How to Build a Personal Knowledge Wiki (2026 Guide)
How to build a personal knowledge wiki — practical setups using Obsidian, Notion, and other tools to create a searchable, linked knowledge base that grows more useful over time.
How-To Guides
How to save product pages for comparison shopping — the best methods to track prices, compare specs, and organize product research so you can make better purchasing decisions without losing track of what you found.
Comparison shopping requires keeping track of multiple product pages across different sites, with prices, specs, reviews, and availability that can change while you're still deciding. Most people handle this with a dozen browser tabs — tabs that get closed accidentally, tabs whose prices have changed since you opened them, and tabs without any notes on what you actually thought of each option.
This guide covers how to save product pages for comparison shopping in a way that preserves the information, survives tab closure, and lets you make a decision without starting over.
Prices change. The product you screenshot at $189 is now $209. The sale you saw is gone. Without capturing the price at a specific moment, you can't compare accurately.
Tabs close. One accidental swipe on mobile or a browser crash on desktop, and the seven product tabs you had open are gone.
Specs are scattered. Product A's specs are on a different page from Product B's specs, formatted differently, using different terminology. Comparing them requires switching between tabs and memorizing.
Reviews are lengthy. Amazon review sections are scrollable through hundreds of entries. The opinions that mattered — the consistent complaints about battery life, the note about the unusual size — are buried.
Decision criteria shift. You started researching laptops thinking price was the priority, then realized battery life is actually more important. The notes you took with price as the axis are now less useful.
The simplest method — and the one most people already use, imperfectly.
Setup:
To compare across tabs:
Limitation: Prices and availability at save time aren't captured. If you close the tabs and return tomorrow, you're back to the live page, which may have changed. No notes attached to bookmarks.
For major purchases (laptops, appliances, cars, software), a comparison spreadsheet is the most organized approach.
Google Sheets / Excel template:
Create a sheet with:
Fill in one row per product. The columns make comparison immediate — you can sort, filter, and see differences at a glance.
For price tracking: Add a "Price on [date]" column. Revisit weekly and add a new date column if prices changed.
Advantage: Completely organized, sortable, filterable, and shareable (for household purchases decided jointly). Free. Limitation: Manual entry for each product. Time investment upfront.
Several tools automatically track price changes on product pages.
Honey is a free browser extension primarily known for coupon codes, but it also tracks prices on Amazon and other major retailers.
How to use Honey for price tracking:
Advantage: Automatic price drop notifications. Works on Amazon and select major retailers. Limitation: Doesn't save the product page for comparison — it only tracks price. Not universal across all sites.
camelcamelcamel.com tracks Amazon product price history over time.
How to use CamelCamelCamel:
Advantage: Free, accurate historical price data for Amazon products. Helps identify whether a "sale" price is actually a discount.
For purchases where you want the full product page captured with its specs, price, and description — preserved at a moment in time — a web capture tool saves the complete product page for later comparison.
How to save product pages with WebSnips:
Benefits for comparison shopping:
After saving: Compare by searching the collection. "Which products mentioned 8 hours battery life?" → search "8 hours" in the collection → results show every product page where that phrase appeared.
For systematic comparison research, a Notion database works like the spreadsheet method but with richer formatting:
Database structure:
View as a gallery to see product thumbnails alongside key specs. Switch to table view to sort by price or rating.
Scenario: You're comparing 5 standing desks in the $400-800 range. You need to compare height range, weight capacity, motor quality, and warranty.
Setup: Create a Google Sheet with columns: Name, URL, Price, Min Height, Max Height, Weight Capacity, Motor (single/dual), Warranty, Review Avg, Pros, Cons, Total Score.
Day 1 — Research and capture:
Day 2 — Compare:
Decision: Eliminate the two most expensive options that don't offer proportional spec improvements. Choose from the remaining three based on weighted criteria.
Don't compare from memory. Trying to remember whether Product A or Product B had the 7-year warranty while shopping leads to errors. Write it down.
Don't compare without capturing the price at a specific date. A spreadsheet with current prices that you'll review in two weeks is unreliable — prices change. Capture price at research time, not at decision time.
Don't trust "was $X now $Y" sale indicators. CamelCamelCamel or price history tools verify whether the "original price" is genuine. Many retailers set artificial high prices to make sale discounts look larger.
Don't keep more than 5-7 products in active comparison. More than 7 products in a comparison creates decision paralysis. After initial research, eliminate products that clearly don't meet criteria before detailed comparison.
What's the best free tool for tracking Amazon prices? CamelCamelCamel (price history) and Honey (price alerts) are both free and reliable. CamelCamelCamel is better for research; Honey is better for passive monitoring.
How do I compare products across different sites (not just Amazon)? A manual comparison spreadsheet handles any site. Google Shopping (shopping.google.com) aggregates prices for identical products across multiple retailers in one view.
Can I save product pages that require login (like members-only pricing)? WebSnips and most web capture tools save what's visible in your browser — including logged-in views. If you're logged in and can see the price, a web capture saves it.
Saving product pages for comparison shopping requires capturing the right information (price, specs, reviews) at a specific moment and organizing it for comparison rather than browsing. The combination of a spreadsheet (for structured spec comparison), CamelCamelCamel (for price verification), and a web capture tool (for preserved full-page reference) gives you a reliable research foundation for any purchase decision.
More WebSnips articles that pair well with this topic.
How to build a personal knowledge wiki — practical setups using Obsidian, Notion, and other tools to create a searchable, linked knowledge base that grows more useful over time.
How to build a second brain in 30 minutes — a practical quick-start for knowledge workers who want a working personal knowledge management system without spending days on setup.
How to capture ideas before you forget them — the fastest tools and habits for getting ideas out of your head and into a retrievable system the moment they occur to you.