The publisher will celebrate a year since the launch of Dark Horse Digital with a 10% reduction on all titles in its web store.
The sale will run from Friday, April 27 until Sunday, April 29.
An additional coupon will be offered to all its newsletter subscribers who have signed up by April 26.
Dark Horse launched its dedicated digital app and the digital store on April 27, 2011.
The publisher instituted simultaneous release dates for digital and print from December 14, 2011.
On April 22, Dark Horse made a one-shot prologue of Brian Wood's The Massive free to download in celebration of Earth Day.
> Dark Horse chief explains Digital delay