Gamma is the better app overall, scoring 8.5 to 8.1. Gamma wins on 3 of the 5 scores, Dia on 1, with 1 tied.
Students, founders and marketers who need a good-looking deck fast
Office workers who juggle email, docs and meetings in the browser
Score by score
The details
| Feature | Gamma | Dia |
|---|---|---|
| Category | AI Assistants | AI Assistants |
| Category rank | #6 of 16 | #12 of 16 |
| Developer | Gamma | The Browser Company |
| Pricing | Free + paid plans | Free + paid plans |
| Usable for free | Yes | Yes |
| iPhone & iPad | ✓ | — |
| Android | ✓ | — |
| Mac | — | ✓ |
| Windows | — | ✓ |
| Web | ✓ | — |
Common questions
Is Gamma better than Dia?
Gamma is the better app overall, scoring 8.5 to 8.1. Gamma wins on 3 of the 5 scores, Dia on 1, with 1 tied.
Which is cheaper, Gamma or Dia?
Gamma: Free with 400 starter credits; Plus is $12 a month, or $9 a month billed yearly. Dia: Free browser has no AI; Better Answers is $10 a month and Better Days $100. On value for money, Gamma scores higher.
Do Gamma and Dia work on the same devices?
Only Gamma runs on Web, iPhone & iPad, Android. Only Dia runs on Mac, Windows.
Which is more private, Gamma or Dia?
Dia scores higher on privacy (8.2/10). History, chats and files are encrypted on your device, and Sync is end-to-end encrypted. AI partners can't train on your data. Dia keeps some unlinked content 30 days to improve itself unless you opt out.
Strengths and weaknesses
Gamma
- Polished first drafts from a short prompt
- Exports to PowerPoint and Google Slides on every plan
- Imports your existing PDFs and PowerPoint files
- Free credits are a one-time grant that never refreshes
- Free plan caps you at 10 slides per prompt
- Individual plans train on your content unless you opt out
Gamma turns a prompt, an outline or a pasted document into a polished presentation, doc, website or social post in moments. Gamma 5, released in October 2026, lets you talk the idea through with its agent before it builds anything, then fine-tune on a freeform canvas. Exports to PowerPoint, PDF and Google Slides work even on the free plan. Free credits never refresh, though, and free decks carry Gamma branding.
Full Gamma review
Dia
- Calm, uncluttered design from the makers of Arc
- Data is stored and encrypted on your device
- AI partners are barred from training on your data
- New users' free plan has no AI features
- Better Days plan costs $100 a month
- Windows version is still an early build
Dia comes from the team behind Arc and puts an AI chat beside your tabs that can read what's open and pull in context from Slack, Notion and Teams. Its Morning Brief, meeting prep and deck building are aimed squarely at office work. Privacy is better than most AI browsers, with your data stored on your device. Since August 2026, though, new users get no AI on the free plan, and the Windows version is still young.
Full Dia review
