I checked it out for a bit...
I'm a little confused on how they got their data, though they do attribute a book by Asperilla which is good.
But it seems like they're missing some really basic and super common verbs...so it seems like overall an unreliable resource for verb conjugations.
For example, you mentioned somewhere else that it only shows "tulungan" for the root "tulong"...which is weird...since "tumulong" is just as common in frequency in our 24 million word corpus.
Another example..."maging" is one of the most common verbs in Tagalog...and it's not in that dictionary...
Anyway...my recommendation is to avoid the site, since it seems unreliable, unfortunately...
I'd recommend this site (TLDC) as an alternative.
This site is built around the idea of prioritizing verb usage and resources based on frequency from our 24 million word corpus. Using the "verb family" section of a verb page will show you related verbs.
PRO TIP...if you search for "root verbs" on this site it will show you only verb results for that "root"...
For example, searching for "tulong verbs" will show you all the verbs with "tulong" as their root...and the green boxes will show their relative frequency from out sample texts...
by: 
