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Kemia
A JavaScript editor and chemistry toolkit for embedding 2D molecular structures and reactions in web pages.
Open source. 22 of 65 checklist features confirmed.
Main canvas
No dark mode
Paclitaxel rendering is clipped to a thin strip.
Default drawings
SMILES produced clipped labels without visible bonds; no MOL import available.
Caffeine
SMILES produced clipped labels without visible bonds; no MOL import available.
Paclitaxel
No 3D view
Cholesterol in 3D
- Hosted reaction editor loaded with a preset reaction.
- Drawings were clipped to a thin strip in WebKit and Chromium.
- The separate SMILES demo accepted caffeine and paclitaxel.
- The editor File menu offered only New.
- The name resolver produced no result for aspirin.
Facts
- GitHub stars
- 14 stars on 6 Nov 2026
- First commit
- 18 Mar 2010
- Repository activity
- 721 commits, 10 contributors, last push 13 Jun 2011
- Latest version
- v0.2
- Version we tested
- v0.2-79-gceacc9a
- Runs on
- Browser
- License
- Apache License 2.0.
- Price
- Free
- Relies on
- None linked. Ported into its own code: CDK, MX. Own canvas; CDK coordinate generation and MX ring perception are ported.
- Draws with
- Google Closure goog.graphics with SVG, VML, or HTML canvas backends
- Chemistry from
- Kemia's own JavaScript chemistry toolkit
- Interface
- Google Closure Library (goog.ui)
- Main language
- JavaScript
- Other languages
- None
- Renderer
- Original: Kemia MoleculeRenderer over Closure graphics
- Third-party licenses
- Google Closure Library: Apache-2.0; MX-derived ring code: MIT upstream. CDK-derived layout files carry Apache-2.0 notices.
- Pre-alpha software; repository last updated in June 2011.
- SMILES generation is a stub; MOL export omits charges and isotopes.
- Several capabilities require API integration; the default toolbar omits cleanup.
Features
- Tested by running it
- Seen in the app
- The manual says yes
- Partly, with the reason shown
- Not supported
- Not established, which is not the same as no
Select a mark for its proof. A filled mark opens our screenshot, or the manual if the check left nothing to picture. A ring opens the manual.
Drawing structures
- Partly: Single, double, triple update atom labels; drawings are clipped. Opens the cited page.Single, double and triple bondsSingle, double, triple update atom labels; drawings are clipped.github.com
- Partly: Up, down, and wavy tools respond; drawings are clipped. Opens the cited page.Wedge, hash and wavy bondsUp, down, and wavy tools respond; drawings are clipped.github.com
- Partly: Quadruple bonds available; no dative option in bond menu. Opens the cited page.Dative, hydrogen and quadruple bondsQuadruple bonds available; no dative option in bond menu.github.com
- Partly: Automatic ring-interior or centered placement; no manual side selection. Opens the cited page.Choose double-bond sideAutomatic ring-interior or centered placement; no manual side selection.github.com
- Partly: Benzene tool responds; drawing is clipped. Opens the cited page.Ring toolsBenzene tool responds; drawing is clipped.github.com
- Not establishedChair and Haworth rings
- Partly: Number keys grow chains; no drag-chain tool. Opens the cited page.Chain toolNumber keys grow chains; no drag-chain tool.github.com
- Yes, according to the manual: Includes naphthalene beyond simple ring templates. Opens the cited page.Template libraryIncludes naphthalene beyond simple ring templates.github.com
- Not establishedSave your own templates
- Not establishedGroup abbreviations
- Partly: Element and charge editing; isotope labels are not rendered. Opens the cited page.Charges, isotopes and atom labelsElement and charge editing; isotope labels are not rendered.github.com
- Not establishedRadicals and lone pairs
- Yes, according to the manual: Hover an atom, then change its element or charge with shortcuts. Opens the cited page.Keyboard drawingHover an atom, then change its element or charge with shortcuts.github.com
- Partly: Molecule movement and rotation; rectangle selector remains a stub. Opens the cited page.Lasso select and transformsMolecule movement and rotation; rectangle selector remains a stub.github.com
- Not establishedTilt drawings in perspective
Reactions and mechanisms
- Partly: Forward arrow tool responds; drawing is clipped. Opens the cited page.Reaction arrowsForward arrow tool responds; drawing is clipped.github.com
- No: No curved arrow control in editor. Opens the cited page.Curved mechanism arrowsNo curved arrow control in editor.
- Yes, according to the manual: Reactants and products serialize as molecular graphs in reaction JSON. Opens the cited page.Machine-readable reactionsReactants and products serialize as molecular graphs in reaction JSON.github.com
- Not establishedAtom mapping
- Not establishedOrbitals and symbols
Figures and layout
- Not establishedRich text captions
- Not establishedShapes, brackets and curves
- Not establishedAlign and distribute
- Not establishedGroup and ungroup
- Yes, according to the manual: Optional coordinate-regeneration command; omitted from default toolbar. Opens the cited page.2D structure cleanupOptional coordinate-regeneration command; omitted from default toolbar.github.com
- Not establishedJournal drawing styles
- Not establishedReusable custom styles
- Partly: Element-wide palette configuration; no individual atom color control. Opens the cited page.Color controlElement-wide palette configuration; no individual atom color control.github.com
- Yes, according to the manual: Renderer API draws customizable colored halos around atoms and bonds. Opens the cited page.Color highlightingRenderer API draws customizable colored halos around atoms and bonds.github.com
- Not establishedPage layout and multipage
- Not establishedImported pictures
- Not establishedTLC plates and tables
Chemistry intelligence
- Not establishedStructure checking
- Not establishedR/S and E/Z labels
- No: No formula or mass command in demo. Opens the cited page.Formula and massNo formula or mass command in demo.
- Not establishedProperty estimates
- No: Aspirin resolver returned no structure. Opens the cited page.Name to structureAspirin resolver returned no structure.github.com
- No: No naming command in demo. Opens the cited page.Structure to nameNo naming command in demo.
- Not establishedNMR prediction
- Partly: R1 placement adds accessible label; drawing clipped. Opens the cited page.R-groups and query structuresR1 placement adds accessible label; drawing clipped.github.com
- Not establishedPolymers and repeat units
- Not establishedPeptides and nucleic acids
- Not establishedImage to structure
- Not established: NIH resolver wrapper uses a legacy external proxy; availability unverified.Online structure lookupNIH resolver wrapper uses a legacy external proxy; availability unverified.github.com
- No: No 3D view control in demos. Opens the cited page.3D model viewNo 3D view control in demos.
- Not establishedCrystal structures
Files and exchange
- No: File menu contains only New. Opens the cited page.CDXML import and exportFile menu contains only New.
- Not establishedCDX import and export
- Yes, according to the manual: MOL read/write API; SDF records split manually. Opens the cited page.MOL and SDFMOL read/write API; SDF records split manually.github.com
- Partly: Separate demo accepts SMILES; no output command; drawing clipped. Opens the cited page.SMILESSeparate demo accepts SMILES; no output command; drawing clipped.github.com
- Not established: Resolver demo accepts InChI; remote backend availability unverified.InChIResolver demo accepts InChI; remote backend availability unverified.github.com
- Yes, according to the manual: RXN reading and writing through JavaScript API. Opens the cited page.RXN filesRXN reading and writing through JavaScript API.github.com
- No: No image export command in demo. Opens the cited page.SVG exportNo image export command in demo.
- No: No PDF export command in demo. Opens the cited page.PDF exportNo PDF export command in demo.
- No: No PNG export command in demo. Opens the cited page.High-resolution PNGNo PNG export command in demo.
- Not establishedPaste to and from ChemDraw
- Not establishedEditable in Word or PowerPoint
- Not establishedWindows Office OLE
APIs and automation
- Not establishedPython API
- Yes, according to the manual: Documents parsing, coordinate generation, and editor initialization. Opens the cited page.JavaScript or TypeScript APIDocuments parsing, coordinate generation, and editor initialization.github.com
- Not establishedCommand-line tool
- Not establishedAI agent control
- Not establishedBuilt-in AI assistant
Embedding and extension
- Yes, according to the manual: Documented plugin base class with event and command extension hooks. Opens the cited page.PluginsDocumented plugin base class with event and command extension hooks.github.com
- Yes, according to the manual: Load kemia.js; instantiate kemia.controller.ReactionEditor and register editing plugins. Opens the cited page.Embed in your own appLoad kemia.js; instantiate kemia.controller.ReactionEditor and register editing plugins.github.com