Gamma AI is a UI-first AI presentation maker: a person types a prompt and Gamma designs a polished deck, document, or website inside a browser editor. heydecks is the agent-native alternative, an AI slide creator that apps and AI agents call over REST or MCP to generate on-brand decks programmatically, returning a live link, a PDF, and an editable PowerPoint from one request.

I run heydecks, so treat this as a partisan but honest read. Gamma is a good product, and if you're one person making one deck by hand, it is usually the faster choice. What this post is actually about is the case Gamma doesn't aim at: when a backend, an agent, or a nightly job has to produce the deck with nobody sitting in the slide editor. That's the line worth drawing. heydecks is the AI slide creator that AI agents call over REST or MCP; from a prompt, markdown, or a URL it returns a live deck link, a PDF, and a native, editable PowerPoint, every export locked to your brand by the Brand Kernel.

#What is Gamma AI, and who is it built for?

Gamma AI is a browser-based generator that turns a prompt, an outline, or an uploaded file into a deck, doc, or site in roughly a minute. It uses a stack of language models plus its own layout system to write the copy and arrange it into "cards," a web-native format that grows vertically instead of forcing everything into a fixed 16:9 box. After the first draft lands, you refine it in a block editor or chat with Gamma's agent to restyle a section, rewrite the tone, or regenerate a card.

The audience is a human with a deck to make and not much time. Founders putting together a first pitch, marketers spinning up a campaign one-pager, students, consultants drafting a proposal. Gamma is genuinely strong at this: the design quality out of the box beats what most people would build by hand in PowerPoint, and the learning curve is close to zero. None of that is in dispute here. The question is what happens when the person in the editor isn't there.

#How much does Gamma AI cost, and can you use it for free?

Yes, Gamma has a free tier, and that free tier is where a lot of the confusion comes from. New accounts get a one-time allotment of AI credits that don't refresh once spent, and decks made on the free plan carry a "Made with Gamma" badge on export. Paid subscriptions remove the badge, raise the credit and card limits, and open up things like PPTX and PDF export and custom fonts, with higher tiers adding analytics and custom domains.

So the honest answer to "is Gamma AI free?" is: free to try, subscription to use seriously. The credit model is metered, which suits hands-on work where a person decides each time whether a generation is worth a credit. It fits less well when software is the one calling generate, hundreds of times, on a schedule, because then you're reasoning about per-credit pricing inside a pipeline rather than a checkout.

#When is Gamma the right call, and when do you need an API instead?

Use Gamma when a person is going to drive it. You want to sit with the deck, try three layouts, nudge a headline, and walk out with something polished. That's the job Gamma is built for, and swapping in an API for that workflow would be a downgrade.

Reach for an API when software has to make the deck. A few concrete cases I hear about:

• A SaaS product that hands every customer a generated quarterly report deck, on the customer's own brand, with no designer in the loop.
• An AI agent whose job includes "produce the deck" as one step in a longer task, so it needs a tool it can call, not a website it has to click through.
• A back-office process that turns CRM rows or a markdown export into client decks overnight and drops the files into a folder by morning.

The dividing line is one question: is there a human in the slide editor? Gamma assumes yes. heydecks assumes no, and is built so an API call or an agent does the work end to end. That's the difference the rest of this comes down to.

#Gamma AI vs heydecks: how the two compare

Here's the side-by-side. Both make AI decks; they're pointed at different operators.

Read the table as two different defaults, not a winner and a loser. If your honest answer to "who clicks generate?" is "me," the left column is probably your tool. If the answer is "our server" or "the agent," the right column is the one that won't fight you.

#Does Gamma AI export an editable PowerPoint?

It exports a PowerPoint, and whether it's editable enough depends on what you need to do next. Gamma's native format is the web card, so a PPTX export is a translation from cards into slides rather than the source of truth. People who then have to reopen that file in PowerPoint and restyle it sometimes find the layout doesn't map onto clean, standard slide objects, which means manual cleanup. Gamma has improved this over time, and for a read-only handoff it's often fine. For a file someone will heavily edit, it can be a chore.

heydecks treats the editable .pptx as a first-class output, not an afterthought. Decks are built from real slide types, so the PowerPoint that comes out opens as actual editable slides, with text in text boxes and your brand already applied through the Brand Kernel. If the workflow downstream is "the sales team will tweak this in PowerPoint," that distinction is the whole ballgame. You bring the content; heydecks builds an artifact your tools can keep working on.

#How do you generate on-brand decks from a URL, over an API or MCP?

This is the part Gamma's marketing doesn't speak to, because Gamma is a destination you visit. heydecks is a thing your code calls. You send a prompt, markdown, or a URL to the REST API and you get back a brand-locked deck.

The switch is one call. Post your source to /v1/generate, and heydecks queues a job:

curl -X POST https://heydecks.com/v1/generate \
  -H "Authorization: Bearer hd_live_…" \
  -H "Content-Type: application/json" \
  -d '{
    "input": "Q3 board update: revenue up 18 percent, three risks, ask for budget approval",
    "brand_id": "brand_abc"
  }'

That returns a job_id. Poll GET /v1/jobs/{id} at a two-second interval; when it reports succeeded, the response carries the deck and its live URL. From there the same deck downloads as a PDF and as a native, editable PowerPoint, both locked to your brand. Prefer agents over polling? The hosted MCP server lets a model design and publish the deck in natural language, skipping the generate-and-poll loop entirely. And because the Brand Kernel can be pulled straight from a public URL, you can hand heydecks a homepage and get decks that already match the colors, fonts, and logo.

Here's a deck heydecks built from a single URL, rendered on a sample brand. Give it a web page, get a deck back.

If you're weighing the switch, the Gamma alternative for agents page lays out the trade-off in full, the deck generation REST API is the core of it, and the hosted MCP server wires the same thing into Claude and other agents.

#Frequently asked questions

#Who owns Gamma AI?

Gamma is made by an independent, venture-backed company, Gamma Tech, founded around 2020 by Grant Lee, Jon Noronha, and James Fox. Grant Lee is the CEO. It isn't owned by a larger platform; it's a standalone startup that raised outside funding to build its AI presentation product.

#Is Gamma AI safe to use?

For most everyday work, yes; Gamma is a standard cloud SaaS with the usual account and data controls. The caveats are the normal ones for any AI tool: your inputs are processed in the cloud, so don't paste anything you're contractually barred from sending to a third party, and check your plan's data terms if you're in a regulated setting. None of that is specific to Gamma.

#Is Gamma better than ChatGPT for making slides?

For finished slides, usually yes, because they're built for different jobs. ChatGPT writes text and can draft an outline, but it doesn't lay out, theme, or design a deck. Gamma takes a prompt and returns a designed presentation with structure and visuals already in place. If you want a deck rather than an outline, a purpose-built tool like Gamma or heydecks does the part ChatGPT leaves to you.

#Can heydecks generate a deck without a human in the editor?

Yes, that's the point of it. An API call or an AI agent sends a prompt, markdown, or a URL, and heydecks returns a live deck link, a PDF, and an editable PowerPoint, every export on your brand, no slide editor required. You still own the content and the story; heydecks builds the artifact around it.