AI Tool

Nimbus Review

Nimbus is a system-wide AI autocomplete for macOS that predicts typing and displays it as ghost text in most applications, running a language model locally on Apple Silicon for privacy and efficiency.

shipped Aug 26, 2026writingfree

writing

Why it matters

1Nimbus operates entirely offline once its language model is downloaded, ensuring user privacy.

2The application supports 15 languages for multilingual word completion and grammar correction.

3Nimbus is available for free, offering a 14-day free trial for its features.

4It runs directly on Apple Silicon Macs, leveraging local processing for enhanced performance.

About Nimbus

Platforms

macOS

Target Audience

Mac users looking for an AI typing assistant.

Pricing Plans

14-day free trial

Free

• No account required
• No credit card required
• Runs on Apple Silicon

overview

What is Nimbus?

Nimbus is a system-wide AI autocomplete tool that enables Mac users to enhance their writing across applications by predicting the rest of their typing. It runs a language model directly on the user's Mac’s Apple Silicon for enhanced privacy and efficiency, displaying predictions as ghost text in almost any app. The tool's core function is to provide local sentence completion, grammar, spelling, and multilingual word completion, improving writing speed and accuracy. It learns only from completed sentences, never from the sentence being typed or ignored suggestions, and ensures that accepted text can become part of a learned sentence once finished.

features

Key Features of Nimbus

Nimbus offers a suite of features designed to streamline the writing process on macOS, leveraging local AI processing for privacy and performance.

System-wide AI autocomplete for macOS applications.
Predicts typing and displays suggestions as ghost text.
Runs language models directly on Mac’s Apple Silicon for offline processing.
Ensures enhanced privacy by generating predictions locally.
Never suggests text in password or secure input fields.
Learns from completed sentences to adapt to user writing style.
Supports autocomplete and correction in 15 different languages.
Provides text snippets and spelling corrections.
Offers grammar correction capabilities.

use cases

Who Should Use Nimbus?

Nimbus is designed for a range of Mac users who seek to improve their writing efficiency, accuracy, and privacy across various applications.

Mac Users: Individuals seeking a system-wide AI typing assistant to speed up their writing.
Writers: Professionals and casual writers who want to enhance their productivity in composing emails, messages, and documents.
Multilingual Writers: Users who require assistance with word completion, grammar, and spelling in multiple languages (up to 15 supported).
Professionals: Individuals who prioritize privacy and efficiency, benefiting from offline AI processing and local data handling.

how to use

How to Use Nimbus

To begin using Nimbus, users download the application and install it on their Apple Silicon Mac. The system then integrates across most macOS applications, providing real-time typing predictions.

1Download the Nimbus application from nimbus-ai.app.
2Install Nimbus on an Apple Silicon Mac.
3Allow Nimbus to download the chosen language model for offline operation.
4Begin typing in almost any macOS application.
5Observe ghost text predictions appearing as you type.
6Accept predictions by pressing the Tab key or continue typing to ignore them.

pricing

Nimbus Pricing & Plans

Nimbus is offered with a free pricing model, allowing users to access its features without direct cost. It includes a 14-day free trial period for full functionality.

14-day free trial: Free

Pros

+Operates entirely offline once the model is downloaded, ensuring high privacy.
+Leverages Apple Silicon for efficient local processing, enhancing performance.
+Completely free to use after a 14-day trial, making it accessible.
+Supports 15 languages for diverse user needs.
+Integrates system-wide across most macOS applications.
+Never suggests in password or secure fields, prioritizing security.

Cons

−Requires an Apple Silicon Mac, limiting compatibility for Intel Mac users.
−As a free tool, advanced features or dedicated support might be limited compared to paid alternatives.
−Learning is restricted to completed sentences, potentially slowing adaptation to real-time writing nuances.
−The 'ghost text' display might not be preferred by all users, depending on visual preferences.

Similar Tools

Nimbus vs Competitors

Nimbus distinguishes itself in the market of macOS AI autocomplete tools through its free offering and exclusive focus on Apple Silicon for local processing, emphasizing privacy and efficiency.

CotypistOn Stork

It offers inline AI autocomplete across most Mac apps, with all processing happening locally on your Apple Silicon Mac, and adapts to your writing style.

Cotypist provides a free tier with daily limits, whereas Nimbus is entirely free. Both require an Apple Silicon Mac for local processing.

Typeahead↗

It provides fully local, inline autocomplete in every Mac app with a strong emphasis on privacy, ensuring your words never leave your computer.

Typeahead requires a one-time purchase, unlike Nimbus which is free. It supports both Apple Silicon and Intel Macs, offering broader compatibility than Nimbus.

Cotabby↗

It is an open-source, local-first AI autocomplete tool for macOS that runs default Apple Intelligence and other open-source engines directly on your Mac.

Cotabby is open-source and completely free, offering a transparent and community-driven alternative to Nimbus. As an open-source beta, it may be less polished than Nimbus.

TabType↗

It is a free, open-source, 100% on-device AI autocomplete for macOS, built with MLX, aiming to be a private alternative to similar tools.

TabType is an early alpha open-source project, which means it might have more rough edges and require more community involvement compared to the more established Nimbus.

MacAutocomplete↗

It provides system-wide, sentence-level autocomplete by running a local model on Apple Silicon via MLX, working fully offline.

MacAutocomplete is a one-time purchase, unlike Nimbus which is free. It focuses on more comprehensive sentence-level completion across nearly all standard text fields, offering a potentially more advanced prediction experience.

See every Nimbus alternative, compared→

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Visit Nimbus↗

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