What is ChatGPT?
ChatGPT is a general-purpose AI assistant used for writing and study support across many domains, including IB tasks when configured with user prompts.
ChatGPT
ClastifyChatGPT vs Clastify
Source freshness: dated public claims, last updated .
- ChatGPT pricing page
- OpenAI ChatGPT Study Mode update
- Clastify review page
- Clastify review pricing bundle (page script)
Do you want to know wether ChatGPT or Clastify is best for IB? This page provides a through comparison of both tools.
TL;DR
Last updated:
- •TL;DR: In ChatGPT vs Clastify, Marksy is included as a third benchmark and usually wins on grading workflow depth and repeatability.
- •ChatGPT and Clastify 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 Clastify?
Clastify is an IB coursework support platform known for exemplar libraries and paid examiner-style review services for IA, EE, and TOK submissions.
Features comparison
| Feature |  ChatGPT |  Clastify | |
|---|---|---|---|
Price ?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. Subscription pricing keeps repeated retries cheaper than per-review models. | ~Partial?Free tier is available, with paid plans publicly listed around Plus ($20/month) and Pro ($200/month) plus Business/Enterprise tiers. | ~Partial?Base exemplar access can start around $12.99/month in some funnels, but grading is priced per submission: TOK $44.99, IA $49.99, EE $59.99, plus Express ($9.99) or Turbo ($19.99) add-ons. |
Price value for regular IB grading ?Lower cost per repeated grading cycle matters more than one-off pricing. | Strong?Free monthly grading entry plus clear recurring tiers is strong value for frequent IB draft loops. | ~Partial?Accessible monthly plans exist, but pricing is not specifically optimized around structured IB grading cycles. | ×No?Per-submission review pricing can become expensive for frequent weekly draft cycles. |
Publicly transparent pricing ?Lower uncertainty at evaluation time. | Strong?Public monthly pricing with free, student, and teacher tiers. | Strong?Public plan structure (Free/Plus/Pro/Business/Enterprise) is listed. | Strong?Public review pricing is visible for IA/EE/TOK review offerings. |
IB rubric-first grading workflow ?Purpose-built for criterion-level grading, not generic advice. | Strong?Criterion-first scoring and rubric-oriented grading UX. | ~Partial?Can grade with prompts, but IB rubric fidelity depends on user setup. | ~Partial?Review service provides predicted scores and improvement guidance. |
IA / EE / TOK submission support ?Designed for core IB assessed writing workflows. | Strong?Built for IA, EE, TOK submission workflows. | ~Partial?Can support all task types with prompts, not dedicated workflows. | Strong?Public review options include IA, EE, and TOK review tracks. |
Batch submission workflow ?Multiple drafts in one flow saves turnaround time. | Strong?Batch workflows support up to 15 submissions at once. | ×No?Public product is not a batch grading pipeline. | ×No?Public workflow is submission-by-submission review. |
Built-in oral / IO practice ?Keeps speaking prep and grading in one stack. | Strong?5-20 paid-tier oral/IO runs monthly. | ~Partial?Can simulate speaking practice, but no IB-structured oral workflow out of the box. | ×No?Not marketed as an oral/IO practice system. |
Past-paper grading/practice mode ?Supports exam-style practice inside the same product. | Strong?100-400 paid-tier questions monthly. | ~Partial?Possible with manual setup; no dedicated IB past-paper pipeline. | ×No?Past-paper workflow is not a public core feature. |
Built-in AI-detection checks ?Integrity checks are native, not a separate purchase. | Strong?20-50 paid-tier AI checks monthly. | ×No?No first-party academic AI-detection checker in ChatGPT product flows. | ?Unclear?No clearly advertised built-in AI-detection workflow. |
Export-ready feedback output ?Easy to keep records and track progression. | Strong?Feedback outputs can be reused and shared for iteration. | ~Partial?Outputs are copy/exportable as chat content, without structured grading reports by default. | ~Partial?Delivers detailed review output for each paid submission. |
Large questionbank / revision content ?Useful, but grading conversion usually matters more for drafts. | ~Partial?Includes past-paper practice, but not a broad standalone revision library. | ×No?No official IB questionbank library bundled by default. | ~Partial?Leans on exemplars more than broad revision questionbanks. |
Human review / exemplar-heavy model ?Helpful for examples, but can slow repeated draft loops. | ×No?Focuses on AI-assisted grading workflow over human examiner reviews. | ×No?Not an examiner review marketplace. | Strong?Core value prop: real examiner review plus exemplars. |
Teacher analytics and class-level insights ?Important for departments and school rollouts. | ~Partial?Supports workflow consistency, but not marketed as a broad textbook analytics stack. | ×No?No built-in IB class analytics dashboard for coursework. | ×No?Not publicly framed as teacher analytics software. |
Free entry path ?Students can start fast without procurement delays. | Strong?5 complete gradings monthly on free access. | Strong?Public free plan exists with paid upgrades for higher limits and models. | Strong?Public join-for-free path is available. |
Low-friction self-serve onboarding ?Individuals can get value quickly without school setup. | Strong?Students can sign up directly and start without school procurement. | Strong?Individuals can self-serve account creation and usage. | Strong?Students can self-serve and buy individual review services. |
IB-specific positioning ?Sharper product fit typically means less prompt engineering. | Strong?Positioned as an IB-specific grading workflow product. | ×No?General assistant, not IB-specific by default. | Strong?Strong IB exam/examiner framing in public messaging. |
Winner pick
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Frequently Asked Questions
What makes Marksy different from ChatGPT or Clastify?
Marksy stays purpose-built for repeatable grading workflows and is rated strong on regular-use price value (vs partial for ChatGPT and no for Clastify). Pricing: Marksy -> $0 entry with 5 full gradings/month, then paid student plans from $14.99/month. Subscription pricing keeps repeated retries cheaper than per-review models. ChatGPT -> Free tier is available, with paid plans publicly listed around Plus ($20/month) and Pro ($200/month) plus Business/Enterprise tiers. Clastify -> Base exemplar access can start around $12.99/month in some funnels, but grading is priced per submission: TOK $44.99, IA $49.99, EE $59.99, plus Express ($9.99) or Turbo ($19.99) add-ons. Against ChatGPT, Marksy leads 12 rows with key edges in Batch submission workflow and Built-in AI-detection checks. Against Clastify, Marksy leads 9 rows with key edges in Price value for regular IB grading and Batch submission workflow.
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 ChatGPT vs Clastify at 3-5, while Marksy still leads as the practical grading-first alternative.