Stereonet Mobile vs DFI
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Stereonet Mobile
This app assists geologists in collecting, visualizing, and analyzing geological orientation data. It offers automatic data entry using device sensors and augmented reality, manual input options, and various plotting and calculation tools for geological features.
- Automatic data entry via device orientation
- Augmented reality for strike and dip measurement
- Manual data entry via stereonet or text fields
- Plotting of lines and planes with user-defined types
- Basic geological calculations (rotations, angles, slope stability)
- Plotting of mean vectors, rose diagrams, and contour lines
- View plots from any orientation
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Stereonet Mobile is designed to help you collect, visualize, and analyze geological orientation data. It is a companion to my Stereonet program for desktop computers. As such I have tried to incorporate the basic functionality of that program, taking into account the inherent limitations of mobile devices. Some of the basic tasks that one can perform with Stereonet Mobile include: • Provide automatic data entry as a geologist's compass by reading the iOS device orientation and converting it to strike and dip of planes and/or trend and plunge of lines. It is the only geology compass app that can use augmented reality to record the strike and dip of planes using the sighting method and the device camera. • Provide manual data entry via either tapping and dragging on the stereonet or by typing values into text fields • Plot lines and planes, which can be tagged using one of as many user defined data types (e.g., bedding, cleavage, slickensides, etc.) as you want • Carry out basic calculations such as: rotations about any axis, planes from poles or poles from planes, measure angles between lines and between planes, and basic slope stability calculations • Plot mean vectors, cylindrical best fits, rose diagrams, and contour lines. • View the plots from any orientation, not just looking straight down into the lower hemisphere • See the location of a datum on a map or satellite image (if you have an internet connection) • Show realtime changes to the stereonet projection to help students understand the geometry of the device better • Provide basic input and output of data using standard iOS conventions • Works on iPhones or iPads. The program will work on iPods or iPads lacking a cellular data connection but those devices have fewer sensors and thus cannot be used in automatic data collection mode.
DFI
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An international association of contractors, engineers, manufacturers, suppliers, academics and owners in the deep foundations industry. Our multidisciplinary membership creates a consensus voice and a common vision for continual improvement in the planning, design and construction of deep foundations and excavation. This container app is a home to all our corporate events and is meant to showcase the same throughout its lifespan.
Screenshots
Verdict
The clearest difference is update cadence: Stereonet Mobile at monthly against DFI's every 8 months. On price, ads, in-app purchases 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Stereonet Mobile ships an update monthly, DFI every 8 months. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.
| Parameter | Stereonet Mobile | DFI |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (13 ratings) — better | — |
| Positive reviews | 72.7% of reviews | — |
| Number of ratings | 13 — better | — |
| Update frequency | Monthly — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.0 — better | 15.6 |
| Further details — not scored | ||
| Size | 29 MB | 62 MB |
| Age rating | 4+ | 17+ |
| Developer | Richard Allmendinger | Deep Foundations Institute, Inc. |
In-app purchases
Stereonet Mobile
No in-app purchases
DFI
No in-app purchases









