Feature/Option

Free

Subscription

accurate results from state-of-the-art radiative transfer algorithms used by NASA and Universities worldwide

yes

yes

molecular transmission simulations

yes

yes

select from extensive list of atmospheric gases

yes

yes

simulate UV, visible, IR, or microwave regions

yes

yes

identify individual isotopes

yes

yes

specify pressure, temperature and cell length

yes

yes

access latest HITRAN parameters

yes

yes

atmospheric paths simulations

no

yes

molecular radiance/emission simulations

no

yes

blackbody source

no

yes

model instrument functions

no

yes

simulate large wavebands

no

yes

simulate mixtures of gases

no

yes

multiple cells

no

yes

save and recall simulation setups

no

yes

upload and use custom line lists

no

yes

use microns or wavenumbers

no

yes

access HITEMP or GEISA line lists

no

yes

show molecular line positions

no

yes

download text file of results

no

yes

download high resolution postscript or PDF file

no

yes

logo-free graphs

no

yes

logarithmic scale option

no

yes

upload lab or field spectra

no

yes

save and recall spectra

no

yes

plot and compare multiple spectra

no

yes

Doppler shift saved spectra

no

yes

printer friendly output

no

yes

administer your group account

no

yes

technical support

no

yes