To protect your personal data, you should strictly stick to trusted open-source repositories on platforms like GitHub and verify the hashes of any IPA files you choose to install. If you want to transition to a more secure setup, tell me: What is your device currently running? Are you currently jailbroken , or using a stock iOS setup?
To use CrackTool4 effectively and safely, you must utilize its native format through an active jailbreak environment: cracktool4 ipa better