WindowSill vs Writing Tools

Both offer system-wide AI writing on Windows. This comparison breaks down Writing Tools and WindowSill to help you decide which fits your workflow.

Summary

Writing Tools is a free, open-source application inspired by Apple Intelligence that brings system-wide AI writing assistance to Windows, Linux, and macOS. It lets you select text anywhere, press a hotkey, and instantly proofread, rewrite, adjust tone, summarize, or apply custom prompts using BYOK models like OpenAI or local LLMs. It is entirely free with no subscriptions.

WindowSill is a Windows desktop command bar that provides AI-powered text assistance (grammar fix, rewriting, translation in 35+ languages, custom prompts) alongside productivity features like media control, clipboard history, meeting management, reminders, and image utilities. WindowSill supports BYOK models like OpenAI or local LLMs. It has a free-tier. Premium features are available via a $4/month subscription or a $48 lifetime license.

Feature comparison

WindowSill Writing Tools
Grammar & Spelling AI-powered proofreading via text selection with instant text replacement AI-powered proofreading via text selection with instant text replacement
Tone Adjustment Professional, casual, attention-grabbing, and custom tones presets Friendly and Professional tone presets
Analysis & Rewrite One-click summarize or rewrite One-click summarize or rewrite
Translation 35+ languages with instant translation Via custom prompts (e.g., "translate to French")
Custom AI Prompts Create reusable prompts locally with variables (date/time injection and more) Create reusable prompts locally
Per-Prompt Model Selection Choose different AI models per prompt Not available — uses one configured model globally
AI Chat Not available as a standalone feature Built-in
AI Providers 8 built-in BYOK providers, local LLMs, and any OpenAI-compatible API Local LLMs and any OpenAI-compatible API
Media Control Built-in — Spotify, YouTube, Netflix, Apple Music, and more Not available
Clipboard History With screenshot protection and password hiding Not available
Meeting Control Mute, unmute, leave Teams meetings Not available
Short-Term Reminders Full-screen (ADHD-friendly) and toast notifications Not available
Image & Video Utilities Batch convert, resize, compress Not available
Extensions SDK with growing marketplace Not available
Enterprise & Organization AI provider allow-lists, managed prompts, usage analytics Not available

Platform & Compatibility

WindowSill

  • OS: Windows 10 and 11
  • Architecture: x64 and ARM64
  • Works in: Any application
  • Distribution: Microsoft Store + standalone installer (Pro)

Writing Tools

  • OS: Windows, Linux, macOS
  • Architecture: x64
  • Works in: Any application
  • Distribution: GitHub Releases

Pricing comparison

WindowSill Writing Tools
Price Free tier (no AI); AI from $4/month or $48/year Free
One-Time License $48 lifetime (BYOK only) Free
Enterprise From $3.60/user/month with graduated discounts Not available
AI Prompts Unlimited Unlimited
AI Cost Included in consumer subscription, or BYOK; free with local LLMs BYOK; free with local LLMs
Free Trial 1-week free trial No trial needed

Strengths & Gaps

WindowSill Strengths

  • AI writing as part of a full productivity toolkit
  • Translation into 35+ languages as a first-class feature
  • BYOK with 8 built-in providers, OpenAI-compatible providers, and local LLMs
  • Use different models for different tasks
  • Custom reusable prompts with variable injection (date, time, etc.)
  • Media control, clipboard, reminders built in
  • Privacy-first (local LLMs, screen recording protection)
  • Enterprise AI governance (AI & extensions allow-lists, usage stats)
  • Polished UX with Microsoft Store distribution and auto-updates

WindowSill Gaps

  • AI features require a paid plan
  • Windows only
  • No built-in AI chat without text selection
  • Base app is not open-source (most extensions are open-source)

Writing Tools Strengths

  • Completely free and open-source
  • Cross-platform (Windows, macOS, Linux)
  • BYOK with OpenAI-compatible providers, and local LLMs
  • Summarization with key points, tables, and chat follow-up
  • Lightweight and portable — near-zero CPU usage when idle
  • Custom reusable prompts

Writing Tools Gaps

  • Overwrite the clipboard when using hot-key on a selected text
  • No productivity features beyond writing
  • No per-prompt model selection
  • No dedicated translation feature (relies on custom prompts)
  • No enterprise features (governance, team management, usage stats)
  • No extension or plugin system
  • No Microsoft Store distribution — manual install via GitHub Releases

Which to Choose?

Choose WindowSill if…

  • You want AI writing as part of a broader productivity toolkit.
  • You need per-prompt model selection for different tasks.
  • You need enterprise features like AI governance and usage stats.
  • You want a polished, native app with Microsoft Store auto-updates.
  • You want an always-visible command bar that keeps your tools one keystroke away.

Choose Writing Tools if…

  • You want a completely free AI writing tool.
  • You need cross-platform support (Windows, macOS, Linux).
  • You want a lightweight, portable tool focused purely on writing.
  • You prefer a simple tool without additional productivity features.
  • You can remember keyboard shortcut over time.

Ready to boost your productivity?

Start with WindowSill for free and upgrade when you need more.

Download Free
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