Marksyvs
Clastify
What Marksy does that Clastify does, what it adds, and where Clastify is still the better pick.
Based on what each tool says publicly, checked on (Clastify pricing page, Clastify AI grader page, Marksy pricing page). Prices and features change, so check before you pay.
Which should you choose?
Clastify started as a library of example coursework and added an AI grader. Marksy is built around grading your own draft, with its accuracy published, and adds what Clastify doesn't have: an AI check, oral practice, source checking, and textbooks with simulations.
Choose
Clastifyif
- you want to read real IAs and EEs with examiner comments
- you want a human IB examiner to review your final draft
Choose
Marksyif
- you want a grader whose accuracy has been tested and published
- you want 5 free gradings a month instead of about one
- you want an AI check, oral practice and source checking in the same account
How the grading compares
Clastify's AI grader is in beta. It says it was trained on examiner-marked exemplars, and it suggests a paid examiner review if you want a final-grade prediction. It doesn't publish an accuracy figure.
Marksy publishes its numbers, tested on essays the IB had already marked. Every figure, and how we tested, is on the grading accuracy page.
On the free plans, Clastify gives about one grading a month and Marksy gives 5. Paid, Clastify Pro is $13.99 a month for up to 150 gradings (at most 5 a day). Marksy Student is from $8.99 a month (billed yearly) for 50 gradings, with oral practice and an AI check included.
92%
of Marksy's marks land within one grade of the IB's final mark
Tested on 1,317 IAs and TOK essays the IB had already marked. See how we tested
Feature by feature
| Feature |  Clastify | |
|---|---|---|
| Grading your coursework | ||
| Grades IA, EE and TOK drafts | Yes IAs, Extended Essays, TOK essays and exhibitions. | Yes An AI grader (in beta) and paid examiner reviews for IAs, EEs and TOK. |
| Mark for each criterion | Yes A mark for each criterion, comments on your own sentences and a list of what to fix first. | Yes Feedback on the IB criteria with a predicted mark. |
| Accuracy tested and published | Yes 92% of marks within one grade, tested on 1,317 IB-marked IAs and TOK essays. | No Says it was trained on examiner-marked exemplars. No accuracy figure published. |
| AI check | Yes Included on paid plans. | 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. |
| Grade several drafts at once | Yes Up to 15 drafts at once on Student Plus. | No Not advertised. |
| Review by a human examiner | No AI marking, tested against examiners' marks. | Yes Paid reviews by IB examiners, 10% off on Pro. |
| Studying for exams | ||
| Practice questions by topic | Yes Maths, Physics, Chemistry and Biology, with your written answers marked against the markscheme. | Yes A questionbank with AI marking of answers (unlimited on Pro). |
| Oral practice with feedback | Yes Timed, with follow-up questions and a mark. Included on paid plans. | No Not advertised. |
| Textbooks or notes | Yes Free Physics and Biology textbooks, no account needed. | Partly Notes, flashcards and coursework exemplars. No textbooks. |
| Interactive simulations | Yes About 150 inside the Physics and Biology chapters. Free. | No Not advertised. |
| Price | ||
| Free plan | Yes 5 free gradings a month, no card needed. | Partly 30 credits a month. A grading costs 20, so about one a month. |
| 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. | Yes $7.99 or $13.99 a month. Pro allows up to 150 gradings a month. |
Want to check your own draft?
5 free gradings a month. No card.