The past decade has seen a proliferation of fluorescent voltage indicators. Given the multiple choices, each with different tradeoffs between response speed and sensitivity, brightness and spectral range, one might ask: which sensor is better? In a recent review published by our group and Prof. Adam Cohen at Harvard University, we outlined the history of these voltage indicators, highlighting those with promising characteristics for in vivo imaging. We also discussed protein engineering strategies that gave rise to these sensors, and hoped that this article will inspire novel ideas for better probes. Read about it in Current Opinion in Chemical Biology