# ST op vs TDK

The clearest difference is rating: TDK at 5.0 against ST op's 1.0. TDK also leads on update cadence (every 2 months vs every 6 months) and ratings volume (3 vs 1). ST op's advantage is iOS requirement (8.0 vs 15.0). 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 holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

ST op ships an update every 6 months, TDK every 2 months. The most recent releases landed on September 22, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | ST op | TDK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/st-op-amps/id574823376/reviews) | **[5.0 (3 ratings)](https://appshunter.io/ios/app/tdk-lambda/id1487966383/reviews)** |
| Number of ratings | 1 | **3** |
| Positive reviews | 60.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 months** |
| Monetization | Free | Free |
| Size | 93 MB | 14 MB |
| Requires iOS | **8.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [STMicroelectronics](https://appshunter.io/developer/1801774735) | [TDK-Lambda Americas Inc.](https://appshunter.io/developer/1487966382) |

## What reviewers say

### ST op

[App page](https://appshunter.io/ios/app/st-op-amps/id574823376)

This app helps engineers select operational amplifiers, comparators, and current sense amplifiers for their projects. It provides datasheets, common schematics, and package dimensions.

**Highlights:** Operational amplifier product selector, Downloadable datasheets, Commonly used schematics, Compensation methods information, Package mechanical dimensions

**Features:** macOS Compatibility

**In-app purchases:** none


### 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


## Frequently asked questions

### Is ST op free?

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

### Is TDK free?

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

### Which has better reviews, ST op or TDK?

TDK is rated higher. ST op averages 1.0 out of 5 from 1 ratings, while TDK averages 5.0 from 3 ratings.

### Do ST op or TDK have ads?

Neither ST op nor TDK shows ads.

### Which is updated more often, ST op or TDK?

ST op ships an update every 6 months, and TDK every 2 months. Most recently, ST op was updated on September 22, 2026 and TDK on October 2, 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.*