If you are specifically looking for an IPA-based jailbreak because you do not have access to a computer, Checkra1n is not the tool for you. Depending on your iOS version and device, you may want to look into:
Please proceed with caution and at your own risk. Checkra1n Ipa
Since you cannot use an IPA, follow these steps using a computer: Get the official application for macOS or Linux Prepare Device: If you are specifically looking for an IPA-based
Checkra1n is a semi-tethered jailbreak tool for iOS devices. It uses a bootrom exploit to gain access to the device's filesystem. This guide will walk you through the process of installing Checkra1n IPA on your iOS device. Checkra1n Ipa