Chem Pal

Search and compare laboratory chemical product listings across supported supplier websites.

Chem Pal — Compare chemical reagent prices across suppliers, right from your side panel. Chem Pal is a free, open-source shopping assistant for chemistry hobbyists, students, and DIY makers who buy laboratory reagents. Instead of opening a dozen supplier websites, copying prices into a spreadsheet, and squinting at wildly different units and currencies, you type one search and get a single, sortable comparison table — without ever leaving the page you're on. There are plenty of price-comparison tools for businesses, universities, and research labs. Chem Pal is built for the individual: it focuses on suppliers that sell to private buyers and ship to residential addresses, so the results you see are things you can actually order. WHAT IT DOES • Search many chemical suppliers at once. One query fans out across a growing list of more than two dozen reagent suppliers and returns everything in one place. • Compare fairly, not just quickly. Prices are converted to a common currency and quantities are normalized to a common unit, so you can see the true price-per-amount even when one supplier lists "500 g" and another lists "1 lb" in a different currency. • See the chemistry, not just the listing. Results are automatically enriched with details like CAS number, molecular formula, molecular weight, purity/grade, and concentration, so you know you're comparing the same substance. • Jump straight to the documents that matter. When a supplier provides them, Chem Pal surfaces one-click links to safety and product documents (SDS, TDS, COA). • Track prices over time. Save products and watch price history across suppliers and individual variants, so you can buy when the price is right. • Sort and filter everything. The comparison table is fully sortable and filterable, with an advanced search syntax for narrowing results down to exactly what you want. WHY YOU'LL WANT IT • Save money. Seeing every supplier side by side — in the same currency and the same units — routinely surfaces the cheapest real option, not just the first one you happened to click. • Save time. No more juggling tabs, conversion calculators, and unit math. The work of gathering and normalizing listings is done for you. • Buy with confidence. Auto-detected chemical identity and quick access to safety documents help you confirm you're ordering the right material at the right grade. • Stay out of your way. Chem Pal lives in the browser side panel (and can also open in a popup or its own tab), so you can compare while you browse instead of switching contexts. HOW IT WORKS 1. Open the Chem Pal side panel. 2. Type a chemical name, CAS number, or formula — or highlight text on any page and use the right-click "search selection in Chem Pal" menu. 3. Review the combined results table, sort or filter, compare price-per-amount, and follow the links to buy. PRIVATE AND TRANSPARENT BY DESIGN • No account or sign-up required. • No data collection by the developer. Chem Pal has no backend server of its own and includes no analytics, tracking, or advertising. Your searches and saved items stay on your device; the only thing that leaves your browser is the search you send to the suppliers you choose — exactly as if you visited those sites yourself. • Free and open source. Available for both Chrome and Firefox, with light and dark themes. See the full privacy policy for details on exactly what stays local and what is sent to suppliers. Start comparing in seconds — install Chem Pal, open the side panel, and run your first search.