Pocket Professor
Now open in your browser

Your professor, in your pocket.

Study apps for college chemistry, biology and physics that show every step, not just the answer. Use them on your phone, or right here in your browser.

Explore the apps Try Chemistry free
Made by Cassiusa chemistry professor, and family
Biology Learn: Tardi the tardigrade introduces the first lesson
Biology
The Chemistry calculator: tap elements on the periodic table to build a formula
Chemistry
The Projectile lab: aim, launch and compare paths
Physics
  • 270short lessons across three sciences
  • 26+simulation labs to play with
  • 14,659compounds you can search offline
  • Phone + webthe same apps, no install needed

The apps

Pick a subject and start in seconds.

Each app opens right in your browser at its own address. No download, no sign-up, and the study apps keep working offline.

Study apps

Chemistry

General chemistry, CHEM 101–102

A periodic table that works as a calculator, with every step shown.

  • 53 short lessons across a two-semester course
  • Balancing, stoichiometry, Lewis structures and 3D shapes
  • Search 14,659 compounds, even offline
Open in your browser Learn more

Biology

College biology, BIOL 101–102

Live diagrams, lab simulations and lessons that explain every answer.

  • 100 lessons in three courses: cell, plant and animal
  • 37 interactive diagrams and 17 lab simulations
  • Punnett squares, chi-square and DNA to protein
Open in your browser Learn more

Physics

College physics, PHYS 101–102 and 201–202

A calculator that understands units, and a full college course to go with it.

  • 117 lessons, algebra-based and calculus-based
  • Units that multiply, cancel and convert for you
  • 9 simulation labs with live graphs
Open in your browser Learn more

Everyday apps

Pocket Parker

Everyday app · separate from the study apps

Can I park here? Every curb on the map is colored by whether you can park right now: green to park, yellow when time is limited, red for not now. Tap a curb to see how long you can stay and which rule comes next.

  • Street sweeping, time limits, meters and permit zones
  • Find parking near where you are going, best spots first
  • Ticket warnings and reminders on your phone
Open the map Learn more

Why Pocket Professor

Built to teach, not just to answer.

Every app is made by a chemistry professor and a biology graduate, around the way the course is actually taught.

Every step shown

See the work behind each answer, or switch on tutor mode to try it yourself first.

Right in your browser

Open any app at its own address on a laptop or a library computer. Nothing to install.

In your pocket

The same apps on your phone for studying between classes, even without a connection.

Private by design

No account needed to start, and your work stays on your device.

For instructors

Give your whole class the same problem set.

In Chemistry and Physics, build a problem set and share it as a link or a QR code. Every student gets the same problems, and a score they can send back to you.

Try it in Chemistry Talk to us
  1. Open Practice and choose the problems you want.
  2. Share the set as a link or a QR code on your slides.
  3. Students work through it and send you their score.
Cassius, the chemistry professor who makes Pocket Professor

Who makes it

Made by a chemistry professor and family.

I'm Cassius, a professor of chemistry. My wife and I both studied science, and Pocket Professor is how we share what we love: clear teaching, honest answers, and learning that anyone can reach.

Meet our family

On the way

A&P

Anatomy & Physiology

The next study app, for A&P and pre-health courses.

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A cooking app

The next everyday app, for the kitchen.