Spell (spell.so) is a web-based AI agent platform that allows users to delegate work to autonomous agents powered by GPT-3.5 and GPT-4. Instead of interacting in a single-threaded chat, users can spin up multiple independent agent workers simultaneously, with each agent capable of browsing the web, calling plugins, and completing multi-step tasks without manual intervention. The platform's core differentiator is parallel task execution: users can launch dozens of GPT tasks at the same time rather than waiting for each to finish sequentially. This makes it well-suited to content production workflows where several blog posts, social media updates, or research summaries are needed at once. Spell offers multiple agent execution modes, including AutoGPT-style agents that can access the internet and validate sources online, and Plan-and-Execute agents that first construct a step-by-step plan and then execute it using the most appropriate tools. Users choose the agent type depending on the complexity and nature of their task. The platform integrates over 100 plugins, spanning search engines, website scrapers, business productivity tools, and specialized data sources, allowing agents to be customized for specific use cases. A curated prompt and template library covering marketing, software engineering, and content creation lowers the barrier to getting started. Spell targets individual productivity users, marketers, and content teams. As of 2026 it remains an active, commercially available product with tiered subscription plans based on monthly credit allocations. Key features: - Parallel task execution: run many GPT tasks simultaneously without waiting for sequential completion - Autonomous agents powered by GPT-3.5 and GPT-4 with internet access - 100+ plugin integrations (search engines, scrapers, business tools, data sources) - AutoGPT-style agent mode with online source validation - Plan-and-Execute agent mode for structured multi-step tasks - Curated prompt and template library across marketing, engineering, and content categories - Prompt variables for reusable, parameterized workflows - Credit-based usage model with Personal, Professional, and Expert tiers
Personal: $7.50/month (billed annually, 800 credits/month); Professional: $25/month (billed annually, 2000 credits/month); Expert: $41/month (billed annually, 5000 credits/month). Monthly billing also available at higher rates (Personal $9/month, Professional $29/month, Expert $49/month).