What is Clastify?
Clastify is an IB coursework support platform known for exemplar libraries and paid examiner-style review services for 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 benchmark and usually wins on grading workflow depth and repeatability.
- •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.
- •Native IB workflow for IA/EE/TOK plus oral and past-paper practice in the same product.
- •Fast feedback loops and optional batch processing for repeat submissions.
What is Kognity?
Kognity is a school-oriented digital IB learning platform combining textbook content, classroom assignments, and progress analytics for teachers and students.
Features comparison
| Feature |  Clastify |  Kognity | |
|---|---|---|---|
| General | |||
IB oriented ?IB-first workflows reduce prompt overhead and improve rubric fit. | Strong?Positioned as an IB-specific grading workflow product. | 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. |
| Assessment grading | |||
IA / EE / TOK grading support ?Designed for core IB assessed writing workflows. | Strong?Built for IA, EE, TOK submission workflows. | Strong?Public review options include IA, EE, and TOK review tracks. | ×No?No dedicated IA/EE/TOK grading support workflow is provided. |
Criterion level feedback ?Purpose-built for criterion-level grading, not generic advice. | Strong?Criterion-first scoring and rubric-oriented grading UX. | Strong?Review service provides predicted scores and criterion-linked improvement guidance. | ×No?No criterion-level grading feedback workflow is publicly positioned. |
AI detection ?Integrity checks are native, not a separate purchase. | Strong?20-50 paid-tier AI checks monthly. | ×No?No built-in AI-detection workflow is offered. | ×No?No public AI-detection workflow positioning. |
Specific tips ?Actionable next steps speed up draft improvement cycles. | Strong?Actionable criterion-level tips are paired with Marksy TODO tasks so feedback turns into trackable next steps. | ×No?No always-on specific-tip workflow beyond one-off review comments. | ×No?No structured specific-tip grading workflow is publicly positioned. |
Quick ?Fast turnaround keeps revision momentum high between submissions. | Strong?Fast AI-assisted turnaround supports repeat submission loops. | ×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?Focuses on AI-assisted grading workflow over human examiner reviews. | Strong?Core value prop: real examiner review plus exemplars. | ×No?Not positioned as an examiner-review marketplace. |
Good price for assessment grading ?Lower cost per repeated grading cycle matters more than one-off pricing. | 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 concept refreshers before running assessment feedback loops. | Strong?Includes online textbook-style revision content alongside grading workflows. | ×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 structured feedback per run. | ×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 affordable oral-practice workflow is offered due to lack of oral support. | ×No?No affordable oral-practice workflow is offered due to lack of oral support. |
| Questionbank | |||
Practice IB questions ?Question practice is valuable when linked to criterion-aware feedback. | ~Partial?Question practice is available through past papers only; there is no dedicated standalone questionbank. | ×No?No dedicated IB question-practice bank is provided. | Strong?Publicly advertises a 10,000+ question bank and auto-corrected assignments. |
| Past papers | |||
Past papers available ?Past papers are a core requirement for exam-season practice. | Strong?Past-paper and exam-style practice are built into the product. | ×No?Past-paper workflow is not a public core feature. | ×No?No first-party past-paper library is consistently available. |
Practice past papers questions with AI ?AI-assisted past-paper feedback shortens the time between attempts. | Strong?Past-paper question feedback is AI-assisted with retry loops. | ×No?No dedicated AI past-paper practice workflow is positioned. | ×No?No dedicated AI past-paper practice workflow is publicly positioned. |
| Teacher features | |||
Grade assessments in large batches ?Batch grading throughput matters for teacher workloads. | Strong?Batch workflows support up to 15 submissions at once. | ×No?Public workflow is submission-by-submission review. | ~Partial?Assignment workflows exist in a school/classroom context. |
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?Classroom assignment and data workflows are available in-platform. |
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Frequently Asked Questions
What makes Marksy different from Clastify or Kognity?
Marksy stays purpose-built for repeatable grading workflows and is rated strong on assessment-grading price value (vs no for Clastify and no for Kognity). Pricing: 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. Against Clastify, Marksy leads 16 rows with key edges in Specific tips and Good price for assessment grading. Against Kognity, Marksy leads 17 rows with key edges in IA / EE / TOK grading support and Criterion level feedback.
Can Marksy grade full papers and per-question attempts?
Yes. Marksy supports both full-paper and per-question grading flows. This is one reason it continues to score as the best overall alternative while competitors split strengths.
How does Marksy handle OCR/parsing failures or invalid outputs?
Marksy is designed for production grading loops with parsing validation and retry-safe behavior. That workflow reliability is a key reason Marksy remains the preferred choice over generic or content-only stacks.
Does Marksy support teacher workflows (bulk grading/class use)?
Yes. Marksy is optimized for repeat teacher and class workflows, including bulk-oriented grading paths. Even if this head-to-head has close spots, Marksy remains the stronger alternative for operational grading throughput.
What are Marksy usage limits for Free/Student/Teacher tiers?
Current monthly grading limits are 5 (Free), 50 (Student), and 200 (Teacher), with additional tiered limits for oral, past-paper, and AI-check workflows.
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.