𐤊𐤕𐤁
Initializing Engine
𐤀
Drop Text File
0 lines · No text loaded Select text → bubble · Drag file anywhere · ↑ hover for controls · learn.katab.org ·
0
SELECT TEXT TO DEFINE
No translations yet.
Select a word and click Tr.
No highlights yet.
Select text and click ◈.
⊕ OPEN TEXT
Adding your own texts: Place .ktb or .txt files in texts/ next to index.html, then add an entry to the LIBRARY array in app.js. See the Upload tab to load any file directly without editing the library.
0 chars
⬆ Click to choose a file, or drag it here
File format
.txt / .ktbPlain text, UTF-8. Original Latin encoding.
Single ↵Verse separator (thin rule)
Double ↵↵Chapter separator (medium rule)
Triple ↵↵↵Book separator (heavy rule + glyph)
To add a file permanently to the Library, place it in texts/ and register it in the LIBRARY array in app.js.
◈ ANNOTATE SELECTION
⌨ TRANSLATE WORD
⇪ SHARE INSIGHT
? KEYBOARD SHORTCUTS
EscClose modal / sidecar / bubble ?This shortcuts reference Ctrl ZUndo last edit Ctrl YRedo edit Ctrl ⇧ ZRedo edit (Mac) EnterCommit inline edit / save modal Select → DefineOpen lexicon for selected word Select → TrAdd / edit translation gloss Select → ◈Annotate line with colour + note Select → EditInline-edit line text ⊞ GlossToggle translation gloss view ⇪ ShareGenerate shareable link or card ↓ ExportDownload current text as .txt ⇅ SyncSync scroll between split panes Drag fileLoad any .txt or .ktb file
About

KatabAPP is a free, offline-first workspace for studying Biblical Hebrew, Aramaic, and related Semitic scripts. It renders text in 22 historical scripts simultaneously, provides BDB and Strong's lexicon lookup, character-level gematria, scholarly annotation in the .ktb format, and privacy-preserving share links — with no account, no telemetry, and no server-side state.

Corpus Sources
Open Scriptures Hebrew Bible (OSHB) v2.0
Morphologically tagged Westminster Leningrad Codex with Strong's numbers. Maintained by the Open Scriptures project.
github.com/openscriptures/morphhb
License: CC BY 4.0 — attribution required.
Unaccented Westminster Leningrad Codex (UXLC)
Clean unaccented text of the Leningrad Codex (L) as transcribed by the Westminster Hebrew Institute.
tanach.us
License: Public domain — no restrictions.
BDB / Strong's Lexicon
Brown–Driver–Briggs Hebrew and English Lexicon entries and Strong's concordance numbers, as compiled and digitised by various open-source projects. Public domain.
Technology
LZ-String
Lossless string compression by Pieroxy, used for share URL encoding.
github.com/pieroxy/lz-string · MIT License
Script fonts
Noto font family (Google / Noto authors), IBM Plex Mono (IBM), Amiri (Khaled Hosny). All served via Google Fonts under SIL OFL.
AI-assisted development
Engine architecture, annotation system, and scholarly tooling developed with the assistance of Claude (Anthropic).
License — MIT-0

Copyright © 2025–2026 KatabAPP contributors.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY ARISING FROM THE USE OF THE SOFTWARE.

MIT-0 (No Attribution) — the most permissive open-source license. You are not required to credit KatabAPP when reusing this code, though attribution to the corpus sources above (OSHB CC BY 4.0) is independently required by their own licenses.

KatabAPP v2.0 · katab.org · learn.katab.org