Is Goblins free for teachers?

Yes. Goblins offers a generous free tier that includes 1 live feedback assignment per week, insights on student mastery and replays, and the ability to upload your own content. The Max plan adds unlimited assignments, superadaptive mode, grade exports, standards growth reports, and SSO/LMS integration, with per-student pricing for schools and districts.

How does Goblins work?

Three simple steps: (1) Share an assignment from thousands of standards-aligned topics using a share code. (2) Students speak and draw their thinking naturally, and Goblins responds with Socratic questioning that sounds just like their teacher. (3) Teachers get real-time formative insights showing what students struggle with and suggestions to inform instruction.

Does Goblins prevent cheating?

Yes. Goblins uses a purpose-trained AI model that evaluates cheating signals in real time. It can detect when students are copying answers, using external tools inappropriately, or not genuinely working through problems. Copy-pasting answers is also blocked.

Can I use my own voice with Goblins?

Yes. Teachers can record their voice and take a selfie to create a custom 3D avatar in about 30 seconds. Students then hear help in their own teacher's voice and see a familiar face, making the experience more personal and effective.

What math levels does Goblins cover?

Goblins covers math from Grade 5 through AP Calculus, including thousands of standards-aligned topics. Teachers can also upload their own content for custom assignments at any level.

Is Goblins FERPA compliant?

Yes. Goblins is FERPA and state compliant. Student data privacy and security are a top priority.

Does Goblins support English Language Learners?

Yes. Goblins supports 30+ languages so teachers don't have to translate every worksheet. It is especially helpful for ELL students who need accessible math instruction in their native language.

New York: GEO-G Math Standards

41 standards · 6 domains

GEOMETRY – CIRCLES

GEO-G.C.1 Prove that all circles are similar.
GEO-G.C.2a Identify, describe and apply relationships between the angles and their intercepted arcs of a circle.
GEO-G.C.2b Identify, describe and apply relationships among radii, chords, tangents, and secants of a circle.
GEO-G.C.5 Using proportionality, find one of the following given two others; the central angle, arc length, radius or area of sector.

GEOMETRY – CONGRUENCE

GEO-G.CO.1 Know precise definitions of angle, circle, perpendicular lines, parallel lines, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc as these exist within a plane.
GEO-G.CO.2 Represent transformations as geometric functions that take points in the plane as inputs and give points as outputs. Compare transformations that preserve distance and angle measure to those that do not.
GEO-G.CO.3 Given a regular or irregular polygon, describe the rotations and reflections (symmetries) that carry the polygon onto itself.
GEO-G.CO.4 Develop definitions of rotations, reflections, and translations in terms of points, angles, circles, perpendicular lines, parallel lines, and line segments.
GEO-G.CO.5 Given a geometric figure and a rotation, reflection, or translation, draw the transformed figure. Specify a sequence of transformations that will carry a given figure onto another.
GEO-G.CO.6 Use geometric descriptions of rigid motions to transform figures and to predict the effect of a given rigid motion on a given figure. Given two figures, use the definition of congruence in terms of rigid motions to decide if they are congruent.
GEO-G.CO.7 Use the definition of congruence in terms of rigid motions to show that two triangles are congruent if and only if corresponding pairs of sides and corresponding pairs of angles are congruent.
GEO-G.CO.8 Explain how the criteria for triangle congruence (ASA, SAS, SSS, AAS and HL (Hypotenuse Leg)) follow from the definition of congruence in terms of rigid motions.
GEO-G.CO.9 Prove and apply theorems about lines and angles.
GEO-G.CO.10 Prove and apply theorems about triangles.
GEO-G.CO.11 Prove and apply theorems about parallelograms.
GEO-G.CO.12 Make, justify, and apply formal geometric constructions.
GEO-G.CO.13 Make and justify the constructions for inscribing an equilateral triangle, a square and a regular hexagon in a circle.

GEOMETRY - GEOMETRIC MEASUREMENT AND DIMENSION

GEO-G.GMD.1 Provide informal arguments for the formulas for the circumference of a circle, area of a circle, volume of a cylinder, pyramid, and cone.
GEO-G.GMD.3 Use volume formulas for cylinders, pyramids, cones, and spheres to solve problems.
GEO-G.GMD.4 Identify the shapes of plane sections of three-dimensional objects, and identify three-dimensional objects generated by rotations of two-dimensional objects.

GEOMETRY - EXPRESSING GEOMETRIC PROPERTIES WITH EQUATIONS

GEO-G.GPE.1a Derive the equation of a circle of given center and radius using the Pythagorean Theorem. Find the center and radius of a circle, given the equation of the circle.
GEO-G.GPE.4 On the coordinate plane, algebraically prove geometric theorems and properties.
GEO-G.GPE.5.a Explore the proof for the relationship between slopes of parallel and perpendicular lines;
GEO-G.GPE.5.b Determine if lines are parallel, perpendicular, or neither, based on their slopes; and
GEO-G.GPE.5.c Apply properties of parallel and perpendicular lines to solve geometric problems.
GEO-G.GPE.6 Find the point on a directed line segment between two given points that partitions the segment in a given ratio.
GEO-G.GPE.7 Use coordinates to compute perimeters of polygons and areas of triangles and rectangles.

GEOMETRY - MODELING WITH GEOMETRY

GEO-G.MG.1 Use geometric shapes, their measures, and their properties to describe objects.
GEO-G.MG.2 Apply concepts of density based on area and volume of geometric figures in modeling situations.
GEO-G.MG.3 Apply geometric methods to solve design problems.

GEOMETRY - SIMILARITY, RIGHT TRIANGLES, AND TRIGONOMETRY

GEO-G.SRT.1.a Verify experimentally that dilation takes a line not passing through the center of the dilation to a parallel line, and leaves a line passing through the center unchanged.
GEO-G.SRT.1.b Verify experimentally that the dilation of a line segment is longer or shorter in the ratio given by the scale factor.
GEO-G.SRT.2 Given two figures, use the definition of similarity in terms of similarity transformations to decide if they are similar. Explain using similarity transformations that similar triangles have equality of all corresponding pairs of angles and the proportionality of all corresponding pairs of sides.
GEO-G.SRT.3 Use the properties of similarity transformations to establish the AA~, SSS~, and SAS~ criterion for two triangles to be similar.
GEO-G.SRT.4 Prove and apply similarity theorems about triangles.
GEO-G.SRT.5.a Solve problems algebraically and geometrically.
GEO-G.SRT.5.b Prove relationships in geometric figures.
GEO-G.SRT.6 Understand that by similarity, side ratios in right triangles are properties of the angles in the triangle, leading to definitions of sine, cosine and tangent ratios for acute angles.
GEO-G.SRT.7 Explain and use the relationship between the sine and cosine of complementary angles.
GEO-G.SRT.8 Use sine, cosine, tangent, the Pythagorean Theorem and properties of special right triangles to solve right triangles in applied problems.
GEO-G.SRT.9 Justify and apply the formula A=(1/2)ab sin (C) to find the area of any triangle by drawing an auxiliary line from a vertex perpendicular to the opposite side.