WPML String Translation Addon: worth it if you already use WPML

WPML String Translation is a useful part of WPML, but a poor reason to buy WPML on its own. It handles text that does not live in posts, pages, or taxonomy terms: theme labels, widget titles, button text, form messages, plugin settings, error messages, site taglines, and other interface copy. That makes it particularly valuable on WooCommerce sites, membership sites, and heavily customized builds where important text is scattered across several plugins.

The strongest feature is its integration with the rest of WPML. Strings appear in the same translation workflow as regular content, and WPML can automatically detect text as it appears on the front end. With automatic translation enabled, newly detected strings can be picked up alongside posts and pages instead of being handled in a completely separate localization system. WPML also supports strings stored in theme and plugin settings when those products provide the right configuration, and developers can register custom strings through WPML’s hooks and configuration files.

That flexibility is the reason to choose it over simpler tools. TranslatePress is usually easier when you want to click text directly on the front end and translate it in context. Polylang is often a better fit for site owners who want a more modular, WordPress-native setup and do not need WPML’s broader translation-management system. Weglot is quicker to launch and handles much of the technical work remotely, but its ongoing subscription and external translation workflow may be less attractive for large or tightly controlled sites. WPML String Translation makes more sense when WPML is already responsible for pages, products, taxonomies, SEO integrations, and translation assignments.

Where it is genuinely strong

• It reaches text outside normal post and page content, including theme and plugin interface strings.
• It can detect strings while you browse the site, reducing the need to search through every registered text manually.
• It supports custom registration for user-generated or plugin-specific values that WordPress does not expose automatically.
• It fits naturally with WPML’s Translation Dashboard and automatic translation tools.

Where it is weak or annoying

The workflow is not always straightforward. A string may fail to appear because it is generated dynamically, stored in an unsupported setting, loaded through JavaScript, or not registered correctly by the theme or plugin. WPML’s documentation says that missing strings may require manual registration, and its JavaScript detection setting should be switched off after scanning because it can affect performance.

There are also practical performance concerns. WPML support threads describe large icl_strings and translation tables, slow administration, timeouts, and conflicts with caching workflows. One WordPress.org support report traced saves taking more than 20 seconds to repeated cache purges triggered once for every translated link. These are not inevitable on every site, but they make database cleanup, caching, and testing important on large multilingual installations.

Another limitation is review: WPML’s documentation currently states that translations of strings cannot be reviewed in the same way as ordinary translated content. If your team needs a polished, visual approval process for every label, TranslatePress may feel more manageable. The pricing also matters: String Translation is included with WPML Multilingual CMS, listed at €99, and Agency, listed at €199; the €39 Blog plan does not include it. The verdict is therefore clear: good functionality for an existing WPML site, poor value as a standalone justification for adopting WPML.