How do I know how much space I have free on my internal SSD - conflicting information

I upgraded the hard drive in my early 2011 macbook pro to a 512 GB SSD.
When I go into 'get info' in Finder it was  152 GB free (out of 512 GB)
However,  when I run two third party utilities it tells me instead that I have  100 GB free.
First    "Daisy Disk" - a great utility - scans the SSD  and comes back with  99.9 GB free.
Then 'Cocktail'  another top utility tells me I have used 80% of my SSD  - also implying  100 GB free.
Can anyone throw any light on this?
PS One more thing,  a few days ago  'get info' in Finder was showing  just 120 GB free, so I had a clear out of unwanted files and cleared out 30 GB of junk , hence the 152 GB free now (according to 'get info').    Even before the clear out, the 3rd party utilities were showing 100 GB free and that's what they're still showing now.  Any ideas welcome.
Regards
Danbo

Apps that scan all your folders and total up file sizes cannot give accurate pictures of total disk space used, because they cannot look inside certain folders that you don't have access to. Some of those folders will be system folders, others will be folders belonging to other user accounts. The "Get Info" numbers in the Finder are correct.

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