How to Use BibCrit

BibCrit is a Claude-powered biblical textual criticism toolkit. Each tool streams AI analysis directly in your browser, letting you explore divergences between the Masoretic Text (MT) and the Septuagint (LXX), profile scribal tendencies, model numerical discrepancies, reconstruct plausible Hebrew Vorlagen, compare Dead Sea Scrolls witnesses, trace patristic citations, detect theological revisions, and visualize manuscript genealogies — all without installing any software.

8 analysis tools

10 LXX books profiled

3 manuscript traditions

Analysis Tools

find_in_pageMT/LXX Divergence Analyzer

Enter a verse or chapter reference and BibCrit lists every word-level divergence between the Hebrew MT and the Greek LXX, classifying each as a translation technique, inner-Greek variant, or evidence for a divergent Vorlage. Results stream in real time via Server-Sent Events.

Try Psalm 22:1 →

translateBack-Translation Workbench

For any LXX passage, Claude reconstructs the most probable Hebrew text that would have generated the Greek, annotating each back-translated word with its confidence level and the translation strategy it implies. Ideal for identifying passages where the LXX preserves a textual variant invisible in the MT.

Try Exodus 3:14 →

radarScribal Tendency Profiler

Select an LXX book and get a five-axis radar chart of the translator's characteristic tendencies: literalness, anthropomorphism reduction, messianic heightening, harmonization with other biblical books, and overall paraphrase rate. Each dimension is scored and supported by real textual examples.

Try Isaiah →

calculateNumerical Discrepancy Modeler

Genealogical ages, census figures, and chronological numbers routinely differ between MT, LXX, and SP. Enter a reference (e.g. Genesis 5) and Claude models which tradition preserves the earlier tradition, what scribal mechanism likely caused the shift, and how each manuscript family resolves the arithmetic.

Try Genesis 5 →

history_eduDSS Bridge Tool

Compare a biblical passage across Dead Sea Scrolls manuscripts, the Masoretic Text, and the Septuagint. See which scrolls attest the passage, how closely each scroll aligns with the MT or LXX, and the specific divergences between witnesses — bringing the earliest surviving Hebrew manuscripts into your analysis.

Try Isaiah 7:14 →

psychologyTheological Revision Detector

Identify where translators or scribes may have altered the text for theological reasons — anthropomorphism avoidance, messianic heightening, polemical changes, or harmonization with theological conventions. Each flagged passage is assessed for its likely motivation and tradent context.

Try Genesis 1:1 →

churchPatristic Citation Tracker

Trace how Church Fathers through the 5th century cited a biblical passage, what text form they used (MT-like, LXX-like, or divergent), and what their citations reveal about early textual transmission. Patristic evidence often preserves readings lost from surviving manuscript branches.

Try Isaiah 53:1 →

account_treeManuscript Genealogy

Visualize the full transmission stemma of a biblical book — from proto-text through manuscript families (MT, LXX, DSS, SP, Peshitta, Targum, Vulgate) to modern critical editions. Understand the genealogical relationships between traditions and where each branch diverges from the others.

Try Isaiah →

Manuscript Traditions

BibCrit works across three major textual witnesses to the Hebrew Bible, each with its own transmission history and scholarly edition.

Tradition	Full name	Language	Approximate date	Standard edition
MT	Masoretic Text	Biblical Hebrew / Aramaic	Consonantal text c. 1st c. BCE; Tiberian vocalization c. 7th–10th c. CE	Biblia Hebraica Stuttgartensia / BHQ
LXX	Septuagint	Koine Greek	3rd–1st c. BCE (Pentateuch earliest)	Göttingen Septuagint (critical); Rahlfs-Hanhart (hand edition)
SP	Samaritan Pentateuch	Samaritan Hebrew	Script diverges c. 6th–4th c. BCE; extant MSS medieval	von Gall 1918; HBCE (in progress)

How Analysis Works

Each BibCrit tool draws on Claude's extensive training in biblical studies, ancient languages, and the primary literature of textual criticism. When you submit a passage or book, Claude consults that training knowledge to apply the same analytical frameworks used in critical scholarship — Tov's divergence taxonomy for the Divergence Analyzer, Aejmelaeus's translation-technique categories for the Scribal Profiler, the standard Vorlage reconstruction methodology for the Back-Translation Workbench, and so on. See Scholarship & Methodology for the specific sources that inform each tool.

Where the analysis touches manuscript data that can be verified — such as the presence of a Dead Sea Scrolls witness, the alignment of a patristic citation, or the numerical value in a specific tradition — Claude cross-checks its response against its knowledge of the standard critical editions. Results stream to your browser in real time so you can follow the analysis as it develops. Frequently analyzed passages load from a shared cache, so you see prior results immediately.

All analysis is produced from Claude's training knowledge. BibCrit does not query external databases at runtime. Results should be cross-checked against primary sources — BHS/BHQ, the Göttingen LXX, the DSS transcriptions — before citation in peer-reviewed work.

Understanding Confidence Scores

Each divergence, back-translation item, or numerical interpretation carries a confidence badge reflecting how well-attested the scholarly judgment is:

HIGH

The conclusion is strongly supported by textual evidence and documented in major critical commentaries or critical editions. Multiple independent witnesses or well-established translation pattern.

MEDIUM

The interpretation is plausible and consistent with known scribal patterns, but alternative explanations exist. Treat as a working hypothesis for further investigation.

LOW

The evidence is ambiguous or the judgment involves significant inference. Useful as a starting point but should be checked against primary sources before citation.

Scholarship & Methodology

BibCrit's prompts are informed by the standard reference works and methodological frameworks of LXX and textual criticism scholarship. Key sources include:

Emanuel Tov — Textual Criticism of the Hebrew Bible (3rd ed., Fortress, 2012): the standard taxonomy of divergence types, Vorlage reconstruction methodology, and scribal error classification.
Anneli Aejmelaeus — On the Trail of the Septuagint Translators (Peeters, 2007): translation technique analysis, literalness scoring, and paratactic vs. hypotactic syntax tendencies.
Jan de Waard & Eugene Nida — A Translator's Handbook on the Bible: functional equivalence principles used to classify paraphrase and dynamic rendering.
Biblia Hebraica Stuttgartensia (BHS) and Biblia Hebraica Quinta (BHQ): the critical apparatus entries that classify variants as Vorlage differences, inner-Greek corruption, or translation choices.
Göttingen Septuagint: critical edition used for LXX textual variants and Greek manuscript attestation.
Dead Sea Scrolls (4QSam^a, 1QIsa^a, and others): pre-MT Hebrew witnesses that occasionally support LXX pluses and minuses against the MT.

All analysis is produced by Claude from its training knowledge. BibCrit does not call external databases at runtime. Results should be cross-checked against primary sources for peer-reviewed publication.

Frequently Asked Questions

Is BibCrit peer-reviewed?

No. BibCrit is a research aid powered by a large language model. Its analyses reflect Claude's training on published scholarship but have not been independently verified by human specialists. Always cross-reference significant findings with primary critical editions (BHS/BHQ, Göttingen LXX) and relevant commentaries before citing in academic work.
What is a Vorlage?

A Vorlage (German for "exemplar" or "master copy") is the Hebrew source text that a translator used when producing a Greek (or other language) version. When the LXX reading differs from the MT, scholars ask whether the translator had a different Hebrew manuscript in front of them — a divergent Vorlage — or whether the difference arose within the Greek transmission. The Back-Translation Workbench and Divergence Analyzer both attempt to distinguish between these two scenarios.
Why do numbers differ between MT and LXX?

Numerical discrepancies — such as the patriarchal ages in Genesis 5 or the census figures in Numbers — arise from several converging causes: Hebrew letters serving double duty as numerals (making them vulnerable to paleographic confusion), deliberate chronological adjustments to align with different calendrical or theological schemas, and transmission errors in both MT and LXX branches. The Samaritan Pentateuch provides a third independent witness that sometimes supports the LXX against the MT. BibCrit's Numerical Discrepancy Modeler analyzes each case individually.
Does BibCrit support the Dead Sea Scrolls or the Peshitta?

The DSS Bridge Tool (/dss) is now live and lets you compare any passage across Dead Sea Scrolls witnesses, the MT, and the LXX simultaneously. Peshitta integration is a planned future addition. Samaritan Pentateuch data is already included in the Numerical Discrepancy Modeler, and the Manuscript Genealogy tool covers the Peshitta, Targum, and Vulgate as transmission branches.

travel_exploreExplore the Discovery Feed

Browse plain-language summaries of the most interesting MT/LXX divergences, scribal patterns, and numerical traditions already analyzed — no passage reference needed.

Open Discovery →

Open Data API

All cached analyses are freely accessible via a public REST API under the Apache 2.0 license — query, download, and reuse them in your own research or tools.

Example queries:

            # All cached analyses (paginated)

            GET /api/cache

            # Filter by tool

            GET /api/cache?tool=divergence

            # Filter by tool + passage

            GET /api/cache?tool=theological&ref=Isaiah+7:14

            # Only discovery-ready results

            GET /api/cache?discovery_ready=true&limit=50&offset=0

Each record includes the full structured JSON as generated by Claude, plus metadata: tool, reference, model_version, cached_at. Supported query parameters: tool, ref (substring match), discovery_ready, limit (max 200), offset.

Full API specification, schema documentation, and usage examples are in the GitHub repository under docs/api-reference.md.

If you use BibCrit data in research, please cite:
Fresco Benaim, J. (2026). BibCrit: AI-assisted biblical textual criticism. ORCID:0009-0000-2026-0836

BibCrit was created by Jossi Fresco 0009-0000-2026-0836