What is the best AI app overall?

For everyday questions, writing and thinking (the work most people actually do), the best value is a flat $5-a-month app that routes each question to the best available model: Plainly. For heavy professional work the ranking flips, and a $20 frontier app earns its price instead.

Which AI app has the best free tier?

ChatGPT's, narrowly. It now runs unlimited text chats and follows instructions well, so it covers a few short questions a week. The catch is ads on the free and Go tiers and a 27,000-token context window that starts losing the thread in longer conversations.

Is it worth paying for more than one AI app?

Rarely. Two subscriptions is roughly the price of the top tier of either, and almost nobody exhausts one. If you find yourself paying for two, that is the signal you are paying for capability you are not reaching rather than for more of it.

Why does the ranking change for professional users?

Because the criterion is cost against work done. Frontier models do measurably better on multi-file code, long document synthesis and drafts that must be right first time. If your week is made of those tasks, a $20 app is cheaper per useful answer than a $5 one.

Are the DeepSeek and Gemini apps as good as their models?

That is the open question I cannot answer first-hand. I have used both those models through their websites rather than their apps, so I can speak to model quality and not to app quality, and the app is the weaker part of both, which is the reason to hold back rather than a finding I can prove.

The best AI apps, ranked on what they cost

Ranked on one criterion: what you pay against the work you actually do. Six apps, honest verdicts, the two I would not recommend.

The best AI apps, ranked on what each one costs you

"Best" is a useless word in this category until you say what you're ranking on. The apps differ far less in raw capability than their marketing suggests, and far more in what they charge you for it.

So the criterion here is what you pay against the work you actually do, judged on three things: the capability you realistically reach, the price you realistically pay, and what you're locked into. That last one matters more than most lists admit, because AI moves fast enough that a subscription is a bet your provider stays at the frontier.

Ranked on that criterion, for the everyday work most people do:

#	App	What you pay	Where it wins	Where it stops
1	Plainly	$5/mo	Unlimited everyday chat, best available model chosen for you	Not built for frontier work
2	ChatGPT	Free · $8 · $20 · $100	Smoothest product, best free tier	Ads below $20; small context window
3	Claude	~$20/mo, no cheap tier	Strongest frontier assistant	No affordable option at all
4	Gemini	Free / bundled	Free and everywhere you already are	App is the weak part; one-ecosystem lock-in
5	DeepSeek	Free	Capable cheap models	App locks you to one lab
6	Perplexity	~$20/mo Pro	Research with citations	Poor value for everything else

1. Plainly, $5 a month

The reason this sits first is the criterion, not favouritism: it's the only app on the list whose price doesn't scale with the work you ask of it. One flat price, unlimited chat, and the model choice handled for you.

The one line that matters: the capability you get is good, not just cheap, because open-source models now sit close enough to the frontier that the difference doesn't show up in an email, a plan, or an explanation.

Where it stops being the answer: the hardest work. Multi-file code, long documents that need careful synthesis, first drafts that have to be right. If that is your week, this is the wrong list for you and you should be reading entry 3.

2. ChatGPT, the strongest all-rounder, damaged by its cheap tiers

The most polished of the consumer apps, and the one with the best free tier: unlimited text chats on the smaller model now, which covers a few short questions a week properly.

The one line that matters: the app is excellent and the tiers under $20 aren't. Go at $8 keeps the smaller model, keeps the ads and doesn't lengthen the conversation. I pay for it and wouldn't again. Use the free tier or go straight to $20.

Where it stops: long conversations. The context window on the cheaper tiers gives out mid-task, and the ads arrive against answers on a plan you're paying for. Both are covered in what the message limit became.

3. Claude, the best frontier assistant, with no cheap way in

If your work genuinely needs the frontier, this is the app to pick. It's the one I'd choose for hard reasoning and careful writing.

The one line that matters: there is no cheap tier. Claude's ladder starts around $20 and its real capacity sits at $100, which means the only honest advice for most people is that it costs more than their use justifies. I've paid the top of that ladder for a stretch and got real work out of it, and it was also more than the work needed. The full account is in Claude Pro usage limits.

Where it stops: the moment you're paying frontier prices for everyday questions.

4. Gemini, free everywhere, and the app is the weak part

The one you may already have without paying for it, bundled into the accounts and devices you own.

The one line that matters: free and universal is a real advantage, and it's the strongest reason to try this before buying anything.

Where it stops: I've used Gemini's model through its website, not its app, so I can speak to model quality and not to app quality, and I'm not going to pretend otherwise. The wider objection is that you're inside one ecosystem: if that provider stops being at the frontier, you fall behind as its customer rather than moving.

5. DeepSeek, capable and cheap, locked to one lab

The models are good and cheap, which is why they show up behind other apps.

The one line that matters: free and capable is the strongest combination on this list after entry 1.

Where it stops: the same caveat as Gemini, and it's the more important one here. I've used DeepSeek's model through the website, not the app. A first-party app ties your subscription to one provider's pace, and this is the same lock-in that makes the app-level comparison a question about walls rather than models.

6. Perplexity, good at one job, and I cannot recommend it

An answer engine: you search, it reads and cites. For gathering sourced information on a topic, that is a different and useful thing.

The one line that matters: it's good for research and worse than a general assistant at almost everything else. In my own use the answers were noticeably shorter and less capable than the same models reached directly. That is an impression, not a measurement, and one I hold loosely.

Where it stops: the recommendation. Perplexity has faced a run of legal action over scraping and privacy: Amazon obtained a preliminary injunction in March 2026, and CNN and Reddit have both sued. I wouldn't advise paying for it while that is unresolved. I didn't pay for mine: a year came free with a phone plan, and I stopped using it well before it ended.

Why this list is not a capability ranking

Read the table again and notice that the app with the most capable models is third, and the app with the cheapest models is fifth. That's not an accident of my scoring. It's the point.

What you pay for is access to one lab's models at that lab's pace. Every frontier-first app on this list rents you a specific company's capabilities and asks you to trust that the company stays at the frontier. Until recently that was a safe bet. It's less safe now, because the models that lead change every few weeks, and a subscription (especially an annual one) commits you to a provider rather than to a capability.

That is the whole argument for the entry in slot one. A routed app isn't better than Claude or ChatGPT; it's just not holding a stale bet on your behalf, because the model behind it's re-chosen as the frontier moves. It wins this ranking on the lock-in column, not the capability column. If your work needs a specific frontier lab's absolute best, that column doesn't matter to you and you should pay for entry 3.

How to apply this to yourself

Two questions decide it, and they're both about your week rather than the apps.

How much do you ask? A few questions a week: use ChatGPT's free tier and spend nothing. Daily questions across ordinary tasks: $5 unlimited beats every tier above it.
Is your work frontier work? Multi-file code, long documents, high-stakes drafts. If yes, pay $20 without embarrassment; that is what the tiers are for. If no, no tier will show you a difference you can feel.

If you're paying for two subscriptions, read the table again. Two is roughly the price of the top tier of either, and almost nobody exhausts one.

Where this list is weakest

This list is one person's use, and three of the six entries are on it because they're widely used rather than because I've tested them to the same depth. The Gemini and DeepSeek entries rest on their websites, not their apps, and I've said so in each. The Perplexity entry turns on legal matters that were live in September 2026, and those will move.

I also built the app in slot one, so weigh the top of this list accordingly. The criterion is stated above so you can re-rank it yourself. And every price here is a 2026-09-15 snapshot. Check the pricing pages before you buy. The durable part is the argument itself: you're renting one lab's pace, and the pace is what goes stale.

If the app-level question is settled and you want the category definition, that is in what a cheap ChatGPT alternative actually means, and the fuller shortlist direction is in the cheap alternatives ranked.