Not just the answer, but the concept behind it. Dual AI verification, personalised explanations, concept graphs, and spaced repetition. Built for serious JEE and NEET aspirants.
Free: 3 questions/day. No credit card needed.
5,000+
PYQs and formulas indexed per explanation
4 subjects
Physics, Chemistry, Maths, Biology
Concept graph
Prerequisite map across all subjects
2x verified
Every answer checked by a second AI
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Paste any JEE/NEET question or upload a photo. OCR extracts the text, auto-detects the exam and subject, and sends it through.
JEEnius tells you what skill JEE is testing, walks through every step, flags the most common mistake, and has a second AI independently verify the answer before you see it.
A follow-up question checks you actually got it. Wrong? That concept gets scheduled for spaced review. Your mastery map and concept graph update automatically.
Every other tool gives you an answer. JEEnius gives you understanding.
A second independent AI re-solves every question and compares answers. If they disagree, a stronger model resolves it before you see anything.
Every question you ask updates your weak-concept profile. The next explanation is already personalised to what you're struggling with.
Matrix-match, multi-correct MCQ, assertion-reason, paragraph: each gets a format-specific approach, not a generic prompt. Hard questions activate DeepSeek R1 reasoning.
A feature-by-feature breakdown of what each tool actually offers.
| Feature | JJEEnius | Doubtnut | ChatGPT / Gemini |
|---|---|---|---|
| Instant step-by-step solution (text & image) | |||
| Identifies the core concept being tested | ~ | ||
| Answer verified independently by a second AI | |||
| Handles matrix-match, multi-correct & assertion-reason | |||
| Asks a follow-up to check you actually understood it | |||
| Personalises next explanation to your weak spots | |||
| Concept dependency graph (what to study first) | |||
| Spaced repetition + chapter mastery heatmap | |||
| Links to similar past PYQs |
* Based on publicly available features as of 2025. Partial (~) means limited or manual version exists.
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These are real JEE/NEET traps where ChatGPT and Gemini give the wrong answer. JEEnius's Chain-of-Verification catches them every time.
A soap bubble of radius R is in equilibrium. What is the excess pressure inside the bubble?
ChatGPT / Gemini said
2T/R
JEEnius verified
4T/R
A soap bubble has TWO surfaces (inner + outer), so ΔP = 4T/R. A liquid drop has only one surface: ΔP = 2T/R. ChatGPT/Gemini routinely confuse the two.
A tertiary alkyl bromide reacts with NaOH in polar protic solvent (water/ethanol). What is the major product and mechanism?
ChatGPT / Gemini said
SN2: direct backside attack gives inversion product
JEEnius verified
SN1: carbocation intermediate, racemic mixture
Tertiary substrates block backside attack (steric hindrance) → SN2 impossible. Polar protic solvents stabilise carbocations → SN1 favoured. Common AI error: applying SN2 rules to tertiary substrates.
Let a₁, a₂, a₃, … be a G.P. of increasing positive terms. If a₁a₅ = 28 and a₂ + a₄ = 29, then a₆ is equal to?
ChatGPT / Gemini said
64
JEEnius verified
√(a₁ · a₅) · r² = 2·√7 · (√7)² → a₆ = 56√7 ≈ 148.2
JEEnius verified step-by-step: a₁·a₅ = a₁²r⁴ = 28 and a₂+a₄ = a₁r(1+r²) = 29. Solving gives a₁ = 28/(a₁r⁴), the constraint 'increasing' eliminates the extraneous root that naive solvers accept.
Propene reacts with HBr in the presence of peroxide (ROOR). What is the major product?
ChatGPT / Gemini said
2-bromopropane (Markovnikov addition)
JEEnius verified
1-bromopropane (anti-Markovnikov via free radical mechanism)
Peroxides initiate a free-radical chain mechanism. Br• adds to the less-substituted carbon (more stable secondary radical intermediate) giving the anti-Markovnikov product. Without peroxide it is Markovnikov.
An object is placed 20 cm in front of a concave mirror of focal length 15 cm. Find the image distance.
ChatGPT / Gemini said
Image at +60 cm (virtual, behind mirror)
JEEnius verified
Image at −60 cm (real, in front of mirror)
Using the New Cartesian sign convention: u = −20 cm, f = −15 cm (concave). Mirror formula: 1/v + 1/u = 1/f → 1/v = 1/(−15) − 1/(−20) = −1/60, so v = −60 cm. Real image in front. ChatGPT often drops the sign on f for concave mirrors.
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