Altagonist vs AltTextLab

Altagonist is a WordPress plugin that creates image alt text using image metadata and page content. It can process hundreds of images at once and supports 70 languages. Its three quality levels draw on different amounts of context: Lite uses image metadata, Medium also uses page excerpts, and High uses full page content. Each image costs one, two, or three credits respectively. You can turn on automatic generation for uploaded images, choose a default language and quality level, and edit generated tags in the WordPress media library. JPEG, PNG, GIF, and WebP work natively; SVG, AVIF, TIFF, and BMP are converted automatically. The documentation says images are processed in real time and immediately discarded rather than stored. All plans support multiple WordPress sites, with credits shared among sites on the same license key. The Free plan costs nothing and includes 50 monthly credits. Personal, Pro, and Agency are listed as Coming Soon at €5 a month, €12 a month, and €29 a month, respectively. Unused credits do not roll over.

AltTextLab generates image alt text with attention to accessibility, search optimization and page context. It considers page titles, product information, surrounding content and image context when composing descriptions. Users can provide SEO keywords, choose a writing style and set the desired length. The product supports more than 130 languages and bulk processing for image libraries, including large batches of product photos. Listed integrations include WordPress, Webflow, Craft CMS, Drupal, Shopify, WooCommerce, Magento, PrestaShop and Craft Commerce. Developer access includes a REST API, a one-line Web Snippet, and connectors such as Google Tag Manager, Zapier, Make and Pipedream; Chrome, Firefox and Microsoft Edge extensions are also listed. Supported image formats are PNG, JPG, WebP, AVIF and SVG. The free plan includes 25 credits per month, with one credit generating alt text for one image. Pro costs $4/mo billed annually or $5 a month on a monthly plan. Paid-plan credits roll over, while pay-as-you-go credits do not expire.