Ninjagram is a classic Instagram bot. It means that, just like any other bot, it performs actions instead of you in this particular case, follows, likes, and comments on your behalf. They've been around since 2018, but, unfortunately, the quality of their services deteriorated.
Are there any Instagram bots that work?
The Main Instagram Bots Instagram Bot Follower Still the best Instagram bot we've found by far - #1. Growth Beast - An new affordable Chrome Extension automation platform - #2. InflactSolid automation experience - #3. Instazood - Great customer service - #4.