diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce01f93fa..e9a6091ac 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+- Reduced Sentry span sampling to 10% outside development. [#1475](https://github.com/sourcebot-dev/sourcebot/pull/1475)
+
 ## [5.1.3] - 2026-07-20
 
 ### Added
diff --git a/packages/backend/src/instrument.ts b/packages/backend/src/instrument.ts
index 87866b378..8b0beccac 100644
--- a/packages/backend/src/instrument.ts
+++ b/packages/backend/src/instrument.ts
@@ -12,6 +12,7 @@ if (!!env.NEXT_PUBLIC_SENTRY_BACKEND_DSN && !!env.NEXT_PUBLIC_SENTRY_ENVIRONMENT
         // to the version for builds that don't pass a commit SHA.
         release: env.NEXT_PUBLIC_BUILD_COMMIT_SHA ?? SOURCEBOT_VERSION,
         environment: env.NEXT_PUBLIC_SENTRY_ENVIRONMENT,
+        tracesSampleRate: env.NEXT_PUBLIC_SENTRY_ENVIRONMENT === 'development' ? 1.0 : 0.1,
     });
 } else {
     logger.debug("Sentry was not initialized");
diff --git a/packages/web/src/instrumentation-client.ts b/packages/web/src/instrumentation-client.ts
index fb0ff0171..7bcbc385f 100644
--- a/packages/web/src/instrumentation-client.ts
+++ b/packages/web/src/instrumentation-client.ts
@@ -15,7 +15,7 @@ if (!!process.env.NEXT_PUBLIC_SENTRY_WEBAPP_DSN && !!process.env.NEXT_PUBLIC_SEN
         integrations: [
             Sentry.browserProfilingIntegration(),
         ],
-        tracesSampleRate: 1.0,
+        tracesSampleRate: process.env.NEXT_PUBLIC_SENTRY_ENVIRONMENT === 'development' ? 1.0 : 0.1,
         // Evaluated once per `Sentry.init()`, i.e. once per page load.
         profileSessionSampleRate: 1.0,
         // Profile only while a sampled root span is active, rather than continuously.
diff --git a/packages/web/src/sentry.edge.config.ts b/packages/web/src/sentry.edge.config.ts
index 77866181f..05c897ac1 100644
--- a/packages/web/src/sentry.edge.config.ts
+++ b/packages/web/src/sentry.edge.config.ts
@@ -10,7 +10,7 @@ if (!!process.env.NEXT_PUBLIC_SENTRY_WEBAPP_DSN && !!process.env.NEXT_PUBLIC_SEN
         dsn: process.env.NEXT_PUBLIC_SENTRY_WEBAPP_DSN,
         environment: process.env.NEXT_PUBLIC_SENTRY_ENVIRONMENT,
 
-        tracesSampleRate: 1.0,
+        tracesSampleRate: process.env.NEXT_PUBLIC_SENTRY_ENVIRONMENT === 'development' ? 1.0 : 0.1,
 
         // Setting this option to true will print useful information to the console while you're setting up Sentry.
         debug: false,
diff --git a/packages/web/src/sentry.server.config.ts b/packages/web/src/sentry.server.config.ts
index cd7d6b98d..6ba395674 100644
--- a/packages/web/src/sentry.server.config.ts
+++ b/packages/web/src/sentry.server.config.ts
@@ -15,7 +15,7 @@ if (!!process.env.NEXT_PUBLIC_SENTRY_WEBAPP_DSN && !!process.env.NEXT_PUBLIC_SEN
         integrations: [
             nodeProfilingIntegration(),
         ],
-        tracesSampleRate: 1.0,
+        tracesSampleRate: process.env.NEXT_PUBLIC_SENTRY_ENVIRONMENT === 'development' ? 1.0 : 0.1,
         // Evaluated once per `Sentry.init()`, i.e. once per server process.
         profileSessionSampleRate: 1.0,
         // Profile only while a sampled root span is active, rather than continuously.