ProphetProphet vs Sider: AI Sidebar Extensions Compared
Prophet vs Sider feature comparison. Discover how Prophet's pay-per-use model and 18 browser automation tools compare to Sider's multi-model sidebar with GPT-4, Gemini, and Claude.
Last updated: March 2026
Prophet and Sider take different approaches to browser AI. Prophet focuses on deep browser automation through 18 Chrome DevTools Protocol tools and an accessibility-tree approach that delivers fast, deterministic interactions without vision models. It uses pay-per-use pricing, so you never pay for a month you don't use. Sider has its own strengths -- notably supports gpt-4, gemini, and claude in a single extension, giving users model flexibility. The right choice depends on whether you need real page automation (Prophet) or Sider's specific ecosystem advantages.
Feature Comparison: Prophet vs Sider
A side-by-side breakdown of how Prophet and Sider handle the key capabilities you need from a browser AI extension. This comparison covers page understanding, automation depth, pricing, model selection, and data privacy.
| Feature | Prophet | Sider |
|---|---|---|
| Page Understanding | Accessibility tree snapshots | Page text extraction |
| Speed | Fast - structured data, no vision model | Fast for chat; limited automation speed |
| Pricing Model | Pay-per-use credits | Monthly subscription tiers |
| Starting Price | Free ($0.20 credits included) | Free tier with daily limits, Pro from $10/month |
| Browser Automation | 18 tools (click, fill, navigate, tab management) | Limited - mainly text selection and summarization |
| Models Available | Claude Haiku 4.5, Sonnet 4.6, Opus 4.6 | GPT-4, Claude, Gemini, and others |
| Data Privacy | Page content processed locally; messages only to API | Page content sent to multiple third-party AI providers |
| Open Source | Yes - full source on GitHub | No - closed source |
Where Prophet Wins
Prophet's core advantages come from its architectural decisions: the accessibility tree for page understanding, Chrome DevTools Protocol for automation, and a usage-based billing model that aligns cost with value.
Full browser automation with 18 tools that can click, type, navigate, and manage tabs - not just read page text
Pay-per-use pricing so light users save significantly compared to a flat monthly fee
Open source codebase allows inspection of exactly what data is sent and where
Accessibility tree approach provides deterministic element targeting for reliable automation
Where Sider Wins
Sider has legitimate advantages that matter depending on your use case. Here is where it pulls ahead:
Supports GPT-4, Gemini, and Claude in a single extension, giving users model flexibility
Mature product with a large user base, polished UI, and features like AI reading lists and group chat with multiple models
Which Should You Choose?
Choose Prophet if you need an AI that can actually interact with web pages -- clicking buttons, filling forms, navigating between pages, and managing tabs. Prophet's 18 automation tools go far beyond reading and summarizing text. Its pay-per-use pricing also makes it the better choice for users whose AI usage varies month to month. If you value open source transparency and want to verify exactly what data your browser extension collects, Prophet's public GitHub repository gives you that assurance.
Choose Sider if supports GPT-4, Gemini, and Claude in a single extension, giving users model flexibility, and mature product with a large user base, polished UI, and features like AI reading lists and group chat with multiple models. If those specific capabilities are central to your workflow, Sider may be the better fit despite Prophet's automation advantages.
Both tools can be installed side by side in Chrome, so you can test each on your actual workflow before committing. Prophet's free tier includes $0.20 in credits -- enough for dozens of messages to evaluate whether it meets your needs.
Try Prophet Free
Install the extension, get $0.20 in free credits, and see how accessibility-tree automation compares to Sider. No credit card required.