Comparison

StraboTools vs Slope Calculator Plus

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

Head to head
About

StraboTools

This app assists geologists in the field by analyzing photographs to provide quantitative data on rock fabric and mineral composition. It offers tools for measuring fabric orientation, determining color index, and detecting edges in rock images.

Highlights
  • Edge Fabric tool for orientation analysis
  • Color Index tool for mineral composition
  • Edge detection filter
  • Analyzes photos in-app or imported
  • Useful for plutonic and other rock types
  • Supports thin section study
Features
Read full description

StraboTools is designed to aid geologic field work by providing quantitative data that are otherwise difficult to estimate in the field. The app was developed for work in plutonic rocks such as granite, but it can be useful in field work in any type of rock and for study of thin sections as well. The app analyzes a photograph taken within the app or imported into it. •The Edge Fabric tool plots an ellipse that summarizes the orientations of image brightness gradients. In rocks with a fabric produced by deformation, this ellipse provides the orientation of the fabric and an axial ratio, which correlates with bulk deformation. The tool also reports the orientation in space of the line defined by the long axis of the ellipse. If, for example, the fabric being measured is planar, then these intersection lineations will lie on a great circle. Edge fabric diagrams are useful both in the field and for analysis of photomicrographs. •The Color Index tool allows quantitative determination of the color index (CI; area percent dark minerals) from a photograph. The user takes a photograph and then moves a slider to highlight those pixels darker than a certain threshold. The resulting area percent is displayed. Both adaptive and full-image thresholding are available. •Edge Detect applies an edge detection filter to the image. This can be useful in highlighting subtle features in an outcrop and in interpreting edge fabric ellipses.

About

Slope Calculator Plus

Features
Read full description

Slope Calculator – Graph Lines From Two Points Slope Calculator is a powerful and easy-to-use math tool that helps you quickly calculate the slope and equation of a straight line from two points. Simply drag two points on the graph and the app instantly shows the slope, line equation, distance, midpoint, and angles. Perfect for students, teachers, and anyone studying algebra or coordinate geometry. Interactive Graph Canvas Visualize math like never before. Drag two points directly on the coordinate grid and watch the line update in real time. The calculator instantly computes important values so you can understand how the line changes. Key Features • Interactive coordinate graph • Drag two points to form a line • Automatic slope calculation (m) • Find the line equation (y = mx + b) • Calculate distance between two points • Find the midpoint instantly • View angles with the x-axis and y-axis • Real-time graph updates • Clean and simple interface Learn Coordinate Geometry Faster Slope Calculator helps students understand how lines behave on a graph. The app automatically calculates: • Slope (m) • Line equation • Distance between two points • Midpoint coordinates • Angle of the line This makes it a great tool for homework, studying, or teaching math concepts. Perfect For • High school math students • Algebra and geometry classes • Teachers explaining slope and lines • Anyone learning coordinate geometry Simple and Accurate Just move the points on the graph and see results instantly. No complicated inputs or formulas required. Whether you're solving homework problems or exploring how graphs work, Slope Calculator makes math visual and easy. Slope, sometimes referred to as gradient in mathematics, is a number that measures the steepness and direction of a line, or a section of a line connecting two points, and is usually denoted by m. Generally, a line's steepness is measured by the absolute value of its slope, m. The larger the value is, the steeper the line. Given m, it is possible to determine the direction of the line that m describes based on its sign and value: • A line is increasing and goes upwards from left to right when m is greater than 0 • A line is decreasing and goes downwards from left to right when m is less than 0 • A line has a constant slope and is horizontal when m = 0 • A vertical line has an undefined slope, since it would result in a fraction with 0 as the denominator. The slope is represented mathematically as: m = (y₂ - y₁) / (x₂ - x₁) Referring to the Pythagorean theorem, we can calculate the distance provided in the calculator: d = √((x₂ - x₁)² + (y₂ - y₁)²) Given the slope (m), it is possible to find the angle ° using the following equation: Angle ° = tan⁻¹(m) Thanks for your support, and do visit nitrio.com for more apps for your iOS devices.

Screenshots

StraboTools4 screens
Slope Calculator Plus4 screens

Verdict

The call

The clearest difference is price: StraboTools at Free against Slope Calculator Plus's $2.99. StraboTools also leads on update cadence (every 2 months vs every 23 months) and iOS requirement (12.0 vs 17.0). On 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

StraboTools is free to download; Slope Calculator Plus costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

StraboTools ships an update every 2 months, Slope Calculator Plus every 23 months. The most recent releases landed on June 4, 2026 and September 23, 2026 respectively.

Scorecard3 real differences · 7 level
StraboTools versus Slope Calculator Plus: the parameters behind the verdict, then further details
ParameterStraboToolsSlope Calculator Plus
PriceFree — better$2.99
Rating5.0 (10 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings10 — better—
Update frequencyEvery 2 months — betterEvery 23 months
AdsNoNo
In-app purchasesNoNo
MonetizationFree—
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS12.0 — better17.0
Further details — not scored
Size14 MB1 MB
Age rating4+9+
DeveloperThe University of KansasHeng Jia Liang

In-app purchases

None

StraboTools

No in-app purchases

None

Slope Calculator Plus

No in-app purchases

Questions

Is StraboTools free?
StraboTools is free to download, with no in-app purchases.
Is Slope Calculator Plus free?
Slope Calculator Plus costs $2.99, with no in-app purchases.
Do StraboTools or Slope Calculator Plus have ads?
Neither StraboTools nor Slope Calculator Plus shows ads.
Which is updated more often, StraboTools or Slope Calculator Plus?
StraboTools ships an update every 2 months, and Slope Calculator Plus every 23 months. Most recently, StraboTools was updated on June 4, 2026 and Slope Calculator Plus on September 23, 2026.

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