Question 1

How is TekRisk different from EFFECTS?

Accepted Answer

EFFECTS, developed by TNO and now maintained by Gexcon, is a Windows desktop application based on the TNO Yellow Book. TekRisk also follows the Yellow Book for fires and outflow, but runs in the browser, works in English and Spanish, adds SLAB for dense gas dispersion and fault and event trees, and has a permanent free plan.

Question 2

Does TekRisk follow TNO Yellow Book methodology?

Accepted Answer

In part. Outflow, pool fire and jet fire (solid flame) follow the Yellow Book (CPR 14E) and reproduce its worked examples. Dense gas dispersion uses SLAB (LLNL), VCE uses TNT equivalence as in CCPS, and probits come from the Green Book and Eisenberg. Each model page in the documentation cites its sources.

Question 3

Are TekRisk results as reliable as EFFECTS?

Accepted Answer

Both tools implement the TNO Yellow Book. TekRisk reproduces the book's worked examples step by step (outflow, pool fire and jet fire), and where its final result differs from the example the page explains why. The cases and deviations are on the model validation page (tekrisk.com/en/docs/validation).

Question 4

Is it easy to transition from EFFECTS to TekRisk?

Accepted Answer

The concepts are the same: source term, weather, threshold zones and probits. EFFECTS projects cannot be imported, so scenarios are recreated by entering the same inputs; the guided tour and the documentation (tekrisk.com/en/docs) cover each model.

Feature	TekRisk	EFFECTS	Advantage
Cloud-Based	Included	Not included	TekRisk Advantage
No Installation Required	Included	Not included	TekRisk Advantage
Multi-Language Support	Included	Not included	TekRisk Advantage
Pool Fire Model	Included	Included	Equal
Jet Fire Model	Included	Included	Equal
Fireball / BLEVE	Included	Included	Equal
Vapor Cloud Explosion (VCE)	Included	Included	Equal
Toxic Dispersion	Included	Included	Equal
TNO Yellow Book Based	Included	Included	Equal
Interactive Maps	Included	Included	Equal
Pricing	Free · Pro US$59.99/mo	US$3,000+/yr	TekRisk Advantage
Free Tier Available	Included	Not included	TekRisk Advantage
Probit Functions	Included	Included	Equal

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TekRisk vs EFFECTS: Feature Comparison

Frequently Asked Questions: EFFECTS vs TekRisk

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