If your budget does not allow for a premium commercial license, you do not need to risk downloading pirated files. Google Fonts offers several beautiful, open-source Thai sans-serif fonts that mimic the clean, loopless, and modern aesthetic of Kittithada Light 45:

Are you on the hunt for that perfect, clean Thai-Latin hybrid typeface? 🧐 The keyword has been trending in the design community lately, and for good reason.

A complete set of Thai glyphs, Latin characters, and punctuation.

If you can tell me (website, print, app), I can give you more specific advice on how to pair it with other fonts. If you'd like, I can: