Mailtrack is the right tool when you want the absolute cheapest paid tracker on Gmail and you treat opens as nice-to-know. It stops being right the moment the "Sent with Mailtrack" footer becomes a credibility problem, you add an Outlook user who needs more than opens, or you start routing follow-ups off open data and discover that raw pixel-load counts are padded with machine opens.
These are the six Mailtrack alternatives worth evaluating, ordered by the trade-offs Mailtrack-leaving teams most often cite: removing the footer, gaining full tracking in Outlook, getting opens graded as a person or a machine, and adding AI features without jumping to enterprise pricing.