400,000 users · Honest comparison
Sephir vs HARPA AI.
Sidebar + automation engine wrapping ChatGPT, Claude, Gemini, DeepSeek behind a monthly subscription. ~400K weekly users. Below: what HARPA AI users actually say, and how Sephir is built around the opposite incentives.
From HARPA AI’s Chrome Web Store reviews
What real users actually said.
- “Scam - you use your OWN AI API key and after 50 "uses" they charge you LOL.”
- “£14 per month to use my own ChatGPT subscription after the first 50 messages, no thanks.”
- “Previously, we had daily summaries that didn't consume any tokens, but now anything requires payment. There's nothing clear about what's free and what's paid.”
- “Why does this extension need access to all information on all sites all the time in order to work? Google please investigate this company, this seems really sketchy.”
How Sephir is different
Built around the opposite incentives.
- 01BYOK is unmetered. Keys live in local extension storage; requests go direct to your provider — Sephir never sits on top of your token bill.
- 02Buy the feature set you see — no later paywall flips. Polar-backed refund within 30 days.
- 03Real agent loop with a visible audit timeline. Every tool call, every retry, shown step-by-step — not a console dump.
- 04No overlay ads on third-party sites. Content tools target the active tab on explicit user action only.
Try it free
The agent layer for the browser, without the auto-renew.
Free tier covers BYOK + single-turn chat. Pro Lifetime unlocks the agent loop, $39 for the first 500 buyers, one-time payment.