Writing AI apps

A set of small AI tools to help neurodivergent people get unstuck.

Goblin Tools is a collection of single-purpose AI utilities aimed at people who find everyday tasks overwhelming. Its best-known tool, Magic ToDo, recursively breaks a vague task into smaller steps with an adjustable difficulty ('spiciness') setting. Others reword text for tone (Formalizer), gauge the mood of a message (Judge), explain things simply (Professor), estimate effort, and turn brain-dumps into action lists.

AI SEO writer that turns a keyword into a ranking article.

Koala AI is a content suite built around KoalaWriter, which generates publish-ready long-form articles using real-time SERP analysis to fold in the keywords, topics, and entities top results rank for. It pairs with KoalaChat, KoalaImages, internal-linking, and lead-magnet tools, and publishes directly to WordPress, Shopify, Webflow, and Ghost. A limited free trial precedes paid plans starting at $9/month.

Turn an idea into a full book, novel or screenplay with AI.

Squibler is an AI writing platform for long-form fiction and screenwriting that drafts outlines, chapters, characters and settings from a prompt, then helps edit and refine the manuscript. It includes an AI co-author, a distraction-free editor, story templates, and AI image generation for scenes, with support for 80+ languages. Plans range from a limited free tier to paid Plus and Pro subscriptions.

AI-native documentation platform that generates and keeps docs current for humans and agents.

Mintlify is a documentation platform that helps teams author, publish, and continuously maintain developer and product docs. It generates and updates content from a codebase, answers reader questions through an embedded AI assistant, and ships an MCP server so AI agents can read the docs directly. Teams get a hosted docs site with a web editor, custom domains, authentication, and analytics.

AI writing assistant for customer-facing teams.

Sapling is a language-model toolkit that gives customer-facing teams real-time autocomplete, grammar and tone suggestions, and reusable snippets inside helpdesks and CRMs like Zendesk, Salesforce, and Intercom. It exposes an API and SDK to embed the same suggestions into custom apps, plus a browser extension for everyday writing. The company also ships a widely cited AI-content detector.

AI language feedback and editing for academic writing.

Writefull is an academic writing assistant whose language models are trained on millions of published journal articles, giving discipline-aware language feedback, paraphrasing, and copyediting. It generates titles and abstracts, checks LaTeX, and runs automated language revision over a full manuscript. Works on the web and integrates with Microsoft Word and Overleaf.

Augmented-writing guidance that strips bias from job posts and performance feedback.

Textio is an AI writing platform built for HR: it gives real-time guidance as managers and recruiters write job posts, recruiting emails, and performance reviews, flagging biased or off-tone language before it goes out. Its models are trained on a large corpus of HR documents rather than general text, and it ships separate products for recruiting and for manager feedback.

AI writing assistant with autocomplete, web research, and citations.

HyperWrite is an AI writing assistant that drafts, rewrites, and autocompletes text across the web, with research and inline citations. It runs as a web app and a Chrome extension, and adds a personal-assistant agent that can carry out multi-step browser tasks. It is built by OthersideAI, one of the first companies to ship a consumer product on GPT-3.

Plan, write and organize your novel with bring-your-own-key AI.

Novelcrafter is a browser-based platform for fiction and non-fiction authors that pairs a full manuscript editor with a worldbuilding wiki called the Codex for characters, places and lore. AI features — scene generation, summaries, character extraction and beat-to-scene drafting — run through your own provider key, so you choose the model and pay the API rates directly. Plans start at $4/month after a free trial.

An AI writing partner that learns your voice and keeps it consistent everywhere.

An AI writing partner from Every that uses stylometry — analysis of your linguistic patterns — to build a profile of your voice and write in it. It interviews you before drafting, produces three parallel versions to mix and match, and carries your style from tweets to long-form essays.

The AI-native document editor for long-form writing.

Type is a web-based document editor with AI woven directly into the writing surface, letting you summon writing commands and an iterative chat without leaving the page. It targets long-form work — books, screenplays, and stories — with character, scene, and world-building tools and drafts up to 150,000 words. A free perpetual tier covers drafts, with paid plans for power users.

AI autocomplete and writing assistance inline across Gmail, Docs, and the web.

Compose AI is a browser extension that adds AI-powered autocomplete and text generation directly into the fields you already type in — Gmail, Google Docs, and most web apps. It finishes sentences as you write, drafts full emails from a one-line instruction, rephrases text, and supports custom shortcuts to expand snippets. The core extension is free, with a premium tier for personalization features.

Subscription AI storyteller and anime image generator with encrypted stories.

NovelAI is a subscription platform for AI-assisted fiction writing and anime-style image generation, built around Anlatan's own storytelling models rather than general-purpose assistants. Paid tiers include unlimited text generation with adjustable context sizes, plus Anlas credits for its NAI Diffusion image models. Stories are stored end-to-end encrypted, so only the author can read them.

AI academic writing assistant with autocomplete and source-grounded citations.

Jenni is an AI writing workspace for students and researchers. It autocompletes drafts in your voice, grounds claims in uploaded PDFs with citations that link to the exact page and paragraph, and formats references in over 2,600 citation styles with Zotero and Mendeley support. More than 6 million academics have used it.

AI academic writing assistant that takes researchers from draft to journal submission.

An academic writing assistant from Cactus Communications with discipline-aware language editing, paraphrasing, and translation tuned to scholarly prose. Pairs a research finder over 250M+ articles and citations in 10,000+ styles with pre-submission checks for plagiarism, AI-generated text, and 30+ technical requirements. Works on the web and inside Microsoft Word, Google Docs, and Overleaf.

Style and grammar editor with manuscript-level feedback for authors.

ProWritingAid goes beyond grammar to analyze pacing, sentence variety, dialogue tags, and readability, plus AI-driven manuscript critique, beta-reader simulation, and story analysis. It integrates into Word, Google Docs, Scrivener, and browsers, aimed at long-form and fiction writers.

AI rewriting and paraphrasing assistant from AI21 Labs.

Wordtune rewrites and paraphrases sentences with tone control, plus grammar correction, summarization of articles and videos, and a humanizer for AI-sounding text. It runs as a browser extension, web app, and iOS app, and integrates into tools like Gmail and Slack.

AI writing partner built specifically for fiction and novelists.

Sudowrite is an AI writing tool aimed at fiction authors, with a Story Bible for outlining, Write/Expand/Describe tools that draft in the author's voice, and a Canvas for plotting arcs and themes. Unlike general assistants, it is tuned for long-form creative narrative rather than business or marketing copy.

Writing suite for paraphrasing, grammar, and summarizing.

QuillBot is a writing suite centered on paraphrasing, grammar checking, and summarizing, with added tools for citation, plagiarism and AI detection, and translation. It runs on the web, as browser extensions and a Word add-in, and on desktop and mobile, widely used by students and professionals.

AI-native collaborative document editor for serious writers.

Lex is a clean, Google-Docs-style word processor with AI editing built in — feedback, brainstorming, rewriting, and AI commands alongside real-time collaboration and version history. It targets writers who want frontier models inside a focused writing surface rather than a chat sidebar.

Budget AI writing assistant with templates and tone matching.

Rytr generates short-form content across 40+ use cases like emails, ad copy, and social captions, and can mirror a sample of your writing to match tone. It includes grammar checking, plagiarism checks, and a Chrome extension, positioned as a low-cost entry point to AI copywriting.

AI writing assistant for grammar, tone, clarity, and generative drafting.

Grammarly checks grammar, spelling, clarity, and tone across the apps you already write in, and layers generative AI on top for drafting, rewriting, and tone adjustment. It works as a browser extension, desktop app, mobile keyboard, and web editor, with detection for plagiarism and AI-generated text on paid tiers.

AI teammate inside Notion: writing, workspace Q&A, agents, and meeting notes.

Notion AI is the assistant built into the Notion workspace, drafting and editing content, answering questions across your pages and connected apps, taking AI meeting notes, and running custom agents on triggers or schedules. Enterprise Search reaches into Slack, Google Drive, and GitHub, and the Notion Agent can complete multi-step tasks with workspace context.