QRTaro vs Gas
Price, ratings, monetisation and update history for both apps, side by side ā with what reviewers say about each.
QRTaro
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QRTaro is an application that can read QR code and create QR code. Easy operation! Read history will also remain. ā QRMaker: Create a QR code from the input text. The created QR code can be saved as an image in a photo album. Also, the created QR code can be sent directly to an application such as a message, mail, memo, Twitter, LINE, Gmail, etc. ā QRReader: Read the QR code from the camera and photo album images. Since pinch-in pinch-out and tap focus function are carried, focus adjustment can be done easily. By tapping the folder icon displayed at the bottom of the top screen, the photo album is displayed and you can also select the previously saved QR code image for reading. You can also pass the scanned data directly to the application such as message, mail, memo, Twitter, LINE, Gmail from the reading result screen. Also, since the scanned data of the QR code is displayed as a scan history by date on the history list screen, you can tap the scanned data and obtain the reading result again. Since historical data has selective batch delete and delete all functions, it is also possible for users to organize them. ā» Up to 30 history lists are displayed. If it exceeds 30, the history data of the oldest date is deleted. ā Note: Ads will be hidden if you pay.
Gas
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The application allows the user to solve most of gas transportation problems, calculate the process of transporting natural gas (steam phase of LNG, LPG, associated petroleum gas, biogas) through a single-line pipeline. The graphical representation allows to instantly find the optimal solution and determine the influence of various factors on the gas transportation process. The application can help the user to get a calculation result that is sufficient for making an estimated engineering decision. Scope of application ⢠Distribution and internal gas supply systems ⢠Main-gas transport ⢠Gas distribution and gas collection networks Key Features Using the application can be calculated: ⢠gas flow rate in the pipeline for a given pressure drop and geometric characteristics of the pipeline ⢠pressure drop in the gas pipeline (final or initial pressure) for a given flow rate and pressure drop ⢠the length of the gas pipeline that provides a specified gas flow rate for a given pressure drop and diameter of the gas pipeline ⢠the required diameter of the gas pipeline, which provides a specified gas flow rate for a given pressure drop and length of the gas pipeline ⢠the blowdown time for stopped section of gas pipeline ⢠the required power of the gas compressor, which provides the necessary degree of pressure increase for a specified natural gas flow rate. The compression process is adiabatic. The calculation can be performed for a single-or multi-stage compressor. The application uses: General Fundamental Isothermal Flow Equation (the basic equation of gas flow), American Gas Association Equation (AGA NB-13 method), Weymouth Isothermal Flow Equation, Panhandle A Isothermal Flow Equation. Panhandle B Isothermal Flow Equation, Institute of Gas Technology Isothermal Flow Equation. The user can choose one of them. The properties of the transported gas are determined on base of its composition. The user can select the gas composition from the previously entered ones, edit, add a new one, or delete the previously entered gas composition. The user can also select the pipe wall material and, accordingly, the absolute roughness value from the previously entered ones, edit, add a new value, or delete the previously entered material name and roughness value. For the convenience of calculations, the application provides a wide range of applicable units of measurement, as well as standard conditions for measuring gas flow. The accuracy of the calculation methods used in the application corresponds to or exceeds the accuracy of the methods for obtaining initial data available in engineering practice. The data entered by the user is saved and transferred between the calculation forms, which allows the user to quickly consider the problem of calculating the parameters of the gas pipeline from all sides. The results can be saved as a pdf file, as well as printed out. Terms of use: https://www.gas-main.info/#terms-of-use Privacy Policy: https://www.gas-main.info/#privacy-policy
Screenshots
Verdict
The clearest difference is ads: Gas at none against QRTaro's shown. Gas also leads on device support (3 vs 1) and iOS requirement (13.4 vs 17.0). QRTaro's advantage is update cadence (monthly vs every 6 months). On price and in-app purchases there is nothing between them.
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
Both are free to download. QRTaro sells 1 one-off in-app purchase and Gas sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
QRTaro ships an update monthly, Gas every 6 months. The most recent releases landed on October 12, 2026 and October 14, 2026 respectively.
| Parameter | QRTaro | Gas |
|---|---|---|
| Price | Free | Free |
| Update frequency | Monthly ā better | Every 6 months |
| Ads | Yes | No ā better |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad, iPod ā better |
| Requires iOS | 17.0 | 13.4 ā better |
| Further details ā not scored | ||
| Size | 22 MB | 10 MB |
| Age rating | 4+ | 4+ |
| Developer | Masashi Sasaoka | Iurii Dubrov |
In-app purchases
QRTaro
- Ad-free$1.99
Gas
- Get full App version$7.99









