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Last updated: 28/08/2026

Welcome⚓︎

Welcome to NACSOS! 🎉 'NLP Assisted Classification, Synthesis and Online Screening' is an online tool for screening and annotating literature for systematic reviews.

Many researchers are familiar with Google Scholar or other academic searches to find literature. However, for a systematic literature review, this is only the starting point as you should consider the complete literature on a topic of interest. Given a rigorously evaluated complete query on one or several databases, you will now need to go through these results and identify what actually fits the scope of your research projects. You also need to merge multiple sources (queries from various search databases) and deduplicate.

This is where the platform comes in. NACSOS helps you to collect literature from various sources, deduplicate the identified literature and sort (we say "annotate") the literature into user-defined categories using an intuitive interface.

The platform was presented at the WWCS Workshop in Potsdam in Oct 2023. This slide deck gives a quick tour of the platform.

Citation

If you are using this platform in your work, please consider citing us. The most recent publication (pre-print) is available on arXiv.

@article{repke2024nacsos,
  title={NACSOS-nexus: NLP Assisted Classification, Synthesis and Online Screening with New and EXtended Usage Scenarios},
  author={Repke, Tim and Callaghan, Max},
  journal={arXiv preprint arXiv:2405.04621},
  year={2024},
  eprint={2405.04621},
  archivePrefix={arXiv},
  primaryClass={cs.DL},
  url={https://arxiv.org/abs/2405.04621}
}

Statistics⚓︎

The platform currently hosts ~100 projects, ~300 users, ~775k annotations, and 11.4M documents (~8M academic abstracts, ~2.2M LexisNexis articles, ~800k Tweets).
Last updated: 20.08.2026

Getting started⚓︎

  • You can access the platform here.
  • A glossary containing terminology used on the platform and in this guide can be found here.
  • If you are here simply for annotating what was assigned to you, here is the Annotator Guide.
  • If you want to set up and manage a project in NACSOS, here is the full User Guide.
  • For guidelines on how to conduct systematic reviews/mapping, see Best Practises.
  • If you are interested in the backend of NACSOS, check out the Developer Guide. Here, we keep the design decisions and development details for future reference.

Issues⚓︎

We share the platform free of charge. Check out our Terms of Service.

Login doesn't work and you don't receive a reset link? This might help you.

If you have any other issues, read Known Issues first. If the issue cannot be resolved, follow the guidelines for reporting bugs here. We will do our best to get back to you.

🚧 This is work in progress! 🏗
This documentation is not complete. We are doing our best to keep extending and improving it, but what you are looking for might not yet exist or the documentation may not reflect what the platform is actually doing. We'll do our best to keep things in sync and up to date. We greatly appreciate any help in making this page as helpful for everyone as possible. It's really easy to edit, just let us know that you'd like to support us.