AI Overlay for Kryterion Webassessor on Mac
Kryterion administers a long list of IT and professional certifications through Webassessor (the test platform) and Sentinel Secure (the remote-proctoring app). Common Webassessor exams include AWS Certified, Salesforce certifications, and ITIL.
Sentinel Secure is a notarized macOS app that takes over the screen during the exam, streams to a live proctor, and records for asynchronous review. Its capture path is straightforward: ScreenCaptureKit on macOS 12.3+ for the screen, AVFoundation for webcam and microphone. Both APIs treat window privacy as a hard filter, not a hint. LDBypass sets the flag on its overlay; the resulting frames Kryterion receives lack the overlay region, regardless of whether the proctor is reviewing live or after the fact.
Key points
- AWS Certified Solutions Architect, Salesforce Admin, ITIL Foundation, and many ITIL/PMI exams run through Webassessor.
- Sentinel Secure is a Sentinel-specific Mac app, not a browser. It uses native APIs, which is why the privacy flag works.
- Kryterion supports both home and testing-center delivery; this guide is about the home (online proctored) path.
- A live human proctor sees the same frames the recording captures; the overlay is missing from both.
How it works
┌── macOS host ─────────────────────────────────┐ │ ┌── proctor desktop app ───────┐ │ │ │ Calls ScreenCaptureKit / │ ← misses │ │ │ CGWindowListCreateImage │ flagged │ │ └──────────────────────────────┘ windows │ │ │ │ ┌── LDBypass overlay window ───┐ │ │ │ sharingType = .none │ ← invisible │ │ └──────────────────────────────┘ to capture│ └───────────────────────────────────────────────┘
Compatibility on Mac
| macOS 14 Sonoma+ | Yes (required for window-privacy API) | ✓ |
| Apple Silicon (M1/M2/M3/M4) | Native arm64 build | ✓ |
| Intel Macs (2019+) | Universal binary supported | ✓ |
| Sentinel Secure (Mac) | macOS 12.3+ for ScreenCaptureKit | ✓ |
| Kryterion testing center | In-person, irrelevant to overlay | ✗ |
Common questions
Does Sentinel Secure run a system scan before the exam?
Yes. It enumerates running apps and may flag known proctor-bypass tools. LDBypass uses a randomized innocuous app name per build, so the scanned name is benign.
Will the overlay help me pass an AWS or Salesforce cert?
It gives you access to ChatGPT or Claude during the exam window. Whether you pass depends on your prep; using AI on a cert exam violates the candidate agreement.
Does Webassessor support second monitors?
Sentinel disables external monitors during the exam. The overlay sits on your built-in display, no extra monitor needed.