Short answer: both aim at consulting-standard PowerPoint, and both show where figures come from. Choose Whyston when the deck needs an argument as well as slides: Whyston writes the SCQA storyline and action titles first, labels every number as documented, derived or an assumption, and gives you a web editor as well as a PowerPoint add-in.
Disclosure: Whyston publishes this page. Facts about Decky AI come from Decky AI's own website and documentation (linked below), reviewed in August and October 2026.
Side by side
| Whyston | Decky AI | |
|---|---|---|
| Built for | Consulting-grade decks you can defend | "PowerPoints that meet consulting standards", as an agent inside PowerPoint |
| Storyline | Governing thought, SCQA arc and MECE pillars written before any slide | No SCQA or pyramid structure documented |
| Slide titles | An action title on every slide | Yes |
| Numbers | Every number labelled as documented, derived or an assumption; source line on each slide; Figures and Assumptions page | "Every figure carries its source"; assumptions not labelled as such |
| Your sources | PDF, PPTX, DOCX, XLSX, CSV and Markdown become a citable evidence base | Your files and live web research |
| Consulting charts | Native waterfalls, Gantt roadmaps, funnels, market-size rings, with growth arrows and callouts | Consulting chart types not documented |
| PowerPoint | Native, editable PPTX; full web editor (every shape and text editable, one-click smart layouts); PowerPoint add-in on Microsoft AppSource | Runs inside PowerPoint |
| Price | Free (3 decks); Pro €29/month or €288/year for 20 decks a month | Free €0; Starter €25; Pro €50; Max €100 a month |
Where Whyston pulls ahead
- The argument first. Whyston writes the governing thought, the SCQA arc and MECE pillars before any slide.
- Assumptions made visible. Whyston labels estimates and forecasts as assumptions and lists them on a Figures and Assumptions page, not only the figures that have a source.
- Consulting exhibits. Native waterfalls, Gantt roadmaps and annotated charts.
- A full slide editor and an add-in. In the browser, edit every shape and text freely and change a slide's look and feel in one click with smart layouts; or work in PowerPoint.
When Decky AI may be enough
- You only work inside PowerPoint and edit decks slide by slide.
Choose Whyston if
- The deck comes from a data room, a financial model, research or interview notes.
- A partner, a board or an investment committee will ask where each number came from.
- You need the storyline and the action titles written, not only the slides.
- The team will keep working in PowerPoint after the first draft.
See all 25 tools compared: the best AI tools for consulting decks.