Best BYOK AI Chat Apps in 2026: 10 Apps Compared

The best BYOK AI chat app depends on where you chat and what else you need. For a self-hosted team server, Open WebUI or LibreChat are free. For a one-time license and pure chat in the browser, TypingMind is the cheapest over time. For the cheapest iPhone-only client, Pal Chat. If you want native iPhone and Android apps plus the web, with tools built in and your own keys working next to included credits, the pick is Zemith.

That last case is where most people end up once they try to use the same keys on a phone, a laptop and a work computer. Zemith Plus is $15.99 a month ($179.88 a year) and lets you add your own OpenAI, Anthropic and Google API keys. Chats on those providers' models are billed to your provider account and use no Zemith credits, while everything else (Grok, Kimi, Mistral, web search, deep research, files, images) runs on the 1.5 million credits a month included in the plan. Same login on web, iOS and Android.

TL;DR

• As of November 14, 2026, only three apps in this comparison ship native iPhone and Android apps from the stores: Chatbox, LobeHub and Zemith. Pal Chat is Apple-only, BoltAI's iPhone app is in beta, T3 Chat's iOS app is a TestFlight beta, and TypingMind has no native mobile app.
• TypingMind is a one-time license ($39, $79 or $99) and you always need your own key. Over two years, the $79 license costs less than half of Zemith Plus billed yearly ($359.76), so for pure chat it's cheaper.
• Chatbox, LobeHub, T3 Chat and Zemith all sell their own AI usage and also accept your keys. Zemith is the one where a key opens up that provider's top models above your plan: a Plus user with an Anthropic key can chat with Claude 5.5 Opus, which on credits needs Pro ($29.99 a month).
• Open WebUI, LibreChat and Jan are free and open source, but you either run a server or stay on a desktop app.

Best BYOK AI chat apps compared (November 2026)

Everything below was checked on each vendor's own pricing page, download page, docs or App Store listing on November 14, 2026. Prices are in US dollars. "Sells credits too" means the app also offers AI usage you pay the app for, so a key is optional.

Sources: TypingMind licenses, Chatbox pricing and downloads, Pal Chat on the App Store, BoltAI pricing and FAQ, Msty pricing and Studio downloads, LobeHub pricing and downloads, Jan docs, LibreChat, Open WebUI, T3 Chat FAQ and its mobile app announcement, and Zemith's pricing page.

Two notes on the table. BoltAI's pricing page lists Android and the web among its platforms, but its homepage only describes Mac, iPhone and iPad, so we left Android unconfirmed. T3 Chat's FAQ talks about people "bringing your own API key", but no public page says which providers or plans that covers, so we didn't fill the providers cell.

What is a BYOK AI chat app, and why use one?

A BYOK (bring your own key) chat app is a front end that sends your messages to OpenAI, Anthropic, Google or another provider using an API key you created in that provider's developer console. The provider bills you per token; the app charges you for the software, or nothing at all.

People pick BYOK for three reasons. It's often cheaper than a $20 subscription if you chat lightly. You get the exact model you asked for, at the provider's list price, with no plan-level message caps. And your usage sits in your own account, which matters at work when spending has to show up on a company invoice.

The catch is everything around the key. Each provider is a separate account, card and balance. Web search, image generation and file tools usually need extra keys or a pricier license. And on a phone, a lot of BYOK apps either don't exist or make you paste your keys in again.

Which BYOK AI chat app has native iPhone and Android apps?

Chatbox, LobeHub and Zemith, as of November 2026. All three are in the App Store and Google Play and also run on the web or desktop.

The rest split by platform. Pal Chat covers iPhone, iPad, Mac and Vision Pro but not Android. BoltAI is a desktop app first, with a mobile app still marked beta. T3 Chat opened an iOS TestFlight beta on September 10, 2026, and says Android is coming. TypingMind's FAQ answers the mobile question directly: there's no app, add the website to your home screen. Msty, Jan, LibreChat and Open WebUI are desktop or self-hosted web apps; the self-hosted ones work in a phone browser if your server is reachable.

If most of your chats happen on a phone, this narrows the list fast. Chatbox is the free option with your own key on both platforms. Zemith is the option where the phone app has the same tools as the web app (search, deep research, files, Creative Studio) and your keys work in both.

What does each app cost on top of your API bill?

With BYOK you pay the provider either way, so the fair comparison is the app's own price. Here is what the app costs over two years, on each vendor's published pricing:

• Chatbox, Jan, LibreChat, Open WebUI: $0 for the app (you host LibreChat and Open WebUI yourself, which has its own server cost).
• TypingMind: $79 once for the license with web search, or $99 for Premium.
• BoltAI Pro: $99 once at list price, plus optional renewals if you want updates, sync and mobile after year one.
• Pal Chat Pro: $137.98 on the yearly plan.
• Msty Aurum: $298 on the yearly plan, or $349 once for lifetime.
• Zemith Plus: $359.76 on the yearly plan, with 1.5 million credits a month included.

So if all you do is chat on a computer and you already have keys, TypingMind or a free open-source client costs less than Zemith, and we won't pretend otherwise. The Zemith price buys things the others leave to you: the native Android and iPhone apps, web search and deep research without a search key, finished Office files, image and video generation, and credits for every model you don't have a key for. Our TypingMind alternatives and Chatbox alternatives pages go deeper on those two.

Who should pick which BYOK app?

• You want to self-host for a team: Open WebUI or LibreChat. Both are free, both take almost any provider, and LibreChat adds agents and MCP. You run and secure the server. More on LibreChat in our LibreChat alternatives page.
• You want local models on your desktop for free, with cloud keys as an extra: Jan (open source) or Msty Studio's free tier.
• You chat on a computer, only need chat, and like paying once: TypingMind. It's the cheapest option over time for that reader, and the $99 license covers projects, artifacts and MCP.
• You live on a Mac and want deep macOS integration: BoltAI.
• You only use an iPhone and want the cheapest client for your keys: Pal Chat. The download is free, and Pro is $6.99 a month. It has no Android version.
• You want a free cross-platform app for your keys, Android included: Chatbox. The app is free with your own key; Chatbox's paid plans are for its hosted AI.
• You want to try T3 Chat's fast interface: its Pro plan is $8 a month and runs on included usage; check T3 Chat pricing for how its 4-hour meter works before counting on BYOK there.
• You want native iPhone and Android plus the web, real tools, and keys and credits side by side: Zemith. Keep your OpenAI, Anthropic or Google key for the models you use most and let credits cover the rest.

Why Zemith is our pick for most BYOK users

Most BYOK apps make you choose: either the app sells you AI, or you bring every key yourself. Zemith does both in one chat, per provider.

Say you already pay Anthropic for API access at work. On Zemith Plus you add that Anthropic key, and every Claude chat (Claude 5.5 Haiku, Sonnet and Opus) is billed to your Anthropic account and uses no Zemith credits. You don't have keys for xAI, Moonshot or Mistral, so Grok 4.7, Kimi K3.1 Pro and Mistral Large 4 keep running on your plan's credits. You switch between them mid-chat, on your phone or laptop, without changing apps.

Three details make this work better than it sounds on paper:

• A key opens that provider's top models above your plan. Claude 5.5 Opus, GPT 6.1 Sol, GPT 6 Astra, Gemini 4 Argon and Gemini 4 Carbon need Pro ($29.99 a month) on credits. With the matching key, a Plus user at $15.99 can chat with them. Our guide to using Claude Opus with your own API key walks through it.
• The key serves the exact model you picked. No cheaper stand-in, and no silent switch to credits. If the key stops working (revoked, out of quota, billing not set up), the chat stops with an error that says why. Credits apply again only when you switch the key off or remove it.
• Tools still work with a key. Web search, deep research, file creation and image generation run as usual. They use Zemith credits, not your key, so plan for that.

Setting it up takes about a minute. On the web, open Settings and the API Keys tab; in the iPhone or Android app, open the API Keys screen. Pick OpenAI, Anthropic or Google, paste the key, press Test API key to check it with the provider, then Save key. Each key has its own Enable and Disable switch. Keys are stored encrypted, and only the last four characters are shown. The full walkthrough for phones is in AI chat app with your own API key on iPhone and Android, and the feature itself is on the bring your own API key page.

What Zemith's BYOK doesn't do

Be clear on these before you choose it:

• Three providers only. Keys work for OpenAI, Anthropic and Google chat models. OpenRouter keys, other providers' keys and keys for image or video models aren't supported. If you route everything through OpenRouter, TypingMind, Chatbox, Pal Chat or Jan fit that better.
• Paid plans only. The Free plan (1,100 credits a day) can't add keys. Keys start on Plus.
• Chat only. Keys work in normal chats and project chats. Creative Studio, Cloud agent runs, scheduled runs and workflows always use credits.
• It isn't the cheapest way to send tokens. If you never use tools or a phone, a $79 one-time license plus your key costs less.

How we compared

On November 14, 2026 we opened each app's official pricing page, download page, documentation or App Store listing and recorded the price, platforms, whether a key is required, whether the app sells its own AI usage, and the tools it lists. Where an official page didn't say something, we wrote "not confirmed" or "not published" instead of guessing. Zemith's details come from its own app and pricing page.

Bottom line

There isn't one best BYOK AI chat app for everyone. Self-hosters should run Open WebUI or LibreChat, desktop-only chatters will save money with TypingMind, and an iPhone-only user can get by with Pal Chat. But if you want your keys on a real iPhone and Android app and on the web, with search, research, files and images in the same place, and credits for every model you don't hold a key for, Zemith Plus at $15.99 a month is the one that covers it all, and an Anthropic key on it gets you Claude 5.5 Opus without paying for Pro.