AltText.ai records 59,873 monthly visits with -10.2% month-over-month growth and Freemium, Free Trial, Paid pricing. Appen records 665,840 monthly visits with +0.2% growth and Contact for Pricing pricing.
AI alt text generation for image SEO and accessibility
Human-validated training data and evaluation services for frontier AI models
| Dimension / Metric | | |
|---|---|---|
| Official Domain | alttext.ai | appen.com |
| Pricing Model | Freemium, Free Trial, Paid | Contact for Pricing |
| Monthly Visits | 59.87K (59,873) | 665.84K (665,840) |
| MoM Traffic Delta | -6.83K (-10.2%) | +1.1K (+0.2%) |
| Primary Market & Share | 🇺🇸 United States (34.3%) | 🇺🇸 United States (22%) |
| Direct Visits / mo | 8.67K | 238.31K |
| User Rating | 4.2 | 4.4 |
| Supported Platforms | Website | Website |
AI alt text generation for image SEO and accessibility
Computer vision analyses each image and produces a concise, human-readable description in the output language you select.
A free crawler inventories your pages and shows exactly which images are missing alt text before you start fixing them.
WordPress, WooCommerce, Shopify, BigCommerce, Magento, Contentful, DatoCMS, Storyblok, Webflow, Cloudinary, Dropbox and Google Drive connectors write alt text where your content already lives.
Process entire media libraries at once or trigger generation automatically on upload, with saved defaults per project.
Human-validated training data and evaluation services for frontier AI models
Chain-of-thought reasoning traces, SME-level RLHF, supervised fine-tuning demonstrations and adversarial red teaming for the most capable models.
Golden trajectories, RL environment design, failure-mode taxonomies and software-engineering-driven deep evaluation for autonomous agents.
Multilingual ASR and conversational speech data, expressive TTS annotation, vision-language model training data, video action labelling and voice-agent evaluation.
LiDAR point-cloud labeling, multi-camera sensor fusion, robot demonstration trajectories, world-model rollouts and embodied interaction logs.
SpecialistConnects teams directly with verified human participants for preference tuning and studies, but lacks managed end-to-end labeling pipelines.
SpecialistConnects teams directly with verified human participants for preference tuning and studies, but lacks managed end-to-end labeling pipelines.
Blends custom software with dedicated human expert teams to handle complex operations, but operates as a bespoke service.
Blends custom software with dedicated human expert teams to handle complex operations, but operates as a bespoke service.
Combines robust data labeling tools with automated workflows, but focuses more on software tooling than managed human workforces.
Combines robust data labeling tools with automated workflows, but focuses more on software tooling than managed human workforces.
Provides enterprise-grade AI training data and model evaluation at massive scale, but often with higher enterprise pricing.
Provides enterprise-grade AI training data and model evaluation at massive scale, but often with higher enterprise pricing.
Delivers advanced multimodal data curation and annotation infrastructure, but requires your own annotation workforce for labeling tasks.
Delivers advanced multimodal data curation and annotation infrastructure, but requires your own annotation workforce for labeling tasks.
SpecialistAgent observability, evaluation, and continuous improvement for production AI
SpecialistAgent observability, evaluation, and continuous improvement for production AI
SpecialistThe multimodal data layer for computer vision and physical AI teams
SpecialistThe multimodal data layer for computer vision and physical AI teams
The AI SEO agent that researches, writes, publishes, and builds links for you
The AI SEO agent that researches, writes, publishes, and builds links for you
Offers pre-packaged AI training datasets and custom data collection services, but with a smaller global crowd than Appen.
Offers pre-packaged AI training datasets and custom data collection services, but with a smaller global crowd than Appen.
Free / Open-sourceProvides a flexible open-source annotation platform for self-hosting, but lacks Appen's managed enterprise human workforce services.
Free / Open-sourceProvides a flexible open-source annotation platform for self-hosting, but lacks Appen's managed enterprise human workforce services.
Describe any image with AI — detailed descriptions, captions, prompts, and text extraction in one place
Describe any image with AI — detailed descriptions, captions, prompts, and text extraction in one place
Supplies expert human annotators for specialized training and evaluation datasets, but operates at a smaller scale.
Supplies expert human annotators for specialized training and evaluation datasets, but operates at a smaller scale.
