About CompoundLookup

The only chemistry database that lets you discover compounds by simply selecting elements.

Our Mission

CompoundLookup was created with a simple goal: make chemistry data accessible to everyone, regardless of their expertise level. We believe that exploring chemical compounds shouldn't require memorizing complex molecular formulas.

Traditional chemistry databases like PubChem and ChemSpider are incredibly powerful tools, but they're designed for experts who already know exactly what they're looking for. If you want to find a compound, you need to know its exact formula (like C₆H₁₂O₆), its CAS number, or its IUPAC name.

But what if you're a student wondering "what compounds can I make with carbon and oxygen?" Or a researcher exploring all possible combinations of certain elements? That's where CompoundLookup comes in.

What Makes Us Different

Element-Based Search

Instead of requiring exact formulas, we let you select elements from the periodic table. Click on Carbon and Hydrogen, and instantly see all C-H compounds in our database.

No Data Collection

We don't store any user data whatsoever. No accounts, no tracking, no cookies for personalization. Everything happens in your browser - your searches stay private.

Massive Database

Our database contains over 7.5 million compounds organized into 200,000+ unique element combinations. All data is sourced from PubChem and updated regularly.

Completely Free

CompoundLookup is free to use, forever. No subscriptions, no premium tiers, no paywalls. We believe educational tools should be accessible to everyone.

How It Works

We Index PubChem Data

We process millions of compounds from PubChem's database and organize them by their element composition. This creates a unique index that allows element-based searching.

You Select Elements

Using our interactive periodic table, you click on the elements you're interested in. Select anywhere from 1 to 5 elements to define your search.

Instant Results

We instantly show you all compounds that contain exactly those elements. Each result includes the molecular formula, IUPAC name, molecular weight, and a direct link to PubChem for more details.

Who Is This For?

✓
Students
Learning chemistry and exploring what compounds different elements can form.
✓
Educators
Teaching chemistry concepts and demonstrating element interactions.
✓
Researchers
Exploring compound possibilities before diving into detailed research.
✓
Curious Minds
Anyone interested in chemistry who wants to explore and learn.

Data Attribution

NIH

PubChem - National Library of Medicine

All compound data displayed on CompoundLookup is sourced from PubChem, the world's largest free chemistry database. PubChem is maintained by the National Center for Biotechnology Information (NCBI), a division of the National Library of Medicine (NLM) at the National Institutes of Health (NIH).

Visit PubChem

Ready to Start Exploring?

Select elements from the periodic table and discover compounds.

Go to Periodic Table