There is no legitimate, official, or safe software that functions as a "free" decoder for ionCube 13. Searching for such tools often leads to security risks, including malware or fraudulent services. The Nature of ionCube 13 Protection
Keep in mind that:
The safest and most straightforward method to work with encoded files is to use official tools provided by IONCube. This might involve purchasing a license or using free tools that allow viewing but not modification. ioncube 13 decoder free
No reputable software security firm offers commercial IONCube 13 decoding because of legal and ethical boundaries. There is no legitimate, official, or safe software