AI reasoning tutor · Algebra
It doesn't correct your answer.
It corrects your reasoning.
When you get an exercise wrong, apps just say «incorrect». Diagnos tells you why you thought that way, at which exact step, and guides you with questions until you find the error yourself.
Works with pencil, paper and a photo. Built for real classrooms.
Live diagnosis
notebook · p. 123x + 5 = 20
3x = 20 + 5
3x = 25
x = 25/3
Misconception · SIG-01
When you moved the 5 to the other side, you assumed it keeps its sign. What did you do to the left that you didn't do to the right?
The problem
«Incorrect, the answer was 5» teaches nothing.
Behind every repeated mistake there is a misconception: a false rule the student believes to be true. A teacher with thirty-five students cannot diagnose it notebook by notebook. Diagnos can — without robbing the student of the joy of discovering it.
The method
Four steps, zero answers given away
Show your work
A photo of your notebook is enough. Diagnos reads your handwriting and reconstructs every step exactly as you thought it.
Find the broken step
It doesn't check your final answer: it walks through your reasoning and pinpoints where the logic broke.
Name your misconception
It classifies the error against a real pedagogical catalogue. It's not a mistyped symbol: it's an idea that needs fixing.
Guide you until you see it
It never gives you the solution. A dialogue of questions leads you to state your own error, and then you practise against it.
Pedagogical rigour
A real catalogue of misconceptions, not made-up labels
Every diagnosis is classified against a taxonomy of algebraic errors documented in educational research. That makes it possible to measure, compare and — above all — re-teach with precision.
SIG-01
Transposing without changing the sign
SIG-02
Incomplete distribution of the negative sign
OPS-01
Reversed order of operations
OPS-02
Illusion of linearity
VAR-01
Concatenation read as addition
VAR-02
Combining unlike terms
For teachers
Your classroom's heat map, notebook by notebook
Every anonymous diagnosis feeds a dashboard showing which misconceptions dominate your class this week. Stop guessing what to re-teach on Monday: look at it.
See the teacher dashboardDemo class · this week
SIG-01 · Transposing without changing the sign
78%
SIG-02 · Incomplete distribution of the negative sign
52%
EQU-01 · Operating on one side only
34%
FRA-01 · Improper cancellation in fractions
21%