Guides · Updated 2026-10-27

ChatGPT vs Gemini vs Copilot for Small Business: Which Free AI Assistant Should You Use?

ChatGPT, Google Gemini and Microsoft Copilot are the three AI assistants most small-business owners try first, and all three have a free version. They can all draft emails and quotes, summarise long documents, brainstorm marketing ideas and answer "how do I…" questions. The real differences for a small business are less about which one is "smartest" this month and more about which apps you already use, what the free limits feel like day to day and how each one handles your data. This guide compares them for owners, not for tech reviewers, and gives you prompts to test them on your own work in under an hour.

Short answer: for most small businesses any of the three is good enough for everyday writing and planning, so pick the one that matches the software you already live in. If your business runs on Gmail and Google Docs, start with Gemini. If it runs on Outlook, Word and Excel, start with Copilot. If you don't mind either way, or you want the most widely used general assistant, start with ChatGPT. Use the free version for two weeks on real tasks, change the privacy settings below on day one, and only pay when a limit gets in your way on something you do every week.

Plans, limits, model names and settings change often. Everything below was checked on the official pages in October 2026; check the current page before you buy anything. This guide is general information, not legal or data-protection advice.

The comparison at a glance

Sources: ChatGPT's official pricing page (chatgpt.com/pricing) and OpenAI's Help Center article "Data controls in ChatGPT"; Google's Gemini subscriptions page, Gemini Apps Privacy Hub and Google Workspace pricing; Microsoft's Copilot for small business page and Copilot for individuals privacy page. All checked October 2026.

What actually matters for a small business

Ignore benchmark charts. For an owner, five things decide which assistant is worth your time:

1. Where your work already lives. The biggest time-saver is AI that can see your email and documents without copy-and-paste. Gemini does that best inside Google's apps and Copilot inside Microsoft's, but in both cases that's a paid feature. On the free versions you'll copy and paste whichever you choose.
2. The free limits on your real tasks. All three are generous for short text chats. Limits show up when you upload files, create images, use voice or run "deep research" reports. Try your heaviest weekly task on each before deciding.
3. Privacy settings. ChatGPT and Gemini have a setting that controls whether your chats help train their AI and a temporary chat option; Copilot has its own privacy controls. Change them before you paste anything about customers (see below).
4. Team use. If more than one person will use AI for work, a business plan gives you admin control and business data terms. Personal accounts shared between staff are a bad idea.
5. Accuracy. All three can state wrong facts confidently. Google's privacy hub warns Gemini can produce inaccurate information, and Microsoft tells users to double-check Copilot's facts and citations. You check every price, date, name and legal point.

Task-by-task recommendations

Test them yourself: 10 copy-paste prompts

The fastest way to choose is to give all three the same real task and compare the answers side by side. Open each assistant in a separate browser tab, paste the same prompt, and score each answer from 1 to 5 for accuracy, tone and how much you had to fix. Replace anything in [brackets] and remove customer names first.

1. Business brief (use this first in each tool): "I run [type of business] in [town/area, country] with [number] staff. We sell [main products/services] to [type of customer], usually at [price range]. Our tone is [friendly and plain / professional]. Over the next few questions, help me with everyday admin and marketing. Don't invent facts, prices or policies; ask me if you need a detail."
2. Customer email: "Write a polite reply to this customer enquiry, under 120 words, answering their question and suggesting a next step: [paste enquiry with name removed]. Our answer is [the facts]."
3. Quote follow-up: "Write a short, friendly follow-up for a quote we sent [number] days ago for [job]. Don't be pushy. Offer to answer questions and give a clear way to accept."
4. Social post: "Write 3 versions of a Facebook and Instagram post about [offer/news], under 80 words each, in our tone, with one clear call to action. No hashtags in the first line."
5. Summarise a document: "Summarise the attached [supplier terms / lease / policy] in plain English: the 5 points that matter most for a small business, any dates or deadlines, and any costs or penalties. Quote the exact wording for anything important."
6. Pricing maths: "Our cost for [product/service] is [cost], we want a [X]% gross margin, and competitors charge [range]. Show the calculation for our minimum price step by step, then suggest 3 price points with the pros and cons of each."
7. Spreadsheet help: "Here is a table of last month's sales: [paste table with no customer names]. Which 3 products or services made the most money, which made the least, and what's one simple action for next month? Show your working."
8. Research with sources: "What are the most common questions customers ask before buying [product/service] from a small business in [country]? Give 10 questions and link a source for each where you can."
9. Plan the week: "Here are my tasks for the week: [list]. Sort them into must-do, should-do and can-wait, and suggest a realistic plan for [number] hours of admin time."
10. Check itself: "Review your last answer. List any facts, numbers or claims I should double-check, and anything you assumed."

Prompt 10 is worth using in every tool, every time something matters. The best assistant for you is the one whose answers you edit least on the tasks you do most.

Privacy and data: change these settings first

Whatever you choose, follow one rule: don't paste anything into a free AI tool that you wouldn't be comfortable with the company storing or a reviewer reading, such as customers' ID numbers, bank details, health information, passwords or confidential contracts. Remove names and identifying details first. Then change these settings (checked October 2026):

• ChatGPT: OpenAI's Help Center says data sharing is on by default for personal ChatGPT Free, Plus and Pro accounts. Go to Settings > Data controls and turn off "Improve the model for everyone" so new chats aren't used to train its models; your chat history stays. Temporary chats don't appear in history, aren't used to train models and may be kept for up to 30 days for safety. OpenAI says it doesn't use content from ChatGPT Business or Enterprise workspaces to train its models by default. Note that giving feedback (thumbs up or down) can allow that whole conversation to be used for training.
• Google Gemini: Google's Gemini Apps Privacy Hub says that with Keep Activity on, your chats are used to improve Google's services, including training AI models, and a subset is read by human reviewers (reviewed chats are kept for up to three years, disconnected from your account). Turn Keep Activity off, or use temporary chats, and future chats aren't used to train its models; they're still kept for 72 hours to respond and keep the service safe. Activity auto-deletes after 18 months by default, which you can change. Google also advises not to enter confidential information you wouldn't want a reviewer to see. If you use a Google Workspace work account, different business data terms apply; Google's Workspace pricing page says your company data in Gemini is not used to train models.
• Microsoft Copilot: Microsoft's Copilot for individuals privacy page covers the new Copilot app released in August 2026, and Microsoft says prompts, responses and file contents in that app aren't used to train its foundation models. Review the memory, chat history and personalised ads controls in Copilot's privacy settings. With a work account on a Microsoft 365 business plan, Microsoft's Copilot for small business page says enterprise data protection applies and prompts and responses aren't used to train the underlying models.

If your staff use AI for customer work, a business plan with proper data terms is usually worth it before anyone pastes customer information. Mention your use of AI tools in your privacy policy, and follow your country's data protection law (for example, POPIA in South Africa, UK GDPR in the UK). Our guide is ChatGPT safe for customer data? has a what-never-to-paste table, an anonymisation method and a one-page staff AI policy.

Free vs paid: when to upgrade

Stay free while you're learning. Upgrade only when one of these is true:

• You hit the same limit every week on a task that saves you real time (file uploads, images, voice or research reports).
• You want AI inside your email and documents. That means a paid Google AI or Google Workspace plan for Gemini in Gmail and Docs, or a Microsoft 365 plan with Copilot for Word, Excel and Outlook.
• More than one person uses AI for work. Move to a business plan (ChatGPT Business, Google Workspace, or Microsoft 365 with Copilot) so the business controls the accounts and the data terms cover business use.
• You want scheduled AI employees instead of a manual chat box. Grok Bot lets you build specialised AI employee bots that keep their own role memory, work on a shared cloud computer (each with its own screen and browser), sign in with Vault or 1Password, use Gmail/Calendar/Drive connectors, build Pages dashboards and run scheduled or event-driven routines that draft emails and reports for your approval. Those routines depend on configured access, approvals, usage and service availability, and are not guaranteed always-on. Check current Grok Bot plans and availability. See how to hire AI employees for your small business with Grok Bot.

Prices vary by country and change often, and some plans have introductory offers or usage-based charges, so compare the official pricing pages on the day you buy and check the renewal price, not just the first month.

A one-hour way to choose

1. Set up all three free accounts and change the privacy settings above (15 minutes).
2. Paste prompt 1, then prompts 2 to 7 into each tool, using a real task from this week (30 minutes).
3. Score each answer for accuracy, tone and editing needed, and note any limit you hit (10 minutes).
4. Pick one for daily use and save your business brief in it (5 minutes). Re-check your choice in three months; these tools change fast.

Frequently asked questions

Which is better for small business: ChatGPT, Gemini or Copilot?

There is no single winner. For everyday writing and planning all three are good enough, so choose the one that fits your software: Gemini for Gmail and Google Docs users, Copilot for Outlook, Word and Excel users, and ChatGPT if you want a general assistant regardless of software. Test all three on the same real task and keep the one you edit least.

Are ChatGPT, Gemini and Copilot free?

Yes, all three have a free version (checked October 2026). The free versions handle everyday text chats well but limit heavier features such as file uploads, image creation, voice and deep research. AI built into Gmail, Google Docs, Word, Excel or Outlook needs a paid plan. Free limits change often, so check the official pricing pages.

Is it safe to put customer information into ChatGPT, Gemini or Copilot?

Be careful. On personal accounts, ChatGPT and Gemini can use your chats to improve their AI unless you change the settings, and Google says some Gemini chats are read by human reviewers. Remove names and identifying details, never paste ID numbers, bank details, health information or passwords, turn off training in settings, and use a business plan with proper data terms if staff handle customer data.

Do ChatGPT, Gemini and Copilot use my chats to train their AI?

It depends on the tool and the account. OpenAI says personal ChatGPT accounts share data for training by default until you turn off "Improve the model for everyone", while Business workspaces aren't used by default. Google says Gemini uses chats for training while Keep Activity is on. Microsoft says prompts and files in the new Copilot app aren't used to train its foundation models. Business plans from all three have stricter data terms.

Can I use more than one AI assistant?

Yes. Many owners use one as their daily assistant and another for a second opinion on important drafts, or use Copilot or Gemini inside their office apps and ChatGPT for brainstorming. Keep one main tool for saved instructions and history so you don't repeat your business details everywhere.

Should I pay for ChatGPT Plus, Google AI Pro or Microsoft 365 with Copilot?

Only when a free limit slows down a task you do every week, or when you want AI inside your email and documents. If more than one person will use it for work, look at the business plans instead of personal ones. Compare current prices on the official pages, since they vary by country and change often.

More help getting started: read our step-by-step guide to using ChatGPT for small business (the prompt formula works in Gemini and Copilot too) and our best free AI tools for small business shortlist. Then put your chosen assistant to work with AI invoice reminder templates, WhatsApp Business quick replies and our AI social media plan for small business.

Get a personalised AI plan for your business free: take the 2-minute quiz.