No. It only reads and modifies mesh data, so it works the same regardless of whether you're using EEVEE, Cycles or any other render engine.

Yes. Every tool runs correctly from Edit Mode: it briefly switches to Object Mode to apply the change safely, then restores your original mode and active object automatically. You won't notice a mode switch happening.

Only if you're using the "Whole Object" scope. With "Each Mesh Island" scope, the tools only affect the islands that contain at least one selected vertex — unselected islands are left untouched. This works for Align Selected, Add Exact Distance, Move Exact Distance, Set Exact Dimensions, Extrude and Distribute Evenly. Match Active Object is the one exception, since it compares whole objects rather than islands.

A disconnected piece of geometry inside a single mesh object — for example, five separate window frames joined into one object but not connected to each other. The addon can detect and treat each one independently, without you needing to separate them into different objects first.

Add Exact Distance changes size: it grows or shrinks the object in a chosen direction. Move Exact Distance changes position only: the object's size stays exactly the same, it just relocates by the amount you enter.

Yes. Alignment and movement are computed in world space using each object's own local orientation, so rotation is respected. For scaled objects, turn on "Apply Object Scale First" so that the real-world distances you enter stay accurate rather than being distorted by the object's scale.

Centimeters, millimeters or meters, chosen from the Input Unit dropdown. Values are converted using your scene's own unit scale, so results stay accurate regardless of your project's unit settings.

The active object always stays fixed; the other selected object moves to create the exact gap you entered. This works whichever of the two objects is positioned first along the chosen axis.

Yes, you choose the mode: an exact gap between each pair of neighbors, or an exact center-to-center pitch. The first item along the axis stays fixed and every other item is repositioned relative to it.

No. The tools operate on mesh data specifically. Convert other object types to mesh first (Object > Convert To > Mesh) if you need to use the addon on them.

When enabled, the input fields for that tool clear themselves back to zero right after you apply, so you can immediately type the next distance without manually clearing the previous one first.

Yes. It reflects the currently active object's Depth X / Width Y / Height Z at all times, in your chosen unit, with no button to press. It's read-only.

Yes, it's pure Python running on Blender's own API, with no platform-specific code and no external dependencies.