Capacities records 339,396 monthly visits with +5.7% month-over-month growth and Freemium, Paid pricing. Sider records 2,644,740 monthly visits with -10.6% growth and Freemium pricing.
A studio for your mind: object-based notes that stay connected
AI sidebar and browser agent for reading, writing and research
| Dimension / Metric | | |
|---|---|---|
| Official Domain | capacities.io | sider.ai |
| Pricing Model | Freemium, Paid | Freemium |
| Monthly Visits | 339.4K (339,396) | 2.64M (2,644,740) |
| MoM Traffic Delta | +18.16K (+5.7%) | -314.2K (-10.6%) |
| Primary Market & Share | 🇺🇸 United States (29.5%) | 🇺🇸 United States (13.3%) |
| Direct Visits / mo | 249.6K | 1.7M |
| User Rating | 4.5 | 4.5 |
| Supported Platforms | Website | Website |
A studio for your mind: object-based notes that stay connected
Model people, books, projects and meetings as typed objects with their own properties, instead of forcing them into folders.
See every link to a note at a glance, and let Capacities surface unlinked mentions where you already wrote about the same thing.
Capture thoughts without deciding where they belong first, then link and refine them later.
On paid plans, an AI assistant works alongside your notes, and image, PDF and weblink analysis turns outside material into usable content.
AI sidebar and browser agent for reading, writing and research
A persistent panel that reads the page you are on and answers follow-ups with GPT, Claude or Gemini without copying content into another tab.
Summarise long articles, PDFs and YouTube videos, extract key points, and ask detailed questions about the source material.
Translate webpages, PDFs and images, compare bilingual output side by side, and have content read aloud for review on the move.
Delegate multi-step tasks across real websites — price comparison, form filling, research and inbox triage — using your existing logged-in sessions.
SpecialistOpenAI's flagship multimodal assistant powered by GPT-6 and GPT-5.6 for reasoning, coding, and deep research.
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.
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.
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.
Provides robust browser-based summarization and prompt assistance, but lacks some of Sider's deeply integrated multi-model chat UI features.
Delivers a cleaner document editing experience with beautiful typography, but lacks network graph views and typed object modeling.
Delivers a cleaner document editing experience with beautiful typography, but lacks network graph views and typed object modeling.
Excels at advanced web automation and data extraction alongside chat, but has a steeper learning curve than Sider.
SpecialistOffline visual note-taking on an infinite canvas
SpecialistOffline visual note-taking on an infinite canvas
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
Free / Open-sourceSummarize YouTube, Google, and any page with AI — free in your browser
SpecialistADHD-friendly AI assistant for notes, email and tasks
SpecialistADHD-friendly AI assistant for notes, email and tasks
Offers superior visual whiteboarding and spatial structuring for complex research, but lacks Capacities' typed object database system.
Offers superior visual whiteboarding and spatial structuring for complex research, but lacks Capacities' typed object database system.
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
Integrates bookmark management and content composition into a clean sidebar, but has a more limited feature set than Sider.
SpecialistYour files, notes and meetings in one drive — with an AI that knows all of it.
SpecialistYour files, notes and meetings in one drive — with an AI that knows all of it.
