Elvaco OTC vs S4C
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Elvaco OTC
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The Elvaco OTC App makes configuring and deployment of your devices easy! Features of Elvaco OTC App: - Claim devices and associated keys to your user account. - Scan and write settings to your devices. - Create configuration profiles to facilitate deployment and configuration. - Lock your devices to prevent unauthorized access. Do you have questions or feedback about the app? Feel free to contact info@elvaco.se
S4C
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S4C-FS Service App is used by service people to check sensor readings, perform settings. It uses Bluetooth Low Energy (BLE) to communicate with sensors. Features: * Show Online values: - Flow - Velocity - Pressure - Temperature * Perform Settings: - Flow Settings - Units Settings - Reference Conditions - Factory Settings - Counter Settings - Output Settings
Screenshots
Verdict
The clearest difference is iOS requirement: S4C at 12 against Elvaco OTC's 15.0. 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.
Both ship on a similar rhythm, roughly monthly. Both last shipped on November 7, 2026.
| Parameter | Elvaco OTC | S4C |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly | Monthly |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.0 | 12 — better |
| Further details — not scored | ||
| Size | 14 MB | 35 MB |
| Age rating | 4+ | 17+ |
| Developer | Elvaco AB | SUTO iTEC (China) Co. Ltd |
In-app purchases
Elvaco OTC
No in-app purchases
S4C
No in-app purchases
