the two listings.
free
Free tool that detected AI-generated text in essays and emails using both OpenAI's models and proprietary detection technology.
VS
free
Second Opinion Extension is a free browser extension that fact-checks selected web text with Grok AI to flag inaccuracies and bias.
Side-by-side
| Attribute | CheckforAi | Second Opinion Extension |
|---|---|---|
| Rating | — | — |
| Reviews | — | — |
| Pricing | free | free |
| Votes | 0 | 0 |
| Category | AI Checker | AI API |
Features checklist
| Feature | CheckforAi | Second Opinion Extension |
|---|---|---|
| CheckforAi was a free nonprofit project designed to detect AI-written text in essays and emails | ||
| Free to install and use | ||
| Easy to use with a simple right-click action | ||
| Provides quick fact-checks | ||
| Supports multiple browsers | ||
| Requires a Grok API key | ||
| which incurs token usage costs | ||
| Accuracy depends on Grok AI | ||
| so verification from multiple sources is still recommended |