Free / Open-sourceHigh-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs.
#1Character.AI records 154,156,370 monthly visits with +2.2% month-over-month growth and Freemium pricing. EasyFunctionCall records 0 monthly visits with 0% growth and Freemium pricing.

Turn OpenAPI and Swagger specs into AI-ready function calls
| Dimension / Metric | ![]() | |
|---|---|---|
| Official Domain | character.ai | easyfunctioncall.com |
| Pricing Model | Freemium | Freemium |
| Monthly Visits | 154.16M (154,156,370) | 0 (0) |
| MoM Traffic Delta |
| +3.28M (+2.2%) |
| 0 (0%) |
| Primary Market & Share | 🇺🇸 United States (29.6%) | 🌐 Global (—) |
|---|
| Direct Visits / mo | 110.73M | 0 |
|---|
| User Rating | 4.4 | 4.2 |
|---|
| Supported Platforms | Website | Website |
|---|
Chat with millions of AI characters or build your own
Browse and chat with a vast library of community and official characters across genres and fandoms.
Design a character's look, backstory, personality and voice, then share it with the community.
Talk with characters using voice chats and Voice Notes, not just typed messages.
Long-form, in-character conversations built for storytelling and immersion rather than quick answers.

Turn OpenAPI and Swagger specs into AI-ready function calls
Ingest standard OpenAPI or Swagger specifications and export function-call parameters ready for AI model tool use.
Generates compact parameter definitions that reduce the context cost of exposing large API surfaces to language models.
Designed to work with popular model endpoints including ChatGPT/OpenAI, Claude, Gemini and Llama family models.
A hosted web service, so teams can convert specs through the browser without maintaining parsing infrastructure.
Free / Open-sourceHigh-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs.
#1Features community-driven roleplay with flexible LLM routing and adult content support, unlike Character.AI's strict filtering.

Offers unfiltered and NSFW character roleplay with multi-model switching, whereas Character.AI strictly enforces safety filters.

SpecialistSpecializes in virtual romantic companions with voice and photo generation, catering more to dating roleplay.

Features millions of user-generated personas with voice playback, offering a similar casual roleplay experience to Character.AI.
Focuses on immersive storytelling and fictional character chats, providing an alternative community roleplay environment.
Provides completely unfiltered anime and fantasy character chats, bypassing Character.AI's rigid safety restrictions.

Combines character chat with persistent memory and visual companions, competing directly in casual roleplay.

SpecialistExcels at long-form fiction writing and collaborative storytelling rather than structured character chat rooms.

SpecialistDelivers deeper personal companion dynamics with advanced memory and realistic selfie generation, but fewer public characters.

Enables open-ended roleplay with custom characters, offering an independent alternative with fewer platform restrictions.

The environments frontier AI trains on, and the agents that do the recurring work
Free / Open-sourceHigh-efficiency open-weight and hosted reasoning AI powered by DeepSeek-V4 and R1 at ultra-low token costs.
Features community-driven roleplay with flexible LLM routing and adult content support, unlike Character.AI's strict filtering.
Offers unfiltered and NSFW character roleplay with multi-model switching, whereas Character.AI strictly enforces safety filters.
SpecialistSpecializes in virtual romantic companions with voice and photo generation, catering more to dating roleplay.
Features millions of user-generated personas with voice playback, offering a similar casual roleplay experience to Character.AI.
Focuses on immersive storytelling and fictional character chats, providing an alternative community roleplay environment.
Provides completely unfiltered anime and fantasy character chats, bypassing Character.AI's rigid safety restrictions.
Combines character chat with persistent memory and visual companions, competing directly in casual roleplay.
SpecialistExcels at long-form fiction writing and collaborative storytelling rather than structured character chat rooms.
SpecialistDelivers deeper personal companion dynamics with advanced memory and realistic selfie generation, but fewer public characters.
Enables open-ended roleplay with custom characters, offering an independent alternative with fewer platform restrictions.
The environments frontier AI trains on, and the agents that do the recurring work