Purpose vs Sider

SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.

SpecialistAnthropic's frontier AI workspace powered by Claude 5.5 for agentic coding, analysis, and nuanced writing.

Offers a very similar browser sidebar experience with multiple AI models, but features slightly different pricing and workspace tools.

Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.

Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.

Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser

Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.

Delivers streamlined inline writing and webpage summarization via a browser extension, but with fewer custom sidebar tools.

Offers guided AI journaling and emotional check-ins, ideal for users seeking structured personal reflection and growth.

SpecialistBroad lifestyle agent with deep memory for routines and habits, though less centered purely on guided coaching.

Provides private AI journaling and reflective personal growth coaching, matching Purpose's focus on mindfulness and self-improvement.

One AI sidebar for ChatGPT, Claude and Gemini across the web