How do their growth rates compare?

OpenAI Platform has a month-over-month growth rate of -9.6%; WriteHuman has -0.2%.

How does pricing compare?

OpenAI Platform: Paid. Usage-based pay-per-token API billing: GPT-6 Astra at $10/1M input and $50/1M output tokens; GPT-6.1 Sol at $2/1M input and $10/1M output; GPT-6.1 Terra at $1/1M input and $5/1M output; GPT-6 Luna at $0.10/1M input and $0.50/1M output; GPT-Live-1 voice at $0.05/minute; 90% discount on cached inputs and 50% off via Batch API. WriteHuman: Freemium, Paid. Freemium: start with free humanizations, then move to paid subscription plans; current pricing is listed on the official site.

What are alternatives to OpenAI Platform and WriteHuman?

Other tools in related categories include ChatGPT, Google Gemini, Claude, DeepSeek, Grok.

OpenAI Platform vs WriteHuman — Traffic, Pricing & Feature Comparison

OpenAITools

OpenAI Platform vs WriteHuman — Traffic, Pricing & Feature Comparison | OpenAITools.app

Side-by-Side Traffic & Specification Matrix

Dimension / Metric	OpenAI Platform	WriteHuman
Official Domain	openai.com	writehuman.ai
Pricing Model	Paid	Freemium, Paid
Monthly Visits	234.68M (234,678,639)	535.86K (535,861)
MoM Traffic Delta	-24.78M (-9.6%)	-1.21K (-0.2%)
Primary Market & Share	🇺🇸 United States (25.4%)	🇺🇸 United States (32.1%)
Direct Visits / mo	105.1M	165.84K
User Rating	4.3	5
Supported Platforms	Website	Website

OpenAI Platform

Enterprise developer platform and API for deploying GPT-6 Astra, Sol, Luna, and realtime multimodal agents.

GPT-6 & GPT-6.1 Model Lineup with 1.05M Context

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.

Configurable Reasoning Effort Controls

Tune thinking token budgets per API request across six granularity levels (`none`, `low`, `medium`, `high`, `xhigh`, `max`) to balance latency, accuracy, and cost.

Responses API & Native Computer Use Tools

Combine model inference with hosted web search, file search, function calling, and autonomous GUI computer-use actions in a single stateful API call.

GPT-Live-1 Realtime Voice API

Build ultra-low-latency multimodal voice agents billed per second ($0.05/minute) without rounding up to whole minutes.

Strengths & Pros

+100-fold cost flexibility from GPT-6 Luna ($0.10/$0.50 per 1M tokens) up to frontier GPT-6 Astra ($10/$50 per 1M tokens)
+Unified 1.05M-token context window and 128K output limit across the entire flagship GPT-6 and GPT-6.1 family
+90% discount on cached input tokens and 50% Batch API discount dramatically reduce production inference bills