Comparison

FieldLogger vs CORE Calculator App

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

Head to head
About

FieldLogger

Features
Read full description

Use FieldLogger to conduct location-bound measurements in the field, store the values on your phone in csv-format, and share the measurements by mail or FTP. You can add locations by hand, or import them from a csv-file. You can choose which type of measurements can be performed at each location, before you add new measurements. At the end of the day, you can mail the locally stored locations and measurements to yourself or anybody else. The locations and measurements can also be imported into the app. FieldLogger was initially build to log measurements of groundwater head in wells, but it has grown into a tool to store measurements that are bound to a location, but vary with time. No internet connection is needed to perform the measurements (the google maps background needs an internet connection though). The app is completely free, with no ads. If you find any bugs, please contact us. If you use the app and like it, please rate it. The data is stored in two csv-files: the locations in the file locations.csv and the measurements in the file measurments.csv. The locations.csv has the following propierties: The columns are separated by ';', and the title-row has to include the following fields: NAME, SUBNAME, LAT, LON. If the user wants to use his own input-fields at each location, the field INPUTFIELD needs to be added to the header as well. For each location the input-fields are separated by '|'. At the top of the file these input-fields have to be defined by three column rows, preceeded by the header NAME;INPUTTYPE;HINT. For each location the input-fields are selected by matching the INPUTFIELD in the location list to the NAME string in the input-field list. So the locations.csv-file will look something like this: NAME;INPUTTYPE;HINT Value;number;in m. to top of tube Comment;text;make comment... NAME;SUBNAME;LAT;LON;INPUTFIELD Well1;Well1_1;53.2983;6.6653;Value|Comment Well1;Well1_2;53.2983;6.6653;Value|Comment Well2;Well2_1;53.2988;6.7286;Value|Comment The measurements.csv has the following propierties: A five-column (also seperated by ';') csv-file with the header LOCATION;DATE;TIME;VALUE;TYPE So the meassurements.csv-file will look something like this: LOCATION;DATE;TIME;VALUE;TYPE Well1_1;26-08-2014;07:56:14;5.53;Value Well1_1;26-08-2014;07:56:14;Waterlevel is high;Comment Well1_2;26-08-2014;07:57:11;The well is dry;Comment The development of this iOS app, including the additional features, was made possible by the Dutch Waterboard Peel & Maasvallei.

About

CORE Calculator App

This app provides inspectors in the oil and gas industry with essential calculations for asset integrity. It offers tools for determining Tmin, MAWP, corrosion rates, and remaining life based on industry standards.

Highlights
  • Tmin calculations
  • MAWP calculations
  • Corrosion rate calculations
  • Remaining life determination
  • Construction material information
  • Damage mechanism identification
Features
Read full description

AsInt delivers asset integrity solutions globally within the Oil and Gas Upstream, Midstream, Downstream, and Petrochemical industries. With our CORE Calculator mobile app, you have quick and easy calculator to assist API 510/570 Inspectors in calculating Tmin, MAWP, Corrosion Rates, Remaining life, etc. We use industry recognized codes and standards as the basis of all our software solutions. The app is designed to take common inspection and engineering calculations and make them available and accessible on your mobile device. Here are a few things that you can do from this mobile app: - Access comprehensive and updated information on construction materials. - Perform precise calculations based on operating details. - Identify probable damage mechanisms. - Determine remaining life based on thickness data. - Calculate corrosion rates with precision. - Seamless assessment of damage susceptibilities. and much more. Get started NOW! This CORE Calculator app is provided by AsInt, Inc. "AS IS" and AsInt takes no responsibilities or warranties of any kind concerning the safety, suitability of the calculations for your purpose, accuracy of your data, inaccuracies of user's application, or any other misuse of this application. There are inherent dangers in the use of any software, and you are solely responsible for determining the compatibility of this application with your equipment. Ensure that the industry codes and standards used as the basis of this application are applicable in your jurisdiction. We are committed to protecting and respecting your privacy. This Privacy Policy explains how we collect, use, disclose, and safeguard your information when you use our CORE Calculator mobile application. We may update our Privacy Policy from time to time. We will notify you of any changes by posting the new Privacy Policy on this page. You are advised to review this Privacy Policy periodically for any changes. Changes to this Privacy Policy are effective when they are posted on this page. By using the CORE Calculator mobile application, you agree to our terms and conditions stating Acceptance of Terms, Use of the App, Prohibited Uses, Disclaimer of Warranties, etc. For more information on Privacy Policy : https://asint.online/privacy-policy and Terms of Use : https://asint.net/mobiletermandconditions/ Contact us : info@asint.net

Screenshots

FieldLogger3 screens
CORE Calculator App4 screens

Verdict

The call

The clearest difference is in-app purchases: FieldLogger at none against CORE Calculator App's 3. FieldLogger also leads on update cadence (every 3 weeks vs every 3 months) and iOS requirement (8.0 vs 14.0). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. CORE Calculator App sells 3 in-app purchases, starting at $4.99 per month. FieldLogger asks for nothing beyond the download.

UpkeepUpdate frequency

FieldLogger ships an update every 3 weeks, CORE Calculator App every 3 months. The most recent releases landed on October 13, 2026 and October 17, 2026 respectively.

Scorecard3 real differences · 7 level
FieldLogger versus CORE Calculator App: the parameters behind the verdict, then further details
ParameterFieldLoggerCORE Calculator App
PriceFreeFree
Rating—5.0 (11 ratings) — better
Positive reviews—100.0% of reviews
Number of ratings—11 — better
Update frequencyEvery 3 weeks — betterEvery 3 months
AdsNoNo
In-app purchasesNo — betterYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS8.0 — better14.0
Further details — not scored
Size17 MB148 MB
Age rating4+4+
DeveloperArtesiaAsInt Inc.

In-app purchases

None

FieldLogger

No in-app purchases

3 purchases

CORE Calculator App

Subscriptions2
  • Materials Lookup$4.991 Month
  • Damage Mech Screener$9.991 Month
One-time1
  • Materials Lookup$5.99

Questions

Is FieldLogger free?
FieldLogger is free to download, with no in-app purchases.
Is CORE Calculator App free?
CORE Calculator App is free to download, with in-app purchases available.
Do FieldLogger or CORE Calculator App have ads?
Neither FieldLogger nor CORE Calculator App shows ads.
Which is updated more often, FieldLogger or CORE Calculator App?
FieldLogger ships an update every 3 weeks, and CORE Calculator App every 3 months. Most recently, FieldLogger was updated on October 13, 2026 and CORE Calculator App on October 17, 2026.

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