
Provides direct API access to Google's Gemini models with generous free prototyping tiers, but lacks OpenAI's ecosystem breadth.

OpenAI Platform records 234,678,639 monthly visits with -9.6% month-over-month growth and Paid pricing. ZeroGPT records 32,864,541 monthly visits with +19.7% growth and Freemium, Paid pricing.
AI content detection and a full writing toolkit in one place
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | openai.com | zerogpt.com |
| Pricing Model | Paid | Freemium, Paid |
| Monthly Visits | 234.68M (234,678,639) | 32.86M (32,864,541) |
| MoM Traffic Delta | -24.78M (-9.6%) |
| +5.41M (+19.7%) |
| Primary Market & Share | 🇺🇸 United States (25.4%) | 🇺🇸 United States (43%) |
|---|
| Direct Visits / mo | 105.1M | 8.22M |
|---|
| User Rating | 4.8 | 3.8 |
|---|
| Supported Platforms | Website | Website |
|---|

Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.
Spanning GPT-6 Astra ($10/$50 per MTok), GPT-6.1 Sol ($2/$10), GPT-6.1 Terra ($1/$5), and GPT-6 Luna ($0.10/$0.50), all with a 1,050,000-token context window and 128K max output.
Tune thinking token budgets per API request across six granularity levels (`none`, `low`, `medium`, `high`, `xhigh`, `max`) to balance latency, accuracy, and cost.
Combine model inference with hosted web search, file search, function calling, and autonomous GUI computer-use actions in a single stateful API call.
Build ultra-low-latency multimodal voice agents billed per second ($0.05/minute) without rounding up to whole minutes.
AI content detection and a full writing toolkit in one place
Paste up to 15,000 characters or upload a file and get a highlighted breakdown of which sentences appear AI-written, plus an overall percentage score and a downloadable PDF report.
Beyond text, ZeroGPT offers an AI image detector and an AI video detector that performs frame-level analysis to flag generated or manipulated visuals.
Compare your text against billions of sources through the plagiarism checker, or rewrite and humanize AI text with the paraphraser and AI humanizer while keeping the original meaning.
A bundled writing suite covers summarization, grammar and spelling correction, translation across many languages, a dictionary, word and character counting, citation generation, and an AI email writer.

Provides direct API access to Google's Gemini models with generous free prototyping tiers, but lacks OpenAI's ecosystem breadth.


SpecialistCross-platform writing assistant focused on real-time grammar and tone correction rather than AI content detection.
#2SpecialistPopular paraphrasing assistant focused on rewriting and grammar correction, but lacks dedicated AI detection scanners.
#3
Free / Open-sourceAlibaba Cloud's 4th-generation multimodal AI assistant and foundation model lineup (Qwen4-Max, Qwen4-Plus, Qwen4-Flash & open-weight Qwen4-27B) with 1M context.

Industry-standard AI content detection trusted by educators, offering robust sentence-level analysis similar to ZeroGPT.
Unifies hundreds of third-party models under a single API key, offering greater model choice than OpenAI's curated catalog.

SpecialistAcademic editing platform pairing AI plagiarism detection with professional human proofreaders for student papers.

Provides developer APIs for Zhipu AI's proprietary GLM models, serving as an alternative enterprise foundation model stack.
Combines reliable AI detection with advanced text humanization tools to rewrite machine-generated content naturally.

SpecialistOptimized for lightning-fast serverless execution of generative media and image models, rather than general text LLMs.

Enterprise-grade content verification suite detecting AI text, images, and source code across multiple languages.

Comprehensive content integrity platform specialized in accurate AI detection and plagiarism checking for digital publishers.
Provides direct API access to Google's Gemini models with generous free prototyping tiers, but lacks OpenAI's ecosystem breadth.
SpecialistCross-platform writing assistant focused on real-time grammar and tone correction rather than AI content detection.
SpecialistPopular paraphrasing assistant focused on rewriting and grammar correction, but lacks dedicated AI detection scanners.
Free / Open-sourceAlibaba Cloud's 4th-generation multimodal AI assistant and foundation model lineup (Qwen4-Max, Qwen4-Plus, Qwen4-Flash & open-weight Qwen4-27B) with 1M context.
Industry-standard AI content detection trusted by educators, offering robust sentence-level analysis similar to ZeroGPT.
Unifies hundreds of third-party models under a single API key, offering greater model choice than OpenAI's curated catalog.
SpecialistAcademic editing platform pairing AI plagiarism detection with professional human proofreaders for student papers.
Provides developer APIs for Zhipu AI's proprietary GLM models, serving as an alternative enterprise foundation model stack.
Combines reliable AI detection with advanced text humanization tools to rewrite machine-generated content naturally.
SpecialistOptimized for lightning-fast serverless execution of generative media and image models, rather than general text LLMs.
Enterprise-grade content verification suite detecting AI text, images, and source code across multiple languages.
Comprehensive content integrity platform specialized in accurate AI detection and plagiarism checking for digital publishers.