Visualisation tools used for the visual inspections. Left panel: Mosaic tool showing an 8 × 8 grid whilst highlighting sources classified as ‘lenses’ with a capitalised ‘L’ instead of the UNIONS stamp. Right panel: One-by-one sequential tool showing a spiral galaxy on the left side and the larger field of view from Legacy Survey on the right side. The source is classified as a ‘non-lens’ and further sub-classified as a ‘spiral’. Both applications are using logarithmic scale and a grey colour-map for the UNIONS stamps.