Zenn OTP vs OTEC
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Zenn OTP
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This application generates one-time passwords for devices and services which developed by Zenn.
OTEC
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Designed for professional metal polishing, OTEC gives you a smarter, faster and more precise way to manage your workflows. Key Features • Seamless Bluetooth connection to your EF-One or EF-Nova • Adjust processing parameters directly from the app • Save custom settings for consistent, repeatable results • Create and manage Recipes for specific workpieces, including time, speed & voltage • Improve efficiency with quick access to your preferred polishing processes With OTEC, you can bring precision, repeatability and maximum convenience to your surface-finishing operations—right from your smartphone.
Screenshots
Verdict
The clearest difference is device support: OTEC at 3 against Zenn OTP's 1. OTEC also leads on iOS requirement (14.0.0 vs 16.4). On price, update cadence, ads and in-app purchases 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. Neither carries in-app purchases, so what you see is what you pay.
Zenn OTP ships an update every 6 weeks, OTEC monthly. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.
| Parameter | Zenn OTP | OTEC |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 weeks | Monthly — better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 14.0.0 — better |
| Further details — not scored | ||
| Size | 32 MB | 24 MB |
| Age rating | 4+ | 4+ |
| Developer | Zenn | OTEC Präzisionsfinish GmbH |
In-app purchases
Zenn OTP
No in-app purchases
OTEC
No in-app purchases
