Almost every AI tool answers in Czech now. You won’t see the difference between them in the chat window. You’ll see it in the text that has to go out: an email to a client, a product description, an article for your website. That’s where it shows whether a tool actually writes Czech or just turns English into Czech words.
I hear this in consultations over and over. A company buys a subscription, has a text written, and then rewrites the whole thing anyway. The lesson it takes away is that AI just can’t do Czech. But all it did was put the tool on the one job that particular tool is least suited for.
The Czech gives itself away in paragraph three
Every one of these tools handles the first paragraph. The difference shows up in a longer text, where the tool has to make decisions about word order and sentence rhythm. That’s exactly where one sticks to Czech sentence structure and another slides back to English. And if the text is then read aloud in your own voice, you can suddenly hear every one of those sentences.
The table lists the seven tools people reach for most often when writing. I read the prices from the official pricing pages on September 19, 2026. Where I couldn’t read the pricing firsthand, I leave the number out, because a guessed number is worse than none.
Seven writing tools and their Czech
| Tool | What I use it for | Czech | Price as of Sept. 19, 2026 | Where it falls short |
|---|---|---|---|---|
| Claude | long text built on your own materials | least rewriting | Pro $20 a month, $17 billed annually | hourly usage limits, even on paid plans |
| ChatGPT | ideas, outlines, broad range | fluent, but drags in English phrasing | unverified | always go over its text |
| Google Gemini | writing right inside Gmail and Docs | fluent | unverified | price hidden inside a bundle |
| Jasper | marketing templates and brand voice | weaker than the big three | Pro $69 per seat, $59 billed annually | no free plan at all |
| Perplexity | writing with links to sources | fluent | unverified | citations may not match the source |
| DeepL | translating finished text | very good | 50,000 characters free, then from €7.49 | translates, but doesn’t write |
| Grammarly | proofreading English text | no Czech | unverified | useless for Czech text |
Translationese Czech
Text that uses the right Czech words but English sentence structure. You can spot it by the passive voice, long compound sentences, nouns where verbs belong, and conjunctions nobody uses in spoken Czech. Nothing is missing from the meaning. What’s missing is that anyone would say it that way out loud.
“It reads nicely. But nobody here talks like that.”
That’s what the owner of an online store told me about a product description AI had written for her on the first try. She had no objection to the content. Her objection was that the text didn’t sound like her company.
Claude: the best Czech for long texts
Claude is the tool that leaves me the least rewriting. It holds Czech word order well and can handle a long source document for the text to be built from.
Best for: an article, a proposal, or a longer email that draws on your own materials and should go out almost unedited.
In practice, you give it a call transcript, an older version of the text, and a few notes, and you get coherent Czech text back. The more of your own material you give it, the less it makes up. Most of my work with texts rests on exactly that: teaching AI to write in your voice.
Where it falls short: even on paid plans, you hit hourly usage limits right when you’re on a roll.
Price as of September 19, 2026: there’s a free plan. Pro costs $20 a month, or $17 a month billed annually. Max starts at $100, and a team license costs $25 per seat.
ChatGPT: the widest range, but go over its text
ChatGPT is the most widely used tool and has the biggest ecosystem around it. It answers in fluent Czech, but it drags English phrasing into its sentences without noticing.
Best for: ideas, outlines, headline variants, and anything where speed matters more than the final form.
In practice, it gives you a handful of ideas in moments, plus an image and voice in the same window. That’s its biggest strength, and for many people it’s enough on its own.
Where it falls short: finished Czech text from it almost always needs one more pass. Skip that pass, and readers will notice.
Price as of September 19, 2026: not listed. I didn’t read the official pricing page, and a guessed number doesn’t belong here.
Google Gemini: it writes where your text already lives
Gemini has one advantage the others don’t: it sits right inside Gmail, Docs, and Drive. So the text takes shape right inside your materials instead of next to them.
Best for: a business that lives in Google’s world and wants to write on top of materials that have been sitting there for years.
In practice, you write a reply to an email without switching windows and get a summary of the document you have open. The window-switching you save often adds up to more than the writing itself.
Where it falls short: the price is baked into Google’s bundles, so it’s hard to compare with the others.
Price as of September 19, 2026: not listed, for the same reason. You can’t read a rate for the writing alone off the pricing page.
Jasper: templates and brand voice at an add-on price
Jasper sits on top of the big models rather than competing with them. What it sells is marketing templates and brand-voice control. Better language isn’t part of the package.
Best for: a marketing team churning out campaign copy that needs to sound the same no matter who writes it.
In practice, you get campaign structure and a consistent tone. But its Czech is weaker than the big three’s, and that shows in Czech copy that goes out. If what you mostly need is volume and regularity, you’re better off with content that comes out on a schedule by itself while you just approve it.
Where it falls short: there’s no free plan at all, just a seven-day trial. So you pay more for the add-on than for the model underneath it.
Price as of September 19, 2026: Pro costs $69 a month per seat, or $59 billed annually. The Business plan is available on request.
Post-editing
The last human layer over machine text before it goes out. In translation, it’s a normal part of the job, not a sign the machine failed. The same goes for AI text: the tool delivers a rough version, and post-editing decides whether the reader can tell who wrote it.
One-minute self-test
Take the last text AI wrote for you and read it aloud. Watch for five things: sentences running over three lines, the passive voice (“it was decided”), nouns where verbs belong (“the carrying out of a check”), dashes in the middle of sentences, and openers like “in this day and age.” Every hit is a spot where a reader will recognize a machine.
Perplexity: it writes with links you need to verify
Perplexity mixes writing with search and offers a source for every claim. For research-based text, it’s the fastest way to get your first material together.
Best for: text that rests on outside numbers and data and has to be traceable.
In practice, you get paragraphs with links you can click through. This is exactly the kind of work where it pays most to have your own verified library of sources, because then you don’t depend on whatever the search engine happens to serve up.
Where it falls short: the link is attached, but sometimes the source doesn’t say exactly what the citation claims. You have to check both, the text and the source.
Price as of September 19, 2026: not listed. I couldn’t read the pricing from an official source.
DeepL and Grammarly: helpers, not authors
These two keep showing up in roundups of writing tools, yet neither one writes a text. DeepL translates, and Grammarly corrects. The original sentences have to come from somewhere else.
Best for: DeepL for turning finished Czech text into another language. Grammarly for proofreading English text you send abroad.
With Grammarly, one thing settles it: it doesn’t do Czech. It won’t help you with a Czech website, email, or product description, no matter what you pay.
DeepL, on the other hand, is very good in Czech, and the free version covers everyday use. Just keep in mind that it carries over an idea someone already had.
Price as of September 19, 2026: DeepL gives you 50,000 characters a month for free. The Individual plan costs €7.49 a month billed annually, and Team costs €24.99 per user. I didn’t verify Grammarly’s pricing.
How I choose
I pick tools by how much work they leave behind, never by which one is the “smartest.” For text that goes out under my name, I care about one number: how many more minutes I’ll spend on it. A tool that writes in ten seconds and then takes twenty minutes of rewriting costs more than one that takes a minute and needs two sentences fixed.
Who gets nothing from this list
One group gains nothing here. If you write one email a month and otherwise talk to customers in person, no subscription will pay off for you. The free version is plenty.
The second group is people with a distinct style of their own who like writing and write fast. For them, AI often just averages the text out. It makes more sense for them to flip the whole process and dictate the text first, because a spoken sentence tends to be livelier than one a model came up with. AI then only tidies up instead of writing.
The whole lineup in a nutshell
- For long Czech text that goes out, use Claude: it leaves you the least work.
- For ideas and quick variants, open ChatGPT, and plan on going over the text yourself.
- If you live in Gmail and Docs, try Gemini first. You’ll save yourself the window-switching.
- For translating finished text, reach for DeepL; for proofreading English, Grammarly.
- Always do the last pass yourself. Reading aloud finds more mistakes than any check.
The product description from the beginning wasn’t badly written. It just sounded like a stranger wrote it. The real test of a writing tool is how much of its text you leave untouched after reading it aloud. How fast it delivers tells you very little.
