Chai and Poly.AI (now branded PolyBuzz) are the two apps people land on when they want character chat without paying for it. Both are mobile-first, both run on libraries of community-made characters, and both position themselves as the easy alternative to the bigger platforms. Spend a week in each, though, and they feel noticeably different — one is built around speed and volume, the other around presentation and range. We’ve tested both. Here’s how they compare on the things that decide whether you’re still opening the app next month.
Quick verdict
- Choose Chai if you want the fastest possible path to a conversation and you don’t mind ads paying for it. Read our full Chai AI review.
- Choose Poly.AI if you want a more polished experience with personas, voice and a deeper library to dig through. Read our full Poly.AI review.
Side-by-side comparison
| Feature | Chai | Poly.AI |
|---|---|---|
| Character library | ★★★★ | ★★★★★ |
| Long-term memory | ★★ | ★★★ |
| Voice experience | ★★ | ★★★★ |
| Speed to first chat | ★★★★★ | ★★★★ |
| Usable free tier | ★★★★ | ★★★★ |
| Best for | Quick, casual, throwaway chats | Browsing, personas, voice |
Two libraries, two browsing styles
Both apps run on user-created characters, but they surface them differently. Chai leans into rapid discovery — the interface encourages you to skim, tap, and bail out of anything that isn’t working within a few messages. That makes it excellent for sampling and poor for commitment; you can burn through a dozen bots in an evening without forming an attachment to any of them. Poly.AI presents its library more like a catalogue, with richer character pages, categories worth browsing and a general sense that someone curated the shelf. Quality varies in both, because community libraries always do. The practical difference is that Chai wants you moving and Poly.AI wants you choosing.
Memory and conversation quality
Neither app is a memory specialist, and if long-term continuity is what you’re after, both will disappoint you eventually. Chai is the weaker of the two here: conversations stay coherent in the short run, but characters lose the thread over longer stretches and details you shared early tend not to survive. Poly.AI holds context somewhat better and its persona system helps — you define a profile for yourself once, and characters have something stable to anchor to rather than relying on chat history alone. It’s a workaround rather than real long-term memory, but it noticeably reduces the “who are you again?” problem. Our guide to how AI companion memory works explains why these apps forget and what actually helps.
Voice and extras
This is Poly.AI’s clearest advantage. Voice is a proper part of the product — you can take a call-style conversation with a character rather than reading everything — alongside image generation and a generally more finished set of features. Chai stays close to its original brief: text chat, fast, on your phone. That’s not laziness so much as focus, and the app is lighter and quicker for it. But if hearing your character speak matters to you, Chai isn’t the app, and neither is really the category leader — our best apps for voice chats roundup covers the ones built around it.
Ads, pricing and free tiers
Chai’s defining trait is that it’s ad-supported. You can use a lot of it without paying, and the subscription mainly buys you the removal of interruptions plus higher limits. Whether that’s a good deal depends entirely on your tolerance for an ad landing mid-conversation — for some people it breaks the illusion completely, for others it’s background noise. Poly.AI uses a more conventional freemium structure: a free tier that’s genuinely usable for browsing and chatting, with the premium tier lifting limits and unlocking the better voice and image features. Both free versions are worth testing properly before you spend anything. See our best free AI companion apps roundup for how they stack up against the rest, and our free vs paid guide for when upgrading is actually justified.
Privacy and safety
Ad-supported models change the privacy calculation, and Chai is the one to read up on carefully — advertising generally means more data flowing to third parties than a subscription-funded app requires. Our Is Chai AI Safe? deep-dive covers what it collects and how the ad model affects that. Poly.AI, as a large character platform with community-shared content, carries the usual platform considerations: moderation is applied at scale and imperfectly, characters are public artefacts other people made, and your conversations are stored server-side. In both cases the sensible habits are identical — share deliberately, assume nothing you type is private, and find the account deletion flow before you need it. Our Are AI Companion Apps Safe? guide covers the fundamentals for any app in this category.
The bottom line
Pick Chai if you want character chat as a casual habit — something to open for five minutes, with no setup and no expectation that anything carries over. Pick Poly.AI if you want the same idea executed with more care: better voice, a persona that persists, and a library that rewards browsing. Poly.AI is the more complete app; Chai is the faster one, and for a certain kind of user that’s the whole point. Neither will give you the continuity of a dedicated companion app, so if that’s what you’re actually after, start with our 2026 rankings instead. For other angles, see Chai vs Character.AI, Poly.AI vs Character.AI and Talkie vs Chai, or browse the full comparisons hub.
FAQ
Is Poly.AI better than Chai?
On features, yes — Poly.AI has better voice, a persona system and a more polished library. Chai wins on speed and simplicity. If you value a finished product, take Poly.AI; if you value opening an app and immediately talking to something, Chai does that better.
Can I use either one free?
Yes. Chai’s free tier is ad-supported and fairly generous; Poly.AI’s is a standard freemium tier with limits on the premium features. Both are usable enough to judge the app properly before paying, which is how you should treat them.
Do either of them remember long-term?
Not really. Both are built for character chat rather than an ongoing relationship, and both lose detail over weeks. Poly.AI’s persona feature softens the problem, but if long-term memory is your priority you want a dedicated companion app instead.