ST op vs TDK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ST op
This app helps engineers select operational amplifiers, comparators, and current sense amplifiers for their projects. It provides datasheets, common schematics, and package dimensions.
- Operational amplifier product selector
- Downloadable datasheets
- Commonly used schematics
- Compensation methods information
- Package mechanical dimensions
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STMicroelectronics’ "ST op-amps" application allows you to select the appropriate operational amplifiers, comparators, high-speed amplifiers and current sense amplifiers for your application using the product selector. Datasheets can be downloaded to provide more information about each part. The application provides additional information such as the most used schematics, compensation methods or package mechanical dimensions.
TDK
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.
- Offline product catalog access
- Browse by category
- Browse by industry
- Search by part number
- Comprehensive product list
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TDK-Lambda’s product guide, accessible without Wi-Fi, provides TDK-lambda’s catalog at the tip of your hands. Browse through the comprehensive product list by category, industry, or simply search for a specific part number.
Screenshots
Verdict
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.
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.
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.
| Parameter | ST op | TDK |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (1 ratings) | 5.0 (3 ratings) — better |
| Positive reviews | 60.0% of reviews | — |
| Number of ratings | 1 | 3 — better |
| Update frequency | Every 6 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 8.0 — better | 15.0 |
| Further details — not scored | ||
| Size | 93 MB | 14 MB |
| Age rating | 4+ | 4+ |
| Developer | STMicroelectronics | TDK-Lambda Americas Inc. |
Customer experience
ST op
TDK
In-app purchases
ST op
No in-app purchases
TDK
No in-app purchases
