diff --git a/www/content/docs.md b/www/content/docs.md
index 53becd9b1a4..50ee3304d67 100644
--- a/www/content/docs.md
+++ b/www/content/docs.md
@@ -2,7 +2,7 @@
 
 - [builtins](/builtins) - docs for modules built into the language—`Str`, `Num`, etc.
 - [basic-webserver](https://roc-lang.github.io/basic-webserver/) - a platform for making Web servers ([source code](https://github.com/roc-lang/basic-webserver))
-- [basic-cli](https://roc-lang.github.io/basic-cli/0.18.0) - a platform for making command-line interfaces ([source code](https://github.com/roc-lang/basic-cli))
+- [basic-cli](https://roc-lang.github.io/basic-cli/0.19.0) - a platform for making command-line interfaces ([source code](https://github.com/roc-lang/basic-cli))
 - [plans](/plans) - current plans for future changes to the language
 
 In the future, a language reference will be on this page too.
diff --git a/www/content/platforms.md b/www/content/platforms.md
index 4832847ace6..9bfdd2bf91b 100644
--- a/www/content/platforms.md
+++ b/www/content/platforms.md
@@ -7,12 +7,12 @@ Something that sets Roc apart from other programming languages is its <span clas
 Here is a Roc application that prints `"Hello, World!"` to the command line:
 
 ```roc
-app [main] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.17.0/lZFLstMUCUvd5bjnnpYromZJXkQUrdhbva4xdBInicE.tar.br" }
+app [main!] { cli: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
-import pf.Stdout
+import cli.Stdout
 
-main =
-    Stdout.line "Hello, World!"
+main! = |_args|
+    Stdout.line!("Hello, World!")
 ```
 
 Every Roc application, including this one, is built on a _platform_. This application happens to be built on a platform called [basic-cli](https://github.com/roc-lang/basic-cli), which is a platform for building command-line interfaces.
diff --git a/www/content/tutorial.md b/www/content/tutorial.md
index dc569a1a75c..64c5520a4c9 100644
--- a/www/content/tutorial.md
+++ b/www/content/tutorial.md
@@ -146,7 +146,7 @@ Let's move out of the REPL and create our first Roc application!
 Make a file named `main.roc` and put this in it:
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 
@@ -1529,7 +1529,7 @@ Besides being built into the compiler, the builtin modules are different from ot
 Let's take a closer look at the part of `main.roc` above the `main` def:
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 ```
@@ -1663,7 +1663,7 @@ We'll use these four operations to learn about effects.
 Let's revisit that first application.
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 
@@ -1692,7 +1692,7 @@ Note that to call this `Stdin.line!`, you need to provide the unit value `{}` as
 Let's change `main!` to read a line from `stdin`, and then print what we got:
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 import pf.Stdin
@@ -1786,7 +1786,7 @@ In other words, adding this annotation effectively opted us out of `basic-cli`'s
 Here's one way we can handle those errors:
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 import pf.Stdin
@@ -1838,7 +1838,7 @@ Furthermore, if a variable can't possibly contain any useful information, then w
 Let's revisit an earlier example:
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 import pf.Stdin
@@ -1884,7 +1884,7 @@ If an error happended here, we wouldn't know which effectful function was the ca
 One option is to "tag the error" using `Result.map_err` to wrap the error in a [tag](#tags) like so:
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 import pf.Stdin
@@ -1924,7 +1924,7 @@ The above example could be rewritten to the following with no change to how it
 would behave:
 
 ```roc
-app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.18.0/0APbwVN1_p1mJ96tXjaoiUCr8NBGamr8G8Ac_DrXR-o.tar.br" }
+app [main!] { pf: platform "https://github.com/roc-lang/basic-cli/releases/download/0.19.0/Hj-J_zxz7V9YurCSTFcFdu6cQJie4guzsPMUi5kBYUk.tar.br" }
 
 import pf.Stdout
 import pf.Stdin