Comparison

Watchlog Bluetooth vs Datum Link

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Watchlog Bluetooth

This application facilitates Bluetooth connections for data collection from specific sensors. It is designed to work seamlessly with Hydrotechnik sensors, enabling efficient data transfer and management.

Highlights
  • Bluetooth connectivity
  • Hydrotechnik sensor support
  • Data collection
  • Data management
Features
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Bluetooth connection app for use with Hydrotechnik sensors.

About

Datum Link

Features
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Datum Link – Precision Measurement & Data Logging Datum Link is a professional mobile application designed for real-time monitoring, data acquisition, and analysis of Datum Electronics precision measurement devices. This app combines the functionality of two existing Datum Electronics apps, Auger Hawk and Datum Connect, into a single, streamlined platform, making device management and data logging simpler and more efficient. Key Features: Multi-Device Support • Compatible with multiple Datum Electronics precision measurement devices • WiFi and Serial connectivity options • Real-time data streaming and monitoring Advanced Monitoring • Live measurement displays for key parameters • Customisable alarm thresholds with audio alerts • Visual warning indicators for critical measurements • Real-time graph visualisation with interactive legend keys Jobs & Log Organisation • Job management system to organise and group logs • Create, rename, and delete jobs with logs grouped under each job • Animated two-state UI for navigating between jobs and logs • Editable log detail fields: manufacturer, model, and log type • Target torque and target depth fields per log Comprehensive Data Logging • Start/stop logging directly from the main page with a toggle button • Job logging indicator showing active logging status and current job name • Log measurements with customisable intervals • Geolocation tracking integration for field measurements • Export logs in CSV or SSV formats • Email logs directly from the app PDF Report Generation • Generate PDF reports from job logs • In-app report preview with responsive page rendering and multi-report navigation • Summary and detail pages with torque/depth graphs, target lines, and metadata tables • Configurable report header image in settings • Email reports directly from the preview page Professional Configuration • Device-specific settings and calibration • Network configuration for Wi-Fi devices • Firmware configuration for 425 devices • Persistent settings per device type Built for Professionals • Portrait-optimised interface for field use • Offline data collection capabilities • Batch log management • Industrial-grade reliability Whether you're conducting quality assurance tests, monitoring production equipment, or collecting field data, Datum Link provides seamless connectivity to Datum Electronics precision measurement devices, enabling accurate measurement, real-time monitoring, and comprehensive data management – now combining the best features of Auger Hawk and Datum Connect in one place. Note: Compatible devices and features may vary. Wi-Fi connectivity requires compatible network configuration.

Screenshots

Watchlog Bluetooth4 screens
Datum Link2 screens

Verdict

The call

Watchlog Bluetooth and Datum Link 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.

Scored on Price Ā· Rating Ā· Positive reviews Ā· Number of ratings Ā· Update frequency Ā· Ads Ā· In-app purchases Ā· Monetization Ā· Best chart rank Ā· Devices Ā· Requires iOS

CostPrice Ā· In-app purchases Ā· Ads Ā· Monetization

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

UpkeepUpdate frequency

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on September 23, 2026 and October 9, 2026 respectively.

ScorecardNo meaningful differences
Watchlog Bluetooth versus Datum Link: the parameters behind the verdict, then further details
ParameterWatchlog BluetoothDatum Link
PriceFreeFree
Positive reviews100.0% of reviews—
Update frequencyEvery 2 monthsEvery 2 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.0 — better14.2
Further details — not scored
Size25 MB69 MB
Age rating4+4+
DeveloperHydrotechnik UK Test Engineering LtdDATUM ELECTRONICS LTD

In-app purchases

None

Watchlog Bluetooth

No in-app purchases

None

Datum Link

No in-app purchases

Questions

Is Watchlog Bluetooth free?
Watchlog Bluetooth is free to download, with no in-app purchases.
Is Datum Link free?
Datum Link is free to download, with no in-app purchases.
Do Watchlog Bluetooth or Datum Link have ads?
Neither Watchlog Bluetooth nor Datum Link shows ads.
Which is updated more often, Watchlog Bluetooth or Datum Link?
Watchlog Bluetooth ships an update every 2 months, and Datum Link every 2 months. Most recently, Watchlog Bluetooth was updated on September 23, 2026 and Datum Link on October 9, 2026.

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