Comparison

Best Phone Security vs Cepstrum

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

Head to head
About

Best Phone Security

This app triggers an alarm when your device is touched or moved, deterring unauthorized access. It offers a PIN code for unlocking and a security alarm to notify you of any tampering. Ideal for protecting your device in public or from prying eyes.

Highlights
  • PIN code unlock
  • Security alarm notification
  • Motion-triggered alarm
  • Deterrent against unauthorized access
Features
Read full description

------------------------------------------------------ Don't wait! Protect Your iPhone/iPad Now! ------------------------------------------------------ Use alarm on your iPhone/ipod/ipad when in public or also to catch those sneaky friends and family who try to peek into your iPhone when you're away. What really happens when you're in the shower, sleeping, or just away from your device. Use this high quality app to trigger an alarm. Best part is if your friends or family know you have an advanced alarm they will never dare to touch the phone. They will be frightened to touch it a second time and so its an excellent deterrent. FEATURES: - Pin Code to unlock your iPhone & iPad - Security Alarm To Notify You - Alarm Triggered Thru Motion

About

Cepstrum

Features
Read full description

That hum in your bedroom at night. The bass leaking through the wall. The "quiet" air purifier that isn't. Cepstrum shows you exactly what you're hearing — a live picture of sound, measured with nothing but your iPhone. SEE THE NOISE, NOT JUST HEAR IT A real-time spectrum from deep bass to the top of your hearing, with a sharpened spectrogram that turns tones into crisp lines. Point it at a mystery sound and get its fingerprint: the fridge hum at 50/60 Hz, the fan bearing whining at 4 kHz, the feedback frequency before it screams at your venue. KNOW HOW LOUD IT REALLY IS A proper sound level meter with A/C/Z weighting and Fast, Slow and Impulse response. Is the gym actually too loud? The restaurant? Your kid's headphones? Set the offset against a meter you trust and read real dB SPL — not a guess. PROVE THE DIFFERENCE Capture a measurement, overlay another, and read the change in decibels. Did the new windows cut the street noise? Is the replacement fan quieter than the old one? Before and after, one seat against another — the answer on screen, not in your head.

Screenshots

Best Phone Security4 screens
Cepstrum3 screens

Verdict

The call

The clearest difference is ads: Cepstrum at none against Best Phone Security's shown. Cepstrum also leads on update cadence (every 2 days vs every 3 months). Best Phone Security's advantage is iOS requirement (15.0 vs 18.0). On price, in-app purchases and device support 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. Best Phone Security sells 1 one-off in-app purchase and Cepstrum sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Best Phone Security ships an update every 3 months, Cepstrum every 2 days. The most recent releases landed on October 26, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
Best Phone Security versus Cepstrum: the parameters behind the verdict, then further details
ParameterBest Phone SecurityCepstrum
PriceFreeFree
Rating4.6 (3K ratings) — better—
Positive reviews68.6% of reviews—
Number of ratings3K — better—
Update frequencyEvery 3 monthsEvery 2 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.0 — better18.0
Further details — not scored
Size59 MB9 MB
Age rating4+4+
DeveloperRV AppStudios LLCTongkun Lan

Bugs and requests

Best Phone Security

Reported bugs

3 issues
  • Alarm doesn't always trigger
  • Doesn't work as expected when phone is locked
  • Crashes frequently

Requested features

4 requests
  • Take photo of intruder
  • Send alert notifications
  • Louder alarm
  • Ability to lock app with passcode

Cepstrum

Not enough reviews yet to summarise bugs or requests.

In-app purchases

1 purchases

Best Phone Security

One-time1
  • Unlock New Features$4.99
1 purchases

Cepstrum

One-time1
  • Cepstrum$4.99

Questions

Is Best Phone Security free?
Best Phone Security is free to download, with in-app purchases available.
Is Cepstrum free?
Cepstrum is free to download, with in-app purchases available.
Do Best Phone Security or Cepstrum have ads?
Best Phone Security shows ads; Cepstrum does not.
Which is updated more often, Best Phone Security or Cepstrum?
Best Phone Security ships an update every 3 months, and Cepstrum every 2 days. Most recently, Best Phone Security was updated on October 26, 2026 and Cepstrum on October 3, 2026.

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