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STITCH CHECK

Serger vs sewing machine: which do you need first?

They don't compete. One builds the garment; the other finishes its seams. Here's how to tell which one you're missing.

Stitch Check editorsUpdated Sep 2026

What each machine does

A sewing machine makes a lockstitch with one top thread and a bobbin. It sews seams, zippers, buttonholes and topstitching: everything that holds a garment together.

A serger stitches the seam, trims the allowance and wraps the raw edge in one pass. It's faster on knits and gives the clean inside finish you see on shop-bought clothes, but it can't put in a zipper or a buttonhole.

Definition
Serger (overlocker)
A machine that sews, trims and overcasts a seam edge in one pass, using three to five threads, loopers instead of a bobbin, and a built-in knife.

Side by side

JobSewing machineSerger
ThreadsTop thread + bobbin3–5 cones, loopers
Trims fabricNoYes, built-in knife
Stretch seamsWith a stretch stitchNatively
Zippers, buttonholesYesNo
TopstitchingYesNo

Which to buy first

If you don't own a capable sewing machine, buy that first. A serger can't finish a garment on its own. If you already sew regularly and most of your projects are knits, a serger is the upgrade you'll feel most.

Short answer
No machine yet: sewing machine. Sewing knits every week: add a serger. Hemming activewear: you want a coverstitch, not a serger.

When you need both

Most people who make clothing end up with both: the sewing machine for construction and details, the serger for seams and finishing. Quilters and bag makers rarely need a serger at all.

Coverstitch vs serger · What is a serger?

Machines we'd start with

All serger picks

Questions people ask

Can a serger replace a sewing machine?
No. A serger cannot sew a zipper, a buttonhole, topstitching or a plain straight seam inside a garment. It finishes and seams edges. You need a sewing machine for construction.
Can a sewing machine do what a serger does?
Partly. An overcast or zigzag stitch finishes an edge, and a stretch stitch handles knits. It will not trim as it sews and the finish is not as clean, but it is enough for most woven projects.
Is a serger the same as an overlocker?
Yes. Serger is the North American name, overlocker the British one. Same machine.