HARPA AI vs Sider
Which should you use? A side-by-side look at what each one does, who it suits, what it costs, how hard it is to set up, and where each falls short.
AI tool · Freemium
A Chrome extension combining AI chat with web automation, page monitoring and custom commands.
AI tool · Freemium
A sidebar AI extension for chatting with pages, PDFs and images using multiple models.
The short answer
Choose HARPA AI if you need…
- Automating repetitive browser tasks
- Monitoring page changes
Choose Sider if you need…
- Reading assistance in the browser
- Comparing model answers
Side-by-side
| HARPA AI | Sider | |
|---|---|---|
| Type | Plugins & extensions · AI browser extensions | Plugins & extensions · AI browser extensions |
| Price | Freemium | Freemium |
| Platforms | Chrome | Chrome, Web, macOS, Windows, iOS, Android |
| Works with | Chrome | Chrome |
| Hands-on tested by us | Not yet | Not yet |
| Last checked | 2026-10-29 | 2026-10-29 |
What each one is
HARPA AI
A Chrome extension combining AI chat with web automation, page monitoring and custom commands. Uniquely automation-focused. Setup takes effort to get real value.
Sider
A sidebar AI extension for chatting with pages, PDFs and images using multiple models. Capable and popular. Overlaps heavily with similar sidebar extensions.
Best for
HARPA AI
- Automating repetitive browser tasks
- Monitoring page changes
Sider
- Reading assistance in the browser
- Comparing model answers
Strengths
HARPA AI
- AI chat on any page
- Custom automation commands
- Price and page monitoring
- Bring-your-own-key
Sider
- Sidebar chat
- Chat with PDFs and pages
- Image tools
- Translation
Frequently asked questions
What is the difference between HARPA AI and Sider?
HARPA AI: A Chrome extension combining AI chat with web automation, page monitoring and custom commands. Sider: A sidebar AI extension for chatting with pages, PDFs and images using multiple models. HARPA AI suits automating repetitive browser tasks, while Sider suits reading assistance in the browser.
Are HARPA AI and Sider free?
HARPA AI: Freemium. Sider: Freemium.
What are other alternatives to HARPA AI and Sider?
Other options people compare them with include MaxAI, Merlin, Monica.
Keep comparing
Built from our catalogue entries for both products: open-source details come from each project's README (AI-assisted, refreshed weekly) and GitHub data; AI-tool details are editorial. Spotted something wrong? Let us know from either product's page.