Comparison

Stereonet Mobile vs DFI

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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.

About

DFI

Features
Read full description

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

Stereonet Mobile4 screens
DFI4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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

UpkeepUpdate frequency

Stereonet Mobile ships an update monthly, DFI every 8 months. The most recent releases landed on October 12, 2026 and October 24, 2026 respectively.

Scorecard1 real difference · 9 level
Stereonet Mobile versus DFI: the parameters behind the verdict, then further details
ParameterStereonet MobileDFI
PriceFreeFree
Rating4.5 (13 ratings) — better—
Positive reviews72.7% of reviews—
Number of ratings13 — better—
Update frequencyMonthly — betterEvery 8 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.0 — better15.6
Further details — not scored
Size29 MB62 MB
Age rating4+17+
DeveloperRichard AllmendingerDeep Foundations Institute, Inc.

In-app purchases

None

Stereonet Mobile

No in-app purchases

None

DFI

No in-app purchases

Questions

Is Stereonet Mobile free?
Stereonet Mobile is free to download, with no in-app purchases.
Is DFI free?
DFI is free to download, with no in-app purchases.
Do Stereonet Mobile or DFI have ads?
Neither Stereonet Mobile nor DFI shows ads.
Which is updated more often, Stereonet Mobile or DFI?
Stereonet Mobile ships an update monthly, and DFI every 8 months. Most recently, Stereonet Mobile was updated on October 12, 2026 and DFI on October 24, 2026.

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