The short answer
Yes — you can use AI for free, and seriously so, not just to try it out. ChatGPT, Claude, Gemini and Perplexity all have a free tier that needs no credit card and does not expire after fourteen days. For a large part of what you do day to day, that is enough.
The limit is not where most people suspect it. Not in the quality of the answers — but in volume, attachments and the strongest model. Exactly where, is below.
What changed this month
Almost all the overviews you find in a search are out of date on one point — including the ones that rank high: two of the most-clicked German articles on this topic date from October 2025 and February 2025.
Since the week of 10 August 2026, OpenAI is lifting the message limit for free ChatGPT accounts — for pure text chats. Before, it was around ten chats in five hours. That is the biggest change in the free tier in a long time.
But read closely: “Unlimited” applies to text. As soon as you upload a file, have an image processed or use tools, limits still apply. That is exactly what the headlines leave out.
What you actually get done for free
Not in the abstract, but the things that genuinely sit on a self-employed person’s desk:
- Drafting and reworking offer copy and service descriptions
- Boiling a long email down to three polite sentences
- Pulling the tasks out of meeting minutes
- Structuring a blog text before you write it
- Sorting numbers and asking what stands out about them
- Having a difficult reply to a client phrased three different ways
- Researching — with sources cited, if you take Perplexity
That is not a small list. That is the largest part of a week’s desk work.
The four limits you run into
Free tiers differ in detail, but the limits are the same four at every provider. If you know them, you also know when a subscription is due — and when not.
1. The volume. Almost everywhere a rolling time window runs, usually five hours. With Claude that is roughly fifteen to forty messages, depending on how long yours are. It does not reset at midnight but five hours after your first message. If you work intensively in the morning, you hit the wall at noon.
2. The attachments. This is where it gets uncomfortable for the self-employed, because this is where the real work sits. Perplexity lets you upload three files a day for free, each up to five megabytes. A set of annual accounts as a PDF is already borderline. And at ChatGPT the upload limits remain, even though text chat is now open.
3. The strongest model. Every provider reserves its best model for paying customers. With Claude you get the middle tier for free — good enough for almost everything, but not what the news is written about. With Perplexity you cannot even choose which model does the work on the free tier.
4. Priority under load. The most invisible point. When there is a rush, paying accounts are served first. You do not notice it as an error message but in things getting sluggish — precisely when everyone is working.
The overview, as of August 2026
| Provider | What works for free | Where it stops |
|---|---|---|
| ChatGPT | Text chats without a message limit since 10 Aug 2026 | Uploads, images and tools still limited |
| Claude | Rolling 5-hour window, file uploads, web search, projects | Strongest model only on subscription, priority for payers |
| Gemini | Free to use, tightly interlocked with Google | App, AI Studio and search have different limits |
| Perplexity | Basic searches practically unlimited, with sources cited | 3 Pro searches a day, 3 files at 5 MB, no model choice |
Numbers in this field age fast. If you are reading this in six months, the table is probably no longer accurate — the four limits above it still are.
The mistake almost everyone makes
Anyone searching “use AI for free” lands on lists with forty tools. And then sets up accounts at five of them, because each has an advantage somewhere.
That is the most expensive mistake in the free tier — expensive not in money but in time. Five tools you know superficially are worth less than one you can handle properly. Because the difference between a usable and a useless result almost never lies in the tool. It lies in how precisely you describe what you want — and that only partly transfers from one provider to the next.
On top of that: with five accounts you spread your free allowances across five places and hit the limit everywhere, instead of getting really far in one place.
My suggestion: four weeks, one tool
Take one. Which one matters less than the comparison articles suggest — but as a guide:
- Lots of text and long documents: Claude
- Research where you want to see the source: Perplexity
- Everything around Google documents: Gemini
- Widest adoption, plenty of material to look things up: ChatGPT
And then, for four weeks, put every task that lends itself to it through this one tool. Not because the others are bad, but because in four weeks you develop a feel for how you have to ask. That feel is the real gain — and it costs nothing.
After four weeks you also know something no comparison table can tell you: whether you hit the limit at all. Many never do. Then you have saved yourself a subscription you would otherwise have taken out just in case.
When a subscription is genuinely due
There are exactly three occasions, and you recognise all three by them hitting you repeatedly — not once:
- You regularly reach the limit in the middle of work, not at the edge
- You constantly work with documents beyond the upload limits
- You demonstrably need the strongest model — which is the case less often than the marketing copy suggests
If one of these three applies to you, a subscription almost always pays for itself immediately. What Claude costs in detail and which tier is meant for what, I have written up here: What does Claude cost?
And if none applies: Stay free. There is no prize for paying early.
The point this is actually about
“Using AI for free” sounds like a money question. But it is not one. Fifteen euros a month is not the hurdle for any business.
The real hurdle is that most people never get around to using the tool seriously — because they jump between five providers, try a new one every week and never truly hand over a task. Whoever starts free and sticks with it gets further than someone who pays and collects.
Start with one single task that annoys you every week. Not with a tool comparison.
And if you would rather not experiment alone: That is exactly what we talk about in my free community “KI — aber richtig” — the templates and workflows from my videos live there too, and you can see what other solopreneurs started with. And if you want company along the way: the AI Business Community offers monthly live calls, workshops and the MACHZEIT! challenge for exactly that.
Frequently asked questions
Which AI is the best for free?
There is none that is best for everyone — and that is not an excuse but the heart of the matter. For long texts and extensive documents, Claude is strongest for free; for research with visible sources, Perplexity; for everything around Google documents, Gemini; and ChatGPT has had no message limit on text chats since 10 August 2026. More important than the choice is that you stick with one: a tool you lead well beats five you know superficially.
Which ChatGPT is free?
The standard version at chatgpt.com is free and usable without a credit card. Since the week of 10 August 2026 there is no message limit there for pure text chats — before, it was around ten chats in five hours. Important: limits still apply to file uploads, image processing and additional tools. The strongest models and higher allowances remain reserved for ChatGPT Plus.
Which AI apps are free?
ChatGPT, Claude, Gemini and Perplexity all have free apps for iPhone and Android, plus desktop programs for Mac and Windows. The app costs nothing extra — the same limits apply as in the browser, because they are tied to the account, not the device. On the installation routes for Claude I have a separate article: Claude app and download.
Which AI is free without signing up?
Without any sign-up, Perplexity comes closest: basic searches can be started right in the browser. At the big providers you need a free account for serious work — not as a business model, but because without an account no history is saved. And it is precisely the history that is valuable when work spans several days. I would advise against imitations like “ChatGPT German without sign-up”: it is rarely traceable who reads your input there.
Is the free version enough for my business?
For the largest part of desk work, yes: drafting and shortening texts, summarising emails, evaluating minutes, building structures, playing through phrasings. You typically only hit the limit when you work with larger documents daily or stay in one thread for several hours at a stretch. Test it for four weeks before you pay — many never hit the limit.
What happens when I reach the free limit?
Nothing dramatic: you get a notice and can continue once the time window has passed. At most providers a rolling five-hour window runs — so it does not reset at midnight but five hours after your first message. If you use the morning intensively, you are back on in the early afternoon.
When is switching to a paid subscription worth it?
On three occasions, and all three have to hit you repeatedly: you regularly reach the limit in the middle of work, you constantly work with documents beyond the upload limits, or you demonstrably need the strongest model. If none applies, there is no reason to pay. The prices for Claude are in the article “What does Claude cost?”.
