Sider: ChatGPT Sidebar + GPTs & GPT-4 Turbo

Sider is a browser extension that functions as a multi-model AI aggregator, embedding ChatGPT, Claude, and Bard into a sidebar that lives alongside your daily web browsing. Rather than positioning itself as a standalone writing tool, Sider is designed for users who want to compare outputs from different large language models, access real-time web data, and perform common AI tasks like summarization, translation, and image generation without leaving the current tab. It is particularly suited for power users who need to evaluate model behavior, researchers who rely on quick article or video summaries, and writers who want to improve drafts or generate ideas while working in Gmail or Google Docs.

Where Sider stands out is in its multi-model group chat feature. This allows you to send the same prompt to ChatGPT, Claude, and Bard simultaneously and view their responses side by side in real time. For anyone who has ever wondered which model gives a more concise summary, a more creative headline, or a more accurate answer, this capability eliminates the need to manually switch between tabs or copy-paste prompts. The comparison is immediate and visual, making it easier to pick the best output or to understand how different models approach the same question. This is especially valuable for developers testing prompt variations, content creators refining tone, or students verifying facts across sources.

Beyond group chat, Sider offers practical integrations that reduce friction in everyday workflows. When you search on Google or Bing, the extension can augment results with AI-generated answers, pulling from both the web and the model's knowledge. In Gmail, it can help draft replies, rephrase sentences, or adjust tone. On YouTube, it can summarize long videos into bullet points or key takeaways. These enhancements are not revolutionary on their own, but their convenience lies in being available without leaving the page. The real-time web access feature also helps ground AI responses in current information, which is critical for tasks like researching recent events or checking live data.

However, Sider is not without limitations. It relies entirely on third-party AI APIs; there is no proprietary model, so the quality of responses depends on the underlying services. The free tier may impose usage caps, and pricing beyond that is not clearly disclosed, which can be a concern for heavy users. The extension's performance can also vary; with multiple models running simultaneously or when processing large files, it may feel sluggish. Additionally, some advanced features, like prompt management and file chatting, are functional but not as polished as dedicated tools. Chatting with PDFs or images works for extracting text or basic Q&A, but it may struggle with complex layouts or nuanced visual analysis.

Sider fits best into workflows that require frequent switching between AI tasks and web browsing. For a student researching a topic, it can summarize a long article and answer follow-up questions without leaving the page. For a content creator, it allows quick A/B testing of copy across models. For a marketing professional, it can draft email campaigns, check tone, and pull real-time data for context. The extension is also available on Edge and Safari, plus mobile apps for iOS and Android, which broadens its reach beyond Chrome.

A practical buyer should consider Sider as a productivity layer rather than a primary AI tool. It excels when you need to compare models or access AI assistance quickly across different sites. But if your work demands deep, focused writing or advanced file analysis, you may still need a dedicated editor or a specialized document AI. The key decision criteria are: how often do you switch between AI models? How important is real-time web access? And are you comfortable with potential usage limits? For users who answer 'often' and 'very,' Sider offers a convenient, multi-model sidecar that can streamline daily tasks without overhauling your browser habits.