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Best AI companions where you build your own character
Companion apps where you can design and train your own character, ranked by editorial score with price and platform support.
The default starting point: unmatched variety and the most generous free tier in the category. Best for: Roleplay and chatting with fictional or public-figure characters.
If you want total control and zero subscription, this is where the advanced users live. Best for: Running your own companion UI with your own model.
A deliberately hand-authored cast of six rather than a community character library — you trade variety for characters that keep one consistent voice. Best for: Romance-focused chat with a fixed cast and persistent memory.
Build and ship custom AI chatbots to 8+ channels with plugins and workflows — a create-your-own toolkit, not a fixed companion. Best for: Building and deploying your own chatbot.
The de-facto local model runtime: one command to run open models, free and open-source. Best for: Local model runtime under any custom frontend.
The most generous free tier in the category: unlimited chat on locally run models, 600 cloud messages a day, no card required. Best for: Free roleplay with full privacy on your own hardware.
A developer platform for personality, memory, emotion and voice — build your own interactive characters for games and apps. Best for: Creating AI characters with real memory.
The best pick for people who will actually fill in the backstory — lazy setup buys you a chatbot. Best for: One consistent companion with a detailed backstory.
The easiest way to run open models on your own machine: no data leaves your laptop. Best for: Private local model chat on Mac, Windows and Linux.
A serious writer's workspace: unlimited books, a codex that tracks your lore, and AI via your own API keys. Best for: Writers building long series with AI assistance.
Common questions about this list
How many apps are on this list?
10 apps meet the criteria for “Best AI companions where you build your own character”. We would rather publish a short, honest list than pad it with apps that only half fit.
Which one should I pick first?
Character.AI tops this list with an editorial score of 4.4 out of 5 and costs $7.92/mo. That is a starting point, not a verdict — the card under each entry says who it actually suits.
What is the cheapest option here?
SillyTavern, at Free — and 10 of the 10 listed apps have a free tier you can try first.
Can I sort these by something else?
Yes. The category pages carry the full five-way filter — medium, orientation, price, platform and sort — and the numbers on this list match the numbers there, because both are computed from the same catalogue.