SnapTrellis

SnapTrellis is a macOS application for collecting related screenshots into groups and exporting a group as one numbered, labeled image. Captures can be labeled as they are taken, and groups can be copied, saved, or shared as a combined image. The merged output includes the group title, screenshot numbers and labels, plus notes associated with markers.

Its editor provides text, arrows, shapes, highlights, crops, blur, solid redaction, background removal, and lettered markers with explanatory notes. It can also collect screenshots created with the standard macOS screenshot shortcut from a chosen folder, while retaining the original files in their existing location.

Capturing, labeling, markup, and copying individual screenshots remain available without payment. Merging groups is available for a 14-day trial and then requires a one-time in-app unlock; the app does not use an account or subscription.