What is Clastify?
Clastify is known for IB example work and paid examiner-style reviews of IA, EE, and TOK submissions.
Clastify
KognityClastify vs Kognity
Source freshness: dated public claims, last updated .
Do you want to know wether Clastify or Kognity is best for IB? This page provides a through comparison of both tools.
TL;DR
Last updated:
- •TL;DR: In Clastify vs Kognity, Marksy is included as a third option and usually does best for checking several IB drafts.
- •Clastify and Kognity each have strengths, but Marksy is generally the best alternative if your priority is getting IB-ready grading output fast.
- •Free plan with 5 full gradings/month, then clear paid tiers at 50/200 gradings.
- •Grade IA, EE, and TOK drafts, practise orals, and check sources from the same account.
- •Fast feedback and optional batch uploads make it easier to check more than one draft.
What is Kognity?
Kognity provides digital IB textbooks, classroom assignments, and progress data for schools, teachers, and students.
Features comparison
| Feature |  Clastify |  Kognity | |
|---|---|---|---|
| General | |||
IB oriented ?IB-specific tools need less setup than a blank chat box. | Strong?Made specifically for grading and improving IB work. | Strong?Strong IB exam/examiner framing in public messaging. | Strong?Explicit IB DP product positioning and collaboration claims. |
Affordable ?Shows what users actually pay, including per-review and billed-total caveats. | Strong?$0 entry with 5 full gradings/month, then paid student plans from $14.99/month. | ~Partial?Base access can start around $12.99/month, with per-submission review pricing (TOK $44.99, IA $49.99, EE $59.99). | ×No?No fixed self-serve public sticker price; schools are usually quoted custom annual contracts. |
Has free tier ?Students can start immediately without procurement or upfront payment. | Strong?5 complete gradings monthly on free access. | ~Partial?Has free tier but very limited. | ~Partial?Free access trial path exists, but full use is school subscription-led. |
Transparent pricing ?Lower uncertainty at evaluation time. | Strong?Public monthly pricing with free, student, and teacher tiers. | Strong?Public review pricing is visible for IA/EE/TOK review offerings. | ?Unclear?Pricing is per-student per-year but final costs are quote-based. |
| Coursework grading | |||
IA / EE / TOK grading support ?Made for IAs, Extended Essays, TOK, and other IB coursework. | Strong?Grades IA, EE, and TOK drafts. | Strong?Public review options include IA, EE, and TOK review tracks. | ×No?Dedicated IA, EE, and TOK grading is not advertised. |
Marks by criterion ?Criterion-by-criterion marks and feedback, not generic advice. | Strong?Shows estimated marks and feedback for each assessment criterion. | Strong?Review service provides predicted scores and criterion-linked improvement guidance. | ×No?The public site does not clearly show marks by coursework section. |
AI detection ?Integrity checks are native, not a separate purchase. | Strong?20-50 paid-tier AI checks monthly. | ×No?No built-in AI-detection check is advertised. | ×No?No public AI-detection check is advertised. |
Specific tips ?A clear list shows students what to fix first. | Strong?Pairs comments with a short list of changes to make next. | ×No?Specific comments come mainly through each paid review. | ×No?No dedicated list of draft-specific fixes is advertised. |
Quick ?Fast feedback leaves time to edit and check another version. | Strong?Fast feedback leaves time to edit and check another version. | ×No?Human examiner review can take longer than instant AI-first loops. | ×No?Not positioned as a quick grading-feedback product. |
Human review ?Human review can help edge cases but usually adds time and cost. | ×No?Uses AI feedback rather than a human examiner review. | Strong?Core value prop: real examiner review plus exemplars. | ×No?Not positioned as an examiner-review marketplace. |
Good price for grading drafts ?The cost of checking several drafts matters more than one review. | Strong?Subscription pricing keeps repeated retries cheaper than per-review models. | ×No?Per-submission review pricing can become expensive for frequent weekly draft cycles. | ×No?School-led annual contracts can be heavy for individual grading-focused use. |
| Textbooks and simulations | |||
Online textbooks ?Useful for understanding a topic before working on coursework. | Strong?Includes online textbook chapters as well as draft grading. | ×No?No online textbook product is offered. | Strong?Digital IB textbook and classroom content are core pillars. |
Hundreds of simulations to learn concepts ?Interactive simulation depth improves understanding before drafting. | Strong?Public simulations hub includes hundreds of IB learning simulations. | ×No?No public simulations library is positioned. | ~Partial?Interactive learning resources exist, but a simulations count is not clearly public. |
Available for free ?Free learning content removes friction for everyday revision. | Strong?Core simulation and revision resources are publicly accessible. | ~Partial?Some resources are accessible with free accounts; detailed reviews are paid. | ×No?Trial access exists, but full textbook access is subscription-led. |
| Oral practice | |||
Practice and get feedback ?Oral practice should include structured scoring feedback. | Strong?Built-in oral practice returns feedback after each attempt. | ×No?Not marketed as an oral/IO practice system. | ×No?Not publicly positioned around oral/IO practice loops. |
Affordable oral practice ?Predictable oral-practice costs matter when students rehearse frequently. | Strong?Oral practice is included in plan limits, not charged per attempt. | ×No?No oral practice feature is advertised. | ×No?No oral practice feature is advertised. |
| Questionbank | |||
Practice IB questions ?Question practice is valuable when linked to criterion-aware feedback. | ×No?No first-party questionbank is publicly offered by Marksy. | ×No?No dedicated IB question-practice bank is provided. | Strong?Publicly advertises a 10,000+ question bank and auto-corrected assignments. |
| Teacher features | |||
Grade assessments in large batches ?Batch grading throughput matters for teacher workloads. | Strong?Bulk grading supports up to 15 submissions at once. | ×No?Reviews are bought one submission at a time. | ~Partial?Assignments are managed through a school or class account. |
Export grading results in bulk ?Exportable outputs simplify moderation and record-keeping. | Strong?Feedback outputs can be reused and shared for iteration. | ~Partial?Delivers detailed output per submission, but no public bulk export flow. | ~Partial?Teachers can manage classroom assignments and progress data. |
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Frequently Asked Questions
What makes Marksy different from Clastify or Kognity?
Marksy is made for checking several IB drafts and is rated strong for grading value, compared with no for Clastify and no for Kognity. Current public prices: Marksy — $0 entry with 5 full gradings/month, then paid student plans from $14.99/month. Clastify — Base access can start around $12.99/month, with per-submission review pricing (TOK $44.99, IA $49.99, EE $59.99). Kognity — No fixed self-serve public sticker price; schools are usually quoted custom annual contracts. Marksy leads 13 rows against Clastify, especially Specific tips and Good price for grading drafts, and 15 rows against Kognity, especially IA / EE / TOK grading support and Marks by criterion.
Can Marksy grade full coursework drafts?
Yes. Marksy accepts full coursework submissions for supported assignments and returns a predicted mark, comments, highlights, and a list of fixes.
What happens if Marksy cannot read my file?
Marksy checks whether the file and grading result can be read. If a check fails, it can retry safely instead of showing a broken report.
Can teachers grade several files at once?
Yes. The highest plan can grade up to 15 files in one batch and export the results.
What are Marksy usage limits for Free/Student/Teacher tiers?
Current monthly grading limits are 5 on Free, 50 on Student, and 200 on Student Plus. Oral practice and AI checks have their own monthly limits.
Is student data private and can users delete data?
Marksy uses account-scoped access controls and user data-management paths. From a product-fit perspective, this page's matrix also shows Clastify vs Kognity at 6-4, while Marksy still leads as the practical grading-first alternative.