Yes, and it is worth knowing which free methods actually work for which question, because they solve different problems.
Retailer AR try-on is free and genuinely excellent for eyewear, since frames sit on a fixed point of your face. Size and fit finders on large retail sites are free and useful for predicting a size within brands they have data for. Marketplace try-on features built into shopping surfaces are free where supported, though coverage is uneven by category and region.
The most accurate free method for sizing is also the least glamorous: measure a garment you already own that fits the way you want, and compare it to the product's published flat measurements. It costs nothing but a tape measure and beats every size predictor, because it is anchored to a real garment on your real body.
What free tools generally do not give you is a visual of an item from any store on your own body, which is where paid photo-based try-on comes in. Most tools in that category, including this one, meter usage because each generation costs real compute.