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. Ask and entity extraction are metered features on paid plans (see pricing) — local capture and unlimited local storage are free regardless of plan.