Yes, a clip-on macro lens can help create more background blur in very close-up shots, but mostly because macro shooting naturally gives very shallow depth of field. The main purpose of a macro lens is to focus much closer on small subjects, not specifically to blur backgrounds.

With a phone macro attachment, you’ll usually need to get extremely close to the subject. That can make the background fall out of focus, but it also limits what you can photograph well. It’s more suitable for small, still objects than for things like insects.

The tradeoff is image quality and usability: inexpensive phone macro attachments are often more of a fun accessory than a high-quality lens. They may be hard to use and may reduce sharpness or overall image quality.

So: if your goal is casual close-ups of small objects with some background blur, a phone macro attachment may help. If you want high-quality macro results, don’t expect too much from a cheap add-on lens.