Comparison

RK Link vs Guardhat

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

Head to head
About

RK Link

Connect a portable gas monitor to your smartphone via Bluetooth to receive real-time alerts for gas, man-down, and panic alarms. Automatically send emergency emails with location data to up to 100 registered destinations. View gas concentrations and adjust device settings remotely.

Highlights
  • Real-time alarm alerts (gas, man-down, panic)
  • Automatic emergency email notifications
  • GPS location data in alerts
  • Gas concentration display
  • Remote device setting changes
  • Up to 100 email destinations
Features
Read full description

RK Link is a basic application for connecting a RIKEN KEIKI portable gas monitor to a smartphone. By pairing with a detector via Bluetooth, you can automatically send an email when an alarm occurs. Up to 100 destinations can be registered. You can quickly notify third parties of emergencies. You can also display the gas concentration and change the gas detector settings. ・ Alarm real-time alert An e-mail is automatically sent when various alarms such as gas alarm, man-down alarm and panic alarm are issued. Gas alarm: An alarm sounds when the gas concentration reaches the danger zone. Man-down alarm: If a worker does not move for a certain period of time due to a disaster or accident other than gas, an alarm will sound automatically. Panic alarm: By manually sounding the alarm, the operator can inform the surroundings of danger and ask for help. Failure alarm: An alarm sounds when the gas detector does not operate normally, such as when the battery is dead or the circuit is broken. Remind alert: An alarm sounds when the regular inspection of the gas detector has expired, such as the calibration deadline or bump deadline, and tells you when to perform regular inspections. In addition to alarm types and gas concentrations, e-mails can also be used to send location information using a smart phone's GPS and a management number that is set arbitrarily. ・ Gas concentration display Acquires measurement data from the connected gas detector and displays the gas concentration. ・ Change various settings Gas detector settings such as alarm points, display language, and calibration deadline can be changed. You can also set an arbitrary management number on the main unit or application.

About

Guardhat

This app transforms your phone into a safety and collaboration tool for industrial environments. It offers features like SOS alerts, fall detection, and secure communication to enhance worker safety and efficiency.

Highlights
  • SOS and worker-down alerts
  • Fall detection
  • Proximity and geofence violation alerts
  • Audio-visual calling and PTT
  • Lone worker check-ins
  • Gas detection monitoring
Features
Read full description

Guardhat technology is built with a single purpose: to solve real-world industrial problems, with a human-centric perspective. The Guardhat iOS app works with the Guardhat Platform and Guardhat Solutions to turn your phone into a cutting-edge tool for work safety and collaboration. The Guardhat app provides core safety functionality including SOS, fall detection, worker-down, proximity detection, geofence violation and evacuation alerts to workers on the frontline as well as their support, engineering and/or emergency response teams anywhere in the world. It also comes with full audio-visual calling, multi-channel, dynamic PTT, and secure media capture and storage – to make hazardous work easier and faster even as it makes work safer. The app is a compatible frontline device for use with the Guardhat Lone Worker solution, which provides additional automated alerts and functionality around check-ins and visibility for those who work alone, distributed, or in remote locations to ensure they get home safe at the end of each shift. Gas detection & analytics features within the Guardhat Worker Condition Monitoring solution are also compatible with the app to track wearable/mobile gas detector status and alerts in real-time to create and manage a connected fleet of smart detectors to prevent exposure events and respond to incidents more swiftly and effectively. The Guardhat App harnesses the full power of sensors and communication capabilities built into the iPhone to provide critical safety and productivity features to frontline workers. For continuous protection, the app requires permission to be granted via iOS settings to use the camera, microphone, location, Bluetooth and local network, even while the app is in the background (i.e. Always On). Ensuring privacy and keeping control in the hands of the user are guiding principles for the Guardhat app. The list of features and required privacy settings (iOS Settings > Privacy) are provided below to help you decide how you would use the app. 1. Lone worker timed check-ins (uses location for emergency response, even while running in the background; “Always On” setting needed for Location) 2. AV Communications (uses local network even while running in the background; “Always On” setting needed for Local Network)  3. Incident management, including nearby worker alerts (uses location for emergency response, even while running in the background; “Always On” setting needed for Location)
 4. Controlled access zoning, including evacuation, mustering and offline geofencing (uses location for emergency response, even while running in the background; “Always On” setting needed for Location) 5. Fall detection (uses location for emergency response, even while running in the background; “Always On” setting needed for Location) 6. Worker condition monitoring, including gas detection (uses location for emergency response, Bluetooth pairing with gas detectors to alert when high gas is detected, even while running in the background;  “Always On” setting needed for Location and Bluetooth). As the ecosystem of Guardhat device integrations grows, the Guardhat app will offer more functionality for new devices and to meet frontline worker needs as part of the leading platform covering the last mile to the frontline worker.

Screenshots

RK Link3 screens
Guardhat4 screens

Verdict

The call

RK Link and Guardhat are too close to call on the numbers: across 9 compared parameters — price, rating, ratings volume and update cadence among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.

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

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for RK Link against 5.0 for Guardhat. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

RK Link ships an update every 4 months, Guardhat every 2 months. The most recent releases landed on September 14, 2026 and September 11, 2026 respectively.

ScorecardNo meaningful differences
RK Link versus Guardhat: the parameters behind the verdict, then further details
ParameterRK LinkGuardhat
PriceFreeFree
Rating5.0 (1 ratings)5.0 (1 ratings)
Number of ratings11
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationFreeFree
DevicesiPhone, iPad, iPod — betteriPhone, iPod
Requires iOS13.0 — better14.0
Further details — not scored
Size16 MB33 MB
Age rating4+4+
Developer理研計器株式会社Guardhat Inc.

Customer experience

RK Link

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Guardhat

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

RK Link

No in-app purchases

None

Guardhat

No in-app purchases

Questions

Is RK Link free?
RK Link is free to download, with no in-app purchases.
Is Guardhat free?
Guardhat is free to download, with no in-app purchases.
Which has better reviews, RK Link or Guardhat?
RK Link and Guardhat are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do RK Link or Guardhat have ads?
Neither RK Link nor Guardhat shows ads.
Which is updated more often, RK Link or Guardhat?
RK Link ships an update every 4 months, and Guardhat every 2 months. Most recently, RK Link was updated on September 14, 2026 and Guardhat on September 11, 2026.

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