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Writing guide

How to choose an AI writing tool

There are dozens of AI writing tools, and most of them are built on a handful of the same underlying models. The differences that matter to you are usually not the AI itself. They are where the tool lives, what the plan limits are, and what happens to the words you type into it. This guide walks through how to choose, in about the time it takes to drink a coffee.

1. Start with the job, not the brand

AI writing tools fall into two broad groups, and picking the right group solves half the problem.

  • Chat assistants such as ChatGPT and Claude. You open a separate window, describe what you need, and get a draft back. They are flexible: emails, outlines, summaries, lesson plans, social posts, rewriting a paragraph for a different reader. The trade-off is that you copy text in and out.
  • Writing checkers that sit inside your apps such as Grammarly. They work in your browser, email and documents, flag problems as you type, and offer rewrites in place. They are less flexible for "write me a first draft," but they fit into work you are already doing.

Ask yourself: do I mostly need a first draft, or do I mostly need my own writing to be clearer and correct? Many people end up using one of each.

2. Run a fair test on the free tier

Every tool on our writing shortlist has a free plan, so there is no reason to pay before you have tried it on your own work. A fair test looks like this:

  1. Pick two or three real tasks you do every week. For example: reply to a tricky email, turn meeting notes into a summary, rewrite a paragraph for a younger reader.
  2. Give each tool the same instructions and the same source text. Change one thing at a time so you can compare.
  3. Judge the result on what you would actually send: Is it accurate? Does it sound like you? How much did you have to fix?
  4. Try a follow-up ("make it shorter," "less formal," "add a clear next step"). A tool that handles revisions well saves more time than one with a flashy first draft.

Leave out anything private while you test. Use a made-up email or a public document instead of real names, grades or customer details.

3. Read the limits before you rely on it

Free plans are generous for trying a tool and stingy for daily use. The limits are usually listed on the pricing page, if you know what to look for:

  • Usage caps. Claude's plans, for example, have usage limits that reset every five hours and every week. Grammarly's free plan includes 100 AI prompts a month. These are fine for occasional use and frustrating on a deadline.
  • Model access. Paid tiers often unlock stronger or newer models. The free version may be good enough for emails and weaker for long reports.
  • File uploads and length. If you want to drop in a 30-page PDF and get a summary, check that the plan allows uploads and long documents.
  • Billing terms. As of November 2026, OpenAI says ChatGPT Plus is billed monthly only, while Claude Pro can be paid monthly or annually at a lower monthly rate. Annual plans save money only if you are sure you will keep using the tool.

Prices change often. We list current pricing facts, with the date we checked them, on the AI Tools page.

4. Check what happens to your words

This is the step most people skip. Before you paste in anything that matters, find three answers on the vendor's own pages:

  • Is my content used to train the AI? Some consumer plans use your conversations to improve models unless you opt out. OpenAI, for example, says you can opt out in ChatGPT's Data Controls. Business and education plans often switch training off by default.
  • How long is it kept, and can I delete it? Look for a retention policy and a clear way to delete your history.
  • Who else can see it? On a work or school account, your administrator may have access to your chats.

A simple rule: if you would not paste it into an email to a stranger, do not paste it into a consumer AI tool. That includes student records, health details, passwords and anything under a confidentiality agreement. If you need AI for that kind of material, ask whether your employer or school has an approved business or education plan.

5. Make sure it fits where you write

The best tool is the one you will actually open. Check whether it works where you spend your day:

  • Is there a browser extension, desktop app or phone app?
  • Does it work inside Google Docs, Microsoft Word or Outlook, or do you have to copy and paste?
  • Can it read files you already have, or connect to your drive?

6. Keep your judgment switched on

AI writing tools produce fluent text, and fluent text sounds right even when it is wrong. They can invent facts, quotes, statistics and sources with complete confidence. Treat every draft as a starting point:

  • Check any fact, number, date or name before you send it.
  • Never publish a citation you have not opened yourself.
  • Read the draft out loud. If it does not sound like you, edit it until it does.
  • Follow your school's or employer's rules on disclosing AI help.

Quick checklist

  • I know whether I need a chat assistant, an in-app checker, or both.
  • I tested the free tier on two or three real (but non-sensitive) tasks.
  • I know the plan's usage limits and billing terms.
  • I found the vendor's answer on training, retention and deletion.
  • It works in the apps where I actually write.
  • I have a habit of fact-checking before I hit send.

Ready to compare? See our writing shortlist or the side-by-side ChatGPT vs Claude page.

Last checked November 3, 2026.