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ChatGPT

Free✦ Featured

ChatGPT is OpenAI's general-purpose AI assistant, available through the web, desktop apps and mobile. It handles everyday tasks like drafting and editing text, answering research questions, summarising documents, writing and debugging code, and brainstorming. The free tier runs on a smaller model with usage limits; paid plans unlock the latest models, higher message caps, image generation, file uploads and custom GPTs. A voice mode allows spoken conversation, and the API lets developers build ChatGPT-style features into their own products. It is the default starting point for most people new to AI, and remains a strong all-rounder for writing and coding alike.

Claude

Freemium

Claude is Anthropic's AI assistant, known for careful reasoning and long-context work. It is particularly strong at reading and summarising long documents, analysing codebases, and producing structured, well-edited prose. The web, desktop and mobile apps share Projects, which keep reference material and instructions together for recurring work. Claude supports file uploads, image understanding and tool use, and the API offers tiers from small, fast models to the largest for complex reasoning. Business plans add higher usage limits and admin controls. Teams that work with lengthy contracts, research papers or large code repositories tend to prefer it for its accuracy and measured tone.

Grammarly

Freemium

Grammarly is a writing assistant that checks grammar, spelling, punctuation and tone as you type. It works across browsers, desktop apps and mobile keyboards, and integrates with Google Docs, Word, email clients and many web forms. Beyond corrections, it suggests clearer phrasing, flags tone that may land badly, and can rewrite sentences or generate drafts with its AI features. Personal plans cover everyday writing; business plans add style guides, brand tones and admin controls for teams. A free tier fixes basic errors, while paid plans unlock advanced suggestions, plagiarism checks and generative rewriting. It is most valuable for people who write professionally every day.

Copy.ai

Freemium

Copy.ai is an AI writing platform aimed at marketing and sales teams. It generates blog posts, product descriptions, ad copy, emails and social posts from short briefs, and includes workflows that chain prompts together for recurring tasks like content repurposing or prospect research. Brand voice settings keep output consistent across a team, and a large prompt library covers common formats. Integrations push generated content into tools like HubSpot, Salesforce and WordPress. A free plan offers limited credits; paid tiers add unlimited words, multiple seats and workflow automation. It is useful for teams producing high volumes of copy, though all output still needs human editing before publication.