No registration email required. Just download and install.
"But that's a LUFS meter, not an RMS meter." True – but LUFS is essentially . The free version includes a "RMS" readout mode. Switch it from LUFS to RMS in the settings for that classic, unweighted average level. free rms meter plugin
https://youlean.co/free-loudness-meter/
Part of the massive "MFreeFXBundle," this plugin is perhaps the most feature-rich free meter on the market. Advanced users who want deep technical data. No registration email required
If you want just a needle and a number – no graphs, no LUFS – grab by TBProAudio (free). free rms meter plugin