# ZENTRA Field vs tTEM controller

ZENTRA Field and tTEM controller are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

ZENTRA Field ships an update every 7 months, tTEM controller every 4 months. The most recent releases landed on September 23, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | ZENTRA Field | tTEM controller |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/zentra-field/id1457752006/reviews)** | — |
| Number of ratings | **2** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 7 months | **Every 4 months** |
| Monetization | Free | — |
| Size | 29 MB | 35 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [METER Group, Inc.](https://appshunter.io/developer/1792460527) | [Temcompany ApS](https://appshunter.io/developer/1700820640) |

## What reviewers say

### ZENTRA Field

[App page](https://appshunter.io/ios/app/zentra-field/id1457752006)

Access and analyze your field data remotely with custom charts and real-time notifications. This app helps you monitor site conditions, track important trends, and reduce manual data processing.

**Highlights:** Customizable field data charts, Real-time data visualization, Out-of-range data notifications, Device battery status checks, Near real-time site condition monitoring, Works with ZENTRA Cloud

**Features:** macOS Compatibility

**In-app purchases:** none


### tTEM controller

[App page](https://appshunter.io/ios/app/ttem-controller/id6739423328)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is ZENTRA Field free?

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

### Is tTEM controller free?

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

### Do ZENTRA Field or tTEM controller have ads?

Neither ZENTRA Field nor tTEM controller shows ads.

### Which is updated more often, ZENTRA Field or tTEM controller?

ZENTRA Field ships an update every 7 months, and tTEM controller every 4 months. Most recently, ZENTRA Field was updated on September 23, 2026 and tTEM controller on September 29, 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.*