QuickHW vs Chegg vs ChatGPT: Which AI Homework Helper Actually Works?

If you're looking for a Chegg alternative or wondering whether ChatGPT can actually handle your homework, you're in the right place. We put three of the most popular homework tools head-to-head on real assignments to see which one actually delivers.

Short version: they're all decent, but they're built for very different workflows. Here's the full breakdown.

The Contenders

QuickHW (Presto AI) is a macOS app that captures your screen and solves whatever problem it sees. Chegg Study is the OG homework answer database plus a newer AI chatbot. ChatGPT is the general-purpose AI that everyone already has open in a tab.

Three very different tools. Let's see how they compare on the things that actually matter.

Speed: How Fast Do You Get an Answer?

This is where the differences hit hardest.

QuickHW is the fastest by a wide margin. Press Cmd+Shift+X, select the area of your screen with the problem, and a solution appears in a floating overlay within seconds. No typing, no describing, no uploading. The whole interaction takes under 10 seconds for most problems.

ChatGPT requires you to type out or paste the problem. For a simple text question, that's fast enough. For anything involving equations, symbols, or diagrams, you're spending 30 seconds to a few minutes just getting the input right. And then you might need to ask follow-up questions to get the format you want.

Chegg depends on whether your exact problem is in their database. If it is, search and done — maybe 15 seconds. If it's not, you're either asking their AI (which is slower and less capable than ChatGPT) or posting a question and waiting for an expert response, which can take hours.

Winner: QuickHW. Screen capture eliminates the input bottleneck entirely.

Accuracy: Do the Answers Actually Check Out?

We tested each tool on 20 problems across calculus, physics, organic chemistry, and computer science.

QuickHW got 17 out of 20 correct on the first try, with the three misses being partially correct (right approach, arithmetic error in one step). The step-by-step breakdowns were consistently detailed and well-organized.

ChatGPT scored 14 out of 20. It nailed the conceptual explanations but made calculation errors on several multi-step math and physics problems. Its essay and coding help was excellent, though. The pattern: great at explaining, inconsistent at computing.

Chegg scored 16 out of 20 — but only on problems where we found an exact textbook match. For problems not in their database, their AI assistant scored closer to 12 out of 20. The human-written solutions are generally high quality; the AI add-on is a mixed bag.

Winner: QuickHW for overall accuracy, Chegg for textbook-specific problems (when they have them).

Workflow: How Does It Fit Into Your Study Session?

This is the underrated comparison. A tool can be accurate, but if it's clunky to use while you're actually doing homework, you won't stick with it.

QuickHW lives in your Mac's menu bar. You're working on a problem set in your browser or PDF reader, you hit the shortcut, it solves what's on screen, and the answer floats on top of your work. You never leave your homework environment. For people who do everything on a MacBook, this is the dream workflow.

ChatGPT means another browser tab. You're flipping between your homework tab and the ChatGPT tab, copying and pasting, scrolling back and forth. It works, but there's friction. And if the problem is visual, you're taking a screenshot, uploading it, waiting for processing — it adds up.

Chegg is also a browser tab, plus you're dealing with a search interface. If the problem is in their database, the workflow is fine. If not, the UX gets messy — bouncing between their AI, their Q&A board, and the search results.

Winner: QuickHW. The overlay model is genuinely a better interaction pattern for homework.

Pricing: What Are You Actually Paying?

ChatGPT's free tier is generous, but the Plus plan at $20/month is the priciest option here — and you're paying for a general AI assistant, not a homework-specific tool. Chegg at $15.95/month feels increasingly hard to justify when AI tools do most of what it offers for less. QuickHW's $9.99 is the cheapest paid option and the most focused on the actual homework use case.

Winner: Depends on your budget. ChatGPT free if you're broke. QuickHW for best value on a paid plan.

The Chegg Problem

We need to talk about the elephant in the room. Chegg used to be the default homework tool, but it's been losing ground fast. Here's why students are looking for a Chegg alternative:

• Professors know. Many schools have caught on to Chegg. Some professors specifically design assignments to catch Chegg-sourced answers, and Chegg has cooperated with academic integrity investigations.
• The AI isn't great. CheggMate, their ChatGPT competitor, is noticeably less capable than ChatGPT itself.
• The price keeps climbing. At $15.95/month, Chegg is more expensive than QuickHW and delivers less AI capability than ChatGPT.
• The answer database is aging. New textbook editions, custom assignments, and professor-written problems increasingly fall outside Chegg's library.

Chegg still has value if your classes use popular textbooks with well-established problem sets. But for everything else, there are better options now.

The ChatGPT Limitation

ChatGPT is amazing at a lot of things, but using it for homework has real friction points:

• Input is slow. You have to type or paste everything. Equations need special formatting. Diagrams need photo uploads.
• Math errors are common. It's a language model, not a calculator. Multi-step computation is its weakest area.
• No homework context. It doesn't know what class you're in, what you've already covered, or what your professor expects. You have to provide all that context manually.
• Tab-switching tax. Every time you switch between ChatGPT and your homework, you lose focus. It sounds trivial but it adds up over a 3-hour study session.

ChatGPT is a fantastic supplement — great for "explain this concept" or "debug this code." But as a primary homework tool, it has gaps that purpose-built alternatives fill better.

So Which One Should You Use?

Here's the honest answer:

• Use QuickHW if you do homework on a Mac and want the fastest, most seamless workflow. Screen capture + floating overlay is genuinely better than copy-pasting into a chat window.
• Use ChatGPT if you need a general-purpose AI for essays, coding, concept explanations, or anything that's easy to express in text.
• Use Chegg if your classes use common textbooks and you want the exact, expert-written solutions from the textbook's solution manual.

And honestly? Most students will benefit from using two of these. QuickHW for the day-to-day problem-solving, ChatGPT for the concept deep-dives and essay help. That combo covers about 95% of what you'll encounter in undergrad.

For more options, check out our full ranking of the 7 best AI homework tools in 2026.