What Is a Personal Knowledge Base Browser Extension?
A personal knowledge base browser extension saves web pages, notes, files, and AI chats directly from your browser, then automatically organizes everything into a connected wiki — searchable, explorable as a graph, and queryable in plain language — instead of leaving you to sort saved content into folders by hand.
How it works
- You save something — a web selection, a clipped page, a file, or an AI conversation — with one click.
- An extraction step reads the content and identifies the entities and topics it touches on (a project name, a person, a concept, a tool).
- Those entities are matched against your existing knowledge base — new topics become new wiki pages, and anything that overlaps an existing topic gets merged into it.
- The result is a set of wiki pages, each aggregating everything you've ever saved about that topic, connected to related pages.
When to use one
A personal knowledge base extension is worth using when you regularly research topics across many sources — articles, AI chats, your own notes — and want to come back to a coherent picture of a topic later, rather than a pile of disconnected saves.
It's less useful for one-off information you'll never need again — a quick bookmark manager is enough for that.
How SiderMem does this
SiderMem is a Chrome extension that implements this pattern. Every memory you save — from a web page, a manual note, a file, or an AI chat on ChatGPT, Claude, Gemini, or DeepSeek — runs through automatic entity extraction and gets merged into your personal wiki. You can browse the result as an interactive graph (Graph View), search it instantly, or ask it a question and get an answer grounded in your own saved content.
Local storage is unlimited and free on every plan; cloud sync is opt-in, so you control what leaves your device.
Limitations
Entity extraction is automated, so occasionally a topic may be split or merged differently than you'd expect by hand. Entity extraction itself is included with cloud sync capacity on every plan, including Free, and is never metered separately — only Ask has its own monthly quota that scales with your plan (see pricing). Local capture and unlimited local storage are free regardless of plan.