Expert Guide

The Best Private AI Chatbots in 2026

Eight AI chatbots ranked on what they do with your chats by default, how long they keep them, and what a year of paid privacy costs.

Louis CorneloupFounder, Dupple · 920,000+ readers · Updated Oct 2026

Product links may be affiliate links. How we rate 8 tools compared

TL;DR

Short answer: Lumo is the best private AI chatbot for most people in 2026. Proton's chatbot does not log chats, says it never uses your data to train AI models, and stores history with zero-access encryption. Its AI Plus plan is $9.99 a month on yearly billing, which comes to $119.88 a year. If you want to pay nothing, DuckDuckGo AI Chat and Brave Leo both say they do not train on your chats.

The mainstream assistants are stronger on raw capability, but their privacy depends on a setting you have to find. Claude trains on consumer chats unless you switch that off, and keeps them five years if you allow training. The prices and data rules here were checked on vendor pages in October 2026.

Key facts8 tools compared: Lumo, DuckDuckGo AI Chat, Ollama, Venice AI, Brave Leo, Claude, Gemini…

Updated: October 11, 2026
Top pick: Lumo (best for: Anyone who wants a chatbot that logs nothing and trains on nothing)
Top pick price as of October 11, 2026: Lumo: Free; Lumo AI Plus $9.99/mo on yearly billing ($119.88 a year)

8 tools compared: Lumo, DuckDuckGo AI Chat, Ollama, Venice AI, Brave Leo, Claude, Gemini, Mistral Le Chat
DuckDuckGo AI Chat (best for: Everyday questions where you want no training and no server-side chat history): Free; paid Plus and Pro tiers give access to advanced models
Ollama (best for: Developers and power users who want no company server in the loop at all): Free and MIT-licensed; the models run on a computer you supply
Venice AI (best for: Users who want many models and a default that stores no prompt or response): Free plan; Pro $18/mo, Pro Plus $68/mo, Max $200/mo; yearly billing cuts Pro by 16.7%

"Private" is a loose word in AI marketing, so this list asks three questions of every chatbot: does it train its models on your chats, how long does it keep them, and can anyone other than you read them? A consultant pasting a client memo and a finance lead drafting board notes need those answers before the first prompt, not after.

We ranked eight tools on the answers first and on price second. Aipresso data: Toolradar, the software directory we run, tracks 11,051 tools across 343 categories (the header figures on its AI chatbots page, October 2026).

Its profiles for Claude, Ollama and Venice AI are there too.

Top Picks

Based on features, real-world fit, and value for money.

Best Private AI Chatbots in 2026 (No Training on Your Data): 8 tools compared, updated Oct 2026
Tool	Pricing	Best for
Lumo	Free; Lumo AI Plus $9.99/mo on yearly billing ($119.88 a year)	Anyone who wants a chatbot that logs nothing and trains on nothing
DuckDuckGo AI Chat	Free; paid Plus and Pro tiers give access to advanced models	Everyday questions where you want no training and no server-side chat history
Ollama	Free and MIT-licensed; the models run on a computer you supply	Developers and power users who want no company server in the loop at all
Venice AI	Free plan; Pro $18/mo, Pro Plus $68/mo, Max $200/mo; yearly billing cuts Pro by 16.7%	Users who want many models and a default that stores no prompt or response
Brave Leo	Free; Leo Premium is a paid tier for higher limits and more models	Brave browser users who want free chat that Brave does not retain or train on
Claude	Free; Pro $20/mo ($17/mo billed yearly at $200); Max from $100/mo	Writers and coders who want the strongest model and will switch model training off
Gemini	Free; Google AI Plus $4.99/mo, Google AI Pro $19.99/mo, Google AI Ultra from $99.99/mo	Teams on Google's business editions who want the no-training terms in writing
Mistral Le Chat	Free; Pro $14.99/mo; Team $24.99 per user/mo; Enterprise by contact	Buyers who want a cheaper paid plan from a French AI company and will check its training switch

Pricing read from each vendor's own published pricing page, checked Oct 2026. Every vendor here publishes a price.

Lowest monthly figure each vendor publishes, checked Oct 2026. A tilde marks a figure the vendor states approximately. Per-seat and usage charges can sit on top of it. 1 of 8 does not publish a comparable monthly price and is left out rather than estimated.

Lumo

Top Pick

Best for: Anyone who wants a chatbot that logs nothing and trains on nothing

PricingFree; Lumo AI Plus $9.99/mo on yearly billing ($119.88 a year)

+Its comparison table says it does not log your chats

+History is stored with zero-access encryption and can only be decrypted on your own device

+The free plan needs no credit card, so you can check the privacy claim before paying

−The price applies to yearly billing, so check the billing screen for the total before you commit

−Business plan prices are not published, so teams need to ask for a quote

Visit Lumo →

DuckDuckGo AI Chat

Best for: Everyday questions where you want no training and no server-side chat history

PricingFree; paid Plus and Pro tiers give access to advanced models

+Its privacy help page says it does not track how you use the feature, store your prompts or train on your data

+Recent chats can be deleted individually or with the Fire Button

+The free tier routes to models from Anthropic, Mistral and OpenAI, plus two open-weight models hosted by Tinfoil

−Chat history stays on the device where you wrote it, so a new laptop starts with an empty list

−Plus and Pro add advanced models, so check their current price on DuckDuckGo before you buy

Visit DuckDuckGo AI Chat →

Ollama

Best for: Developers and power users who want no company server in the loop at all

PricingFree and MIT-licensed; the models run on a computer you supply

+The MIT license, held by Ollama, lets you use the software without a subscription

+Prompts sent to a model you run yourself stay on your own hardware

+You choose which open model runs, so you can check its license and behavior before you rely on it

−You need enough memory and disk for the model you pick, and setup takes time

−Output quality depends on the open model and your hardware, so expect to compare models before you trust one

Visit Ollama →

Venice AI

Best for: Users who want many models and a default that stores no prompt or response

PricingFree plan; Pro $18/mo, Pro Plus $68/mo, Max $200/mo; yearly billing cuts Pro by 16.7%

+Private mode stores no prompt or response by default, according to Venice's privacy page

+Conversation history can stay on your device, and Venice says it never stores that history on its servers

+End-to-end encrypted mode on Pro means no one, including Venice, can see your data

−Venice says its default Private mode is enforced by contract rather than technical guarantees

−Anonymous mode leaves retention to the underlying model provider, and Venice tells you to assume that provider keeps your content

Visit Venice AI →

Brave Leo

Best for: Brave browser users who want free chat that Brave does not retain or train on

PricingFree; Leo Premium is a paid tier for higher limits and more models

+Brave says Leo does not retain or share chats, or use them for additional model training

+Chats can be saved on your device if you want to come back to them

+Leo Premium adds higher usage limits and more models for heavier use

−Brave does not list a USD price for Leo Premium, so check the current price before you upgrade

−Saved chats live on the device, so history does not follow you to another computer

Visit Brave Leo →

Claude

Best for: Writers and coders who want the strongest model and will switch model training off

PricingFree; Pro $20/mo ($17/mo billed yearly at $200); Max from $100/mo

+Consumer plans list model training as opt-out, so you can switch it off in the settings

+With training off, chats keep the 30-day retention period

+Enterprise adds custom data retention controls, according to Claude's pricing page

−If you allow training, retention runs five years instead of 30 days

−Training is opt-out on consumer plans, so the privacy choice falls to you rather than to the default

Visit Claude →

Gemini

Best for: Teams on Google's business editions who want the no-training terms in writing

PricingFree; Google AI Plus $4.99/mo, Google AI Pro $19.99/mo, Google AI Ultra from $99.99/mo

+Business and Enterprise editions say prompts, outputs and training data are not used to train Google models

+All paid plans are billed monthly, and the page says you can cancel at any time

+A free tier is available with a Google account

−The subscription page does not say how personal Gemini chats are used for training, so check the privacy hub before pasting sensitive material

−The no-training promise covers the business editions, not the personal plans many buyers actually pay for

Visit Gemini →

Mistral Le Chat

Best for: Buyers who want a cheaper paid plan from a French AI company and will check its training switch

PricingFree; Pro $14.99/mo; Team $24.99 per user/mo; Enterprise by contact

+Pro costs less than Claude Pro, Google AI Pro and Venice Pro in this list

+Team is $24.99 per user a month, and the free plan lets you try the product first

+The Education plan carries the same Pro price for verified students

−The pricing table marks model training as opt-out in three plan columns but gives no instructions for switching it off

−Enterprise pricing is by contact only, so companies cannot compare it on the page

Visit Mistral Le Chat →

What it is

A private AI chatbot is a chat assistant that gives a clear answer to three questions: whether your conversations train its models, how long it keeps them, and who can decrypt or read them.

Most large assistants answer the first with a toggle you have to find, the second with a retention period that can run for years, and the third with a policy that is hard to pin down. The tools in this list answer with a default instead: no training and no logs, chats that stay on your device, or encryption that only you can open.

Why it matters

The difference shows up in the retention clause nobody reads. Claude keeps consumer chats 30 days when training is off and five years when it is on, so the same account can carry very different risk depending on one switch.

Lumo keeps history with zero-access encryption, which means the company cannot read it, while Venice's default Private mode stores no prompt or response on the strength of a contract. Choose the rule you can live with, then confirm it in the account settings, because a privacy promise behind a toggle is only as good as the toggle you remembered to set.

For raw capability, the best AI chatbots list ranks general fit first, so use it for power and this page for data rules.

Key features to look for

Training default

Whether your chats can train the model without you doing anything. Lumo says it never uses your data to train AI models, DuckDuckGo says it does not train on your data, and Brave says it does not use chats for additional model training. Claude's consumer plans are opt-out, so training stays possible until you switch it off.

Retention

How long a provider keeps a conversation. Claude keeps consumer chats 30 days with training off and five years with it on. Venice's default Private mode stores no prompt or response. Brave says it does not retain chats on its servers, and DuckDuckGo keeps recent chats only on your device.

Who can read it

Encryption decides whether the company itself can see your history. Lumo uses zero-access encryption, so not even Proton can read it. Venice's end-to-end encrypted mode on Pro means no one, including Venice, can see your data. A model you run through Ollama keeps prompts on hardware you own.

Cost of the private option

Lumo, DuckDuckGo AI Chat and Brave Leo each give you a no-training option that is either free or under $10 a month on yearly billing, so price rarely justifies accepting a weaker data rule. The paid plans from Venice and Claude cost more.

Where the model runs

Ollama runs open models on your own computer, so the prompt never goes to a company's server. You trade that for setup work and the memory your machine needs for the model you pick.

Pricing

Prices here were read on the vendor's own pages in October 2026, and all figures are in US dollars. Where a vendor shows no USD price, the entry says to check it.

Sources: Lumo, DuckDuckGo AI Chat help, the Ollama license, Venice pricing and Venice privacy page, Brave Leo, Claude pricing and Anthropic's consumer terms update, Google AI plans and Mistral pricing.

Scenario: a professional who wants a paid private chatbot for twelve months.

Lumo AI Plus comes to $119.88 on yearly billing. Le Chat Pro is $179.88 at $14.99 a month, Venice Pro is $216 at $18 a month before its yearly discount, Claude Pro is $200 on annual billing, and Google AI Pro is $239.88 at $19.99 a month.

The free tools here cost nothing in subscription fees, and Ollama's only cost is the computer you already own.

How we ranked: each chatbot is ranked first on what happens to your chats by default (training, retention and who can read them), then on how much of that protection is free and what the paid private tier costs.

Ollama would top the first test, because prompts stay on your own computer, but its hardware and setup demands put it third. Prices and data rules are as published on those pages in October 2026, and nothing on this page comes from a hands-on test.

Plan	Price	Best for
Lumo Free	Free	No credit card needed, and the company says it does not log chats
Lumo AI Plus	$9.99/mo	Yearly billing, with zero-access encrypted history and no chat logs
DuckDuckGo AI Chat	Free	Free models from Anthropic, Mistral and OpenAI, with recent chats kept on your device
Ollama	Free	MIT-licensed software that runs open models on your own hardware
Venice Pro	$18/mo	End-to-end encrypted mode, encrypted chat backup and restore, and 16.7% off yearly billing
Venice Pro Plus	$68/mo	Includes $75 a month of API spend and every Pro feature
Venice Max	$200/mo	Includes $225 a month of API spend and every Pro feature
Brave Leo Free	Free	Brave says chats are not retained on its servers or used for training, and you can save them on your device
Claude Free	Free	Training is opt-out on consumer plans, and chats are kept 30 days with training off
Claude Pro	$20/mo	$17/mo on yearly billing; five-year retention applies only if training is allowed
Claude Max	From $100/mo	Max 5x and 20x usage tiers for heavy daily use
Gemini Free	Free	Free with a Google account
Google AI Plus	$4.99/mo	Entry paid plan, billed monthly
Google AI Pro	$19.99/mo	Billed monthly and cancellable at any time; business editions have their own no-training terms
Google AI Ultra	From $99.99/mo	Five times the AI Pro usage limits, with a $199.99 tier at twenty times
Mistral Le Chat Free	Free	Limited messages, web searches and coding sessions
Le Chat Pro	$14.99/mo	Excludes taxes; same price on the Education plan for verified students
Le Chat Team	$24.99/user/mo	Team plan billed per user

Mistakes to avoid

×Assuming a paid plan keeps your chats out of training. Claude's consumer plans, Free, Pro and Max, are opt-out for model training, so paying does not change the setting.

×Comparing the Lumo price with a free tool as if they bought the same thing. The Lumo price is quoted for yearly billing, so read the billing screen before you commit.

×Reading zero-access or end-to-end encryption as a promise about the whole service. Venice's default Private mode rests on contract terms, and its Anonymous mode leaves storage to the underlying provider.

×Forgetting that local chats stay on one device. DuckDuckGo AI Chat keeps recent chats only on the device where you used it, and Brave Leo keeps saved chats there too, so a new laptop starts with an empty list.

×Pasting client or company material into a free tool before reading its retention rule. If you allow Claude to train on your chats, Anthropic keeps them for five years.

Expert tips

→Check the training setting on each account before you upload anything sensitive, and recheck it after any terms update.

→Start free with DuckDuckGo AI Chat or Brave Leo, and pay for Lumo only when you want encrypted history that nobody else can read.

→Keep Ollama for material you would never send to a company, such as unreleased contracts or source code, and use a hosted tool for everything else.

→Read the terms when they change, as Claude's did in August 2025, and treat any privacy promise as current only until the next update.

The bottom line

For most people who want a private chatbot in 2026, Lumo is the pick: no chat logs, no training on your data, zero-access encryption, and a yearly-billed paid plan at a low monthly rate.

If you want to pay nothing, DuckDuckGo AI Chat and Brave Leo keep chats out of training, and Ollama keeps prompts on your own machine if you can run it.

Claude and Gemini are the strongest assistants here, but both need you to read their training and retention rules before pasting anything sensitive.

Read the setting, not the marketing.

The same chatbot can train on your chats or not depending on one switch, so choose the default you can live with and confirm it on your account.

For the capability side, see our best AI chatbots list and the Claude review, and for prices see Claude pricing and Gemini pricing.

For a short email on AI tool prices and privacy changes, sign up for the AIpresso newsletter.

Cite this: Aipresso, "Best Private AI Chatbots in 2026," October 2026.

Frequently asked questions

What is the most private AI chatbot in 2026?

Ollama gives the strongest guarantee on this list, because prompts stay on your own machine, but it needs capable hardware. Among hosted chatbots, Lumo, from Proton, comes first: it says it does not log chats and never uses your data to train AI models, and its history is stored with zero-access encryption that not even Proton can open.

Is there a free private AI chatbot?

Yes. Lumo has a free plan that needs no credit card and says it does not log chats. DuckDuckGo AI Chat and Brave Leo are also free, and both say they do not train on your chats. DuckDuckGo keeps recent chats only on your device, and Brave says it does not retain chats on its servers. Ollama is free under the MIT license, but you need a computer with enough memory for the model you choose.

Does Claude use my chats to train its models?

On its consumer plans, Free, Pro and Max, Claude's model training is opt-out, so chats can train future models unless you switch the setting off. If you allow training, Anthropic keeps your data for five years instead of 30 days.

How much does a private AI chatbot cost?

Lumo AI Plus is $9.99 a month on yearly billing, or $119.88 a year. Mistral Le Chat Pro is $14.99 a month, Venice Pro is $18 a month, and Claude Pro is $20 a month, or less on yearly billing. Google AI Pro is $19.99 a month, while the free tiers of DuckDuckGo AI Chat, Brave Leo and Ollama cost nothing in subscription fees.

Does Gemini train on my chats?

Google's Business and Enterprise editions say prompts, outputs and training data are not used to train Google models. The subscription page does not say how personal Gemini accounts are handled, so read Google's privacy hub before pasting sensitive material.

Is Ollama really private?

Prompts sent to a model you run yourself stay on your own hardware, and the Ollama software is MIT-licensed. The trade-off is setup work and the memory your computer needs, plus the fact that output quality depends on the open model you choose.

What does Venice's Private mode promise?

Its default Private mode stores no prompt or response, a promise Venice says is enforced by contract rather than technical guarantees. Its end-to-end encrypted mode on Pro goes further, so no one, including Venice, can see your data.

Sources

Prices and plan details come from each vendor's own pricing page, re-checked by the Toolradar pricing tracker.