Retgen vs NVH Source Locator
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Retgen
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Retgen is a Remote Monitoring System for Power Plants. It allows you to monitor real-time production, consumption, inverter outputs, statuses, and many other data of solar power plants (GES), rooftop solar systems, wind power plants (RES), hydroelectric power plants (HES), or biomass power plants, as well as alarm states and faults occurring at the plants. With the Retgen mobile application: *Management Company users can view the following information of the plants they monitor: -Total production -Generated alarms -Work orders (for Management Companies with the work order module enabled) *Investor users can view the following information for their own plants: -List of plants and their total production -Generated alarms
NVH Source Locator
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NVH Source Locator is a TDOA-based measurement tool for finding noise and vibration sources in structures using accelerometer signals captured on your oscilloscope or measurement system. Built for NVH engineers, automotive diagnostics, machinery troubleshooting, and structural analysis. Works fully offline — no data leaves your device. HOW IT WORKS Place 2–6 accelerometers on a structure, capture the time difference between sensors when they detect the noise/vibration event, and the app calculates where the source is. More sensors mean more precise localization: - 2 sensors → distance along a line - 3 sensors → 2D position - 4 sensors → 3D position - Up to 6 sensors with over-determined least-squares solver for maximum accuracy FEATURES - Seven measurement modes: 2-Sensor, 3-Sensor, 3-Sen+, 4-Sensor, 4-Sen+, 3D, 3D+ - Sound speed library with 100+ engineering materials (metals, polymers, glass, fluids) - Temperature compensation for 14 commonly-used metals (Aluminum, Steel, Copper, etc.) - Custom material support — calibrate in-situ and save the result - Photo annotation — overlay sensor markers on a photo of your setup - PDF report generation with custom header for your company - Backup & restore of all settings, custom materials, favorites, and history FULLY LOCALIZED Complete app interface and on-device user guide in 30 languages: English, Deutsch, Español, Français, Italiano, Português, Polski, Čeština, Slovenčina, Русский, Magyar, Hrvatski, Български, Беларуская, Svenska, Norsk, Suomi, Română, Türkçe, 中文, 日本語, 한국어, العربية, فارسی, हिन्दी, ไทย, Tiếng Việt, Bahasa Indonesia, Bahasa Melayu, Filipino. Complete online documentation at nvh.evdiag.net mirrors the in-app help in every language. FREE VS PRO The 2-Sensor mode is fully free with no limits. Pro unlocks all advanced modes (3-Sensor through 3D+), photo annotation, PDF reports, custom materials, and backup/restore — a single one-time purchase, lifetime access. WHO IT'S FOR - NVH engineers in automotive, aerospace, and electric vehicle development - Diagnostic specialists tracking down rattles, squeaks, and vibration sources - Structural analysts and acoustic consultants - Machinery maintenance teams locating bearing failures and resonance issues PRIVACY NVH Source Locator works entirely offline. No measurement data leaves your device. No analytics, no tracking. Developed by EVDiag. Full user manual at https://nvh.evdiag.net
Screenshots
Verdict
The clearest difference is in-app purchases: Retgen at none against NVH Source Locator's 1. NVH Source Locator's advantage is update cadence (every 4 days vs every 2 weeks). On price, ads, device support and iOS requirement 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. NVH Source Locator sells 1 one-off in-app purchase. Retgen asks for nothing beyond the download.
Retgen ships an update every 2 weeks, NVH Source Locator every 4 days. The most recent releases landed on October 17, 2026 and October 7, 2026 respectively.
| Parameter | Retgen | NVH Source Locator |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Every 4 days — better |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15 | 15.0 |
| Further details — not scored | ||
| Size | 43 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Rast Teknoloji | Roman Franta |
In-app purchases
Retgen
No in-app purchases
NVH Source Locator
- NVH Source Locator Pro$19.99









