# Dex by Thirdlayer vs Jeno

Dex by Thirdlayer records 9,262 monthly visits with +9.5% month-over-month growth and Freemium pricing. Jeno records 0 monthly visits with — growth and Free pricing.

| Metric | [Dex by Thirdlayer](https://openaitools.app/tool/dex-by-thirdlayer) | [Jeno](https://openaitools.app/tool/jeno) |
| :--- | :--- | :--- |
| Website URL | https://joindex.com | https://chromewebstore.google.com/detail/jeno/ljpobhndkmnljniigcmagognjpahicch |
| Categories | AI Browsers, AI Assistant, AI Task Management | AI Browsers, AI Assistant, AI Productivity Tools, AI Writing Assistants |
| Pricing Model | Freemium | Free |
| Monthly Visits | 9,262 | 0 |
| MoM Growth Rate | +9.5% | — |
| Primary Market | United States | Global |
| Direct Visits | 5,753 | 0 |
| Review Score | 4.3 | 3.3 |
| Saved Count | 0 | 0 |
| Supported Platforms | Website | Browser Extension |

## Dex by Thirdlayer

Dex is built around the idea that agents fail when they only retrieve facts. Instead of a shallow search layer, Dex assembles two linked memory systems: an Operational Graph that records entities, relationships, timelines and dependencies across your operations, and a Knowledge Manual that holds the judgment layer — priorities, open loops, relationship context, SOPs and operating principles. The manual is explicitly editable and automatically maintained, so you stay in control of what the AI treats as true.

On top of that context, Dex runs autonomous agents that orchestrate across Gmail, Slack, CRM systems and 20+ other tools, triggered by events or schedules. Because it lives in the browser, it can also act directly in the page: navigating tabs, filling forms and completing work where the context already exists. Your operational context is portable too — an SDK and MCP support let you bring it into other agents and workflows.

Dex also improves with use. It learns from your corrections, approvals and repeated patterns. A Dreamer Agent reasons around the clock over new data to spot emerging patterns and keep your knowledge base current, while a Skill Builder Agent proposes custom automations each week based on the workflows you repeat. Typical wins include meeting prep with full history, follow-ups drafted from call notes, task triage that reflects your priorities, and CRM updates without manual data entry. Dex is available on Chrome (with iMessage, Slack and desktop clients listed as coming soon), offers 256-bit encryption, and supports private cloud deployment for teams that need data isolation.

**Pricing & Plans:** Freemium with an onboarding-based entry point. The site invites users to install Dex and then book an onboarding call; the vendor also mentions talking to them about private cloud, which is typically an enterprise conversation. No public price list is published, so check the site for current plan details.

- **Operational Graph:** A living organisational record that organises every message, meeting, deal update and workflow event into entities, relationships, timelines and dependencies.
- **Knowledge Manual:** An editable, automatically maintained layer for priorities, open loops, SOPs and operating principles — the judgment side of your assistant.
- **Autonomous agents:** Agents that orchestrate across Gmail, Slack, CRM and 20+ tools, triggered by events or on a schedule.
- **Browser control:** Dex can navigate tabs, fill forms and complete tasks directly in your browser, cutting context switching.
- **Dreamer and Skill Builder agents:** One reasons 24/7 over new data to keep context current; the other proposes custom automations weekly from your repeated workflows.
- **SDK and MCP access:** Bring your operational context into any other agent, tool or workflow you already use.

**Strengths:** Differentiated memory model that separates factual retrieval from judgment-based reasoning; Browser-first design means it works where your context already lives; Acts as well as answers: agents execute tasks across Gmail, Slack, CRM and more; Context is portable via SDK and MCP rather than locked inside one chat window

**Limitations:** Onboarding is currently invite/call-based rather than fully self-serve; Requires connecting several tools and some ramp-up before the context compounding pays off; No public price list, so budgeting requires contacting the vendor; Some clients (iMessage, Slack, desktop) are still listed as coming soon

[Profile (Markdown)](https://openaitools.app/tool/dex-by-thirdlayer.md)

## Jeno

Jeno is a small Chrome extension that turns your browser into an AI workspace. Instead of copying paragraphs into a separate chatbot tab, you can open Jeno while you are on a page and use the AI to interact with what is already in front of you or to generate new text from it.

It is aimed at people who work in the browser all day: content creators drafting posts, social media managers responding to comments, and anyone who wants quick help summarising or rewording something they just read. The extension sits in the toolbar and is invoked on demand, so it does not clutter the page until you need it.

Jeno is a lightweight, niche extension rather than a full-blown writing suite. Its Chrome Web Store listing shows a small user base, so treat it as a simple utility: a handy way to get AI assistance on the page you are on, without expecting the depth of a dedicated editor or a paid AI subscription.

**Pricing & Plans:** Jeno is distributed as a free Chrome extension. There is no published paid tier on its store listing.

- **Chat with page content:** Select text or context on a page and work with it through AI instead of copying it into a separate tool.
- **Content generation in the browser:** Draft posts, replies and other short-form text without leaving the page you are working on.
- **Creator-focused workflow:** Aimed at creators and social media managers who need fast, context-aware drafts from the web.
- **Lightweight sidebar experience:** A small extension (around 1.4 MB) that lives in the toolbar and opens when you need it.
- **Privacy-friendly disclosure:** The developer declares no data selling and no use of your data beyond the extension's core function.

**Strengths:** Free to install from the Chrome Web Store; Works on the page you are already reading, so no tab switching; Very small install footprint; Useful for quick drafts and rewording, not just chat

**Limitations:** Small user base and no ratings, so limited community feedback; Extension was last updated in 2024, so feature development may be slow; Narrow feature set compared with full writing assistants

[Profile (Markdown)](https://openaitools.app/tool/jeno.md)

## Frequently Asked Questions

### How do Dex by Thirdlayer and Jeno compare in monthly traffic?

Dex by Thirdlayer has 9,262 monthly visits, while Jeno has 0. Traffic estimates describe audience size, not product quality.

### How do their growth rates compare?

Dex by Thirdlayer has a month-over-month growth rate of +9.5%; Jeno has —.

### How does pricing compare?

Dex by Thirdlayer: Freemium. Freemium with an onboarding-based entry point. The site invites users to install Dex and then book an onboarding call; the vendor also mentions talking to them about private cloud, which is typically an enterprise conversation. No public price list is published, so check the site for current plan details. Jeno: Free. Jeno is distributed as a free Chrome extension. There is no published paid tier on its store listing.

## Alternatives

| # | Tool Name | Monthly Visits | MoM Growth Rate | Pricing Model | Summary | Profile (Markdown) |
| :--- | :--- | :--- | :--- | :--- | :--- | :--- |
| 1 | [Monica](https://openaitools.app/tool/monica-ai) | 4,512,775 | -11.3% | Freemium | All-in-one AI assistant across web, browser, desktop and mobile | [.md](https://openaitools.app/tool/monica-ai.md) |
| 2 | [Sider](https://openaitools.app/tool/sider) | 2,644,740 | -10.6% | Freemium | AI sidebar and browser agent for reading, writing and research | [.md](https://openaitools.app/tool/sider.md) |
| 3 | [Merlin AI](https://openaitools.app/tool/merlin-ai) | 1,382,634 | +13.1% | Freemium | One-click AI assistant for browsing, writing and research | [.md](https://openaitools.app/tool/merlin-ai.md) |
| 4 | [Dia Browser](https://openaitools.app/tool/dia-browser) | 1,254,172 | +108.4% | Free | The AI browser that reads between your tabs | [.md](https://openaitools.app/tool/dia-browser.md) |
| 5 | [Tabbit Browser](https://openaitools.app/tool/tabbit-ai) | 670,981 | -30.2% | Freemium | The agentic AI browser that reads your tabs, files, and screenshots as context | [.md](https://openaitools.app/tool/tabbit-ai.md) |
| 6 | [HARPA AI](https://openaitools.app/tool/harpa-ai) | 537,461 | +99.3% | Freemium | One browser agent that combines every major AI model with web automation | [.md](https://openaitools.app/tool/harpa-ai.md) |
| 7 | [Sigma AI Browser](https://openaitools.app/tool/sigma-ai-browser) | 240,775 | -47.1% | Free | A private Chromium browser with a built-in AI agent and offline LLM | [.md](https://openaitools.app/tool/sigma-ai-browser.md) |
| 8 | [Kome AI](https://openaitools.app/tool/kome-ai) | 174,910 | -6.5% | Freemium | Summarize, bookmark and write with AI right in your browser | [.md](https://openaitools.app/tool/kome-ai.md) |
| 9 | [Opera Neon](https://openaitools.app/tool/opera-neon) | 133,006 | -9.5% | Paid | An agentic browser built to act on your behalf | [.md](https://openaitools.app/tool/opera-neon.md) |
| 10 | [SigmaOS Airis (Alpha)](https://openaitools.app/tool/sigmaos-airis-alpha) | 90,910 | +9.2% | Freemium | A Mac browser built for focus, with an AI companion called Airis | [.md](https://openaitools.app/tool/sigmaos-airis-alpha.md) |

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Source: https://openaitools.app/compare/dex-by-thirdlayer-vs-jeno

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