Zero-exposure API key manager. Local AES-256 encryption, autofill, and secure sharing. Keys never leave your device.
Users
4
0 in 30 days
Rating
3.4 / 5
unchanged in 30 days
Ratings
5
0 in 30 days
Store rank
#262K
#218K among extensions
Version
1.1.2
updated 1 Dec 2025
Users
monthly, 11 months
Latest, 16 Oct 2026:4 usersMove the mouse over the chart for any month
Ratings count
monthly, 11 months
Latest, 16 Oct 2026:5 ratingsMove the mouse over the chart for any month
The Chrome Web Store rounds user counts down to the leading digit, so the user line moves in steps. The ratings count is exact and is the better signal of real adoption.
About Cirklu extension
Cirklu - Zero-Exposure API Key Manager
THE PROBLEM:
Every developer has accidentally committed an API key, pasted it into the wrong field, or sent one via Slack. Just one leak can cost thousands in unauthorized usage.
THE SOLUTION:
Cirklu gives you secure, instant access to your API keys without ever exposing them. Smart detection + local encryption + zero-trust architecture = keys that work everywhere but leak nowhere.
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WHAT MAKES CIRKLU DIFFERENT
• Intent-Driven Security - Only saves keys when YOU confirm (no silent scanning)
• True Zero-Exposure - Keys never touch clipboard, never sent to servers
• Developer Velocity - Cmd/Ctrl+K command palette + auto-detect on 50+ platforms
• Encrypted Sharing - Share keys securely with expiration & view limits
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KEY FEATURES
Intelligent Detection & Autofill
→ Smart field detection on OpenAI, Stripe, AWS, GitHub, Supabase, and 40+ services
→ One-click paste buttons appear next to detected fields
→ Command palette (Ctrl+K / ⌘K) for instant fuzzy search
→ Context-aware suggestions based on the website you're on
Military-Grade Security
→ AES-256-GCM encryption (government & banking standard)
→ Master password protection with PBKDF2 and auto-lock
→ Zero-knowledge architecture - we cannot access your keys
→ Secure injection bypasses clipboard to prevent interception
→ Automatic buffer zeroing after use
Encrypted Sharing (Unique to Cirklu)
→ Create time-limited, view-limited encrypted share links
→ Perfect for team onboarding without exposing permanent keys
→ Self-destructing links expire after N views or hours
→ Zero server storage - only encrypted fragments stored locally
Smart Organization
→ Auto-grouping by provider (Stripe, OpenAI, etc.)
→ Environment tagging (test/live/staging)
→ Duplicate detection
→ Masked display (••••abc123)
→ Favorites system
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PRIVACY & SECURITY GUARANTEES
What we NEVER do:
✗ Store your keys on our servers
✗ Send plaintext keys over the network
✗ Scan pages without your explicit action
✗ Collect sensitive telemetry
✗ Require account creation
What we DO:
✓ Encrypt everything locally with AES-256-GCM
✓ Store only in browser's secure storage
✓ Use Web Crypto API for all encryption
✓ Auto-lock after inactivity
✓ Validate extension context to prevent attacks
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PERFECT FOR
→ Solo Developers - Stop switching between password managers
→ Startup Teams - Securely share temporary access
→ Security-Conscious Orgs - Zero-trust architecture
→ API Power Users - Manage 50+ keys across environments
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GETTING STARTED (30 seconds)
1. Install Cirklu
2. Paste an API key anywhere → Cirklu detects it → Click "Save"
3. Press Ctrl+K (or ⌘K) → Search → Enter
No account. No configuration. Just works.
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SUPPORTED SERVICES
Payments: Stripe
Cloud: AWS, Google Cloud Platform
Development: GitHub
(50+ providers)
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PERMISSIONS EXPLAINED
• storage - Save encrypted keys locally
• tabs - Detect website context for relevant suggestions
• alarms - Auto-lock after inactivity (security)
• identity - Optional encrypted cloud backup (Google Drive or Dropbox)
→ Zero-knowledge: all data encrypted before upload
→ Your master key never leaves your device
• all_urls - Enable Ctrl+K and paste detection on any website
→ We do NOT track browsing or read page content
No network permissions. We cannot transmit your keys.
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SUPPORT
General: connect@cirklu.com
Security Reports: connect@cirklu.com
Your keys. Your control. Zero compromise.