<s>
Developed	O
by	O
AdGuard	B-Application
Software	O
Limited	O
,	O
AdGuard	B-Application
offers	O
open	B-Application
source	I-Application
,	O
free	O
,	O
and	O
shareware	B-License
products	O
.	O
</s>
<s>
AdGuard	B-Application
's	O
DNS	O
app	B-Application
supports	O
Microsoft	B-Application
Windows	I-Application
,	O
Linux	B-Application
,	O
macOS	B-Application
,	O
Android	B-Application
and	O
iOS	B-Application
.	O
</s>
<s>
AdGuard	B-Application
is	O
also	O
available	O
as	O
a	O
browser	B-Protocol
extension	I-Protocol
.	O
</s>
<s>
AdGuard	B-Application
Software	O
Limited	O
was	O
founded	O
in	O
2009	O
in	O
Moscow	O
.	O
</s>
<s>
In	O
2014	O
AdGuard	B-Application
Software	O
Limited	O
's	O
products	O
became	O
available	O
in	O
Cyprus	O
to	O
where	O
its	O
headquarters	O
were	O
subsequently	O
moved	O
.	O
</s>
<s>
AdGuard	B-Application
features	O
include	O
:	O
</s>
<s>
AdGuard	B-Application
Home	O
acts	O
as	O
a	O
recursive	O
DNS	O
resolver	O
,	O
which	O
responds	O
with	O
an	O
invalid	O
address	O
for	O
domains	O
that	O
appear	O
in	O
its	O
filter	O
lists	O
quests	O
.	O
</s>
<s>
It	O
is	O
similar	O
to	O
Pi-hole	B-Application
but	O
offers	O
some	O
unique	O
features	O
,	O
including	O
out	O
of	O
the	O
box	O
support	O
for	O
DNS-over-HTTS	B-Protocol
.	O
</s>
<s>
The	O
browser	B-Protocol
extension	I-Protocol
blocks	O
video	O
ads	O
,	O
interstitial	O
ads	O
,	O
floating	O
ads	O
,	O
pop-ups	O
,	O
banners	O
,	O
and	O
text	O
ads	O
.	O
</s>
<s>
It	O
is	O
also	O
able	O
to	O
handle	O
anti-AdBlock	O
scripts	O
.	O
</s>
<s>
AdGuard	B-Application
Content	O
Blocker	O
is	O
an	O
additional	O
browser	B-Protocol
extension	I-Protocol
for	O
browsers	O
Yandex	O
Browser	O
and	O
Samsung	O
Internet	O
,	O
which	O
uses	O
Content	O
Blocker	O
API	B-General_Concept
.	O
</s>
<s>
It	O
downloads	O
filter	O
list	O
updates	O
and	O
asks	O
browsers	O
to	O
enforce	O
them	O
via	O
Content	O
Blocker	O
API	B-General_Concept
.	O
</s>
<s>
AdGuard	B-Application
has	O
Windows	O
and	O
Mac	O
versions	O
,	O
as	O
well	O
as	O
native	O
mobile	O
versions	O
for	O
Android	B-Application
and	O
iOS	B-Application
.	O
</s>
<s>
The	O
application	O
sets	O
up	O
a	O
local	O
VPN	B-Application
,	O
which	O
filters	O
all	O
traffic	O
on	O
the	O
mobile	O
device	O
.	O
</s>
<s>
AdGuard	B-Application
operates	O
recursive	O
name	O
servers	O
for	O
public	O
use	O
.	O
</s>
<s>
AdGuard	B-Application
DNS	O
supports	O
encryption	O
technologies	O
,	O
including	O
DNSCrypt	B-Protocol
,	O
DNS	B-Protocol
over	I-Protocol
HTTPS	I-Protocol
,	O
DNS	B-Protocol
over	I-Protocol
TLS	I-Protocol
,	O
and	O
DNS-over-QUIC	B-Protocol
.	O
</s>
<s>
AdGuard	B-Application
began	O
testing	O
DNS	O
service	O
back	O
in	O
2016	O
,	O
and	O
officially	O
launched	O
it	O
in	O
2018	O
.	O
</s>
<s>
Server	B-Application
Description	O
Default	O
Blocks	O
advertisement	O
and	O
tracking	O
domains	O
.	O
</s>
<s>
While	O
the	O
company	O
's	O
products	O
have	O
earned	O
positive	O
feedback	O
in	O
industry	O
publications	O
,	O
a	O
series	O
of	O
policies	O
by	O
Google	O
and	O
Apple	O
app	B-Application
stores	I-Application
occurred	O
in	O
2014	O
-	O
2018	O
,	O
which	O
impeded	O
user	O
access	O
to	O
AdGuard	B-Application
's	O
mobile	O
applications	O
.	O
</s>
<s>
Macworld	O
mentioned	O
AdGuard	B-Application
for	O
iOS	B-Application
in	O
a	O
list	O
of	O
five	O
"	O
best	O
adblockers	O
for	O
iOS	B-Application
"	O
.	O
</s>
<s>
In	O
April	O
2020	O
,	O
Android	B-Application
Central	O
stated	O
that	O
AdGuard	B-Application
uses	O
"	O
a	O
little	O
more	O
processing	O
power	O
to	O
do	O
its	O
thing	O
than	O
uBlock	B-Protocol
Origin	I-Protocol
"	O
,	O
but	O
it	O
is	O
"	O
the	O
best	O
all-in-one	O
blocking	O
tool	O
for	O
someone	O
who	O
does	O
n't	O
want	O
to	O
use	O
more	O
than	O
one	O
extension	O
"	O
because	O
it	O
blocks	O
crypto	O
mining	O
.	O
</s>
<s>
However	O
,	O
Android	B-Application
Central	O
recommended	O
uBlock	B-Protocol
Origin	I-Protocol
with	O
a	O
dedicated	O
crypto	O
mining	O
blocker	O
over	O
AdGuard	B-Application
.	O
</s>
<s>
Distribution	O
of	O
AdGuard	B-Application
's	O
app	B-Application
for	O
Android	B-Application
was	O
discontinued	O
by	O
Google	B-Application
Play	I-Application
at	O
the	O
end	O
of	O
2014	O
.	O
</s>
<s>
AdGuard	B-Application
for	O
iOS	B-Application
received	O
no	O
updates	O
from	O
the	O
summer	O
of	O
2018	O
until	O
summer	O
2019	O
due	O
to	O
Apple	O
policies	O
at	O
the	O
time	O
against	O
ad	O
blocking	O
via	O
the	O
iOS	B-Application
VPN	B-Application
APIs	B-General_Concept
.	O
</s>
<s>
In	O
September	O
2018	O
,	O
AdGuard	B-Application
was	O
hit	O
by	O
credential	O
stuffing	O
attack	O
.	O
</s>
<s>
AdGuard	B-Application
claims	O
that	O
their	O
servers	O
were	O
not	O
compromised	O
and	O
instead	O
attackers	O
used	O
credential	O
pairs	O
reused	O
by	O
victims	O
on	O
other	O
sites	O
and	O
stolen	O
from	O
those	O
other	O
sites	O
.	O
</s>
<s>
Also	O
,	O
AdGuard	B-Application
pledged	O
to	O
use	O
"	O
Have	O
I	O
Been	O
Pwned	O
?	O
"	O
</s>
<s>
API	B-General_Concept
to	O
check	O
all	O
new	O
passwords	O
for	O
appearance	O
in	O
known	O
public	O
data	O
leaks	O
.	O
</s>
<s>
In	O
November	O
2020	O
,	O
Microsoft	O
Edge	O
Store	O
and	O
Chrome	O
web	O
store	O
were	O
infiltrated	O
with	O
fraudulent	O
add-ons	O
posing	O
as	O
various	O
legitimate	O
VPN	B-Application
browser	B-Protocol
add-ons	I-Protocol
,	O
including	O
NordVPN	B-Application
and	O
AdGuard	B-Application
's	O
VPN	B-Application
add-on	O
.	O
</s>
<s>
AdGuard	B-Application
developers	O
have	O
taken	O
up	O
research	O
in	O
order	O
to	O
inform	O
wider	O
audiences	O
on	O
user	O
privacy	O
,	O
cybersecurity	O
and	O
data	O
protection	O
.	O
</s>
