What is Sephir used for?

Sephir is a Chrome extension that runs a multi-turn AI agent in every tab, powered by a ChatGPT Plus sign-in or your own API key, with a one-time license. It is a good fit for comparing products across several tabs and repeating weekly web checks as a workflow.

Yes. Sephir has a free plan, and paid plans start at $39 as a one-time payment. A free trial is also available.

Is Sephir open source?

No. Sephir is proprietary (closed-source) software. In the AI Tools category, open-source options include Nanobot, GPT Researcher and LobsterAI.

What are some alternatives to Sephir?

Sephir competes with Perplexity Comet, ChatGPT Atlas and Dia.

Sephir: features, pricing and alternatives

About Sephir

Sephir is a Chrome extension that adds an AI agent layer to the browser. The agent holds multi-turn conversations, calls tools such as extracting page text across tabs, and can click, fill forms, type, navigate and wait, with every call auditable. A demo has it compare three product tabs on price, weight and warranty and return a Markdown table.

It can use the ChatGPT Plus plan you already pay for, via sign-in, or an API key of your own for Claude, Gemini, Mistral and OpenRouter, and is described as local-first. Chats can be saved as workflows with inputs, replayed later and edited in a visual builder with conditions, loops and parallel branches (Pro), with each run recorded in an audit timeline. The site also has a recipes library and comparison pages. A 7-day trial needs no credit card, and the one-time lifetime license is listed at $39.

Key features

AI agent running in every browser tab
Cross-tab tool calls such as page text extraction
Click, fill and navigate actions
Workflows saved from chats with inputs
Works with ChatGPT Plus sign-in or your own API key
Visual workflow builder on Pro

Good fit for

Comparing products across several tabs
Repeating weekly web checks as a workflow

Tags: browser-agent; chrome-extension; ai-agent; automation; chatgpt; workflows

Sephir: questions and answers

What is Sephir used for?: Sephir is a Chrome extension that runs a multi-turn AI agent in every tab, powered by a ChatGPT Plus sign-in or your own API key, with a one-time license. It is a good fit for comparing products across several tabs and repeating weekly web checks as a workflow.
Is Sephir free?: Yes. Sephir has a free plan, and paid plans start at $39 as a one-time payment. A free trial is also available.
Is Sephir open source?: No. Sephir is proprietary (closed-source) software. In the AI Tools category, open-source options include Nanobot, GPT Researcher and LobsterAI.
What are some alternatives to Sephir?: Sephir competes with Perplexity Comet, ChatGPT Atlas and Dia.