Comparison

RK Link vs RKI OPLS

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

RKI OPLS

Monitor readings and detector status for RKI's OPLS detector. Adjust operational parameters remotely. Essential for managing environmental monitoring equipment.

Highlights
  • View detector readings
  • Check detector status
  • Change operation parameters
  • Remote monitoring
  • Device management
Features
Read full description

For RKI’s OPLS detector. View readings and detector status. Change operation parameters

Screenshots

RK Link3 screens
RKI OPLS1 screens

Verdict

The call

The clearest difference is update cadence: RKI OPLS at every 2 months against RK Link's every 4 months. RK Link's advantage is iOS requirement (13.0 vs 16.0). On price, rating, ratings volume and ads 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

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 RKI OPLS. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

RK Link ships an update every 4 months, RKI OPLS every 2 months. The most recent releases landed on September 14, 2026 and September 25, 2026 respectively.

Scorecard2 real differences · 7 level
RK Link versus RKI OPLS: the parameters behind the verdict, then further details
ParameterRK LinkRKI OPLS
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, iPad
Requires iOS13.0 — better16.0
Further details — not scored
Size16 MB55 MB
Age rating4+4+
Developer理研計器株式会社RKI Instruments, Inc.

Customer experience

RK Link

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

RKI OPLS

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

In-app purchases

None

RK Link

No in-app purchases

None

RKI OPLS

No in-app purchases

Questions

Is RK Link free?
RK Link is free to download, with no in-app purchases.
Is RKI OPLS free?
RKI OPLS is free to download, with no in-app purchases.
Which has better reviews, RK Link or RKI OPLS?
RK Link and RKI OPLS are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do RK Link or RKI OPLS have ads?
Neither RK Link nor RKI OPLS shows ads.
Which is updated more often, RK Link or RKI OPLS?
RK Link ships an update every 4 months, and RKI OPLS every 2 months. Most recently, RK Link was updated on September 14, 2026 and RKI OPLS on September 25, 2026.

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