Best AI assistants for $10 a month or less

Updated 23 Oct 2026 · Prices from vendor pages only · How we rank →

The short answer

Every tool here has a paid plan listed at $10 a month or less on its vendor's pricing page. ChatGPT comes first: the broadest general assistant: a usable free plan, apps on every major platform and a ladder of paid plans for heavier use. The cheapest verified paid plan here is Google Gemini Google AI Plus ($4.99/month). 4 of the 4 have a free plan we could confirm. Every price below is from the vendor’s own page, checked 19–23 Oct 2026.

Ranked shortlist

ChatGPT: The broadest general assistant: a usable free plan, apps on every major platform and a ladder of paid plans for heavier use. Plan: Go: $8/month
More messages, uploads and image creation; limited Codex; may include ads
Google Gemini: Low-cost entry tier and deep ties to Google storage, Search and creative tools. Plan: Google AI Plus: $4.99/month
2x Free usage
Grok: Fast-moving assistant bundled with X plans and Cursor, with image and video generation built in. Plan: Plus: $8/month
Shared AI usage pool; Grok Chat, Voice, Imagine and Build; Grok API access; X Premium checkmark
Lumo (Proton): A free plan with no card, chats never used for training, and Plus under $10 a month billed yearly. Plan: Lumo Plus: $12.99/month billed monthly; $9.99/month billed yearly ($119.88 every 12 months)
More Max model usage, unlimited Projects

Order follows ToolRank’s editorial ranking in AI Assistants, filtered to tools that fit this page. Anything we couldn’t confirm on a vendor page says “Not yet verified”.

Side by side

Rank	Tool	Relevant plan	Starting price	Free plan	Best for	Main limitation	Last checked
#1	ChatGPT	Go: $8/month More messages, uploads and image creation; limited Codex; may include ads	$8/month (Go)	Free plan: unlimited* everyday text chats, limited messages with uploads (vendor footnotes apply)	Everyday drafting, Q&A and file analysis across web and mobile	The free plan gets only the lighter model and limited uploads; top models need Plus or Pro.	19 Oct 2026
#2	Google Gemini	Google AI Plus: $4.99/month 2x Free usage	$4.99/month (Google AI Plus)	$0/month with a Google Account (Flash-Lite model, base usage limits)	People already in Google's ecosystem (Gmail, Drive, Photos)	Higher usage limits and the top model sit behind AI Pro ($19.99/month) or Ultra ($99.99+/month).	19 Oct 2026
#3	Grok	Plus: $8/month Shared AI usage pool; Grok Chat, Voice, Imagine and Build; Grok API access; X Premium checkmark	$8/month (Plus)	Free: $0/month, limited chat and agent requests	X users who want real-time context plus image/video generation	The Free plan has limited requests; the latest models, Grok Bot and 4x usage need Premium ($30/month) or above	19 Oct 2026
#4	Lumo (Proton)	Lumo Plus: $12.99/month billed monthly; $9.99/month billed yearly ($119.88 every 12 months) More Max model usage, unlimited Projects	$9.99/month (Plus, billed yearly)	Free plan: limited messages, Max model use and image generations, no credit card	People who want a ChatGPT-style assistant with strong privacy	Free plan limits messages and Max model use; Business plan price not shown	23 Oct 2026

Prices as listed by each vendor on the last-checked date, USD, before tax. Plans and limits change, so follow the sources below.

Who should pick which

Pick ChatGPT for everyday drafting, Q&A and file analysis across web and mobile (Go: $8/month); think twice if you need guaranteed access to the strongest models without paying. Pick Google Gemini for people already in Google's ecosystem (Gmail, Drive, Photos) (Google AI Plus: $4.99/month); think twice if you don't use Google services and want a standalone assistant. Pick Grok for x users who want real-time context plus image/video generation (Plus: $8/month); think twice if you want a clearly documented free usage allowance. Pick Lumo (Proton) for people who want a ChatGPT-style assistant with strong privacy (Lumo Plus: $12.99/month billed monthly; $9.99/month billed yearly ($119.88 every 12 months)). Watch out: free plan limits messages and Max model use; Business plan price not shown.

FAQ

Which of these is cheapest?

Google Gemini Google AI Plus ($4.99/month) is the lowest paid price we verified on this list (https://gemini.google/subscriptions/, checked 19 Oct 2026). Check the vendor page for tax, billing period and usage limits.

Which of these have a free plan?

ChatGPT: Free plan: unlimited* everyday text chats, limited messages with uploads (vendor footnotes apply); Google Gemini: $0/month with a Google Account (Flash-Lite model, base usage limits); Grok: Free: $0/month, limited chat and agent requests; Lumo (Proton): Free plan: limited messages, Max model use and image generations, no credit card.

How were these tools chosen?

They are the tools in ToolRank's rankings with a verified paid plan at or below $10/month (USD), confirmed on the vendor's own website on 19–23 Oct 2026. Tools we could not verify are left out rather than guessed, and anything unconfirmed is marked Not yet verified.

Sources

ChatGPT: ChatGPT and Codex plan prices (OpenAI docs) checked 19 Oct 2026
ChatGPT: ChatGPT pricing (plan features) checked 19 Oct 2026
ChatGPT: Download ChatGPT (desktop and mobile) checked 19 Oct 2026
Google Gemini: Google AI plans checked 19 Oct 2026
Google Gemini: Gemini for desktop checked 19 Oct 2026
Grok: Grok pricing (xAI) checked 19 Oct 2026
Grok: Grok product page checked 19 Oct 2026
Lumo (Proton): Lumo pricing and FAQ checked 23 Oct 2026
Lumo (Proton): About Lumo checked 23 Oct 2026

Related comparisons

All comparisons →

Profiles: ChatGPT · Google Gemini · Grok · Lumo (Proton)

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