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    Under active development. New calculators and features ship every week. Everything currently runs free while the site matures — pricing pages are a preview, checkout is not open yet.

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    Ultra / integration

    Calculation API

    One endpoint per calculator. The handler loads the same module the page loads, validates against that calculator’s own inputs and calls the same compute — so a client can never be more or less correct than the page. 372 endpoints in the manifest.

    Manifest

    Generated from the catalog, not maintained by hand. Execution mode is resolved by probing each module, so the table never guesses.

    vv1
    Endpoints372Launched calculators
    Finance179POST /api/v1/run/<slug>
    Engineering193POST /api/v1/run/<slug>
    Pro / Ultra owned114 / 43API access is an Ultra capability
    Execution modeCalculators built on the engine shell expose a pure compute(values), so the endpoint runs without a browser. Bespoke pages return 501 and are marked surface.

    Endpoints

    Search by slug or title, then pick one to see its schema and run it live.

    372 shown
    SlugTitleCategoryPlanEndpoint
    401(k) Calculatorfinanceultra/api/v1/run/401k-calculator
    529 College Savings Calculatorfinancepro/api/v1/run/529-college-savings-calculator
    Aeroacoustic Noise Calculatorengineeringfree/api/v1/run/aeroacoustic-turbulence-noise-engine
    Airfoil Lift & Drag Calculatorengineeringpro/api/v1/run/aerodynamic-airfoil-lift-drag-matrix
    Amortization Calculatorfinancepro/api/v1/run/amortization-calculator
    Alternative Minimum Tax Calculatorfinancefree/api/v1/run/amt-calculator
    Anchor Bolt Calculatorengineeringpro/api/v1/run/anchor-bolt-calculator
    Concrete Anchor Designengineeringpro/api/v1/run/anchor-design-concrete
    Angle and Channel Propertiesengineeringfree/api/v1/run/angle-channel-properties
    Annuity Calculatorfinancepro/api/v1/run/annuity-calculator
    ANOVA Calculatorengineeringfree/api/v1/run/anova-calculator
    APR Calculatorfinancefree/api/v1/run/apr-calculator
    APY Calculatorfinancefree/api/v1/run/apy-calculator
    Arc Flash Calculatorengineeringpro/api/v1/run/arc-flash-calculator
    ARM Calculatorfinancepro/api/v1/run/arm-calculator
    AS 3600 Concrete Shearengineeringfree/api/v1/run/as3600-concrete-check
    ASCE 7 Wind Load Calculatorengineeringpro/api/v1/run/asce-wind-load-calculator
    ASME Pipe Thickness Calculatorengineeringpro/api/v1/run/asme-pipe-thickness-calculator
    Asset Location Calculatorfinancefree/api/v1/run/asset-location-calculator
    Auto Lease Calculatorfinancepro/api/v1/run/auto-lease-calculator
    Auto Loan Calculatorfinancepro/api/v1/run/auto-loan-calculator
    Autocallable Note Calculatorfinanceultra/api/v1/run/autocallable-note-calculator
    Average Return Calculatorfinancefree/api/v1/run/average-return-calculator
    Base Plate Calculatorengineeringfree/api/v1/run/base-plate-calculator
    Base Plate Designengineeringfree/api/v1/run/base-plate-design
    Battery Runtime Calculatorengineeringpro/api/v1/run/battery-runtime-calculator
    Beam Deflection & Stress Calculatorengineeringpro/api/v1/run/beam-deflection-calculator
    Beam Shear Calculatorengineeringpro/api/v1/run/beam-shear-calculator
    Bearing Life Calculatorengineeringfree/api/v1/run/bearing-life-calculator
    Black-Litterman Portfolio Calculatorfinancefree/api/v1/run/black-litterman-portfolio-equilibrium-engine
    Black-Scholes Options Calculatorfinancefree/api/v1/run/black-scholes-options-pricing-core
    Boat Loan Calculatorfinancefree/api/v1/run/boat-loan-calculator
    Eccentric Bolt Groupengineeringfree/api/v1/run/bolt-group-eccentric
    Bolt Torque Calculatorengineeringfree/api/v1/run/bolt-torque-calculator
    Bond Duration Calculatorfinancefree/api/v1/run/bond-duration-calculator
    Box Fill Calculatorengineeringpro/api/v1/run/box-fill-calculator
    Brayton Cycle Calculatorengineeringpro/api/v1/run/brayton-cycle-calculator
    Break-Even Calculatorfinancefree/api/v1/run/break-even-calculator
    Bridge Load Ratingengineeringfree/api/v1/run/bridge-load-rating
    Budget Calculatorfinancefree/api/v1/run/budget-calculator

    332 more — narrow the search to see them.

    MCP

    The same handler, exposed as one tool per calculator plus two discovery tools.

    {
  "mcpServers": {
    "zorvlabs": {
      "command": "npx",
      "args": [
        "-y",
        "@zorvlabs/mcp"
      ],
      "env": {
        "ZORVLABS_API_KEY": "<your ultra key>"
      }
    }
  }
}
    No free-form toolThere is deliberately no “ask the AI to calculate” tool. A tool that invents a formula would break the one promise the catalog makes, so the assistant either runs a verified engine or says it cannot.

    Errors

    The API refuses rather than clamps: a silent clamp would return a plausible answer to a question nobody asked.

    StatusCodeWhen
    200okThe engine returned a result.
    400invalid-inputAn input was out of bounds, the wrong type, or unknown. Fields are listed.
    404not-foundNo calculator at that slug.
    501no-engineThe calculator renders through a bespoke surface and has no headless engine.
    500compute-failedThe engine threw. The message is returned unchanged.