bluSensor vs GTK
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
bluSensor
Monitor temperature, humidity, and air quality with wireless sensors. Get real-time data, alerts, and historical tracking on your smartphone or tablet. Suitable for home and professional environments.
- Real-time environmental monitoring
- Temperature and humidity tracking
- Air quality alerts
- Historical data logging
- Smartphone and tablet compatibility
- Web app access
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Stay informed about temperature, humidity, and air quality with our user-friendly app, designed to pair effortlessly with bluSensor® wireless sensors. Monitor your environment in real-time, receive alerts, and track historical data right from your smartphone, tablet, or using our web app. Ideal for both home and professional use, bluSensor® ensures you're always aware of your surroundings.
GTK
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GTK-Field is a field logging app for geotechnical site investigation. It works alongside you on site: record, describe, photograph, and produce a finished report on the same device. MODULES Trial pit with layer log and profile column Core drilling Dynamic probing Infiltration test Plate load test, dynamic Plate load test, static Sieve analysis with grading curve Sampling with lab tracking Site walkover General survey TO STANDARD Soil description and symbols to EN ISO 14688-1/2, presentation to DIN 4023. Probing to EN ISO 22476-2, sampling to EN ISO 22475-1, infiltration to OENORM B 4422-2. Static plate load test to OENORM B 4417 or DIN 18134, assessment to RVS 08.03.01 and RVS 08.15.01. The standards profile can be switched between Austria and Germany for each project. IN THE FIELD The app works entirely offline. All data stays on the device. Coordinates and elevation come from GPS or are entered by hand, photos belong to the exploration point. Reports are generated as PDF and can be viewed and shared directly on the device. ORDER Exploration points and samples receive sequential identifiers, and sample numbers are unique within a project. A sample register lists every sample of a project, with or without lab results. A combined export summarises the whole project with continuous page numbers. FREE GTK-Field is completely free. No subscription, no unlocking, no ads. NOTE GTK-Field is developed privately and is not a service of a chartered engineering practice. Calculated and estimated values must be checked by the user; professional responsibility for logging and interpretation remains with the user.
Screenshots
Verdict
The clearest difference is update cadence: GTK at every 9 days against bluSensor's every 2 months. On price, ads, in-app purchases and device support 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.
bluSensor ships an update every 2 months, GTK every 9 days. The most recent releases landed on October 13, 2026 and October 14, 2026 respectively.
| Parameter | bluSensor | GTK |
|---|---|---|
| Price | Free | Free |
| Rating | 1.0 (5 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 5 — better | — |
| Update frequency | Every 2 months | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.6 | 15.0 — better |
| Further details — not scored | ||
| Size | 31 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | Almendo Technologies GmbH | Matthias Kroell |
In-app purchases
bluSensor
No in-app purchases
GTK
No in-app purchases









