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Khan Academy
PSLE Maths practice for Singapore P1 to P6, with an otter tutor who talks your child through every mistake, step by step.

Which is more popular?
Website, pricing, platforms and company facts side by side.
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| Website | nullstack.app | studylah.com.sg |
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| Platforms | — | |
| Company | — | Startup from Singapore · 1 - 9 employees · 2026 |
| Listed in |
In their own words, as submitted to SaaSHub.


No description of Nullstack yet.
StudyLah is an online maths practice app for Singapore primary school children, P1 to P6, aligned to the latest (2026) MOE syllabus and built for the PSLE. It is made in Singapore by StudyLah Learning Pte. Ltd. Questions are written to the standard of the real PSLE and top-school exams, and every...
What each product offers, as listed by its team.


Possible disadvantages
Walkthroughs and reviews on video.
Full-stack with Nullstack - Part 3
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How often each product is chosen within a category, 0–100% relative to the other.


As answered by people managing Nullstack and StudyLah.com.sg.
StudyLah.com.sg's answer:
Children in Singapore primary schools, Primary 1 to Primary 6, and their parents, especially families preparing for the PSLE who want daily practice that teaches rather than another assessment book to mark.
StudyLah.com.sg's answer:
StudyLah Learning Pte. Ltd. is a Singapore education technology company focused on helping Primary 1 to Primary 6 students prepare for PSLE Mathematics. StudyLah is built from first-hand experience of the Singapore primary school and PSLE journey, and its questions are developed with input from Singapore tutors, including former MOE teachers.
StudyLah.com.sg's answer:
Every mistake teaches something. When a child gets a question wrong, Lah, the otter tutor, talks the solution through out loud, step by step, highlighting the exact numbers on the question as she says them and drawing the bar model or working right on it. The question then comes back later, rebuilt with new numbers and a new story, until it sticks. Mastery is tracked with a rating similar to the one used in chess, so it only rises when the child handles harder questions.
StudyLah.com.sg's answer:
It is built for one exam, the PSLE, and one syllabus, the latest (2026) MOE syllabus, from Primary 1 to Primary 6. Questions are written to the standard of the real PSLE and top-school exams, so practice feels like the real thing. Exam Mode can scope a Weighted Assessment to what the child's school has actually taught this term. Parents get a free dashboard and a weekly progress email, and the free plan is real practice every day, not a trial that runs out.
Share your experience with using Nullstack and StudyLah.com.sg. For example, how are they different and which one is better?
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