Ace your next chemistry test with Lewis Dot. The most powerful app available to understand Lewis dot structures! It is the ultimate reference tool for chemistry and premed students learning about Lewis dots. Chemist approved.
Ranked top 10 app for Education in multiple countries, and featured on Apple’s Amazing Apps and Games List.
*** Featured in The Huffington Post and BostInno ***

+++ “It was really helpful for my gen chem class” -Alia of the Knife

+++ “Perfect for chemistry class.” -Bethhawking2012

A painless way to get help with chemistry.

Lewis Dot has 100 molecules and their Lewis dot structures available for reference in the app. Easily compare Lewis dot structures for homework or practice with ours. All of our molecules are fact-checked by our local chemist, and include explanations for why the Lewis dot structures are the way they are.

Each Lewis dot has:
• Picture of the Lewis dot
• Explanation of the Lewis dot
• Explicit vs Implicit Images (where applicable)
• Resonance Images (where applicable)
• Charges (where applicable)
• Structure
• State at STP
• Molar mass
• Density
• Melting Point
• Boiling Point
• Number of Bonds
• Number of Lone Pairs
• Founder
• Fun Fact
• BONUS: Many of the molecules now come with a fire diamond!

There is also a comprehensive, interactive, and colorful periodic table, which gives information on all of the elements, including Bohr model!

• Students and teachers can now submit their own Lewis dots to us! Pending review, we will include the Lewis dot and give credit to you in the app!
• There are now definitions to explain to students what the fire diamond, molar mass, lone pairs, valence electrons, etc are.
• There are lewis dot and periodic table rules to explain to students exactly how to make a lewis dot.

Download Lewis Dot now and make studying chemistry pain-free!

Terrapin Computing is a Boston-based company devoted to making learning easier for students and teachers. We address the issues that students face on a regular basis, and aim to make education more manageable and interactive. Follow us on Twitter, Instagram, or Facebook today @terrapinco.

• Terrapin Computing is proudly run by women in tech.

Reviews like yours help our apps to keep getting better. Please consider leaving us an app review today. Better yet, have suggestions? Send us an email at

What’s New

Version 3.0.4

This app has been updated by Apple to use the latest Apple signing certificate.

Speed updates and bug fixes! Lewis Dot now loads faster so you can get right to studying.

Reviews like yours help our apps to keep getting better. Please consider leaving us an app review today. Better yet, have suggestions? Send us an email at

Ratings and Reviews

2.3 out of 5
6 Ratings

6 Ratings

imperial LC ,

Needs better explanation of what it does

This was a waste of my money. I thought I would be able to see a 3D model. At least.

But this doesn’t provide anything I can’t just google.

MiCkY :) ,


Helpful and easy to use! Would recommend

Sc1gu1 ,

Not worth it

Bought this to use with my students. It is very limited and lacking.

App Privacy

The developer, ALLIE LLC, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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