# TDK vs Idemitsu Smart OC

The clearest difference is update cadence: Idemitsu Smart OC at every 3 weeks against TDK's every 2 months. TDK's advantage is device support (3 vs 1) and iOS requirement (15.0 vs 18.6). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

TDK ships an update every 2 months, Idemitsu Smart OC every 3 weeks. The most recent releases landed on October 2, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | TDK | Idemitsu Smart OC |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tdk-lambda/id1487966383/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 3 weeks** |
| Monetization | Free | Free |
| Size | 14 MB | 15 MB |
| Requires iOS | **15.0** | 18.6 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [TDK-Lambda Americas Inc.](https://appshunter.io/developer/1487966382) | [Idemitsu Kosan Co.,Ltd.](https://appshunter.io/developer/1434377868) |

## What reviewers say

### TDK

[App page](https://appshunter.io/ios/app/tdk-lambda/id1487966383)

Access TDK-Lambda's complete product catalog offline. Browse by category, industry, or search for specific part numbers. This guide puts essential product information at your fingertips.

**Highlights:** Offline product catalog access, Browse by category, Browse by industry, Search by part number, Comprehensive product list

**In-app purchases:** none


### Idemitsu Smart OC

[App page](https://appshunter.io/ios/app/idemitsu-smart-oc/id6736635041)

This app enables on-site lubricant analysis using a smartphone camera. It assesses lubricant degradation and contamination by analyzing photos, providing numerical data to help detect anomalies and ensure stable machinery operation.

**Highlights:** On-site lubricant diagnosis, Photo-based analysis, Degradation status assessment, Contamination level calculation, Historical data access, Early anomaly detection

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is TDK free?

TDK is free to download, with no in-app purchases.

### Is Idemitsu Smart OC free?

Idemitsu Smart OC is free to download, with no in-app purchases.

### Do TDK or Idemitsu Smart OC have ads?

Neither TDK nor Idemitsu Smart OC shows ads.

### Which is updated more often, TDK or Idemitsu Smart OC?

TDK ships an update every 2 months, and Idemitsu Smart OC every 3 weeks. Most recently, TDK was updated on October 2, 2026 and Idemitsu Smart OC on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*