Automation and integrations decision
CursorDance, LLC
A capable developer can build a useful subset (vertical tab manager + basic AI chat/agent) using existing OSS components, but matching the full paid product (cross-browser polish, extensive agent tooling, and cloud UX) is a multi-week effort and likely not worth reimplementing for most users.
Visit website↗$4.9/mo
$59/yr
Read off the official pricing page.
$100one-off74 h to build
$40/mo6 h/mo upkeep
On cash alone, building overtakes the subscription at 10 seats.
Open-source builds that already do this
Every project below is open source and already does this job today. Fork one, self-host it, or take the parts you need - the build prompt further down assumes an empty file, and this is the shortcut past that. Licences differ; check the one on each card before you ship. All CursorDance, LLC alternatives, with the arithmetic →
What a replacement has to do
- Manage vertical tab sidebar, group tabs into spaces, sync spaces to cloud, chat with AI about open tabs, run simple agent automations (group, restore, search).
What it still won’t have
- Polish, UX refinements and cross-browser edge-case fixes
- Mature cloud scaling, analytics, and paid support
- Proprietary integrations and beta features (YouTube chat tool, Reddit tool) as shipped
- Marketing, reviews, and established user trust
What remains hard
- Product polish and ongoing maintenance
First-year cost
Keep paying
Paying is—cheaper in year one.
On cash alone, building overtakes the subscription at 10 seats.
Money you would actually spend
Time you would spend
—
What you would spend
What we assumed
The verdict above measures whether you could build it. This one is only about money.
Runnable build prompt
Build a cross-browser extension (Chrome/Edge/Brave/Firefox) with a React + TypeScript sidebar UI and a minimal Node.js + Firebase (Firestore) backend. In scope: vertical sidebar UI for spaces and tabs, fuzzy search, create/rename/delete spaces, group tabs by domain, suspend/restore tabs, copy-all-URLs, OAuth sign-in, simple cloud sync of spaces and chat history, LLM chat integration via OpenAI-compatible API (configurable API key/BYOK), and an agent action runner that maps a small set of NL commands to browser.tab API calls. Out of scope: advanced paid feature gating, full stores publishing automation, analytics dashboards, and third-party site-specific tools (YouTube/Reddit specialized tools). Include error handling, input validation, automated tests for core flows, and CI for extension build and deployment.
How we checked
How the score was reached
- Partly verdict base52
- An open-source build was found+5
- 5 cited sources+3
- Price verified on pricing page+3
- 3/3 assessment runs agreed+4
- Evidence score67
The base comes from the verdict. Everything under it is a check that either happened or did not, and each one is a fact frozen in this record rather than a judgement made at render time - so the same evidence always produces the same number.
How scoring works →Cited sources · 5
Every page the run actually retrieved.
- official productSide Copilot — official product
- official pricingSide Copilot Pricing
- official docsSide Copilot Use Cases
- open sourcen8n-io/n8n
- open sourcelanggenius/dify
Integrity checks
What held up, and what did not.
