Does All in One SEO output hreflang tags

All in One SEO works with multilingual plugins such as Universally and WPML to support localized SEO. AIOSEO doesn't output hreflang tags, instead these come from the multilingual plugin.

What this means for you:

• If you use a confirmed-compatible multilingual plugin (Universally or WPML), AIOSEO integrates with it so your translated pages’ SEO data can be managed correctly. That integration is what’s used to provide proper language/locale signals (including hreflang where the multilingual plugin generates those tags).
• For other multilingual plugins, behavior may vary — AIOSEO may work but it depends on that plugin’s integration with AIOSEO or whether the plugin itself outputs hreflang tags.