cto.new (formerly Backengine) vs Embolden

cto.new lets you build apps, autonomous agent teams, and full AI businesses on frontier models from Anthropic, OpenAI, Gemini, Mistral, Grok, and DeepSeek without supplying a credit card or personal API keys. You spin up web and mobile apps, multi-agent teams, and full AI businesses from a single chat workspace inside hosted cloud sandboxes.

The product centers on agent teams that can browse the web, send email, schedule tasks, and connect to external tools through MCP servers. Integrations listed on the site include Linear, Sentry, Vercel, and Notion, with support for adding any MCP-compatible server. Web app projects ship with Convex as the default backend, giving new builds database, auth, file storage, and serverless functions without separate setup.

Where most AI coding tools sell subscriptions and cap model usage, cto.new keeps a free forever tier that is ad-supported with daily limits that reset each day. Its marketplace sells ready-made multi-agent businesses you deploy in one click, closer to hiring a prefab team than prompting a single chatbot.

The free tier covers frontier models, unlimited AI businesses, web and mobile apps, CTOClaw agents, and MCP integrations. Premium starts at $20 per month for higher usage, pro agent features, and premium model access.

Embolden generates ecommerce copy across 60-plus specialized tools for product descriptions, abandoned cart emails, Facebook ads, and Shopify product pages. You pick a template, add context about your brand and product, and GPT-3.5 returns multiple output options formatted for conversions. The free tier starts at 2,000 words per month with no credit card required.

Generic AI writers hand you a blank chat box and leave formatting up to you. Embolden ships purpose-built templates for ecommerce workflows like cart recovery drips, upsell emails, and Amazon listing features, each structured around copy patterns that top stores already use. That narrow focus trades flexibility for speed when you need a product sale email or meta description in minutes, not a brainstorm session.

Shopify store owners writing product pages and email sequences are the core audience. Amazon sellers filling listing features and agencies batching ad copy for multiple clients also fit. Over 200 customers use Embolden according to the homepage, and outputs save to your account or copy straight to your store.