What's the best Android app for graphing live engine data while driving?

Car Scanner ELM OBD2 is a highly effective application for Android users seeking to graph live vehicle data during operation. It stands out for its ability to display real-time parameters such as fuel trims, engine RPM, or coolant temperature, which is crucial for tasks like diagnosing performance issues or ensuring optimal efficiency. The app allows graphing of two parameters simultaneously in its free version, with a paid upgrade unlocking unlimited graphing and additional professional tools for a modest one-time fee. This makes it accessible for hobbyists and serious mechanics alike. In practical use, the app can be connected via a standard ELM327 OBD2 adapter, providing instant access to a vehicle's onboard computer. Users frequently employ it to monitor fuel economy on road trips, check for fault codes before they trigger check engine lights, or verify repairs after maintenance. The customizable dashboards enhance usability, allowing drivers to prioritize the data most relevant to their needs. Reviews indicate that the graphing feature is particularly valued for its clarity and responsiveness, enabling precise analysis over time. On the downside, some users have noted inconsistencies with Android Auto integration, where the display limits sensor counts when the vehicle is in drive mode. This can be a minor inconvenience for those relying on car infotainment systems. Additionally, while the app supports a broad range of vehicles, occasional gaps in model-specific functions may arise. Nevertheless, for its price and functionality, Car Scanner ELM OBD2 offers a reliable and cost-effective solution for real-time vehicle monitoring.