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To install an app on your Android OS phone or tablet, scan the QR code next to the description. You can use any barcode scanner — we like Google Goggles. For help with any of our apps, go to the wiki and search for the app.

### Fold*

Fold* is a fold and trace density app for Android, for use with onshore seismic programs. The app is a straightforward calculator, with corrections for incomplete patch coverage, and qualitative advice about optimal design from Cooper (2004, The Leading Edge).

We try to make our apps compatible with scientists still getting used to SI units :) so you can convert between meteric and Imperial on the fly. After computing the results, you can email your design to yourself or a colleague. Get it!

### Elastic*

A simple rock physics calculator for petroleum geophysicists and engineers. Elastic* takes some basic acoustic parameters and gives elastic moduli. Quickly check your intuition.

The tool is very simple. Just enter a density, at least one velocity value, and hit the Calculate button. If you only provide one velocity (Vp or Vs), and don't give a Vp:Vs ratio, the tool assumes a Vp:Vs ratio of 2.0. Conversely, if you provide velocities then anything you enter in Vp:Vs is ignored. Get it!

### AVO*

A simple amplitude vs offset modeling tool for geophysicists and seismic interpreters. The idea is to show the behaviour of amplitude with incidence angle at a single interface, based on the Aki–Richards equation and Shuey approximation, two widely-used approximations to the Zoeppritz equations.

Simply enter P-wave velocity and density for the two layers, and S-wave velocity if you have it. Then tap Curve to see the magnitude vs incidence angle curve, or Crossplot to see the AVO gradient vs intercept crossplot. Get it!

### Volume*

A handy volumetric calculator for petroleum geoscientists and engineers. Volume* takes some basic reservoir parameters and gives a total oil-in-place volume. Quickly check a figure, or do a back of the envelope estimate of your own. You can even convert between metric and Imperial.

The tool is very simple, and completely deterministic. Just enter an Area, Thickness, etc, and hit the Calculate button. Note that if you don't enter Thickness, the tool assumes that the first field is a gross rock volume. Get it!

### Risk*

A straightforward probability calculator. For now, this app is really just a helper application for Volume*, but it will grow into a handy tool for computing dependent probabilities, Bayesian updates, and other fiddly workflows.

If you have Volume*, the app is best launched from within there. You can enter probabilities directly, or choose 'words of estimative probability' from the menus. The last session is stored for recall. Get it!

### Tune*

Tune*, released at the beginning of July, is a big help to interpreters working on thin beds. Just choose a wavelet (the first version will support Ricker wavelets, but we are adding more), and optionally give a velocity for the thin layer, and the app computes the tuning curve. This tells you the thickness at which the thin layer starts to tune (i.e. its amplitude departs from the thick bed or infinite half-space response), the thickness at which it is perfectly tuned, and the amplitude increase above background at that thickness. You can also get the amplitude–thickness function. Get it!

We've started making some nifty tutorial-style videos to help you get the most out of our apps. You can explore our YouTube channel for more. If you feel like it, spread some love and rate our stuff!

Please let us know if these tools do not perform as you expected! Our apps are intended to be handy, quick-look, back-of-the-envelope' tools for everyday productivity. They are not intended for making major technical decisions with. What you do with them is entirely up to you, but the results and ramifications are your own responsibility.

Our apps are not covered by Agile's usual Creative Commons license. They are copyright of Agile Geoscience. They are provided as-is and with no warranty. You are entitled to share the compiled apps, as-is, with whomever you please. The apps will be released in the future under an open license; please contact us if you want to know more.