7 IB websites, compared by what they do

What each site is for, what it costs, and which ones grade your IA, EE or TOK. Every claim about another site comes from its own pages, and Marksy makes this page, so weigh it with that in mind.

Marksy against each one

What each site is for

Marksy: Marksy grades IA, EE, TOK and other IB drafts against the IB criteria. It also has oral practice, practice questions with marked answers, source checking, and free Physics and Biology textbooks with simulations.
RevisionDojo: RevisionDojo is a large IB revision platform: a questionbank, notes, textbooks, practice exams, an AI tutor called Jojo, a coursework grader, oral practice and university admissions tools.
Clastify: Clastify is best known for IB coursework exemplars with examiner comments. It also has an AI coursework grader (in beta), a questionbank, notes and flashcards, and paid reviews by IB examiners.
ChatGPT: ChatGPT is a general AI assistant. It can read an IB draft and give feedback if you paste in the criteria and explain what you want.
Revision Village: Revision Village is built around IB exam practice: a questionbank with video solutions, practice and prediction exams, key concepts, flashcards and an AI tutor called Newton AI.
Save My Exams: Save My Exams has revision notes, exam questions, flashcards and mock exams for the IB and many other exam boards, with an AI tool (Smart Mark) that marks your answers.
Kognity: Kognity makes digital IB textbooks that schools buy for their classes, with auto-marked assignments and progress data for teachers. It co-publishes several DP textbooks with the IB.

Feature by feature

The same questions for every site. Marksy's column is tinted so it is easy to find.

Feature	Marksy	RevisionDojo	Clastify	ChatGPT	Revision Village	Save My Exams	Kognity
Grading your coursework
Grades IA, EE and TOK drafts	Yes IAs, Extended Essays, TOK essays and exhibitions.	Yes IAs, Extended Essays, TOK and IOs. Unlimited on Ultra ($199 a month).	Yes An AI grader (in beta) and paid examiner reviews for IAs, EEs and TOK.	Partly Gives feedback on any draft if you paste in the criteria yourself.	No Doesn't grade coursework.	No Doesn't grade coursework.	No Doesn't grade coursework.
Mark for each criterion	Yes A mark for each criterion, comments on your own sentences and a list of what to fix first.	Yes On Pro and Ultra reports. The Mini report has comments only.	Yes Feedback on the IB criteria with a predicted mark.	Partly If you ask for them.	No Doesn't grade coursework.	No Doesn't grade coursework.	No Doesn't grade coursework.
Accuracy tested and published	Yes 92% of marks within one grade, tested on 1,317 IB-marked IAs and TOK essays.	No Says its models were trained on thousands of examiner-marked samples. No accuracy figure published.	No Says it was trained on examiner-marked exemplars. No accuracy figure published.	No Not by OpenAI. In our test, with the criteria pasted in, it scored 65/100 on our marking score. Marksy scored 74.	No Doesn't grade coursework.	No Doesn't grade coursework.	No Doesn't grade coursework.
AI check	Yes Included on paid plans.	Yes Plagiarism and AI checks on paid plans (125,000 words a month on Ultra).	No Not advertised.	No No.	No Not advertised.	No Not advertised.	No Not advertised.
Source checking	Yes Checks who made each source, when it was published, and whether you have enough variety for your assignment.	No Not advertised.	No Not advertised.	Partly Can discuss a source you paste in, but doesn't know your assignment's rules.	No Not advertised.	No Not advertised.	No Not advertised.
Grade several drafts at once	Yes Up to 15 drafts at once on Student Plus.	Unclear Has school plans, but doesn't say whether teachers can grade a class at once.	No Not advertised.	No One chat at a time.	No Doesn't grade coursework.	No Doesn't grade coursework.	Partly Teachers set auto-marked assignments to a class. Coursework isn't graded.
Review by a human examiner	No AI marking, tested against examiners' marks.	No AI grading. Tutoring is sold separately.	Yes Paid reviews by IB examiners, 10% off on Pro.	No No.	No Not advertised.	No Not advertised.	No Not advertised.
Studying for exams
Practice questions by topic	Yes Maths, Physics, Chemistry and Biology, with your written answers marked against the markscheme.	Yes A large questionbank is one of its main features.	Yes A questionbank with AI marking of answers (unlimited on Pro).	Partly Can write questions, but not from a checked IB-style bank.	Yes Its main feature: questions by topic and difficulty, with markschemes and video solutions.	Yes Exam questions by topic, with Smart Mark to mark your answers.	Yes 10,000+ questions with automatic marking, set by teachers.
Oral practice with feedback	Yes Timed, with follow-up questions and a mark. Included on paid plans.	Yes Oral practice and IO grading on paid plans.	No Not advertised.	Partly Voice chat can act out an oral if you set up the format.	No Not advertised.	No Not advertised.	No Not advertised.
Textbooks or notes	Yes Free Physics and Biology textbooks, no account needed.	Yes Notes, lessons and videos, plus full textbooks on Ultra.	Partly Notes, flashcards and coursework exemplars. No textbooks.	No Explains topics in chat. No textbooks.	Partly Key concept pages for each topic, not full textbooks.	Yes Revision notes for most IB subjects are its main feature.	Yes Interactive textbooks for most DP subjects. Its main product.
Interactive simulations	Yes About 150 inside the Physics and Biology chapters. Free.	Partly A visualisations hub. It doesn't say how many.	No Not advertised.	No No ready-made simulations.	No Not advertised.	No Not advertised.	Partly The textbooks have interactive parts. It doesn't say how many.
Price
Free plan	Yes 5 free gradings a month, no card needed.	Partly A free account with limited access.	Partly 30 credits a month. A grading costs 20, so about one a month.	Yes A free plan with limited uploads.	Partly Some topics from each course.	Yes A free account with some notes and questions.	No Bought by schools. No plan for students on their own.
Paid plans	Yes From $8.99 a month (billed yearly) for 50 gradings, 20 AI checks and 5 orals. Student Plus: 200, 50 and 20.	No $119, $139 or $199 a month, or $349 to $499 once for access until May 2027.	Yes $7.99 or $13.99 a month. Pro allows up to 150 gradings a month.	Partly Free, then paid Go, Plus and Pro plans.	Partly $70 a month for one course or $140 for all, or $249 or $499 once.	Unclear Shown when you sign up. No public IB price page.	Unclear Schools get a quote.

Based on what each tool says publicly, checked on November 8, 2026 (Marksy pricing page, RevisionDojo pricing page, RevisionDojo coursework grader page, Clastify pricing page, Clastify AI grader page, ChatGPT pricing page, Marksy grading accuracy test, Revision Village Gold pricing page, Save My Exams IB page, Kognity IB DP product page). Prices and features change, so check before you pay.

Want to check your own draft?

5 free gradings a month. No card.

Grade my draft See pricing