asc-metadata-sync

name	asc-metadata-sync
description	Sync and validate App Store metadata and localizations with asc, including Fastlane format migration. Use when updating metadata or translations.

ASC Metadata Sync

Use this skill to keep local metadata in sync with App Store Connect.

Two Types of Localizations

1. Version Localizations (per-release)

Fields: description, keywords, whatsNew, supportUrl, marketingUrl, promotionalText

# List version localizations
asc localizations list --version "VERSION_ID"

# Download
asc localizations download --version "VERSION_ID" --path "./localizations"

# Upload from .strings files
asc localizations upload --version "VERSION_ID" --path "./localizations"

2. App Info Localizations (app-level)

Fields: name, subtitle, privacyPolicyUrl, privacyChoicesUrl, privacyPolicyText

# First, find the app info ID
asc app-infos list --app "APP_ID"

# List app info localizations
asc localizations list --app "APP_ID" --type app-info --app-info "APP_INFO_ID"

# Upload app info localizations
asc localizations upload --app "APP_ID" --type app-info --app-info "APP_INFO_ID" --path "./app-info-localizations"

Note: If you get "multiple app infos found", you must specify --app-info with the correct ID.

Fastlane Format Workflow

Export current state

asc migrate export --app "APP_ID" --output "./metadata"

Validate local files

asc migrate validate --fastlane-dir "./metadata"

This checks character limits and required fields.

Import updates

asc migrate import --app "APP_ID" --fastlane-dir "./metadata"

Quick Field Updates

Version-specific fields

# What's New
asc app-info set --app "APP_ID" --locale "en-US" --whats-new "Bug fixes and improvements"

# Description
asc app-info set --app "APP_ID" --locale "en-US" --description "Your app description here"

# Keywords
asc app-info set --app "APP_ID" --locale "en-US" --keywords "keyword1,keyword2,keyword3"

# Support URL
asc app-info set --app "APP_ID" --locale "en-US" --support-url "https://support.example.com"

Version metadata

# Copyright
asc versions update --version-id "VERSION_ID" --copyright "2026 Your Company"

# Release type
asc versions update --version-id "VERSION_ID" --release-type AFTER_APPROVAL

TestFlight notes

asc build-localizations create --build "BUILD_ID" --locale "en-US" --whats-new "TestFlight notes here"

.strings File Format

For bulk updates, use .strings files:

// en-US.strings
"description" = "Your app description";
"keywords" = "keyword1,keyword2,keyword3";
"whatsNew" = "What's new in this version";
"supportUrl" = "https://support.example.com";

For app-info type:

// en-US.strings (app-info type)
"privacyPolicyUrl" = "https://example.com/privacy";
"name" = "Your App Name";
"subtitle" = "Your subtitle";

Multi-Language Workflow

1. Export all localizations:

asc localizations download --version "VERSION_ID" --path "./localizations"

2. Translate the .strings files (or use translation service)

3. Upload all at once:

asc localizations upload --version "VERSION_ID" --path "./localizations"

4. Verify:

asc localizations list --version "VERSION_ID" --output table

Character Limits

Field	Limit
Name	30
Subtitle	30
Keywords	100 (comma-separated)
Description	4000
What's New	4000
Promotional Text	170

Use asc migrate validate to check limits before upload.

Notes

• Version localizations and app info localizations are different; use the right command and --type flag.
• asc migrate validate enforces character limits before upload.
• Use asc localizations list to confirm available locales and IDs.
• Privacy Policy URL is in app info localizations, not version localizations.