DiffAb

Diffusion model for antigen-specific CDR design and optimisation.

Shitong Luo et al. (academic release)

What it does

Designs or redesigns CDRs against a given antigen. Input: an antibody-antigen complex structure (or a docked framework) and the CDR to vary; output: sampled CDR sequence-structure pairs, supporting de novo design, sequence-structure co-design and optimisation of an existing antibody.

Commercial use

Commercial use OK

Licence as writtenApache License 2.0

Apache-2.0 LICENSE in the repo; the trained checkpoints are distributed from the same repository with no separate terms. It does depend on antibody structure tooling, which you should licence-check separately.

Proof — pages read on 15 Oct 2026
  1. raw.githubusercontent.com/luost26/diffab/main/LICENSE

The licence read at the source allows use by a company. Attribution or copyleft conditions may still apply — read the note.

Is commercial use free of charge?

Free for commercial use

Free: Apache-2.0 code and checkpoints, no fee.

Proof — pages read on 15 Oct 2026
  1. raw.githubusercontent.com/luost26/diffab/main/LICENSE

Price and rights are separate: this panel is about money, the panel above is about permission.

When to use it

A well-known, easy-to-run baseline for CDR redesign when you already have a complex structure - good for optimisation and for sanity-checking newer tools. It needs a starting complex; it will not find an epitope for you.

Facts

Maker
Shitong Luo et al. (academic release)
Cost for commercial use
Free for commercial use
Compute
Single GPU
Open weights
Yes
Licence
Apache License 2.0
Official site / repo
github.com/luost26/diffab
Last verified