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R2 Copilot

R2 Copilot — The First-Ever Privacy-Conscious AI Assistant

★★★★★ 5.0/5
FactScore™ 63.9
VS

WindowSill

AI-powered Universal Command Bar for Windows

FactScore™ 0

Updated February 2026

R2 Copilot WindowSill
Rating 5.0★ N/A
Reviews 18 0
Pros 15 0
FactScore™ 63.9 0

FactScore™ Comparison

FactScore™ weighs both quality (rating) and popularity (reviews) for a fairer ranking than stars alone.

👑
63.9
R2 Copilot FactScore™
★ R2 Copilot wins on FactScore™
—
WindowSill FactScore™

Pros & Cons

Only in R2 Copilot — Pros

Fast performance Privacy features Security measures User-friendly interface Accurate responses Microsoft Office integration Complex query understanding Data control Data retention management Encryption End-to-end encryption Personalized recommendations Privacy policy Secure data handling Transparency

Both tools — Pros

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Only in WindowSill — Pros

No unique pros listed

Only in R2 Copilot — Cons

—

Both tools — Cons

—

Only in WindowSill — Cons

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Details

R2 Copilot WindowSill
Categories Writing assistants, Prompt Engineering Tools Writing assistants, Product add-ons
Platforms Web Web
Became Popular January 30, 2024 September 23, 2025
Website r2copilot.ai getwindowsill.app

Who Should Pick Which?

Choose R2 Copilot if...

  • Fast performance
  • Privacy features
  • Security measures

Choose WindowSill if...

  • No unique pros listed

With a FactScore™ of 63.9 vs 0, R2 Copilot leads in community reception. R2 Copilot uniquely offers Fast performance and Privacy features, while WindowSill stands out for No unique pros listed.

3

What Users Say

R2 Copilot

E
Evgen Jan 30, 2024
★★★★★

With data breaches and privacy concerns on the rise, finding a trustworthy AI assistant has become a challenge. R2 Copilot has proven to be the best private GPT I've tried, offering the dual benefi...

А
Андрей Jan 30, 2024
★★★★★

R2 Copilot is a true miracle of technology! This tool has made my daily work much easier and helped me save a lot of time. The user interface is intuitive, allowing you to quickly get started witho...

WindowSill

No reviews yet

Frequently Asked Questions

Which is better, R2 Copilot or WindowSill?

Based on FactScore™, R2 Copilot leads with a score of 63.9 vs 0. R2 Copilot has a higher rating of 5.0★ compared to N/A★.

What are the pros of R2 Copilot compared to WindowSill?

R2 Copilot uniquely offers: Fast performance, Privacy features, Security measures, User-friendly interface, Accurate responses.

What are the pros of WindowSill compared to R2 Copilot?

WindowSill uniquely offers: No unique pros listed.

Is R2 Copilot better rated than WindowSill?

R2 Copilot is rated 5.0★ from 18 reviews. WindowSill is rated N/A★ from 0 reviews.

What is the FactScore™ of R2 Copilot and WindowSill?

FactScore™ weighs rating and review volume together. R2 Copilot scores 63.9 and WindowSill scores 0.

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