Best simple vertical scratcherTrees & scratchersAmazon Basics
Amazon Basics Sisal Cat Scratching Post
Tall sisal post with a stable base — teach the sofa a boundary

Best tall, stable sisal post
SmartCat
Budget tier: $$
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A 32-inch sisal post on a 16-inch square base, tall enough for a full stretch
SmartCat's Ultimate Scratching Post (made by Pioneer Pet) is a tall, plain sisal post often recommended for cats that scratch the couch. The listing gives 16 x 16 x 32 inches and about 13.5 lb. Height and weight are what count, because cats tend to give up on short posts that wobble. Assembly takes two screws and two dowels.
Who it's for: Indoor cats scratching couch arms or door frames, and bigger cats who topple short posts.
Skip if: Your cat only scratches rugs and floors. Start with a cardboard pad instead.
Alternatives with different tradeoffs — not clones of the same pitch.
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SmartCat Ultimate Scratching Post (32 inch)