BOOSTER SEO & IMAGE OPTIMIZER

The free app is okay and automatically labels your images which is pretty neat, happy to strongly recommend it.
I trialled the paid app and I assume it worked well.
It took my images from around 40% to around 90%.
I have no idea what the percentage is of but I assume it is relevant.
My issue is with the price, $20 per month! every month, for ever.
Shopify only costs me $80 per month.
Is this little app worth one quarter of what I pay Shopify? Short answer No.
I deleted the app and the owner then offered a 20% discount if I signed up.
Is the app worth $16 per month? Still no.