SlimerJS vs. Gaffa

SlimerJS is a free and open-source browser tailored for web development, allowing users to manipulate web pages through external JavaScript scripts. It offers a wide range of capabilities, such as opening web pages, clicking links, and modifying content, which proves beneficial for functional testing, automating interactions, monitoring network activity, capturing screenshots, and scraping online data. Unlike PhantomJS, SlimerJS operates using Gecko, Mozilla Firefox's rendering engine, rather than WebKit, and it supports both headless and non-headless operation modes. The APIs available in SlimerJS are somewhat akin to those in PhantomJS, though there are significant differences in their respective functionalities. Nevertheless, most scripts initially created for PhantomJS remain compatible with SlimerJS, making it easier for developers to transition between the two platforms. This flexibility ultimately improves the overall scripting experience for web developers, allowing them to choose the tools that best suit their needs. As a result, SlimerJS serves as a valuable asset in the web development toolkit.

Gaffa is an API for web scraping and browser automation that gives developers control over real, full browsers with a single request, no headless-browser setup, proxy management, or infrastructure scaling required. Pages render with full JavaScript support by default, matching exactly what a real user would see. The platform covers the full range of automation needs: scraping, AI-powered data extraction into structured JSON using custom schemas, full-page screenshots, PDF export, infinite-scroll scraping, automated form filling, and converting webpages into clean Markdown for AI and LLM workflows. Reliability is built in through a rotating residential proxy network and automatic CAPTCHA and anti-bot handling, so requests succeed even against protected sites. Pricing follows a transparent, credit-based model tied to browser execution time and bandwidth, making costs predictable as usage scales. Gaffa is aimed at AI engineers, data-driven teams, and developers who need dependable, large-scale web data without the overhead of running their own scraping infrastructure.