SMART Mirror vs Cepstrum
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- Wireless screen mirroring
- Connect via code
- Compatible with SMART Boards
- iQ embedded computing support
- Easy setup
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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).
Cepstrum
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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
Verdict
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
Both are free to download. Cepstrum sells 1 one-off in-app purchase. SMART Mirror asks for nothing beyond the download.
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.
| Parameter | SMART Mirror | Cepstrum |
|---|---|---|
| Price | Free | Free |
| Rating | 2.9 (15 ratings) — better | — |
| Positive reviews | 20.8% of reviews | — |
| Number of ratings | 15 — better | — |
| Update frequency | Every 3 months | Every 2 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPod | iPhone, iPad |
| Requires iOS | 14.0 — better | 18.0 |
| Further details — not scored | ||
| Size | 59 MB | 9 MB |
| Age rating | 4+ | 4+ |
| Developer | SMART Technologies | Tongkun Lan |
In-app purchases
SMART Mirror
No in-app purchases
Cepstrum
- Cepstrum$4.99
Questions
Is SMART Mirror free?
Is Cepstrum free?
Do SMART Mirror or Cepstrum have ads?
Which is updated more often, SMART Mirror or Cepstrum?
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