# Chemguy — Chemistry App for Students > Comprehensive chemistry course with videos, notes, practice, and direct instructor messaging. (iPhone/iPad app by Rob Lederer.) - Source: https://appshunter.io/ios/app/chemguy/id1473143126 (this page in markdown: same URL + `.md`) - Developer: [Rob Lederer](https://appshunter.io/developer/1472015812) - Category: Education - Price: Free with in-app purchases - Rating: 5.00/5 from 4 App Store ratings · 9 written reviews indexed - Age rating: 4+ - Requires: iOS 15.6 · 72 MB - Languages: American English - Released: 2019-07-30 - Data updated: 2026-06-05 - Monetization: free - User reviews in markdown: https://appshunter.io/ios/app/chemguy/id1473143126/reviews.md ## What is Chemguy? The Chemguy App has arrived! I'm Rob Lederer and I taught chemistry for 35 years. I've taught all high school levels of chemistry, including AP Chemistry and IB Chemistry, too! Since 2003, I have been known as Chemguy to the students outside of my classroom. My Chemguy YouTube videos have millions of views. The Chemguy App that I have personally built has distilled my teaching career into a course that completely covers high school chemistry, AP and IB material, and first year university chemistry. Everything is covered: The Periodic Table, Compounds and Reactions, Stoichiometry, Solutions, Gases, Atomic Theory, Chemical Bonding, Molecular Shapes, Energy, Electrochemistry, Chemical Equilibrium, Acids and Bases, Organic Chemistry, Chemical Kinetics, Thermodynamics, and Calculating Uncertainty Values. Phew! This is what you get in the Chemguy App: 1. Over 200 video lessons, where I teach all the chemistry principles, give detailed explanations, and problem-solve through all the calculations in every unit of study. 2. My entire classroom note package. All the material explained, with tables and diagrams and pictures. At the end of each lesson there are practice problems, over 1000 in all, to hone your chemistry skills. 3. Tests! I have made close to 100 interactive quizzes for all the lessons and summary unit exams, too! That's a total of over 1000 questions to practice! 4. Chemguy Messaging. After going through all of the above, is there still something that you need help with? Send me a text in the chat function of the app! Let's talk about it! So, watch the videos, read the notes, do the practice problems, have fun with the quizzes, and cap each unit off with the exam. And if something is bugging you, chemistry-wise, send me a message and let's chat about it! If you want to know more about me, what I've done and what I continue to do, please visit my website, roblederer.ca ## Key features - Over 200 video lessons - Comprehensive classroom notes - 1000+ practice problems - 100+ interactive quizzes - Unit exams - Direct messaging support ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | Complete Chemguy Course Entry | Free | one-time | ## Recent user reviews (9 of 9) All indexed reviews: https://appshunter.io/ios/app/chemguy/id1473143126/reviews.md ### 5/5 — Amazing app! *2023-11-16, version 1.1* Genuinely helped me understand chemistry so much, notes and videos are detailed and are explained in a way that is easy for me to understand. Not only that, but all lessons are free. The best learning app there is!! ### 5/5 — Wow what a great teacher! *2023-02-07, version 1.1* Some people just make it easier…all the materials are so well put together. Am going to share it with everyone in my Chem1110 class! ### 5/5 — Loving it!!! ❤️ *2020-10-26* I’ve never taken a chemistry class in high school. Now I’m taking my first college chemistry class. Once I got to a lesson on moles, I knew I had to have extra learning to help. This app helps me so, so much! I love it! I also watch Rob Lederer’s YouTube videos (which I’m thankful are also provided in the app— so perfect!). They’re really attention-grabbing. He’s so happy and makes chemistry both fun and exciting. 😊 I definitely recommend using this app and watching his videos if anyone else needs help with chemistry. He makes it so much more interesting and easier to understand. God bless and have fun doing chemistry! :) ### 5/5 — Exceptional Resource! *2019-08-01, version 1.0* Having everything you need to do well in chemistry, all in one place, and always with you on the go, makes doing well in the class infinitely easier. Buying the full version might just be the best two dollars you’ll ever spend! ### 5/5 — ChemGuy is the best teacher ever! *2019-07-30, version 1.0* With his help I was able to not only learn a lot, but pass my chemistry courses with flying colours. Not only in high school, but in my undergraduate studies as well. I’d recommend his courses to anyone taking chemistry in first year university/ college (to build a fantastic foundation) or high school. ### 5/5 — Excellent resource for chemistry students *2019-07-30, version 1.0* Great organization of topics in the notes packages. Chemguy videos included. Quizzes, practice tests. This is a great app. Well done, Chemguy! ### 5/5 — Excellent! *2019-07-26, version 1.0* From beginning to end, this is what students will need. It takes them through everything they will need to be successful. I will be recommending it to my students! ### 5/5 — Awesome! *2019-07-25* This is a great app for my middle & high schooler!!! So much information!! Love the quizzes too. Great Job!!!! ### 5/5 — Awesome App *2019-07-25, version 1.0* This is perfect for students who want to prepare for their future in Chemistry. Excellent for exam prep! ## Frequently asked questions about Chemguy ### What chemistry levels does Chemguy cover? Chemguy covers all high school levels of chemistry, including AP Chemistry and IB Chemistry, as well as first-year university chemistry material. The app is designed to be comprehensive for these academic stages. ### How many video lessons are included in Chemguy? Chemguy features over 200 video lessons. These videos provide detailed explanations and problem-solving for all chemistry principles and calculations within each unit of study. ### What kind of practice materials are available in Chemguy? The app offers over 1000 practice problems to hone chemistry skills, along with nearly 100 interactive quizzes and summary unit exams. This provides ample opportunity for users to test their understanding. ### Can I get help if I'm stuck on a chemistry concept in Chemguy? Yes, Chemguy includes a messaging feature where you can send a text to the instructor for help. This allows for direct communication to discuss any chemistry-related questions or difficulties. ### What is the age rating for Chemguy? Chemguy has an age rating of 4+. This indicates it is suitable for a wide range of users, including younger students and those just beginning their chemistry education. ### On which devices can I use Chemguy? Chemguy is available on iPhone, iPad, and iPod devices. This broad compatibility ensures access for many Apple users. ### How often is Chemguy updated? The latest version of Chemguy is 1.2, and it was last updated on March 27, 2026. This indicates a recent update, suggesting ongoing development and support for the application. ### Does Chemguy have ads? No, Chemguy does not contain advertisements. As a free application with in-app purchases, it provides an ad-free learning experience for its users. ## Version history (last 3 releases) ### 1.2 — 2026-03-27 This chemistry app is free! No in-app purchases and no ads! Just chemistry help for high school and post-secondary chemistry students! ### 1.1 — 2020-04-10 Updated Chemistry Notes ### 1.0 — 2019-07-24 No release notes. ## Related topics [good chemistry](https://appshunter.io/ios/topics/good-chemistry) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-05.*