IB Biology IA Grader — Free AI Feedback on Lab Reports

IBLens grades your IB Biology Internal Assessment against the official IB Biology IA rubric — criterion by criterion — and gives you a predicted score in 60 seconds. Paste your lab report, get specific, actionable feedback on every criterion. A free preview is included; the full report is $4.99.

IB Biology IA rubric: what examiners look for (24 marks)

The Biology IA is worth 20% of your final IB grade. Under the current (first assessment 2025) scientific investigation, examiners assess four criteria worth 6 marks each, and the same rubric applies at SL and HL. The report has a maximum of 3,000 words.

• Research design — 6 marks: Research question within a broader context, methodology, variables and controls, and safety, ethical and environmental considerations. IBLens checks whether your research question is focused, your variables are correctly identified, and your method is reproducible.
• Data analysis — 6 marks: Recording, processing and presenting data, including the treatment of uncertainties, in ways relevant to the research question. IBLens checks for correct uncertainty analysis, appropriate statistical tests, and whether your data presentation supports your research question.
• Conclusion — 6 marks: A conclusion justified by your analysis, answering the research question and compared with the accepted scientific context. IBLens checks whether your conclusion follows from your data and is interpreted against the wider scientific literature.
• Evaluation — 6 marks: Evaluation of methodological weaknesses and limitations, with realistic, specific improvements. IBLens checks whether your improvements are specific and realistic rather than generic.

Common IB Biology IA mistakes IBLens catches

• Missing uncertainty analysis: Not including absolute or percentage uncertainties in data tables, or failing to propagate uncertainties through calculations. This alone can drop your Data analysis score from 6 to 3.
• Unfocused research question: A broad or descriptive question with no methodological rationale weakens Research design — examiners want a specific question set in a clear scientific context, with justified variables and controls.
• Weak evaluation section: Listing limitations without analysing their impact on your results, or proposing impractical improvements like "use better equipment".
• Conclusion not linked to the science: Stating a result without comparing it to accepted scientific context or literature values loses marks on the Conclusion criterion.
• Insufficient statistical processing: Not using t-tests or chi-squared tests when the data type requires them.

Frequently asked questions

Is the Biology IA grader free?

Every essay gets a free preview (band range, weakest criterion with full feedback, top risks). The full report — exact score and every criterion with comments — unlocks for $4.99, or $19.99 for a pack of five.

How accurate is the predicted score?

IBLens uses the official IB Biology IA rubric descriptors and examiner language. The predicted score is a close approximation. Your teacher's assessment is the official one.

Can I use this for Biology EE?

No — the Biology IA grader uses the IA-specific rubric. For Extended Essays, use the Extended Essay grader. For IB Biology EE tips, see our Biology EE guide.

Does IBLens store my essay?

Anonymous analyses are not permanently stored. Signed-in users can access analysis history from their dashboard.