Masson identified Front as the closest competitor to Missive. He noted that the two companies have had direct discussions, that Front's team tried Missive and Missive's team tried Front, and that there was, according to Masson, mutual inspiration between the products. He described the relationship as a good one. Hiver was also mentioned as a comparable tool.
Missive publishes long-form comparison pages targeting searches such as Missive versus Spark and Missive versus Slack. Masson said these pages are written honestly, including acknowledgment of Missive's shortcomings relative to competitors, and that this approach appears to perform well in organic search. No financial or operational figures about any competitor were confirmed by those companies; all characterizations are Masson's own.