Free, interactive developer tools to calculate SLA error budgets, test live API endpoint latencies, and debug HTTP response status codes.
Calculate exact permitted downtime per day, week, month, and year for any SLA availability target (e.g. 99.9%, 99.95%, 99.99%, 99.999%).
Test any public or sandbox API endpoint in real-time. Measure latency in milliseconds, verify HTTP status codes, and inspect response headers.
Verify SSL expiration dates, inspect root and intermediate CA chains, test cipher suites, and troubleshoot handshake errors in real-time.
Complete RFC reference and remediation guide for 200, 301, 400, 401, 403, 404, 429, 500, 502, 503, and 504 status codes.
Pre-calculated downtime allowances, formulas, and SRE architecture blueprints for standard SLA tiers.
Standard B2B SaaS benchmark. 1m 26s/day, 8h 45m/year allowed outages.
High-availability cloud systems with automated multi-region failover.
Multi-AZ single-region cloud service agreement baseline.
Internal developer environments and batch processing workflows.
Mission-critical telecom, stock exchange, and banking core infrastructure.
Full comparative reference chart across daily, weekly, monthly, and yearly windows.
Yes. All Uptara developer tools are 100% free with no account or credit card required. You can use them directly in your browser.
The calculator uses precise calendar year (365.25 days) and month (30.4375 days) math to calculate the exact outage window permitted under three nines (99.9%), four nines (99.99%), or any custom SLA percentage.
Yes. You can sign up for a free Uptara account with 10 free monitors to run scheduled checks 24/7 (every 3 minutes on the Free tier, down to 30 seconds on Pro plans) from global edge regions with instant WhatsApp and Slack alerts.
Free reliability tools for developers and engineering teams detecting downtime, tracking response latency, and calculating real SLAs with Uptara.