Do I need the app to see the results or are they readable on the test card? Sarah Russell July 26, 2021 20:19 Updated Yes, you'll need the Vessel app to read the test card markers and see your results. The app is completely free—you only pay for the test cards.Download the app now on the App Store or Play Store today! Related articles How do I contact support? Is the app free to use? Why test with urine rather than blood? If I'm pregnant, can I still use Vessel? What's different? How do I reset my Vessel app password?