Comparison

SMART Mirror vs Cepstrum

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

Head to head
About

SMART Mirror

Wirelessly mirror your device's screen to a compatible interactive display. Simply open the app, enter a connection code, and start sharing your content instantly.

Highlights
  • Wireless screen mirroring
  • Connect via code
  • Compatible with SMART Boards
  • iQ embedded computing support
  • Easy setup
Read full description

SMART Mirror makes it easy to quickly display what’s on your screen to a compatible SMART Board® interactive display with iQ embedded computing. How it works: - Open the SMART Mirror app - Enter the connection code displayed on the SMART Board with iQ’s screen - Begin sharing This app requires a SMART Board interactive display with SMART Mirror receiver (version 4.32.2 or greater).

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

SMART Mirror3 screens
Cepstrum3 screens

Verdict

The call

The clearest difference is in-app purchases: SMART Mirror at none against Cepstrum's 1. SMART Mirror also leads on iOS requirement (14.0 vs 18.0). Cepstrum's advantage is update cadence (every 2 days vs every 3 months). On price, ads 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. Cepstrum sells 1 one-off in-app purchase. SMART Mirror asks for nothing beyond the download.

UpkeepUpdate frequency

SMART Mirror ships an update every 3 months, Cepstrum every 2 days. The most recent releases landed on October 14, 2026 and October 3, 2026 respectively.

Scorecard3 real differences · 7 level
SMART Mirror versus Cepstrum: the parameters behind the verdict, then further details
ParameterSMART MirrorCepstrum
PriceFreeFree
Rating2.9 (15 ratings) — better—
Positive reviews20.8% of reviews—
Number of ratings15 — better—
Update frequencyEvery 3 monthsEvery 2 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhone, iPodiPhone, iPad
Requires iOS14.0 — better18.0
Further details — not scored
Size59 MB9 MB
Age rating4+4+
DeveloperSMART TechnologiesTongkun Lan

In-app purchases

None

SMART Mirror

No in-app purchases

1 purchases

Cepstrum

One-time1
  • Cepstrum$4.99

Questions

Is SMART Mirror free?
SMART Mirror is free to download, with no in-app purchases.
Is Cepstrum free?
Cepstrum is free to download, with in-app purchases available.
Do SMART Mirror or Cepstrum have ads?
Neither SMART Mirror nor Cepstrum shows ads.
Which is updated more often, SMART Mirror or Cepstrum?
SMART Mirror ships an update every 3 months, and Cepstrum every 2 days. Most recently, SMART Mirror was updated on October 14, 2026 and Cepstrum on October 3, 2026.

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