Reply Boy vs JustComment AI
Side-by-side comparison · Updated April 2026
| Description | Reply Boy is a Chrome Extension designed specifically to boost engagement on Twitter by replying to popular tweets. The process is simple and secure with no need for your Twitter password. Just define the type of reply (e.g., question, affirmation) and choose a mood (e.g., romantic, funny, clever) to start growing your Twitter account effortlessly. Reply Boy ensures privacy by not tracking user data or logging messages. | Just Comment is an innovative tool designed to assist users in creating engaging and personalized comments on various social media platforms. Utilizing AI, it helps tailor responses and reactions, ensuring they are relevant and thought-provoking. With slash commands, users can customize their comments for specific needs, whether it's to maintain a certain tone, style, or relevance to a topic. Available as a Chrome extension, it currently supports Twitter and LinkedIn with plans to expand to other platforms soon. |
| Category | Social Media | Social Media |
| Rating | No reviews | No reviews |
| Pricing | Free | Freemium |
| Starting Price | Free | Free |
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| Tags | Chrome ExtensionTwitterSocial MediaEngagementAutomation | social mediaAIcommentscustomizationChrome extension |
| Features | ||
| Chrome Extension | ||
| Boosts Twitter engagement | ||
| No user data tracked | ||
| No Twitter password required | ||
| Defines types of replies | ||
| Various reply moods | ||
| Increases Twitter impressions | ||
| Adheres to Twitter rules | ||
| Free trial available | ||
| Privacy-first design | ||
| AI-generated comments | ||
| Slash command customization | ||
| Support for various social media platforms | ||
| Personalized reactions | ||
| Multi-language support | ||
| Pay-as-you-go credit system | ||
| Free trial with 50 credits | ||
| No subscription required | ||
| Custom emojis and instructions | ||
| View Reply Boy | View JustComment AI | |