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Replit's New AI Coding Agent Builds Full Stack Apps While You Sleep (Replit Agent 3 Review)
Sep 12, 2025
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0:00
Welcome to this live stream. So in this
0:01
live stream, I'll show you a famous AI
0:04
coding company called as Replet has
0:06
released their uh latest agent 3. Uh it
0:09
actually lets you code while you sleep.
0:11
You can build out fullstack application.
0:13
So if you simply write replet agent 3,
0:16
the very first link which comes right
0:18
here, this is their official website
0:20
replet.com/agent3.
0:23
So this is a ultimate agent for coding
0:26
and you can build out any sort of
0:28
application right here.
0:32
So it can actually test and code in the
0:35
background.
0:37
So we have this chat prompt right here.
0:40
And to get started, you can create a
0:43
free account here by signing up using
0:45
your Google account.
0:48
So if you have an idea, you can simply
0:50
write inside the chat prompt and this
0:52
agent 3 will automatically build out
0:54
your application. So it can be a app, it
0:58
can be a game as well. So once you sign
1:00
up,
1:02
you basically tell the idea here what
1:04
sort of application. So I will simply
1:07
say build a image to PDF
1:10
web app.
1:14
So you exactly tell what sort of
1:16
application you want to develop and
1:18
after that uh
1:20
you click on start chat and then it will
1:23
start
1:25
developing this application. So first of
1:27
all it will be in the planning mode and
1:29
then the second step will be the actual
1:33
implementation of the plan to actually
1:35
write the specific kind of code here. So
1:38
this is actually can work while you
1:41
sleep. So it will actually generate the
1:43
application and also give you
1:45
notification whenever it's complete. So
1:48
now you can actually wait for this agent
1:50
3 to build out the entire layout of the
1:53
application. So it is giving you two
1:54
choices. Either you can build the entire
1:57
app. So this will exactly take 20 plus
2:00
minutes. So this will actually the agent
2:03
will build out the full functionality of
2:04
your app or you can have start with a
2:07
design. So best if you want to see a
2:09
design prototype first and then iterate
2:12
on visuals and features. So you can
2:15
actually
2:16
select any of these approaches. So let
2:18
me start with a design and click on
2:20
start designing. So now the agent will
2:23
actually lay out the actual design of
2:25
the image to PDF application that we
2:27
want to have and then it will show you
2:30
the design. First of all, if you like
2:32
the design, then you can
2:35
uh tell it to actually convert that
2:38
design into the actual code.
2:42
So as you can see it is using this
2:44
latest agent 3. So it is just released
2:47
yesterday and then we also have the
2:49
option to deploy the application as
2:51
well. So this is a very popular
2:53
complaint replet in the field of AI
2:55
software development.
2:58
So you can see it has you also have the
3:01
option to notify when your app is ready.
3:04
You can scan this to install their
3:06
replet app Android or iOS application.
3:09
You can scan this code. So whenever it's
3:11
completed you will be notified inside
3:13
your mobile application. So it's also
3:15
available
3:17
as a mobile application as well. So
3:20
now it is actually previewing the actual
3:23
layout of the application. So I just
3:25
need to wait.
3:44
So in the background it will do all the
3:47
task for you this agent three. So now
3:49
you can actually navigate to different
3:51
apps or do all all your work while this
3:54
agent is actually developing your
3:56
application. So this is insane. You will
3:59
get this notification whenever it's
4:00
done. Just scan this QR code and it is
4:04
in the background. It is actually
4:08
doing the designing of your app this
4:10
agent 3.
4:14
So this is inside the plan mode. Then
4:17
inside the edit mode to simply edit the
4:19
files.
4:31
So you can see it is installing the
4:34
necessary modules which are required for
4:36
the application and it is in creating a
4:39
beautiful image to PDF converter with
4:42
drag and drop functionality.
4:44
all the necessary components which are
4:46
involved in it. It is uh
4:49
creating the files in installing the
4:52
necessary commands.
4:54
So this agent 3. So once it is some
4:57
completed you will see the live preview
4:58
of the application on the right hand
5:00
side.
5:34
So these are all the files which are
5:36
generated here. You will see that
5:42
you can even see all the files which are
5:45
generated using this agent three. So it
5:49
has all these components here image to
5:51
PDF. It's divided into multiple
5:53
components. So these are all your UI
5:54
components which are there. Apart from
5:57
that we have the header component, image
5:59
card, image gallery, upload component,
6:02
upload zone.
6:05
So it also creates these pages as well.
6:11
So it's a full stack application as you
6:13
can see. Can go to package.json and
6:16
actually see what sort of.
6:20
So these are all the dependencies which
6:22
it is using right here. React latest
6:24
version which is 18.
6:35
So now you can see uh this is the actual
6:38
design of the application.
6:49
So
7:00
these are the different components right
7:02
here. uh which will it has successfully
7:06
designed the UI of the application. So
7:07
it's one by one showing all the
7:09
components which it has designed. This
7:11
is the uploaded images component. This
7:14
is the homepage where you will see the
7:17
image to PDF uh converter.
7:21
This is your drag and drop interface
7:23
where you simply drag and drop multiple
7:26
images.
7:28
So this is your PDF settings component.
7:30
So this is the advantage of this agent
7:33
3. It specifically shows the preview of
7:36
each component whenever it's coding and
7:39
then it starts your application as well.
7:44
It also have a built-in database as well
7:47
and it also have a mobile application
7:50
and you also can publish this
7:52
application as well. So now it is simply
7:55
restarting the application.
8:24
And thing is that it's completely
8:26
available for free. So I haven't paid
8:29
for any subscription. It's totally free.
8:31
And if you're interested, you can
8:32
upgrade their to the paid plan as well
8:35
to make more applications using this
8:37
agent 3 mode. Now you can see it
8:40
actually deployed this application
8:43
and you can test it out yourself by
8:46
selecting a bunch of images
8:50
and it will look something like this.
8:52
You can even drag the ordering as well.
8:58
And then uh we also can change the
9:00
settings of the PDF document, the page
9:03
size, orientation, image quality and
9:06
then we have this button of generate
9:08
PDF. So if you click this button
9:12
now the image generation. So this is the
9:15
actual design of the application. So you
9:18
can see now it has successfully
9:19
converted all these images to PDF. So
9:21
this is overall agent 3 model of this
9:25
replet website.
9:27
I have created a visual preview of your
9:29
app. If everything looks good to you, I
9:32
can start building the functionality of
9:34
your device. So you can click on build
9:36
functionality and then it will actually
9:39
build out the code for you. So you also
9:42
have can toggle the dark mode as well
9:46
and uh
9:49
then from clicking this button theme you
9:51
can adjust the settings of your
9:52
application by changing the background
9:54
color. So all these things you can
9:56
customize it accordingly. The text color
9:59
you can change like this. You can see
10:04
typography you can change the font of
10:06
your application from here very easily.
10:14
So these are different components colors
10:16
as well. So all these are customizable.
10:18
You can open also the dev tools as well
10:21
right inside this agent mode. So if you
10:23
want to troubleshoot you can open the
10:25
dev tools right here itself and uh if
10:28
you want to open your application in new
10:30
tab you can also do that as well. So
10:32
this will also open this with a unique
10:35
URL.
10:37
So now your application is also deployed
10:40
and this gives you a temporary
10:43
and now to deploy this you click the
10:44
publish button and for this you do need
10:46
to upgrade to a paid plan. So to upgrade
10:50
you have the upgrade option. So right in
10:53
the free plan you get limited replet
10:55
agent access can build up to 10 public
10:58
apps and the pro pro plan start with $25
11:01
per month.
11:03
So definitely check out this uh new
11:05
agent 3 mode that they have released
11:08
this replet website.
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