Dia vs Sider
A side-by-side comparison of Dia and Sider, two Assistant tools, drawn from Ignaite's continuously-verified listings.
Compared from listings verified as of
At a glance
| Attribute | Dia | Sider |
|---|---|---|
| Category | Assistant | Assistant |
| Pricing | FREEMIUM | FREEMIUM |
| License | Proprietary | Proprietary |
| Deployment (differs) | Local | — |
| Platforms (differs) | macOS | Browser extension |
| Model support (differs) | — | Multi-model |
| Vendor (differs) | The Browser Company | Sider AI |
| Capabilities (differs) |
|
|
The honest brief
Dia
From the makers of Arc; AI lives in the address bar aware of your open tabs and history, not a bolted-on chatbot.
- AI baked into the URL bar
- Tab- and history-aware context
- Reusable 'skills'
- Free tier for light use
- macOS only
- Closed source
- Pro at $20/mo to lift AI limits
- Young product, evolving feature set
Sider
Built browser-first, not a chatbot bolted on — one subscription spans multiple model providers on any tab.
- Multi-model (Claude, GPT, Gemini) in one plan
- Among most-installed browser AI assistants
- Side-panel UX tuned for web pages and PDFs
- Works across Chrome, Edge, and more
- Closed source
- Heavy users hit message/credit limits
- Less media generation than Monica
When to pick which
They share capabilities, but each leads with different ones as a headline job:
Dia is built around Chat with documents.
- Chat with documents (primary capability)
Sider is built around Summarization.
- Summarization (primary capability)
They also differ on:
- Platforms
- macOS · Browser extension
Their capability lists differ in recorded depth — compare the full lists above before deciding.