Lecture Viewer vs AcoustiQ
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Lecture Viewer
This voice recording application uses advanced speech recognition to transcribe spoken words into text in real-time with high accuracy. It's designed to transform your voice into written notes efficiently.
- Real-time voice recording
- Speech recognition technology
- High accuracy transcription
- Voice to text conversion
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Lecture translation Transform your voice into text with our state-of-the-art voice recording application. Featuring advanced speech recognition technology, our app transcribes your recordings in real-time with high accuracy
AcoustiQ
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With acoust IQ, sound level measurements can be performed using an iPhone or iPad in combination with a Class 1 microphone. The app supports the entire measurement process – from data collection and integration of metadata to documentation. All relevant information such as images, text, or GPS data can be captured directly during the measurement and linked to the results. The data can then be edited, analyzed, and exported as a report based on templates. The app is aimed at technically experienced users who want to carry out sound measurements easily, reliably, and with minimal effort. The full functionality is only available with a subscription. For subscriptions the standard Apple Terms of Use (EULA) are applicable,(https://www.apple.com/legal/internet-services/itunes/dev/stdeula/). Note: To perform a Class 1 measurement, a suitable microphone is required. We currently support the Microtech Gefell MV240/MKS225. For Class 2 measurements, the UMIK-2 (miniDSP) microphone is supported. Since the internal microphone cannot be calibrated, measurements are only possible with limitations. More microphones will be supported in a future release.
Screenshots
Verdict
The clearest difference is in-app purchases: Lecture Viewer at none against AcoustiQ's 2. Lecture Viewer also leads on update cadence (weekly vs monthly) and iOS requirement (15.1 vs 17.0). 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. AcoustiQ sells 2 in-app purchases, starting at $99.00 per month. Lecture Viewer asks for nothing beyond the download.
Lecture Viewer ships an update weekly, AcoustiQ monthly. The most recent releases landed on November 8, 2026 and November 4, 2026 respectively.
| Parameter | Lecture Viewer | AcoustiQ |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | Weekly — better | Monthly |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 15.1 — better | 17.0 |
| Further details — not scored | ||
| Size | 76 MB | 45 MB |
| Age rating | 4+ | 4+ |
| Developer | Quoc Truong Do | Mueller-BBM Innovation Lab GmbH |
In-app purchases
Lecture Viewer
No in-app purchases
AcoustiQ
- Monthly Plan7 Days trial$99.001 Month
- Annual Plan14 Days trial$999.991 Year









