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OtterSR

Screen, extract, and write an entire systematic review in an afternoon

AI-assisted systematic reviews, from references to a written report, with evidence you can click.

Join the betaSee how it works

$50 on your first review when you save a card. No subscription. No seat fees.

Screening, then extraction, on one citation — with the sentence every answer came from.

How it works

Four steps from a reference file to a written review.

  1. The import screen: a reference file has been uploaded, its columns mapped to title, abstract, authors and year, with duplicates already flagged before anything is saved.

    Step 1 of 4

    Import your references

    Search a database, and deduplication is automatic.

  2. The protocol editor: an eligibility question with its answer options, each tagged include, exclude or neutral.

    Step 2 of 4

    Define your protocol and parameters

    Control your screening and extraction AI.

  3. The screening workspace: the AI's answer with its confidence score beside the sentence it was drawn from, and the reviewer's own choice still unmade.

    Step 3 of 4

    Screen, validate, and extract together with AI

    Supercharge your confidence; see what the AI sees.

  4. The Write stage: the manuscript beside its preview, with an AI run drawing a figure.

    Step 4 of 4

    Write a review

    Ask for a table, a forest plot or a results paragraph. AI writes it from your data and cites every study.

Built for the parts that actually take time

Screening is not the slow part. Deciding whether to trust a screen is.

Evidence you can click

Every answer links to the sentence it came from. Try it: click one.

Check an answer in seconds, not by re-reading the paper.

Click an answerp. 1

Measles outbreak in an office building in the crowded Metropolis of Beijing, China

Li et al., BMC Infectious Diseases 2019;19:771

We performed descriptive analyses of data on demographic characteristic, laboratory testing and epidemiological information. From February 25 to March 28, 2016, 43 outbreak-related measles cases occurred in an office building in Beijing. The total crude attack rate was 1.20% in the building. The age range of patients was 23 to 45 years old, of whom 30 (69.8%) were migrants and 5 (11.6%) were vaccinated but without documentation.

From Li et al., BMC Infectious Diseases 2019;19:771, CC BY 4.0.

Create living systematic reviews

Figures, tables and text stay tied to your data. Add a study, and the report rewrites itself.

Figures and tables refresh free. AI rewrites each passage from its instructions.

  • Reviewer-in-the-loop, backed by research

    A second agent re-checks low-confidence calls. You confirm every decision.

    Hu et al., 2025 · Cochrane Evidence Synthesis and Methods →

  • Every step, one place

    Your last SR tool: search, dedupe, screen, extract, analyse and write — with your team. No exporting between tools.

  • Months of work, done in days

    The AI reads every abstract and paper first. You spend your time on the calls that need you.

The OtterSR screening engine

Custom agents, built for systematic review

OtterSR runs screening and extraction agents built for one job: each reads a citation against your eligibility criteria, commits to one of your answer options, scores its own confidence and quotes the sentence it relied on. A second agent re-reads anything shaky and says where it disagrees.

Four tiers, from a thousand abstracts for the price of a coffee to the hardest full texts. Set one for the whole review, or one per phase.

Full pricing

The cost calculator, the threshold ladder and every limit, spelled out.

Pay for what you use

No subscription. No seat fees. You are charged per token, and for nothing else.

Price per million tokens and per 100 papers, by engine tier.
TierPer 1M inPer 1M outPer 100 papers*
Otter-NanoBig libraries, first-pass triage$0.67$3.33$0.38
Otter-MiniEveryday title and abstract screening$2.00$10.00$1.13
Otter-ProFull text, extraction and writing$8.00$40.00$4.52
Otter-MaxThe hardest judgement calls$20.00$100.00$11.31

* Screening only: title and abstract, 4 questions per paper with the second reader on — the same arithmetic the app uses before a run. Full-text extraction sends the whole document and costs more per paper. Your figure moves with your protocol, and the app shows an estimate before every run and the real cost after it.

Join the beta

The beta is open. Create an account, try the sample review, then put your own review through it.

Join the beta

$50 on your first review. Save a card to claim it; nothing is charged until you load money. No subscription, no seat fees. Your exports are yours either way.

Questions?

Ask us anything about how OtterSR screens, what it costs, or whether it fits your review. A person answers, usually the same day.

Contact us

b25hu@uwaterloo.ca