Version 4.0 introduces a full version. dB Logger is now free to download and fully usable for live measurement — the real-time meter, gauge, spectrum, spectrogram, analyzer and dosimeter are all free and unlimited. The free version also lets you record, export and film video for up to 30 seconds, so you can try the whole workflow; those trial clips, exports and reports carry a small "Trial" mark, and the free version keeps two days of dosimeter history. Unlock the full version with a single one-time purchase — no subscription, ever — for unlimited recording, unlimited CSV/WAV/PDF export, full-length video with no watermark, the full dose history, and no ads. If you already bought "Remove Ads", thank you — you're upgraded to the full version automatically at no charge; just tap Restore Purchases in Settings if it doesn't show right away. Thanks for the feedback — keep it coming at bekserviceltd@gmail.com.

Version 3.7 adds detail to the graphs. The equalizer/analyzer now has a third zoom level: tap it to cycle 1/1 → 1/3 → 1/6 octave bands, where 1/6 (61 bands from 20 Hz to 20 kHz) helps you separate close tones — the chip top-right shows the current mode. On the spectrogram you'll find a new draggable frequency cursor: grab the horizontal line and slide it up or down onto a bright streak to read off that streak's frequency, shown live in Hz/kHz. The line is dashed so the streak stays visible underneath, and the knob lights up while you're holding it. Horizontal swipes still page between graphs as before. Thanks for the feedback — keep it coming at bekserviceltd@gmail.com.

Version 3.5 introduces Remote measurement — use one device as a wireless probe and measure from another. Turn any iPhone or iPad into a probe that streams its calibrated microphone over your Wi-Fi network, then measure the sound on a second device as if the mic were its own, calibration and all. Tap the microphone badge on the meter to Share this device's mic or Connect to a nearby one — nearby probes appear automatically, or you can type an IP address. If the probe stops sharing or goes out of range, the app falls back to your own microphone automatically. This version also makes the app display in your language: if your device wasn't set to English the interface was appearing in English, and it's now fully translated across all supported languages. Plus startup and stability fixes. Thanks for the feedback — keep it coming at bekserviceltd@gmail.com.

Version 3.3 is a big round of fixes and refinements from your feedback. Calibration status now reads consistently across every device: it shows "Preset" when your exact model has a built-in calibration value, and "Using default calibration" otherwise. The dosimeter's Start, Pause, Reset and Save buttons now match the main meter, and both the dose screen and the dose report show when measurement started and when the report was generated. There's a new Help section explaining where your device's microphone is and how to aim it for accurate readings. You can now check for updates from Settings, the Diagnostics screen shows the microphone currently in use, and you can delete a recording straight from its details screen. We also fixed Restore Purchases so it no longer triggers a store sign-in prompt every time you open Settings. Thanks for the feedback — keep it coming at bekserviceltd@gmail.com.

Version 3.2 fixes a crash that could happen when you stopped a recording very soon after starting it — recordings now always finish and save cleanly, every time. Thanks for the feedback — keep it coming at bekserviceltd@gmail.com.

Version 3.1 adds a live waveform to the Home screen, so you can see the actual sound as you measure it — it appears the moment you open the app, not only while recording. We've also refined how the app works with external USB measurement microphones: it now follows your iPhone or iPad's live audio route automatically, so the instant you plug in a measurement mic it becomes the active input with its own calibration applied — there's no picker to fumble with — and we've tightened the per-microphone input-gain handling so calibrated levels stay accurate and repeatable. The app is now called "dB Logger" — "dB" is the correct way to write decibels (and avoids being mistaken for a database tool). Thanks for the feedback — keep it coming at bekserviceltd@gmail.com.

Version 3.0 makes external measurement microphones work properly on iPhone and iPad. When you connect a USB measurement mic — such as the Dayton iMM-6C — and pick it in the app, dbLogger now captures that exact microphone. Previously iOS could quietly keep using a different input, so a reading was measured on one mic but calibrated for another; the microphone you choose and the microphone you hear are now always the same one, each with its own calibration. We also stop iOS from over-amplifying a USB mic's input gain, which had been making some external mics read more than 20 dB too high, so your calibrated levels are accurate and repeatable. dbLogger now follows the live audio route, so the mic shown on screen always matches the one actually recording even after you plug or unplug it, and the microphone picker is more reliable across the board. The Diagnostics screen now shows the active input gain and the negotiated capture source to help confirm everything is set up correctly. Thanks for the feedback — keep it coming at bekserviceltd@gmail.com.

Bug fixes and improvements.

Bug fixes and improvements.

A round of fixes from your feedback. The sound-classification label on the meter now appears right away (showing "Listening…" while it settles) instead of looking blank. The microphone icon up top no longer occasionally draws clipped. Exporting a recording as M4A or MP3 now shows a progress dialog with a time estimate and a Cancel button, so a long conversion never looks frozen. External measurement microphones (such as the Dayton iMM-6C) can now always be calibrated — the calibrate option is no longer hidden — and each microphone keeps its own calibration, so calibrating one never changes another. The dosimeter's dose percentage no longer overlaps itself inside the ring, and a steady pure tone is correctly described as a tonal whine rather than an alarm. Plus assorted refinements.

• New Glass look — switch between Glass and Classic in Settings • Redesigned meter dial with a record button that shows elapsed time • Graphs: dB axes, frequency marks (50 Hz–20 kHz), elapsed time and larger readouts • New Z (unweighted) display option and clearer time-weighting labels • Microphone picker now lists measurement-capable mics only, with a live mic indicator • Step-by-step calibration guide in the Calibration Wizard • Rotate the phone 180° to point the bottom mic at the source • Stability fixes — exporting while recording no longer crashes