Code Reviews for Jupyter Notebooks

Say Goodbye to messy JSON diffs!
Install GitHub App

Install via GitHub

Install ReviewNB on any of your GitHub Repositories

Browse Commit/PR

See Notebook Diff for any Commit or Pull Request


Cell Level Comments to Collaborate within your Team

Conversation Threads

Track All Open Issues with Conversation Threads

You’re in good company

Billy Lamberta

Tensorflow docs & tech writer at Google

As a popular open source project, receives many pull requests for our notebook documentation. I care about content—not the file format—and ReviewNB provides a quick way to view notebook diffs so reviewers can focus on the changes that matter.

Sylvain Gugger

Research scientist at

Our MOOC and the full documentation of our open-source library is build from notebooks and we have a lot of contributors who help perfect them. ReviewNB has been a lifesaver to help us quickly see diffs and post comments whenever we ask for something to tweak in a specific cell.


Can we self host ReviewNB?

  • Yes. If you're interested in on-prem installation, please fill this form and we'll get in touch.

Does ReviewNB work with GitHub Enterprise?

  • Yes. Our self hosted installation works with GitHub Enterprise & both.

Does ReviewNB work with GitLab or BitBucket?

  • Not yet. Additional platform support is one of our most requested feature. Feel free to upvote/follow updates.

Which repositories can ReviewNB access?

  • We can only access repositories for which you have enabled ReviewNB on GitHub
  • You can enable/disable individual repository access at any time from GitHub

What GitHub permissions do you need?

  • Read repository contents to fetch notebooks and compute diff
  • Read repository metadata to fetch list of commits and PRs
  • Read-Write access to pull requests to read & write PR comments

How can we trust ReviewNB with our private repositories?

  • ReviewNB does NOT store any repository contents. Notebooks / Diffs / Comments / Commits / PRs, none of these are stored in ReviewNB
  • Anytime you open a diff, we make API calls to GitHub to fetch the data. We process the diff and serve it to your browser in real time
  • Any comments you write are also directly posted to GitHub & not stored in ReviewNB

Still, how can we trust ReviewNB?

What about GitHub access token security?

  • GitHub access tokens are stored with AES (Advanced Encryption Standard) encryption
  • Every time you logout and login, we generate a new GitHub access token. That way, your tokens are automatically rotated and the old one becomes defunct

When will you be out of beta?

  • May 2019

How will the pricing look like after beta period?

  • We'll always be free for open source repositories. We'll charge a small amount for private repositories
  • You can find the exact pricing on our GitHub marketplace listing (this will come into effect once we are out of beta in May 2019)


We are currently in beta and not charging any users.
We'll always be free for open source repos (even after beta).
We'll charge small amount per private repo to cover hosting costs & pay the creator.



I'm Amit Rathi, developer & entrepreneur behind ReviewNB. More about me.


Jupyter is loved universally but version control & reproducibility is a challenge, specially in a team setting. Talking to data scientists convinced me that it's a widespread problem & one worth solving. Besides, diff algorithms are fun to write :)


Our aim is to make notebooks a first class entity in Data science & ML teams. Next up, we're developing continuous integration (CI) platform for ReviewNB notebooks. It's built around treon, our open source library for notebook testing.

We're building in the open. You can view upcoming features, vote on them,  and even request a new one.

Get in touch!