Alta vs AltTextLab

Alta has no write-up on Specifiction yet; its figures are above.

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.