The best replacement for coverstitch is serger.

The best alternatives to coverstitch are rated as following:
★★★★★  serger
★★★  overlock
★  flatlock
★  twin needle

Your alternative for coverstitch is not listed? Suggest!
Speaking about coverstitch, one probably shouldn't forget about serger.

Other search terms related to coverstitch and their ratings are:
★★★★★ serger
★★★ brother 1034d
★ regular serger
★ singer serger
You have in mind a companion for coverstitch and it is not yet here? Propose!



Google Trends

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coverstitch
serger
overlock