Sider (sider.ai) is the AI productivity extension that placed #3 on Product Hunt's 2025 annual leaderboard with 1,375 upvotes. It surfaces a persistent AI sidebar on any webpage, document, or video — giving instant access to GPT-4o, Claude Sonnet, Gemini Pro, DeepSeek-R1, and 20+ other models without switching tabs or opening separate apps. With 4 million active users and 32,000+ five-star ratings, it has become the dominant AI browser extension for professionals who work across multiple AI models.
What Is Sider?
Sider's core premise is that the best AI assistant is the one you do not have to switch to. Rather than opening ChatGPT, Claude, and Gemini in separate tabs and re-pasting context between them, Sider brings all of these models into a sidebar that persists across every website, PDF, YouTube video, and document you work with. The sidebar reads the current page's content as context, enabling AI assistance — summarisation, translation, writing, analysis — grounded in exactly what is on screen.
The 5.0 release that drove the Product Hunt ranking introduced Wisebase: a personal AI knowledge base where users save highlights, notes, and research findings across sessions, then use AI to synthesise and generate content from their accumulated knowledge rather than starting from scratch each time.
Key Features
- Multi-model access in one sidebar — GPT-4o, Claude Sonnet, Gemini Pro, DeepSeek-R1, o3-mini, Llama 3.1 405B, and 15+ additional models accessible from a single interface with one-click switching
- Page-aware context — Sider reads the active webpage, PDF, or YouTube transcript as context for all AI interactions — no manual copy-paste required
- Deep Research Agent — Multi-step research agent that searches 100+ sources, synthesises findings, and produces cited reports without leaving the browser
- Wisebase knowledge base — Save highlights, notes, and AI-generated insights across sessions into a searchable personal knowledge base; use AI to create content from accumulated research
- PDF and file chat — Chat with uploaded PDFs, Word documents, and spreadsheets; ask questions, extract data, and generate summaries
- AI image generation — Generate and edit images without leaving the sidebar
- Real-time translation — Translate any selected text or entire pages; described by users as significantly more accurate than Google Translate for professional contexts
- Group Chat — Query multiple AI models simultaneously and compare responses side by side
Pricing
Source: sider.ai/pricing, verified March 2026.
- Free — 30 basic credits/day; access to basic models (GPT-4o mini, Claude Haiku, Gemini Flash); core sidebar features
- Starter — ~$5/month — 1,800 basic credits/month; 100 advanced credits/month (GPT-4o, Claude Sonnet, Gemini Pro)
- Basic — $8.30/month — 3,600 basic credits/month; 100 advanced credits; full feature access including Deep Research and Wisebase
- Pro — ~$20/month — 12,000 basic credits/month; 300-400 advanced credits; priority access
- Unlimited — ~$25-30/month — Unlimited basic credits; 1,000+ guaranteed advanced credits/month; all features
Sider vs Perplexity vs ChatGPT
Sider, Perplexity, and ChatGPT are not direct substitutes — they serve different workflow positions. ChatGPT is a destination: you open it intentionally to start a task. Perplexity is a search replacement: you query it for real-time web research with citations. Sider is ambient: it is present wherever you are working, grounding AI assistance in the content already on your screen. The multi-model access is Sider's clearest advantage over both — users who want to compare GPT-4o and Claude's responses to the same question without maintaining two separate subscriptions find Sider more cost-effective. The credit-based pricing model is the most common user frustration — advanced model credits deplete faster than the monthly allocation for heavy users.
Pros & Cons
Pros:
- 4 million active users and 32,000+ five-star ratings — the most validated AI browser extension available
- Access to 20+ AI models in one subscription — eliminates the need for multiple separate AI subscriptions
- Deep Research Agent produces cited multi-source reports without tab switching
- Wisebase knowledge accumulation across sessions is a genuine productivity differentiator
Cons:
- Advanced model credits (GPT-4o, Claude Sonnet) deplete quickly on complex tasks — heavy users report mid-month credit exhaustion on lower tiers
- Some users report that "Unlimited" plan descriptions are misleading — credits are capped and not truly unlimited per community feedback
- No conversation folders or organisation — chat history management is a commonly cited limitation
- Customer support response times receive consistent negative reviews from paid subscribers
Who Should Use Sider?
Sider is the right tool for professionals who work with multiple AI models across research, writing, translation, and analysis — and who want those tools present in their browser workflow rather than as separate destinations. The free tier is a functional starting point. The Basic plan at $8.30/month is the best entry for users who need advanced models (GPT-4o, Claude Sonnet) regularly. Users who primarily need a single AI model and strong conversation organisation should compare ChatGPT Plus directly — Sider's value is multi-model breadth, not single-model depth.
Bottom Line
Sider is the most widely adopted AI browser extension in 2026, delivering multi-model AI access at a price point significantly below maintaining separate subscriptions for each model. The #3 Product Hunt 2025 ranking and 4 million active users confirm broad professional adoption. The credit system and customer support are the two friction points that more demanding users should evaluate before committing to higher tiers.
