Math, science & code

¾ is 0.75.
H₂O is H2O.
Every time.

Answers are compared as what they mean, not how they were typed or written. No student loses a mark for notation — and no student gains one by getting the case of a chemical symbol wrong.

Mathematics

Numbers are compared as values — every spelling of the same quantity matches.

3/4 · 0.75 · 1/3 = 2/6the same value

x ≤ 5 · x <= 5 · x =< 5x ≤ 5

2π · 2 pi · √16 · sqrt(16)evaluated: 6.283… and 4

50% · $5 · €5the number — %, $, € are presentation

9.8 ± 0.2 on the key9.6 to 10.0 is correct

Physics & units

Unit spellings fold together; the value and the unit both have to be right.

9.8 m/s² · 9.8 m/s^2value and unit both checked

N·m · N m · Nmnewton-metres

µm · um · Ω · ohmmicrometres, ohms

m² · m^2 · m2square metres

mL vs mltwo different units — kept apart

Chemistry

Subscripts, charges and arrows are one spelling each — but element case is meaning.

H₂O · H2OH2O

SO₄²⁻ · SO4^2-sulfate, charge included

2H2+O2->2H2O · 2 H₂ + O₂ → 2 H₂Othe same equation

CO vs Cocarbon monoxide vs cobalt — kept apart

Code & computer science

Whitespace is noise; operators and identifier case are the answer and stay exact.

O(n²) · O(n^2)O(n^2)

x<=5 · x <= 5x <= 5 — and < stays different

myVar vs myvartwo different identifiers — kept apart

Source files, 30 languages · Jupyterrendered with line numbers and cell outputs

Biology

Genotype case is the whole answer, so it is preserved — only the ordering is forgiven.

AaBb · BbAaAaBb

AA vs Aa vs aathree different answers

Music

Accidentals and solfège in either language land on the same note.

F♯ · F# · F sharp · Fa sostenidoF♯

C♯ vs D♭kept distinct — naming the note is the answer

How it works

Rules, not opinions.

The AI reads the handwriting. Then a deterministic engine normalises both answers and compares them — so the same paper gets the same score every time, and you can see exactly why.

1Read what the student wrote
2Normalise notation on both sides
3Compare values, units and case — by rule
4Not sure? Flag it for you

Missing a symbol your subject uses?

Tell us how it's written and how it's read, from inside the app. Requests go straight to the people who build the rules.

Open the app

¾ is 0.75.H₂O is H2O.Every time.