Fewer late-stage source surprises
You can catch unsuitable evidence before it becomes the backbone of an IA, EE, TOK essay, or portfolio.
Check your evidence
Check Your IB Sources
Check your sources before writing so weak evidence or missing viewpoints do not hurt your final work.
Checks for your subject and type of coursework.
Add URLs, citations, books, interviews, surveys, data, or TOK objects.
Answer a follow-up only when Marksy needs more information.
Better-source suggestions help you replace weak evidence before it becomes part of the draft.
Catch a weak source before you write around it
IB students often discover source problems too late: the article is too broad, the company document is biased, the TOK object is not specific enough, or the source pack repeats the same viewpoint.
Add the sources you already have and choose the assignment you are writing. Marksy tells you which sources look useful, which need more context, and which you should replace.
Lower input burden
Paste whatever identifies the source instead of completing a long form.
Better evidence before better writing
Strong writing depends on sources that can actually carry analysis.
How to check your sources
Start with what you have now. Each step shows what to do and what you will see next.
Step 1
Choose your assignment
Select the subject for the citations that you want to verify.
What you get: Get advice for the right subject and assignment, not generic citation tips.
Choose the exact IB assessment context before checking source fit.
Step 2
Add your sources
Paste an article, interview, data source, TOK object, artwork, company report, or citation.
What you get: Give Marksy enough information to check the source without filling in a long form.
Add URLs, citations, interviews, datasets, objects, or notes one source at a time.
Step 3
See what to keep or replace
Marksy fetches public pages when possible, asks for missing context only if needed, and returns a score with risks and replacement ideas.
What you get: You know which sources to keep, which need context, and which ones should be replaced before drafting.
See which sources to keep, review, or replace before writing.
Why it helps
Fewer late-stage source surprises
You can catch unsuitable evidence before it becomes the backbone of an IA, EE, TOK essay, or portfolio.
- Flags weak source types early
- Checks source-pack balance, not just single links
- Separates background reading from evidence you can analyze
Lower input burden
Paste whatever identifies the source instead of completing a long form.
- URLs, DOI/ISBN details, citations, notes, and objects all work
- Auto-detect remains the default
- Follow-ups appear only when they materially affect the verdict
Better evidence before better writing
Strong writing depends on sources that can actually carry analysis.
- Replace weak sources before drafting
- Find stronger directions for missing evidence
- Build a source set that supports the assessment question
Frequently Asked Questions
Is Source Checker only for URLs?
No. You can add URLs, citations, DOI or ISBN details, book titles, interviews, surveys, datasets, artworks, TOK objects, or source notes.
Does it officially approve my sources?
No. It gives subject-aware suitability guidance and flags likely risks, but your teacher and school instructions remain the final authority.
Why choose a source type if Auto-detect exists?
Auto-detect is quickest. Choosing a type gives Marksy more context for interviews, surveys, fieldwork, TOK objects, and arts evidence.
Ready to try it?
When the evidence is stronger at the start, the writing has less to fight against later.
Use the tool when you need it, then come back to your own work with a clear next step.