Synthetic cases
Controlled inputs to check units, equilibrium, consistency, extremes and expected responses. Invalid cases must also produce the correct blocked or pending state.
Inside the process
How we build the calculation engine
A reliable calculation starts before running the software. It starts with choosing the method, defining its scope and checking the implementation.
Product in development · modules and integrations are at different stages
From standards to calculation routines.
We break down the standards relevant to each subject and the adopted technical methods to define inputs, units, assumptions, checks and limits. This analysis guides the implementation of our proprietary engine routines.
01
Define the method's scope
Identify the reference, its edition and scope of application. Record the assumptions and conditions required to use the method.
02
Implement the checks
Translate the adopted procedures into deterministic routines with explicit inputs and handling for invalid or unsupported conditions.
03
Check the results
Compare the implementation with reference cases, test boundaries and repeat checks after changes to detect regressions.
04
Review before use
Examine assumptions, results and unresolved checks in the context of the design. A numerical result still requires a licensed engineer's assessment.
What the tests need to demonstrate.
Validation combines automated tests and technical checks of individual cases. The goal is to find discrepancies and protect the method's limits, as well as check numbers.
Independent references
Comparisons with reference calculations and manual case checks, with explicit assumptions and tolerances. The reference must fit the phenomenon being evaluated.
Regressions
Rerun affected cases when a routine changes. A passing test protects the behavior it checks; it does not by itself establish correctness for every design situation.
Test counts and coverage vary by module. External specialist review and testing with professionals and researchers are part of the preparation for public access.
From conversation to reviewed design.
Proposed workflow for the complete platform. The engine performs the calculations; AI organizes information and helps interpret changes; the engineer confirms assumptions and makes decisions.
fablecalc · Model houseInteractive simulation · proposed workflow
One change. The complete path to a result.
Simplified calculations demonstrating the process. AI chat and analysis are scripted; nothing is sent or saved. This is not the proprietary engine or a construction-ready design.
Revision R02 · footing S1 / column P1
Choose assumptions and simulate the change.
Stage detail · 01
The engineer describes the design and supplies documents, geometry, loads, materials and ground data.
Did an assumption change? The comparison and previews are invalidated; confirm and recalculate again.
Conversation · scripted
Engineer
The column load changed. Recalculate S1 with 1800 kN.
Change analysis · R01 → R02
The comparison appears after confirmation and calculation.
Completing this review only advances the simulation; it does not approve an engineering design.
Deliverables · simulated previews
DXF / DWG · Revit / IFC · printingConfirm assumptions and review the result to unlock previews.
Destinations in the proposed workflow. This demo generates no files and sends no BIM model.
↻ Did a load, geometry or material change? Confirm new assumptions → recalculate → compare → review again.
AI does not create formulas during a calculation or replace engineering decisions. An AI explanation does not clear an unresolved engine check.
Example: a column load changed.
The engineer provides the new load. The chat organizes the change and requests confirmation of other relevant inputs. The engine recalculates the foundation; the analysis compares results and highlights affected checks. The engineer reviews the alternative before updating design documents.
An example of the proposed workflow. The landing page simulation lets you explore input changes with simplified calculations.
Try the simulationFrom results to design tools.
Deliverables need to remain consistent across calculations, drawings, models and documentation. The formats below represent our development direction; availability depends on each module and integration.
Calculation reports and sheets
Documentation of inputs, checks and results for review, printing and plotting.
CAD drawings
Drawing exchange through DXF and workflows involving DWG, depending on the tool and implemented support.
Models and BIM workflow
Integration with Revit/RVT and IFC exchange through connectors and APIs, preserving element review and correspondence with the calculation.
A limited DXF implementation exists for pile caps, with final CAD validation pending. DWG, Revit/RVT and BIM workflows are planned; these are not available construction-ready deliverables.
Methods, evidence and responsibility.
We aim to implement the adopted procedures faithfully and traceably within the verified scope. Determinism means reproducibility; method suitability and input correctness require validation. The code is proprietary. Design review and professional responsibility remain with the licensed engineer.
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