diff --git a/harper-core/default_config.json b/harper-core/default_config.json
index 00143ccb3..697972717 100644
--- a/harper-core/default_config.json
+++ b/harper-core/default_config.json
@@ -3714,6 +3714,13 @@
 								"label": "A Some Time"
 							}
 						},
+						{
+							"Bool": {
+								"name": "CapitalizeOn",
+								"state": true,
+								"label": "Capitalize On"
+							}
+						},
 						{
 							"Bool": {
 								"name": "NakedEye",
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/Ise3PersSing.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/Ise3PersSing.weir
new file mode 100644
index 000000000..d7e2b9ebc
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/Ise3PersSing.weir
@@ -0,0 +1,6 @@
+expr main [(capitalises off of), (capitalises off)]
+
+let message "Did you mean `capitalises on`?"
+let description "Corrects `capitalise off` to `capitalise on`."
+let kind "Usage"
+let becomes "capitalises on"
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/IseLemma.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/IseLemma.weir
new file mode 100644
index 000000000..9c52ec5b2
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/IseLemma.weir
@@ -0,0 +1,8 @@
+expr main [(capitalise off of), (capitalise off)]
+
+let message "Did you mean `capitalise on`?"
+let description "Corrects `capitalise off` to `capitalise on`."
+let kind "Usage"
+let becomes "capitalise on"
+
+test "Ads make money but it seems hard to capitalise off of secret collection" "Ads make money but it seems hard to capitalise on secret collection"
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/IsePast.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/IsePast.weir
new file mode 100644
index 000000000..886649fb3
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/IsePast.weir
@@ -0,0 +1,6 @@
+expr main [(capitalised off of), (capitalised off)]
+
+let message "Did you mean `capitalised on`?"
+let description "Corrects `capitalise off` to `capitalise on`."
+let kind "Usage"
+let becomes "capitalised on"
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/IseProgressive.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/IseProgressive.weir
new file mode 100644
index 000000000..7da3f164c
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/IseProgressive.weir
@@ -0,0 +1,9 @@
+expr main [(capitalising off of), (capitalising off)]
+
+let message "Did you mean `capitalising on`?"
+let description "Corrects `capitalise off` to `capitalise on`."
+let kind "Usage"
+let becomes "capitalising on"
+
+test "curious if anybody is talking about it / capitalising off the new-found fame" "curious if anybody is talking about it / capitalising on the new-found fame"
+test "... start capitalising off of it" "... start capitalising on it"
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/Ize3PersSing.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/Ize3PersSing.weir
new file mode 100644
index 000000000..b9f5c87ec
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/Ize3PersSing.weir
@@ -0,0 +1,8 @@
+expr main [(capitalizes off of), (capitalizes off)]
+
+let message "Did you mean `capitalizes on`?"
+let description "Corrects `capitalize off` to `capitalize on`."
+let kind "Usage"
+let becomes "capitalizes on"
+
+test "The browser capitalizes off of publishers/content providers" "The browser capitalizes on publishers/content providers"
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/IzeLemma.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/IzeLemma.weir
new file mode 100644
index 000000000..8393af728
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/IzeLemma.weir
@@ -0,0 +1,9 @@
+expr main [(capitalize off of), (capitalize off)]
+
+let message "Did you mean `capitalize on`?"
+let description "Corrects `capitalize off` to `capitalize on`."
+let kind "Usage"
+let becomes "capitalize on"
+
+test "A script to buy a certain cryptocurrency as fast as possible to capitalize off of Pump-and-Dump's." "A script to buy a certain cryptocurrency as fast as possible to capitalize on Pump-and-Dump's."
+test "marketing companies wanted to capitalize off those events" "marketing companies wanted to capitalize on those events"
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/IzePast.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/IzePast.weir
new file mode 100644
index 000000000..46cc2983a
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/IzePast.weir
@@ -0,0 +1,9 @@
+expr main [(capitalized off of), (capitalized off)]
+
+let message "Did you mean `capitalized on`?"
+let description "Corrects `capitalize off` to `capitalize on`."
+let kind "Usage"
+let becomes "capitalized on"
+
+test "Notion has capitalized off of this, as well as every popular Chinese app ..." "Notion has capitalized on this, as well as every popular Chinese app ..."
+test "Capitalized off the name recognition of the original project despite having no affiliation ..." "Capitalized on the name recognition of the original project despite having no affiliation ..."
diff --git a/harper-core/src/linting/weir_rules/CapitalizeOn/IzeProgressive.weir b/harper-core/src/linting/weir_rules/CapitalizeOn/IzeProgressive.weir
new file mode 100644
index 000000000..7bc373187
--- /dev/null
+++ b/harper-core/src/linting/weir_rules/CapitalizeOn/IzeProgressive.weir
@@ -0,0 +1,9 @@
+expr main [(capitalizing off of), (capitalizing off)]
+
+let message "Did you mean `capitalizing on`?"
+let description "Corrects `capitalize off` to `capitalize on`."
+let kind "Usage"
+let becomes "capitalizing on"
+
+test "splits it apart into distinct monolgoes, capitalizing off of the semi-structures format" "splits it apart into distinct monolgoes, capitalizing on the semi-structures format"
+test "By capitalizing off the intermediary points -- each step of the way" "By capitalizing on the intermediary points -- each step of the way"