1. Generation from a brief Tie, different styles
Gamma one-shots a visually rich card deck from a prompt, fast, with strong imagery. decko treats the brief as a conversation: it asks clarifying questions, proposes an outline you approve, then designs the slides. Gamma feels faster on first contact. decko's outline step pays off on decks with an argument to make, because you fix the story before any slide exists.
2. Deck structure decko
Gamma's templates are general-purpose and lean visual. decko generates consulting structures by default: executive summaries with a recommendation panel, steering committee updates, proposals, project readouts, next-steps slides with owners and dates. Slide titles are written as assertions, the way a partner would insist on. If your decks argue for a decision, this is the difference you feel daily.
3. Research and sources decko
decko searches the web while drafting and cites sources directly on the slides, so every number can be traced when a client challenges it. Gamma generates content from the model's knowledge and your prompt, without slide-level source citations.
4. Editing after generation Tie, different philosophies
Gamma has a polished web editor for its card format. decko pairs a built-in slide editor with edit-by-chat: ask for a change ("shorten slide 3", "add a Q2 numbers slide") and it happens on the canvas. And because decko exports a real .pptx, final tweaks can also happen in PowerPoint itself, where you already know every shortcut.
5. The deliverable decko, and it is not close
This is the decisive dimension for anyone who delivers files. Gamma's .pptx export flattens dynamic layouts into static images: text stops being editable text, and the client's inevitable "can you tweak slide 4" throws you back into Gamma. decko exports editable text boxes, native charts and tables, and working animations, on every plan, without a watermark. The .pptx is the product, not an afterthought.
6. Visual ceiling Gamma
Honest concession: for image-heavy, marketing-style decks, Gamma's output is flashier and its template variety is larger. decko's design language is deliberately sober, built to look clean, consistent and credible in an advisory context rather than to wow on a landing page.
7. Pricing Gamma on sticker price
As of mid-2026: Gamma is free with credits and a watermark, then Plus at about $10/month. decko's free plan includes one complete deck with research, images and full export, then Pro at 25 €/month, unlimited. Gamma wins on sticker price. But price the rework: if flattened exports cost you one rebuilt deck a month, the cheaper tool is the expensive one at any consulting rate.
Summary table
| Dimension | Gamma | decko |
|---|---|---|
| Native format | Web cards, link-first | 16:9 slides, file-first |
| PowerPoint export | Flattened, image-based | Editable text, charts, tables, animations |
| Deck structure | Generic templates | Consulting grammar, action titles |
| Sources on slides | No | Yes, cited inline |
| Editing | Web editor | Editor + edit-by-chat + PowerPoint itself |
| Visual flash | Higher ceiling | Sober by design |
| Free plan | Credits, watermark | 1 full deck, full export, no watermark |
| Paid | ~$10/mo | 25 €/mo |
The verdict
Choose Gamma if your decks live on the web, get shared as links, and win on visuals: marketing, community, personal brand content.
Choose decko if your decks are deliverables: client work, proposals, board and steering updates, anything where someone else opens the file, edits it and presents it as their own. That is the job decko was built for, and the export is where it shows.
Run the five-minute test
Generate a deck on a real topic, export it, open it in PowerPoint. Whichever tool survives that test with your actual workflow is the right one.
Create a deck freeOne full deck free, with research, images and export included.
Related: Why people leave Gamma · decko vs Beautiful.ai · Where Tome users went