TheoMeter vs Holler

TheoMeter helps you monitor sound levels, view live frequency spectrum activity, and document setup conditions from your iPhone. Designed for public-event and auditorium sound checks, TheoMeter combines a live dB meter with spectrum analysis tools, photo documentation, saved sessions, and exportable data. Use it to quickly understand room noise, monitor target levels, track peaks, and capture setup photos with optional dB overlays. Features include: -Live sound level meter with dBA, dBC, and dBZ weighting -Real-time frequency spectrum display -RTA bars, spline, and spectrogram views -Dominant frequency and selected band tracking -Fast, slow, and impulse response options -Leq, average, max, peak, and session duration stats -Dosimeter-style noise exposure view -Camera mode with sound-level overlay and filters -Save and export session data -Calibration offset controls -Clean navy, yellow, and white professional interface TheoMeter is ideal for sound technicians, event volunteers, venue setup teams, educators, presenters, and anyone who needs a clear view of sound levels and frequency behavior in a room. Note: TheoMeter uses the iPhone microphone for practical sound analysis. For compliance-grade measurements, use a professionally calibrated sound level meter.

Turn your Sonos speakers into a whole-home intercom. THREE WAYS TO BE HEARD • Live — start a continuous microphone connection without holding a button • Message — record a short announcement, then send it • Sounds — play ready-made household, attention, and ambience sounds ONE ROOM OR MANY Choose one room, select several rooms, or reach everywhere. Holler temporarily groups compatible rooms so announcements stay synchronized. LEAVES YOUR SONOS SYSTEM THE WAY IT FOUND IT When an announcement ends, Holler restores each room's previous grouping, playback, and volume whenever the speaker makes that state available. LOCAL AND PRIVATE BY DESIGN Holler works directly with speakers on your Wi-Fi. There is no Holler account, advertising, tracking, or Holler-operated audio relay. Remote broadcasting from outside your reachable home network is not supported. Keep Holler open while using Live. If the app leaves the foreground or the microphone is interrupted, Holler stops the broadcast and restores your Sonos system. TRY EVERYTHING All features are available during the seven-day trial. Afterward, one lifetime purchase unlocks Holler permanently—no subscription. Holler requires compatible Sonos speakers on a network your iPhone or iPad can reach. Sonos S1 and S2 systems remain separate and cannot be grouped together. Holler is an independent app and is not affiliated with, endorsed by, or sponsored by Sonos, Inc. Sonos is a trademark of Sonos, Inc. Included alarm and siren sounds are provided for entertainment and attention-getting use only. Holler is not an emergency warning or life-safety system.