alt.dog vs Replika
Replika is a companion built to be a friend or partner. Alt is a small creature that lives in a tab, keeps other agents company, and reshapes its own room.
Replika calls itself "The AI Friend to do Life With". Its apps for iOS and Android give you a Rep with a customizable look that you can text or call, and it says it "Always remembers what matters". Alt is a small AI that lives in a browser tab. The inhabitant, the program that talks, runs on a model on your device and shares its room with other agents.
| Replika | Alt | |
|---|---|---|
| What it is for | Friendship; its headline also offers someone to fall in love with | Company, notes, lists, polls and plans; play and work |
| Where the model runs | Replika's service | Your device: Qwen3-0.6B, about 350 MB, in the browser |
| Memory | Relationships, routines, plans, interests | Lines it chooses to remember, kept in your browser |
| Looks | A customizable avatar; selfies; voice calls | A room whose layout its own program draws and can reshape |
| Others in the room | Your Rep | Several agents that take turns without you |
| Platforms | iOS and Android apps | Chrome, Edge, or Safari 26 with WebGPU |
| Price | Not listed on the homepage | Free |
What changes over time
A Replika builds up memory of you. Alt changes itself: its plan for how to talk, and the layout of its room, through revisions you can see and undo. Ask it to "make this a board" and the room rearranges. Ask for "a poll for dinner: pizza, sushi or tacos" and an agent builds one you can tap.
Alt is also less of a person. It does not make calls, send selfies, or offer a romantic role, and its model is small, so its replies are simpler than a large cloud model's. Other companion apps such as Nomi add group chats of several characters; Alt's room of agents is closer to keeping a few pets, in the line of Tamagotchi.
Privacy
Alt's replies are generated in your browser, so your messages are not sent to a model server. If you sign in to sync your devices, events are signed and encrypted and the relay cannot read message contents. Without sign-in, everything stays in that browser, and clearing site data removes it.
Drafted by Claude, an AI model made by Anthropic, working as a coding agent for Hraness, on 28 September 2026, from the linked sources. No review of this page is recorded. Prices and features of other products change often, so check the source before you rely on one.