TL;DR
Nexa is TutorNexus's AI tutor. It is scoped strictly to CAPS Mathematics for Grades 8–12, available 24/7, and designed to supplement — not replace — live tutors. It uses a RAG (Retrieval-Augmented Generation) architecture trained on CAPS content, meaning its answers stay within the curriculum rather than going off-piste into university-level material.
Every edtech company has an AI tutor announcement right now. Most of them are generic language models with a system prompt that says “you are a helpful maths tutor.” They give correct answers to some questions and hallucinate confidently on others. They don't know what CAPS is, can't tell the difference between a Grade 9 and a Grade 12 question, and offer no mechanism for the answer to be wrong.
Nexa is built differently. It is not a general-purpose AI with a tutor persona. It is a curriculum-scoped AI tool built specifically around the content, terminology, and assessment standards of the South African Mathematics CAPS curriculum.
Here's what that means in practice.
What Nexa Is
Nexa is a Retrieval-Augmented Generation (RAG) model. In plain terms: instead of generating answers from general training data, it retrieves from a curated knowledge base of CAPS-aligned Mathematics content — then uses that retrieved content to generate its response.
The practical benefit is scope. Nexa cannot go off into advanced calculus a Grade 10 learner hasn't encountered yet. It cannot recommend a method that contradicts the CAPS marking rubric. Its answers are grounded in the curriculum, not in the full breadth of mathematical knowledge on the internet.
- Available 24/7. A learner can ask a question at 11pm the night before a test and get a coherent, curriculum-correct explanation.
- No judgement. Many learners are more willing to ask an AI a question they'd be embarrassed to ask a teacher or even a tutor. Nexa doesn't get impatient.
- Accepts uploaded images. Learners can photograph a problem from a textbook or past paper and ask Nexa to explain it.
- Credit-based usage. Free tier: 5 prompts per day. Gold plan: 30 prompts per day. Diamond plan: unlimited. Complex, multi-step problems consume more credits than simple definitions.
What Makes Nexa Different from General AI Tools
The two most common failure modes in AI-assisted maths tutoring are hallucination (generating a confident but wrong explanation) and scope drift (explaining content that isn't relevant to the learner's grade or curriculum).
CAPS-scoped knowledge base
Nexa's knowledge base is built from CAPS Mathematics content for Grades 8–12. It knows what's in scope for each grade, which topics appear in Paper 1 vs Paper 2, and how the curriculum sequences content across years.
SA terminology and notation
South African Mathematics uses specific notation conventions (e.g., the way cyclic quadrilateral proofs are structured, the precise language of Euclidean geometry statements). Generic AI tools trained on international content get these wrong often enough to be problematic. Nexa is calibrated to SA standards.
Integrated with student data
Nexa can see a learner's recent quiz performance and weaker topic areas (with the learner's permission). This allows it to contextualise explanations — if a learner is weak in quadratic equations, Nexa can connect a new concept back to that foundation proactively.
How Students Will Use It
Nexa is designed to be a between-sessions resource, not a replacement for live tutoring. The intended use pattern is:
- 1
During independent study
A learner works through a past paper and gets stuck on a specific step. They ask Nexa to explain the concept, not just give the answer. Nexa walks through the method at the relevant CAPS level.
- 2
Late-night test prep
The day before a test, a learner realises they don't understand the natural logarithm rules. Nexa provides an explanation calibrated to their grade, with worked examples from the CAPS knowledge base.
- 3
Clarifying a tutor's explanation
After a session, a learner realises they didn't fully follow one part of what the tutor explained. They ask Nexa to explain it differently — a second perspective, available immediately.
- 4
Photo analysis
A learner photographs a tricky problem from a textbook or an old exam paper. Nexa reads the image and explains the method step by step.
What Nexa Is Not
It is worth being explicit about this, because AI tutors are sometimes marketed with claims that don't survive contact with reality.
- Not a replacement for human tutors. Nexa cannot build a relationship with a learner, adapt to the learner's emotional state in real time, or provide the structured accountability that comes from a live session with a real person.
- Not a homework service. Nexa is designed to explain and teach, not to complete assignments on behalf of students. It will explain a method; it will not write the learner's portfolio submission.
- Not infallible. No AI system is. Nexa is scoped and calibrated to reduce errors, but learners should treat its explanations as one input — not as the definitive authority.
Get Early Access to Nexa
Nexa launches with the TutorNexus platform. Join the waitlist to be among the first to use it.
Join the Waitlist →Frequently Asked Questions
Which grades does Nexa cover?▾
Nexa covers CAPS Mathematics for Grades 8 through 12. It does not currently cover other subjects, though this is on the roadmap for future phases.
Can Nexa help with Pure Maths and Mathematical Literacy?▾
At launch, Nexa is scoped to CAPS Mathematics (Pure Maths). Mathematical Literacy has a different curriculum structure and will be added in a future phase.
Does Nexa give full worked solutions to exam questions?▾
Nexa can walk through a method step by step, including applying it to a given problem. It is designed to explain the method, not simply output an answer — the goal is comprehension, not answer-copying.
How do I access Nexa?▾
Nexa is available within the TutorNexus platform on the Diamond plan (unlimited), Gold plan (30 prompts/day), and free tier (5 prompts/day). It launches with the platform.