Comparison

optrel vs DLLHS

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

Head to head
About

optrel

Features
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Optrel - your connection to swiss air respiratory systems With the Optrel app, you can transform your mobile device into a powerful control and monitoring tool for your swiss air respiratory system. Thanks to modern Bluetooth Low Energy (BLE) technology, the app provides you with a seamless connection and gives you comprehensive control and insight into the status of your swiss air. Main functions AIR FLOW CONTROL: Adjust the air flow of your swiss air respirator directly via the app to ensure optimum breathing conditions at all times. Whether you need a lower or higher air supply, the adjustment is simple and intuitive. BATTERY CHARGE & FILTER STATUS: Check the current battery charge level and filter status of your swiss air device at a glance. This important information helps you to ensure that your appliance is ready for use and to carry out any necessary maintenance in good time. BLOWER RUNTIME: Read out the total running time of the fan to get an overview of the operating time. This function is particularly useful for maintenance planning and tracking usage history. SENSOR VALUES: The app allows you to read out the temperature and pressure sensor values of the swiss air control unit. This data provides you with valuable insights into the ambient conditions and helps you maximize the safety and efficiency of your respirator. FIRMWARE UPDATES: With the Optrel app, you can carry out firmware updates for your swiss air device quickly and easily. Always stay up to date with the latest technology and benefit from the latest functions and improvements. USER EXPERIENCE: The Optrel app has been developed with a focus on user experience and intuitive operation. Thanks to the clear and concise user interface, you can use all functions effortlessly, whether you are an experienced professional or a new user. SAFETY & RELIABILITY: Your safety is our top priority. The Optrel app provides you with reliable and accurate information about your swiss air so that you can rely on your equipment in any situation. REGULAR UPDATES: We are constantly working to improve the Optrel app and provide regular updates to add new features and optimise performance. Your feedback is very important to us as we strive to provide the best possible user experience. COMPATIBILITY: The Optrel app is compatible with all iOS devices (from iOS 11.0), except tablets that support BLE, and has been specially developed for seamless integration with Swiss air respirators. Download the Optrel app today and experience the next generation of respirator control. SUPPORT: If you have any questions or need support, our customer support team will be happy to help. Visit our website or contact us directly via the app. swiss air โ€“ safety never felt so comfortable. Download the app now and benefit from the versatile control and monitoring functions offered by the Optrel app. Connect to your swiss air and optimise your safety and performance in the field.

About

DLLHS

Features
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This app allows you to connect to the ABT8000 datalogging height and stagger device. You will be able to take measurements using the app and save them in a .xls file. Measurements include: height and stager of electrification wire, track gauge and cant, REFOS measurements, and others.

Screenshots

optrel4 screens
DLLHS4 screens

Verdict

The call

The clearest difference is update cadence: DLLHS at every 2 months against optrel's every 6 months. optrel's advantage is iOS requirement (12.2 vs 16.1). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice ยท In-app purchases ยท Ads ยท Monetization

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

UpkeepUpdate frequency

optrel ships an update every 6 months, DLLHS every 2 months. The most recent releases landed on June 11, 2026 and September 12, 2026 respectively.

Scorecard2 real differences ยท 4 level
optrel versus DLLHS: the parameters behind the verdict, then further details
ParameteroptrelDLLHS
PriceFreeFree
Update frequencyEvery 6 monthsEvery 2 months โ€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPodiPhone, iPad
Requires iOS12.2 โ€” better16.1
Further details โ€” not scored
Size207 MB103 MB
Age rating4+4+
Developeroptrel tec agAbtus Ltd

In-app purchases

None

optrel

No in-app purchases

None

DLLHS

No in-app purchases

Questions

Is optrel free?
optrel is free to download, with no in-app purchases.
Is DLLHS free?
DLLHS is free to download, with no in-app purchases.
Do optrel or DLLHS have ads?
Neither optrel nor DLLHS shows ads.
Which is updated more often, optrel or DLLHS?
optrel ships an update every 6 months, and DLLHS every 2 months. Most recently, optrel was updated on June 11, 2026 and DLLHS on September 12, 2026.

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