SLO/SLA Calc

Design resilient systems, simulate failures, trace animated input flows, and share editable .slosla models. One purchase. No ads, subscriptions, or in-app purchases.

SLO/SLA Calc helps engineers, architects, SREs, and operators design resilient systems, model availability, and test failure behavior before deployment.

Calculate availability for Series, Parallel, N:M, and Cross-Connected topologies. Estimate device availability using MTBF, MTTR, spare availability, support agreements, EOL status, and repair time. Translate any result into expected downtime per day, week, month, or year.

Save devices and subsystems as reusable Blocks, then arrange them into larger Systems. With Live Modeling, apply temporary failures to Blocks, internal Components, and switches. Remaining Availability updates immediately while animated Red and Blue paths show which inputs survive. Shared paths become Purple, and optional output switches select a healthy single handoff.

Use SLO/SLA Calc to:

• Calculate System and device availability
• Model Series, Parallel, N:M, and Cross-Connected designs
• Assign individual availability values to Components
• Build Systems from reusable Blocks and ordered stages
• Use Direct or Full Cross multi-path handoffs
• Add optional output switches and explicit Ideal Paths
• Visualize complete System topology and verify handoffs
• Simulate Block, Component, and switch failures
• Trace surviving flows in portrait or full-screen landscape
• Compare complete Systems and quantify downtime reduction
• Evaluate a design against a target SLO
• See remaining or exceeded error budget
• Generate and share professional PDF reports
• Export, share, preview, and import editable JSON-based .slosla files
• Edit imported Block Components and recalculate the design
• Learn with a guided tour, examples, formulas, and design guidance

SLO/SLA Calc works entirely offline and stores Blocks and Systems locally on your device. No account is required. Files leave your device only when you choose to export or share them.

One purchase unlocks the complete app. No ads, subscriptions, or in-app purchases.