System design interviews,
structured and confident
Real-time AI that helps you structure your thinking. Get architecture frameworks, trade-off analysis, and follow-up prompts as you work through complex design problems.
macOS and Windows. 15-minute free trial, no credit card required.
Think Deeper Mode
Perfect for system designWhen the question is complex, Dusky thinks harder. Extended AI reasoning for architecture decisions, trade-offs, and multi-step problems.
Example: "Design a distributed cache system"
Think Deeper output:
- 1. Clarifying questions: Read vs write ratio? Consistency requirements? Data size estimates?
- 2. High-level design: Client → Load balancer → Cache nodes (consistent hashing) → Storage layer
- 3. Key trade-offs: Cache eviction (LRU vs LFU), replication (sync vs async), partition strategy
- 4. Failure modes: Cache stampede, hot keys, network partitions, node failures
- 5. Scaling considerations: Sharding strategy, capacity planning, monitoring metrics
Covers all major system design topics
Dusky helps you structure answers for any system design question you'll encounter.
Zoom
Meet
Teams
+more
Simple pricing
Pay for what you need
No subscriptions to forget. Pick the plan that matches your timeline.
Weekly Pass
Best for 1-2 interviews
- 7 days unlimited use
- Think Deeper mode
Job Hunt Pass
Best for active interviewing
- 8 weeks unlimited use
- Think Deeper mode
- Best value per week
Pro
Best for consultants
- Unlimited monthly use
- Think Deeper mode
- Cancel anytime
About "unlimited": there is no per-session or per-interview limit, but each plan has a fair-use cap — roughly 10 hours a week on Weekly, 50 hours across the 8 weeks on Job Hunt, and 25 hours a month on Pro. Past the cap you keep working, but Thorough responses fall back to Fast.
All plans include macOS and Windows apps. Prices in USD.
See full plan details →FAQ
Common questions
Will interviewers see Dusky during screen share?
Dusky asks the operating system to exclude its window from screen capture, so it stays out of screen shares and recordings on Zoom, Meet, and Teams. It is one OS-level flag and capture methods differ, so test it on your own setup before a real interview.
Where is my data stored?
Audio is streamed for transcription and discarded immediately. Transcripts and AI responses stay on your device only. We never store your interview content on our servers.
What permissions does Dusky need?
Microphone, to transcribe your own voice. Screen recording, to capture the interviewer's audio coming out of your speakers and to take screenshots when you ask for one. Both are standard macOS/Windows permissions you control.
Which platforms does Dusky work with?
We test Dusky against Zoom, Google Meet, and Microsoft Teams. It runs as a separate desktop app alongside your meeting rather than as a plugin, so it generally works with other platforms too — try yours before you rely on it.
Can I delete my local history?
Yes. Session data is stored encrypted on your device only. Signing out wipes it — your CV, saved conversations, session history, and screenshots all go. You can also delete the Dusky data folder yourself at any time.
How does the free trial work?
Download and use Dusky for 15 minutes free. No credit card required. All features are available during the trial so you can test everything before purchasing.
How do I get support?
Email us at [email protected]. We read every message and reply as quickly as we can.
Can I cancel my subscription?
Pro Monthly subscribers can cancel anytime from their account settings. Your access continues until the end of your current billing period.
Ready for your next interview?
Download Dusky and walk into every interview with confidence. Your invisible companion is ready when you are.
macOS 12+ (Monterey or later)
Apple Silicon or Intel
Installs on macOS 11, tested on 12 and later
Windows 10/11 (64-bit)
4GB RAM minimum
Screen recording and microphone permissions required for transcription features.