The Core Difference, at a Glance
In one line: IB is a complete two-year diploma that requires balanced study across six subject groups plus a core, while AP is a set of individual subjects you can choose freely, with no overall diploma. The table below compares them across the dimensions families care about.
| Dimension | IB Diploma | AP |
|---|---|---|
| Nature | A complete two-year diploma programme | Individual single-subject courses, freely chosen; no single diploma |
| Structure | One subject from each of 6 groups + the core (TOK, Extended Essay, CAS) | 40+ standalone subjects; students pick how many to take |
| Grading | Each subject 1–7; max 45 (42 + up to 3 from core); pass at 24 | Each exam scored 1–5 |
| Assessment | External exams + moderated internal assessment; exams in May and November | Mainly a single May exam per subject (multiple choice + free response) |
| Workload | High: all six groups plus the core, across two years | Flexible: take one subject or many |
| US universities | The vast majority of US universities accept IB results and may grant credit or advanced placement; policies vary by institution. | Most colleges grant credit or placement for scores of 3+; each sets its own policy |
| UK universities | Mapped to UCAS Tariff points; widely recognised | Recognised worldwide, but no official UK/UCAS policy; confirm school by school |
Source: International Baccalaureate (ibo.org) and College Board AP (apstudents.collegeboard.org), verified July 2026.
How Each Is Built
The IB Diploma
Students take one subject from each of six groups (studies in language and literature; language acquisition; individuals and societies; sciences; mathematics; the arts), typically with three or four at Higher Level (HL). On top sits the core: Theory of Knowledge (TOK), the Extended Essay (EE, an independent research paper of about 4,000 words), and CAS (Creativity, Activity, Service). Each subject is scored 1–7 (42 across six), the core adds up to 3 more, for a maximum of 45; the diploma is awarded from 24. Exams run in May and November.
Advanced Placement (AP)
AP is run by the College Board and offers more than 40 standalone subjects; students choose how many to take. Each course ends in its own exam (usually in May), scored 1–5, typically with a multiple-choice section and a free-response section. There is no required number of exams and no single AP diploma. Two optional add-on credentials exist, the AP Capstone Diploma and the AP International Diploma, but they are not requirements.
Which Singapore Schools Offer Each
IB, and especially the IBDP, is one of the mainstays among Singapore's international schools. UWCSEA (Dover and East campuses), Tanglin Trust, Dulwich College, and NLCS all offer the IBDP. If you are planning subject choices across these schools, our IBDP course picker maps the options step by step.
AP is offered by fewer schools here. Singapore American School (SAS) provides advanced studies including AP and the AP Capstone Diploma programme, and Stamford American International School offers AP courses to students in Grades 10 to 12.
Source: Singapore American School (sas.edu.sg) and Stamford American International School (sais.edu.sg), official academics pages, verified July 2026.
Reality check: many Singapore schools offer only IB, so the practical choice is often less about IB vs AP in the abstract and more about which curriculum the schools on your shortlist actually run.
How to Choose
There is no curriculum that is better for everyone. Match it to your child's learning style and goals.
IB tends to suit
Students who enjoy breadth, can juggle several subjects at once, are comfortable with long-form research and writing (the EE and TOK), and are aiming at universities worldwide, especially in the UK, Europe, and Commonwealth countries.
AP tends to suit
Students with clear strengths and weaknesses who want to go deep in their strong subjects, who prefer to control their course load, and whose main target is US universities.
Whichever way you lean, check what the school actually offers first: in Singapore, the IB pathway is far more common, so the option to take AP may be limited by the schools on your list.
Planning IB subject choices?
Use our IBDP course picker to map HL/SL options step by step.
Frequently Asked Questions
Which is harder, IB or AP?
It depends. IB carries a higher overall load: six subject groups plus the core, across two years, demanding time management and academic writing. Individual AP subjects can be very hard (AP Calculus BC, AP Physics C), but you choose how many to take. In short: IB is broad and heavy; AP can be as deep or as light as you make it.
Which is better for applying to US universities?
Both are widely accepted by US universities and can earn credit or placement. The vast majority of US universities accept IB results and may grant credit or advanced placement, with policies set by each institution; US colleges are also very familiar with home-grown AP. What usually matters is your scores and the whole application, not the curriculum label.
What about applying to UK universities?
IB maps cleanly onto the UK's UCAS system: total IB points convert to UCAS Tariff points, and UK universities routinely make offers on IB scores. AP has no single official UK policy; some universities accept it, but confirm school by school, and they usually want several high AP scores. For the UK, IB is the clearer path.
Can you do IB and AP at the same time?
Generally not advisable. The IB Diploma is a full two-year programme that fills the timetable, so adding AP systematically is hard. A few students self-study and sit one or two AP exams alongside IB at their own cost, but that is an extra burden, not the norm.
Does AP have a diploma?
There is no single required diploma. AP is a set of individual subjects, and students choose how many to take. College Board also offers the optional AP Capstone Diploma and AP International Diploma as add-on credentials, not requirements.
What is the maximum IB score, and the pass mark?
The maximum is 45: six subjects at up to 7 each (42) plus up to 3 from the core (TOK and the Extended Essay). The diploma is awarded from 24 points, subject to conditions such as at least 12 points at HL and 9 at SL.
What counts as a good AP score?
AP exams are scored 1–5. Most US colleges grant credit or placement for 3 and above; top universities typically want 4 or 5. Each school sets its own policy.
Which Singapore schools offer IB or AP?
IB (especially the IBDP) is a mainstay of Singapore's international schools, offered by UWCSEA, Tanglin, Dulwich, NLCS, and more. Fewer schools offer AP, mainly Singapore American School (SAS) and Stamford American International School.
Still deciding between IB and AP?
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