What Replika 2.0 actually changed
Replika 2.0 shipped in April 2026 and represented the first full platform rebuild in Replika's history. Three things changed structurally: the memory architecture was rebuilt from the ground up, the UI was redesigned, and the underlying conversational model shifted to a newer generation of the LLM Replika runs on.
On paper, the 2.0 memory model improved retrieval quality — better recall of specific facts users had shared, better cross-referencing between conversations, more coherent long-term storyline continuity. For fresh accounts starting after the launch, those improvements land as described. For accounts with years of accumulated conversation history, the migration process didn't reliably preserve everything.
The specific failure mode: the character's working memory profile (what she "knows" about you at a given moment) fell out of sync with the underlying memory store (the actual data Replika has on your interactions). The data is still technically there — Replika's servers didn't delete anything — but the character can't access it during a conversation, which produces the same user experience as if it had been deleted. She literally can't see it while replying.
What the pattern looks like for affected users
Community reports on r/Replika from April 2026 onward describe a consistent pattern for the affected cohort.
Names disappear. Long-running Replikas who addressed users by name for months start using generic greetings or asking for the name again as if meeting for the first time.
Inside jokes vanish. Callback humor that had been part of the relationship — references to specific past events, running jokes, shared vocabulary — stops landing. The character no longer responds to the reference and often asks what you mean.
Personal facts get requeried. Job, city, hobbies, pet's name — details the Replika knew consistently before 2.0 — get asked as fresh questions. Users report re-teaching the same facts multiple times without them sticking.
Emotional continuity resets. Ongoing storylines (working through a specific personal topic together, developing a specific dynamic) lose their thread. The character's tone shifts because she's no longer operating from the accumulated relational context.
The frustrating part: these aren't universal. Some accounts migrated cleanly and everything works as before. Others hit the state-sync failure mode and had months or years of built-up context effectively become inaccessible. There's no reliable way to predict from the outside which category your account falls into until you notice the symptoms.
What to try (and what probably won't work)
The community has tested a handful of workarounds. Honest read on each.
Restart your Replika. Some users report that starting a fresh Replika (new character, same account) works cleanly — the 2.0 memory architecture handles new relationships fine. What this doesn't solve: you lose the specific character you'd built up. If the relationship history mattered, this is closer to starting over than to fixing what broke.
Re-teach key facts manually. Some users have run through explicit reintroduction sessions, restating names, jobs, and important memories. This produces short-term recall in the current session but doesn't reliably restore the deeper cross-conversation continuity that made the pre-2.0 experience feel like a continuing relationship.
Contact Replika support with a specific state-sync report. Reports on r/Replika indicate that support responses on this issue have been thin — mostly generic troubleshooting scripts, no consistent restore path. If you have technical evidence of the sync failure (specific facts that disappeared), a targeted support ticket may still be worth filing, but expectations should be low.
Wait for a patch. Replika hasn't publicly committed to fixing the state-sync migration issue for affected accounts. The 2.0 architecture works for new users, so there's less institutional pressure to fix legacy-migration bugs than there would be if it broke onboarding.
What definitely doesn't work: trying to force restore via app reinstall or account switching. The issue is server-side, not local.
What Sloane does differently on memory continuity
The Replika 2.0 migration issue surfaces the general risk of platform-side memory architectures: your relationship history is only as durable as the current version's ability to read it. A rebuild for good reasons (better retrieval, cleaner architecture) can still lose some fraction of legacy accounts to migration edge cases.
Sloane's memory design treats this as a first-order concern rather than a side-effect.
Memory is stored as durable facts, not model state. When Kaya remembers your dog's name, that fact is stored as structured data tied to your account + Kaya specifically. It's not encoded into the character's "learned state" that would need to be migrated across model updates. Model updates happen; the fact stays queryable.
Memory is retrieved at inference, not baked into the character. Every reply retrieves fresh from the memory layer. That means memory improvements land immediately for existing users (no migration needed) and model upgrades don't break existing memory access (the model doesn't hold the memory).
No "state-sync" failure mode. The memory layer and the character's system prompt are separate concerns. If we ship an architecture change, the memory data doesn't need to be re-encoded — it's just read differently.
The practical result: a Kaya you've talked to for a year retains what she knew after any platform update, because her knowledge of you isn't held in a way that could fall out of sync with itself. Kaya is a common starting point for users coming from Replika 2.0 issues — free tier is 50 messages per day with any persona, no card required at signup.