can I use a rachet to tighten these?

If you mean a socket wrench, I guess if you have a square socket you could, but I just used a crescent wrench

can this or something similar be used with 8mm polyrope?

Should work fine if you attach firmly to spool. Spool is designed for wire/cable. If you cannot make rope attachment to spool work start off with short bit wire on spool make loop in wire & attach rope to wire & its ready to tighten .

Are these compatible with the tightener tool from tractor supply or should I purchase a different one to fit these?

From what I've seen they are all the same design, try the one from Tractor supply it should work just fine. I use a 12 inch adjustable wrench to tighten mine.

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Description

⚡ Tighten your fence, tighten your control!

QUICK INSERT DESIGN - Insulated loop on top allows fast, hassle-free wire insertion—save time on setup.
RISK FREE INVESTMENT - 100% satisfaction guaranteed with hassle-free replacement for any defects.
UNMATCHED DURABILITY - Crafted from premium steel for long-lasting strength and reliability.
UNIVERSAL COMPATIBILITY - Works seamlessly with steel, aluminum, poly wire, poly tape (up to 1.5"), and poly ropes.
EFFORTLESS TENSION CONTROL - Precision ratchet mechanism ensures perfect wire tension every time.

This 10-piece set of heavy-duty steel electric fence wire strainers features a precision ratchet tensioner compatible with steel, aluminum, poly wire, poly tape (up to 1.5" wide), and poly ropes. Designed for quick wire insertion with an insulated loop, it’s perfect for temporary electric fences and managed grazing. Backed by a 100% satisfaction guarantee, it ensures reliable, efficient fencing solutions for modern farm management.