Quick answer
"De lo contrario" is a phrase which is often translated as "otherwise", and "si no" is a conjunction which is often translated as "unless". Learn more about the difference between "de lo contrario" and "si no" below.
de lo contrario(
deh
 
loh
 
kohn
-
trah
-
ryoh
)
A phrase is a group of words commonly used together (e.g once upon a time).
phrase
1. (general)
a. otherwise
Te invito a la fiesta porque quiero que vengas, de lo contrario, no lo haría.I'm inviting you to the party because I want you to come, otherwise I wouldn't do it.
b. or else
Tendría que operarse, de lo contrario, irá perdiendo gradualmente la visión de ese ojo.You should have an operation, or else you'll gradually lose the sight of that eye.
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si no(
see
 
noh
)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g. The cat and the dog slept.).
1. (except if)
a. unless
No pueden pasar a la sala de conferencias si no son prensa.You cannot go into the conference room unless you are press.
2. (supposing not)
a.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Si no cambia de actitud, va a tener muchos problemas en la vida.If he doesn't change his attitude, he's going to have a lot of trouble in life.
Si no fuera por Merche, nunca lo hubiéramos conseguido.If it weren't for Merche, we'd never have managed it.
b.
This refers to an idiomatic word or phrase for which there is no word-for-word translation.
no direct translation
Si no nos hubieran ocultado información, podríamos haber hecho algo al respecto.Had they not hid information from us, we could have done something about it.
Hace tiempo que hubiera dejado mi puesto si no fuera por el profundo respeto que siento hacia el Presidente.I would have resigned my post long ago if it weren't for my profound respect for the President.
3. (or)
a. otherwise
Prueba a llamarlo por teléfono; si no, siempre puedes mandarle un email.Try ringing him up; otherwise, you can always send him an email.
b. or else
Tendrás que ayudarme en la casa; si no, ya puedes despedirte de un celular nuevo estas Navidades.You'll have to help me with the house chores; or else, you can forget about getting a new cellphone for Christmas.
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