Abstrackr

Abstrackr is a web-based citation-screening tool for systematic reviews, best suited to researchers, librarians, and review teams managing study selection. Its no-cost, uncapped workflow is compelling for screening and reporting, but it is not a fit for teams that need paper summaries or full-text analysis.

Overview

Abstrackr supports solo screening as well as blinded team review, pilot rounds, and conflict resolution. After about 100 labels, its model ranks the remaining citations by predicted relevance. That can help teams prioritize a long queue, though it depends on reviewers first making an initial set of decisions and does not replace their judgments.

A live PRISMA flow table tracks screening thresholds, conflict-resolved counts, exclusion reasons by tag, and analysis of the machine-learning stop point. This connects screening activity to review reporting, a practical advantage for teams that want progress and decisions reflected in one workflow.

Key features

Users can import citations from PubMed, Scopus, and Embase, or upload RIS and CSV files. Abstrackr deduplicates by DOI and PMID and supports merging remaining near-duplicates; automatic matching helps consolidate a set, but it does not eliminate the need to handle similar records that remain.

Blinding is enabled by default. Changes to it are recorded in an audit log with the acting user, reason, timestamp, and project snapshots, giving teams a record of how blinding settings changed. Projects have Member and Leader roles, and team size is unlimited. Automated reminders go out 7, 4, and 1 day before an assignment deadline, which can help keep distributed screening work moving.

Exports include CSV and RIS, plus a full JSONL export that users can query with DuckDB. The range supports both familiar spreadsheet workflows and more structured downstream querying. No installation is needed. For methodology questions and workflow discussion, Abstrackr directs users to its community forum.

Pricing

Abstrackr has one plan: Free at free, billed completely free. There are no seat limits, usage caps, or subscription. That makes it an unusually straightforward option for large or collaborative reviews where per-seat costs or screening quotas would be a constraint. The trade-off is scope: it has no AI paper summaries or full-text analysis, so teams needing those capabilities must add another tool or choose a different workflow.

Platforms

Abstrackr runs on the web, with no installation needed. It suits teams working in a browser, but the platform offering is limited to web.

Who it's for

Abstrackr is a strong fit for researchers, librarians, and review teams that need structured citation screening, conflict handling, and PRISMA tracking without seat or usage fees. Its unlimited team size is especially useful when a review involves many screeners. It is less suitable for users whose workflow depends on paper summaries or full-text analysis.

Pros and cons

• Pros: Free with no seat or usage caps, so teams can scale participation without subscription costs.
• Pros: Screening modes, conflict resolution, and a live PRISMA table keep review decisions and reporting progress connected.
• Pros: Import and export options cover common citation formats, with JSONL available for DuckDB querying.
• Cons: Machine-learning ranking begins only after about 100 labels, so it does not prioritize the queue from the outset.
• Cons: No paper summaries or full-text analysis; teams needing either will have to look elsewhere.
• Cons: Web is the only platform, limiting the choice for teams seeking a desktop or self-hosted setup.

Alternatives

Choose ASReview if you want a free, open-source option spanning web, desktop, API, and self-hosted platforms; running your own hardware or server may incur costs. Rayyan is worth considering if you need Android or iOS access, though its free plan is capped at 3 active reviews and 2 free reviewers, with limited mobile access. RobotReviewer is another free, open-source option under GPL-3.0. Universal SLR Assistant is free and open source, though cloud AI provider API fees may apply.

Axelium may suit a solo researcher who wants core features in a browser extension or web app, but its free plan is limited to one lifetime review and one seat. Elicit is an alternative for users who want unlimited paper summaries and chat with papers, with limited usage for its Research Agent and Research Reports. LitFlow offers a free academic-use option and can be self-hosted. Mapped Research is a better match for teams seeking AI-assisted screening and open-access full-text retrieval, but its free plan caps screening at 1,000 citations, AI-assisted screenings at 200, and collaborators at 3.

For more options, browse AI Literature Review Software, Literature Review Software, or Systematic Review Software.

Verdict

Choose Abstrackr for a no-cost, unlimited-seat citation-screening workflow that combines team conflict handling with PRISMA tracking. It is a particularly practical choice for collaborative systematic reviews that need rigorous screening without per-user fees. Look elsewhere if paper summaries, full-text analysis, or a non-web platform are essential.