Comparison

Universal BMS vs Sound Meter

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Universal BMS

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English BMS App connects to your smart BMS units and smart balancers over Bluetooth and shows your battery status in real time. Fully English interface, clean design. FEATURES • Live monitoring — Total voltage, current, power, state of charge (SOC), and remaining capacity on one screen. • Cell details — Per-cell voltage, highest/lowest cell delta, and balancing status. • Temperature tracking — Sensor temperatures and MOSFET status. • Protection info — View overvoltage, undervoltage, overcurrent, and temperature protection thresholds. • Edit settings — Change protection thresholds from the app. • Logging — Save measurements as CSV and share anytime. • Demo mode — Try the app without a device. No Bluetooth required. • Light and dark theme — Switches automatically by time of day. LANGUAGES The app UI is available in 18 languages: Turkish, Azerbaijani, English, German, Spanish, French, Italian, Polish, Portuguese, Russian, Bulgarian, Serbian, Croatian, Bosnian, Romanian, Albanian, Greek, and Macedonian. In App Store regions without a dedicated store listing language (e.g. Azerbaijan, North Macedonia), you may see the English or Turkish store page — the matching language is still selectable inside the app. SUPPORTED DEVICES The app works over Bluetooth with supported smart BMS units and smart balancers. The compatible device list is updated in the app. WHO IT’S FOR Solar installers, van and boat owners, EV conversion builders, and anyone using LiFePO4 battery packs. ABOUT SUBSCRIPTIONS All features are free. The optional subscription only removes ads; it does not lock any features. PRIVACY Your battery measurements stay on your phone and are not sent to a server. Privacy policy: https://twarge.co/gizlilik-politikasi

About

Sound Meter

Features
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Turn your iPhone into a smart sound measurement tool: measure noise, find frequencies, compare changes and create reports. Most sound meters just show a number. Sound Meter tells you what it means and what to do next. MEASURE • Live dB with A, C and Z weighting and Fast, Slow or Impulse response • Average (Leq), minimum, maximum and peak, with a 60-second graph • Plain answers: "43 dBA · Quiet, like a library" • Guided modes for Noise, Machine, Speaker and Room set everything up for you FIND • Spectrum analyzer with the dominant frequency and likely sources ("126 Hz · Low hum — check fans, compressors, fridges") • Tap to pick any frequency, pinch to zoom, freeze and peak hold • Find mode: lock a frequency, walk around and follow "Getting louder" to the source COMPARE • Save sessions and measure Before / After from the same spot • See exactly what changed: "Noise reduced −8.5 dBA average, largest change at 125 Hz" • Great for HVAC work, soundproofing, speakers, fans and machines REPORT • PDF measurement report with levels, graph, spectrum, events, device, microphone and calibration • CSV data and PNG image export MONITOR • Set a threshold and get notified when noise stays above it • Event log with times and maximum levels, even while the phone is locked NUMBERS YOU CAN TRUST • Calibration wizard: match a reference meter or acoustic calibrator in a minute • Measurement Quality shows why a reading is Good, Fair or Poor — clipping, noise floor, microphone route, calibration • USB measurement microphones and wired headsets supported ALSO • RTA in 1/1 and 1/3 octave bands • Tone generator: sine, pink noise, white noise and sweeps PRIVATE BY DESIGN Audio is analyzed live on your iPhone. It is never recorded, stored or sent anywhere. No ads, no account, no tracking. PRO — ONE-TIME PURCHASE Find mode, Before / After, noise monitor, PDF and CSV export, 1/3-octave RTA, unlimited sessions, calibration for every microphone and the full generator. Pay once, no subscription. Sound Meter is a measurement reference, not a certified sound level meter (IEC 61672). For legal or occupational compliance, use a certified instrument. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://bmit-mob.web.app/sound-meter/privacy-policy.html

Screenshots

Universal BMS4 screens
Sound Meter4 screens

Verdict

The call

The clearest difference is in-app purchases: Universal BMS at none against Sound Meter's 1. Sound Meter's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Sound Meter sells 1 one-off in-app purchase. Universal BMS asks for nothing beyond the download.

Scorecard2 real differences · 4 level
Universal BMS versus Sound Meter: the parameters behind the verdict, then further details
ParameterUniversal BMSSound Meter
PriceFreeFree
Update frequencyEvery 5 weeks—
AdsYesNo — better
In-app purchasesNo — betterYes
DevicesiPhone, iPad — betteriPhone
Requires iOS16.4 — better17.0
Further details — not scored
Size47 MB4 MB
Age rating4+4+
DeveloperTW BİLİŞİM MÜHENDİSLİK DANIŞMANLIK SANAYİ VE TİCARET LİMİTED ŞİRKETİNguyen SonTung

In-app purchases

None

Universal BMS

No in-app purchases

1 purchases

Sound Meter

One-time1
  • Sound Meter Pro$9.99

Questions

Is Universal BMS free?
Universal BMS is free to download, with no in-app purchases.
Is Sound Meter free?
Sound Meter is free to download, with in-app purchases available.
Do Universal BMS or Sound Meter have ads?
Universal BMS shows ads; Sound Meter does not.

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