Observed arrival · 2026-09-29
Redpen turns exam mistakes into marked repairs
An exam-practice product that says it marks written answers, code, and photo-submitted diagrams against exam-specific rules.
○Open
⊠Login
$Paid
†Ads
✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Students preparing for specific computing exams
- Worth noticing
- The homepage labels Cambridge 9618 as live, 0478 as next, and AP CS A as coming.
Field notes
The homepage’s sample packet-switching response earns 2/3: “faster” is rejected, and the repair explains the missing consequence about rerouting around congestion or failure. A separate pseudocode example marks initialization and checking all five vowels as missed criteria. Redpen says it generates fresh questions and adapts topic selection to demonstrated knowledge; the exam-specific availability labels distinguish a live course from announced or upcoming ones.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
⊠LoginAccess appeared gated
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
ƒJavaScriptBrowser-side code central
One card from the complete issue