Gamma vs idmly
Last updated October 2026 · by Kelly Fraser, maker of idmly
Gamma generates the design. idmly converts a design into InDesign. Gamma exports PDF, PNG and PowerPoint, with no InDesign or HTML export, so a Gamma deck can't go through idmly. If the file has to end up editable in InDesign, make the design as HTML and convert that.
Gamma is an AI tool for presentations, documents and web pages. idmly takes a self-contained HTML design (from Claude, ChatGPT, v0, Figma Make or your own code) and returns a native .idml: real text frames, named paragraph styles, editable vector charts. The first two pages convert free.
Same caveat as my other comparisons: I make idmly, so read this with that in mind. I checked Gamma's export help page in October 2026 and I'm describing what it lists. If that changes, tell me and I'll fix this page.
The core difference: making the design vs moving it
Gamma writes and lays out the deck for you from a prompt, and it's good at it. What it hands back is a PDF, a PNG per card, or a PowerPoint file. Its help centre covers Google Slides too, by way of uploading the PowerPoint. InDesign isn't on the list, and neither is HTML.
idmly doesn't design anything. It renders your HTML in a real browser, reads the computed layout, and writes the .idml directly. No PDF sits in the chain. That only works when there's HTML to read, which is why a Gamma deck is out of reach for it.
| idmly | Gamma | |
|---|---|---|
| What it is | HTML/CSS to InDesign converter | AI presentation, document and web page maker |
| Generates the design | No. You bring the HTML | Yes, from a prompt |
| Export formats | Native .idml (opens in InDesign and Affinity Publisher) | PDF, PNG, PowerPoint |
| Editable InDesign file | Yes: text frames, named styles, vector charts, linked images | Not offered |
| Input it needs | A self-contained .html file | A prompt, notes or a document |
| Price | First 2 pages free; $49 once, unlimited | Free plan with a watermark on exports; paid plans remove it |
| Best for | AI, web and coded designs that must be delivered as InDesign | Decks you'll present or share as a link, PDF or PowerPoint |
How to get a Gamma deck into InDesign
If the deck already exists in Gamma, these are the routes, ranked by how much of it stays editable.
| Route | What you get | Editable? | Time |
|---|---|---|---|
| Rebuild it by hand | A faithful file, if you have the hours | Fully | Hours per deck |
| Export PDF or PowerPoint, run a PDF-based converter | Recovered text and shapes, often fragmented; fonts can be substituted | Partly | Minutes, plus cleanup |
| Export PDF, place it in InDesign | One flat, locked picture per page | No | Seconds |
| Export PNG, place it | An image of each card | No | Seconds |
For the converter route, Recosoft PDF2ID takes PDF and PowerPoint, and Markzware PDF2DTP takes PDF. Both are compared in the PDF-to-InDesign converter guide. Why the placed PDF arrives locked is covered in why a PDF imports as uneditable outlines.
If InDesign is where the file has to end up
Decide that before you generate, because it changes which AI tool you start in. Ask Claude or ChatGPT for the report, deck or one-pager as a self-contained, page-sized HTML file. Drop that into idmly and the InDesign file comes back with the structure intact, usually in under thirty seconds.
- →Text stays as text frames you can reflow.
- →Headings and body copy arrive as named paragraph styles.
- →Charts are redrawn as vectors you can recolour.
- →Fonts are bound by name, never outlined.
The full walkthrough is in how to convert an AI-generated design to InDesign.
When Gamma is the right call
You need a deck today, you'll present it from the browser or send a PDF, and nobody downstream needs to open it in InDesign. Gamma is fast at that and idmly doesn't compete with it.
When idmly is the right call
The design has to be handed to a studio, a printer or a client team that works in the Adobe suite, and you have it (or can generate it) as HTML. Check the first two pages free, and pay $49 once if it's what you need.
Frequently asked questions
Can Gamma export to InDesign?
Can idmly convert a Gamma presentation?
Is idmly an alternative to Gamma?
.idml file.How do I get an AI-generated design into InDesign?
Which AI design tools work with idmly?
.html file: Claude, ChatGPT, v0, Lovable, Bolt, Gemini and Figma Make, plus hand-coded HTML. idmly reads the rendered browser layout, so the tool that wrote the HTML does not matter.Is idmly free?
Have the HTML? Get the InDesign file.
Drop your design in and watch the first two pages come back as a real, editable InDesign file, free.