diff --git a/.gitignore b/.gitignore
index 7aaaa17..e0499c4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ public/
 public_*/
 .hugo_build.lock
 csv/webrings.csv
+results/
diff --git a/Makefile b/Makefile
index 9adbb5e..649dd5a 100644
--- a/Makefile
+++ b/Makefile
@@ -43,8 +43,13 @@ lint-css: $(CSS_DIR)/*.css
 	pnpm -s dlx stylelint --config linter-configs/stylelintrc.json --di --rd --rdd $(CSS_DIR)/*.css
 	@#csslint --quiet $(CSS_DIR)
 
-.PHONY: lint-html
-lint-html:
+.PHONY: validate-json
+validate-json:
+	jq -reM '""' $(OUTPUT_DIR)/manifest.min.*.webmanifest 1>/dev/null
+	jq -reM '""' $(OUTPUT_DIR)/webfinger.json 1>/dev/null
+
+.PHONY: validate-html
+validate-html:
 	$(VNU) --stdout --format json --skip-non-html --also-check-svg $(OUTPUT_DIR) | sh scripts/filter-vnu.sh
 
 .PHONY: hint
@@ -53,7 +58,7 @@ hint: hugo .hintrc-local
 	rm .hintrc-local
 
 .PHONY: lint-local
-lint-local: lint-css lint-html
+lint-local: validate-html validate-json lint-css
 
 # dev server, includes future and draft posts
 .PHONY: serve
diff --git a/Makefile.online b/Makefile.online
index 057012e..fae4b9c 100644
--- a/Makefile.online
+++ b/Makefile.online
@@ -19,12 +19,16 @@ hint-online:
 	hint --config linter-configs/hintrc -f codeframe $(URL)
 lighthouse:
 	mkdir -p $(CHROME_PROFILE)
-	CHROME_PATH=$(CHROME_PATH) CHROME_PROFILE=$(CHROME_PROFILE) JS_FLAGS='' lighthouse $(URL) $(LIGHTHOUSE_ARGS)
+	CHROME_PATH=$(CHROME_PATH) CHROME_PROFILE=$(CHROME_PROFILE) JS_FLAGS='' lighthouse $(URLS) $(LIGHTHOUSE_ARGS)
 	rm -rf $(CHROME_PROFILE)
 redbot:
 	redbot_cli -a $(URL)
 axe:
 	axe $(URLS) --chrome-options $(CHROME_FLAGS_COMMA) --chromedriver-path=$(CHROMEDRIVER_PATH) --show-errors
+equal-access:
+	@echo $(URLS) | tr ' ' '\n' >urls.txt
+	achecker --reportLevels violation,recommendation,potentialrecommendation urls.txt
+	rm urls.txt
 
 all: lighthouse hint-online
 
diff --git a/scripts/bin/check-whole-site b/scripts/bin/check-whole-site
new file mode 100755
index 0000000..5d58a14
--- /dev/null
+++ b/scripts/bin/check-whole-site
@@ -0,0 +1,65 @@
+#!/usr/bin/env dash
+
+set -e -u
+
+# the name of this program
+progname="$(basename "${0}")"
+
+help_text="Usage:
+
+Validate the site's markup, CSS, and accessibility.
+
+Uses xmllint to to check well-formedness and the Nu HTML Checker to
+check (X)HTML5 and CSS validity on every markup file (inc. HTML, XHTML,
+SVG). (xmllint is only relevant if you're using XML syntax).
+
+Lints source CSS files with stylelint.
+
+Uses both axe-core and the IBM Equal Access Checker to test
+accessibility on every page in the sitemap.
+
+Options:
+  -h            Print this help and exit
+  -b            Base URL of site
+"
+
+# TODO: add the following:
+# - check broken internal links
+# - check broken webring links
+# - validate JSON (web app manifest, webfinger)
+
+usage() {
+	printf '%s' "${help_text}"
+}
+
+# when the user passess bad args, send a msg to stderr and exit
+# usage: bad_option <option> <reason>
+bad_option() {
+	echo "${progname}: option ${1}: ${2}" >&2
+	usage >&2
+	exit 1
+}
+
+base_url='http://localhost:8089/'
+
+while getopts "hb" flags; do
+	case ${flags} in
+		h)
+			usage
+			exit 0
+			;;
+		b)
+			base_url="$1"
+			shift
+			;;
+		*)
+			bad_option "${flags}" 'invalid option'
+			exit 1
+			;;
+	esac
+done
+
+make -j1 HUGO_FLAGS=-DF HUGO_BASEURL="$base_url" clean hugo xhtmlize lint-html
+make -j2 -f Makefile.online lint-css axe equal-access URLS="$(curl "$base_url/sitemap.xml" | htmlq loc -t | rg -v '/search/$' | tr '\n' ' ')"
+
+# vi:ft=sh