Observed arrival · 2026-09-22
Ejja Chem, chemistry without the fume hood
A free browser-based editor for drawing molecules and reactions, checking structures, and exporting them in chemistry-friendly formats.
- For
- Chemistry students, researchers, and scientific writers
- Worth noticing
- The homepage lists eight chemistry file formats, 100-plus molecular models and fragments, and local handling of drawings.
Field notes
The homepage frames the editor as a bridge between hand-drawn chemical structures, laboratory files, databases, and publication graphics. It describes formula and molecular-mass checks, stereocentre and charge inspection, reaction mechanisms, and a Clean Up command for geometry. Example output includes aspirin and caffeine-style molecular data, while the format list spans structure files, reaction files, identifiers, and image exports. The page also says drawings stay local, apart from names sent to PubChem for lookup.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue