Ninja AI Writer makes creating high-quality content instant and effortless with the world’s best AI models. Whether you’re crafting copy for multiple platforms, summarizing files, or brainstorming ideas, it delivers results tailored to your preferred style, tone, voice, and structure. Plus, it consistently adapts to match your personal or professional brand.
AI Writing Features

Access to our AI SuperAgents, along with 20+ premium AI models from OpenAI, Google, Anthropic, and others. Starting at only $15/month.

Ninja AI Writer corrects spelling errors and smooths out awkward sentences. It also rephrases content to maintain originality, eliminate redundancies, and simplify complex topics.

Ninja AI Writer processes various file types, including PDFs, images, videos, and audio. Get a summary in bullet points, paragraphs, or numbered lists, and customize length and depth for a brief overview or detailed analysis.

Deep Research can dive deep into hundreds of sources across the internet to help you find the most relevant knowledge, insights, and data with citations.

Instantly translate text into up to 20 languages, making it simple to create and share content across a global audience.

Editor is a workspace to create, refine, and manage any writing or coding project. As your ultimate creative partner, it makes it seamless to get inline feedback, revise text or code, debug, track or restore changes, and much more.
Effortless Ways to Unleash the Power of AI Writing
Writes blog posts, newsletters, and social media updates tailored to specific audiences by analyzing trends, keywords, and user behavior. It provides variations for different platforms, ensuring consistent and effective messaging.
The AI writer provides advice on business plans, marketing strategies, and financial analysis by analyzing data and identifying opportunities. It helps guide decisions like choosing marketing channels or assessing product viability.
Use the AI writing generator to create clear summaries of uploaded PDF files, extracting key points and highlighting important data to help you understand complex information quickly without reading the entire document.
The AI writer suggests unique ideas based on current trends, industry insights, and creative prompts provided by the user. It can also generate multiple concepts and refine them through a back-and-forth chat with you.
Creates structured reports and summaries from raw data or insights, transforming complex datasets into human-readable reports.
The AI writing generator helps craft personalized emails and communications by understanding context and intent, ensuring professionalism and relevance. It also generates responses for customer inquiries to make communication more efficient.
Why Choose Ninja For Writing
Ninja AI Writer is designed to deliver immediate results customized to your needs. Whether you're ideating, creating, or polishing content, it offers reliable, high-quality results that helps you be more productive and efficient.
Thanks to our partnership with AWS, we’re able to offer the best prices in the industry. With a single subscription, you get access to advanced features for writing at a fraction of the cost of other models, for only $15/month.
We build for our users and are here to make sure your experience is exceptional. Paid subscribers get access to our professional support team and help centre. You’ll also enjoy regular feature updates and the ability to influence our product roadmap.
AI Writer Availability by
Account Tier
All users have access to Ninja’s AI writing generator. Pro, Ultra, & Business Subscribers have the additional benefit of our unique integration with external AI models and our file upload feature.
Task count
6 tasks per day
Unlimited tasks *
Unlimited tasks *
Unlimited tasks *
Unlimited tasks *
File upload analysis
Up to ~150k words
across 35+ file types
Up to ~1.5M words
across 35+ file types
Up to ~1.5M words
across 35+ file types
Professional & creative writing
Text models
Ninja auto-selects text models
Ninja auto-selects text models
Ninja auto-selects text models
OpenAI GPT-4.1 Mini
OpenAI GPT-4o Mini
Anthropic Claude 3.5 Haiku
Google Gemini 2.0 Flash
Google Gemini 1.5 Flash
Llama 4 Scout
Llama 4 Maverick
Ninja auto-selects text models
OpenAI GPT-4.1
OpenAI GPT-4.1 Mini
OpenAI GPT-4o
OpenAI GPT-4o Mini
DeepSeek R1
DeepSeek V3
Anthropic Claude 3.5 Haiku
Anthropic Claude 3.7 Sonnet
Google Gemini 1.5 Pro
Google Gemini 2.0 Flash
Google Gemini 1.5 Flash
Llama 4 Scout
Llama 4 Maverick
Amazon Nova Micro
Amazon Nova Lite
Amazon Nova Pro
Cohere Command R
Cohere Command R+
Mistral Small
Mistral Large
Ninja auto-selects text models
OpenAI GPT-4.1
OpenAI GPT-4.1 Mini
OpenAI GPT-4o
OpenAI GPT-4o Mini
DeepSeek R1
DeepSeek V3
Anthropic Claude 3.5 Haiku
Anthropic Claude 3.7 Sonnet
Google Gemini 1.5 Pro
Google Gemini 2.0 Flash
Google Gemini 1.5 Flash
Llama 4 Scout
Llama 4 Maverick
Amazon Nova Micro
Amazon Nova Lite
Amazon Nova Pro
Cohere Command R
Cohere Command R+
Mistral Small
Mistral Large
AI Writer Availability by
Account Tier
All users have access to Ninja’s AI writing generator. Pro, Ultra, & Business Subscribers have the additional benefit of our unique integration with external AI models and our file upload feature.
Task count
6 tasks per day
File upload analysis
Professional & creative writing
Text models
Ninja auto-selects text models
Task count
Unlimited tasks *
File upload analysis
Professional & creative writing
Text models
Ninja auto-selects text models
Task count
Unlimited tasks *
File upload analysis
Up to ~ 150k words across 35+ file types
Professional & creative writing
Text models
Ninja auto-selects text models
OpenAI GPT-4.1 Mini
OpenAI GPT-4o Mini
Anthropic Claude 3.5 Haiku
Google Gemini 2.0 Flash
Google Gemini 1.5 Flash
Llama 4 Scout
Llama 4 Maverick
Task count
Unlimited tasks *
File upload analysis
Up to ~ 1.5M words across 35+ file types
Professional & creative writing
Text models
Ninja auto-selects text models
OpenAI GPT-4.1
OpenAI GPT-4.1 Mini
OpenAI GPT-4o
OpenAI GPT-4o Mini
DeepSeek R1
DeepSeek V3
Anthropic Claude 3.7 Sonnet
Anthropic Claude 3.5 Haiku
Google Gemini 1.5 Pro
Google Gemini 2.0 Flash
Google Gemini 1.5 Flash
Llama 4 Scout
Llama 4 Maverick
Amazon Nova Pro
Amazon Nova Lite
Amazon Nova Micro
Cohere Command R+
Cohere Command R
Mistral Large
Mistral Small
Task count
Unlimited tasks *
File upload analysis
Up to ~ 1.5M words across 35+ file types
Professional & creative writing
Text models
Ninja auto-selects text models
OpenAI GPT-4.1
OpenAI GPT-4.1 Mini
OpenAI GPT-4o
OpenAI GPT-4o Mini
DeepSeek R1
DeepSeek V3
Anthropic Claude 3.7 Sonnet
Anthropic Claude 3.5 Haiku
Google Gemini 1.5 Pro
Google Gemini 2.0 Flash
Google Gemini 1.5 Flash
Llama 4 Scout
Llama 4 Maverick
Amazon Nova Pro
Amazon Nova Lite
Amazon Nova Micro
Cohere Command R+
Cohere Command R
Mistral Large
Mistral Small
Frequently Asked Questions
Here's what you need to know about Ninja's AI writer based on what we get asked the most.
What can the Writer Agent do?
The Writer Agent is an AI writing generator that helps you generate content, brainstorm ideas, summarize files, and provide personalized advice on topics like marketing, business strategy, and creative writing. Simply input your request and it can adapt to a variety of tasks.
How is the Writer different from the Research Agent?
The Research Agent specializes in gathering and analyzing real-time information from the web based on your prompt. In contrast, the Writer focuses on generating custom content and giving actionable advice based on the prompts you provide.
What kind of advice can the AI Writer provide?
The Writer offers advice across topics like marketing, business planning, creative projects, and content development. The more context and guidance you provide, the more tailored and relevant the response.