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The flaring M4 dwarf GJ 1243 has become a benchmark for studying stellarflare and starspot activity thanks to the exceptional photometric monitoringarchive from the Kepler mission. New light curves from the TESS mission forthis star allow precise stellar activity characterization over more than adecade timescale. We have carried out the first flare and starspot analysis ofGJ 1243 from over 50 days of data from TESS Sectors 14 and 15. Using 133 flareevents detected in the 2-minute cadence TESS data, we compare the cumulativeflare frequency distributions, and find the flare activity for GJ 1243 isunchanged between the Kepler and TESS epochs. Two distinct starspot groups arefound in the TESS data, with the primary spot having the same rotational periodand phase as seen in Kepler. The phase of the secondary spot feature isconsistent with the predicted location of the secondary starspot andmeasurement of weak differential rotation, suggesting this secondary spot maybe long-lived and stable in both latitude and longitude. As expected for thishighly active star, the constant spot and flare activity reveal no sign ofsolar-like activity cycles over 10 years. However, we highlight the uniqueability for Kepler and TESS to use flare rates to detect activity cycles.

10 Years of Stellar Activity for GJ 1243