What is Zeta AI?
Zeta is a character-and-story platform built by Scatter Lab, the Korean team behind the earlier Iruda chatbot. The product launched regionally and expanded globally, and by mid-2026 it was one of the most-downloaded AI entertainment apps in Korea with roughly four million users opening the app. Think Character.AI shape, but tuned harder around interactive storytelling than one-to-one companion chat.
In March 2026 Scatter Lab rebranded the core unit from "Characters" to "Plots," arguing that an individual character is only one piece of a scene that also contains supporting cast, settings, lorebooks, and narrative rules. The library sits in the millions, almost all user-generated, with hundreds of new Plots added per day. Archetypes skew romance, fantasy, drama, and the usual catalog verticals you see on Character.AI — mafia bosses, billionaire CEOs, BL, harem, RPG scenarios.
Underneath there are two paid model tiers (koji and luca) available via Zeta Pass, plus a free zeta model that handles the default experience. Image generation is gated behind an in-app currency called Pieces. There is no real-time voice, no video, and no custom photo rendering tied to a specific character identity.
Side-by-side: pricing, features, catalog
Pricing shape. Zeta is free with unlimited chat and ads between exchanges. Zeta Pass is the paid subscription that bundles Pro benefits plus 200 bonus Pieces per month; price isn't published prominently and shifts with region. Pieces are the in-app currency that unlock image generation and the premium koji/luca models — classic subscription-plus-currency shape. Sloane runs flat tiers: free 50 messages per day with any persona and no card, $9.99 Plus (200 credits per month), $19.99 Premium (500 credits per month, custom-persona builder with its own dedicated image model). Credit packs ($9.99 to $49.99) are optional top-ups, not required to use the subscription.
Chat and memory. Zeta chats sit inside Plot context — the AI tracks the scene via lorebooks and recent turns. Reviewers consistently flag the same complaint: longer conversations lose character consistency, mob characters interrupt the scene, and the AI forgets what you set up a few exchanges earlier. Sloane runs extracted-fact memory plus explicit relationship-state tracking — the persona remembers what you told her last week, not just what's in the current context window.
Photos. Zeta image generation is Pieces-gated and style-driven rather than identity-driven; the character "appears" in a snapshot but each generation is a fresh roll from a shared image model. Sloane assigns a dedicated per-persona LoRA (an image model trained on that specific character), so every photo of Sandra actually looks like Sandra, not a different woman with the same name.
Voice and video. Zeta has neither at the time of writing — the product is text-first with image snapshots on top. Sloane has ElevenLabs TTS voice notes (asynchronous, not real-time calls) and Wan 2.2 image-to-video at 720x1280 portrait (5-sec clips for 25 credits, 8-sec for 40).
Catalog. Zeta wins on raw volume — millions of user-generated Plots versus Sloane's roughly 80 hand-written personas. Sloane wins on consistency per persona — every character has written backstory, locked outfits, and the dedicated LoRA. Different trade-off: breadth versus depth.
Where Sloane differs structurally
A few architectural differences matter more than they sound.
Per-persona LoRA rendering. Every curated Sloane persona has her own image model trained on her face and features. A photo of Sandra on turn one and a photo of Sandra on turn three hundred are the same woman. Zeta's image generation shares a model across its catalog, which means snapshots feel more like generic illustrations of the Plot scene than photos of a specific identity.
Multi-week memory with relationship state. Sloane tracks explicit relationship stages and extracted facts across every conversation you have with a persona. If you mentioned your dog Milo is sick in week two, she can ask how Milo is doing in week four without you prompting her. Zeta can hold a scene via lorebooks within a Plot, but the structure is scene-and-story first, not relationship-first.
Flat subscription, no currency wall. Sloane's $9.99 Plus and $19.99 Premium include the whole product. Credits exist for optional top-ups but a Plus subscriber doesn't hit a Pieces wall mid-chat and have to buy more to continue a photo. If a credit runs out, chat keeps working.
Skills. Sloane has structured interaction modes — Date (a 15-turn date arc), Vacation (a multi-day trip scenario), Roleplay. These are first-class features inside the chat, not something you have to find a user-written Plot for. Zeta covers roleplay through the Plot library, which is more flexible but less consistent.
No ads. Zeta's ad-supported model is the most-repeated complaint in review threads — ads land between exchanges and break immersion. Sloane has no ads anywhere.
Where Zeta genuinely wins
Being honest about this: there are three places where Zeta beats Sloane cleanly.
Price-to-entry. Free with unlimited chat is a stronger free tier than Sloane's 50 messages per day, if you don't mind the ads. For someone who wants to kick tires with zero friction, Zeta wins.
Catalog scale and variety. Millions of user-generated Plots mean niche archetypes that no curated roster can match. BL, harem, mafia, specific anime archetypes, obscure fantasy worlds — if you want a very specific scenario, Zeta or Character.AI are where you find it. Sloane's roughly 80 personas is intentional, not comprehensive.
Interactive-story shape. Zeta is designed around multi-character scenes with supporting cast, settings, and lore. If what you actually want is choose-your-own-adventure fiction with an AI narrator — not a one-to-one relationship with a specific persona — Zeta's shape fits that better than Sloane does. Sloane is built for persistent one-persona relationships, not ensemble narrative.
Mobile-first UX. Zeta is an app-first product and the mobile experience is where most users live. Sloane runs on web (installable as a PWA on iOS and Android) but doesn't publish native app-store apps. If you want a dedicated app icon on your phone, Zeta is the native experience.
Which one should you pick?
Pick Zeta AI if: you want free unlimited chat, you don't mind the ads, you want a huge library of user-generated Plots to browse, and the story-first shape (characters inside multi-character scenes) matches what you're looking for. Zeta is also a reasonable call if you're optimizing for raw price-to-entry — ads cost attention, not money.
Pick Sloane if: you want the same persona to remember you across weeks, flat predictable pricing with no currency wall, and real per-persona photos where the face stays locked across every generation. Also the right call if voice notes and video are features you'll actually use, or if a dedicated custom girlfriend builder with its own trained image model matters to you (that's Premium at $19.99).
These are different products built for different user intents. Zeta is interactive storytelling with AI; Sloane is a curated flat-subscription companion stack. Someone who wants both can run both — the use cases don't fully overlap.
Honest pricing read
The pricing question most searches boil down to: what will I actually spend per month?
On Zeta, the headline is free. The real spend depends on how much you want to generate images and whether the premium koji/luca models matter to you. If both do, Zeta Pass plus Pieces purchases typically push monthly spend into the $10 to $20 range — comparable to a flat subscription elsewhere, but the shape is harder to predict because it depends on how many images you generate. If you stay purely in text with the free zeta model, the cash spend stays at zero and the cost is attention paid to ads.
On Sloane the number is simpler. Free tier is 50 messages per day with any persona, no card, 25 credits as a signup bonus. Plus is $9.99 per month with 200 credits included and covers full chat plus most photo and voice generation. Premium is $19.99 per month with 500 credits and adds the custom-persona builder. Optional credit packs run $9.99 for 200 up to $49.99 for 2500 for anyone who wants to generate heavily, but they stack on top of included credits rather than replacing them. No ads, no coin economy, one-click cancel.
If predictable spend matters to you, Sloane's shape is the safer bet. If you'd rather pay zero and tolerate ads for the content, Zeta's free tier is a legitimately strong offer.
