A mechanism animator for organic chemistry

Draw the curly arrows and Athanor works out the next step of the reaction and plays it: bonds break and form, and the electrons visibly flow along each arrow, lone pairs along curly arrows and single electrons along fishhooks. It is free, in the browser and on Windows.

How it works

  1. Draw the starting materials, or type them into Quick insert with /.
  2. Add the curly arrows with the Arrow tool (W).
  3. Athanor checks the arrows, works out the next structure and animates the step.
  4. Open the Timeline to set the pace, add highlights, and keep an energy diagram in step with the playhead.

What you can make

  • Ready-made mechanisms to start from: SN1, SN2, E1, E2 and more.
  • An energy profile beside the reaction, its marker following the animation.
  • Exports to MP4, GIF, a slide deck with a slide per step, animated SVG, Lottie, or a link to embed.
  • Problem sets that grade a student’s arrows, one arrow at a time.