Page changes · TLS expiry
Cloud monitoring for public web pages and TLS certificates. You get a text or visual diff, or an expiry warning, by email. Planned early-access prices are US$14 and US$29 a month. This product is not launched; this page is a waitlist.
Built by a solo engineer, part-time. Keepsight is a working name, not a registered trademark claim.
Price $48$42 · checked 2 minutes ago
TLS expires 25 November 2026 · 12 days left · alert already sent
These are real, public facts — and reasons someone might pay for a monitor. They are not claims about Keepsight’s results, because Keepsight is not launched.
Let’s Encrypt officially ended expiration-notification emails on 4 June 2025. If a certificate is not renewed automatically, you may only find out when a browser warns a visitor.
Source: letsencrypt.org, Josh Aas, 22 January 2025, service ended 4 June 2025.A local extension can watch a page only while the browser is open. Competitor prices, terms, and client sites keep changing after you close the laptop.
Visualping, Distill, Oh Dear and others sell page or site monitoring today. Some users complain about false alerts on noisy banners. We would design around that; we cannot show a false-alert rate we do not have.
A planned first version a solo engineer can actually ship. This is the intended product, not a demonstration of a running service.
Paste a page to watch, or a hostname whose TLS certificate you care about. The first version will not monitor pages behind a login, and will not ask you for someone else’s passwords.
On the paid plans, checks would run even when your computer is off — about every 15 minutes on the planned Starter plan. You can mark noisy regions of a page to ignore (banners, rotating ads).
Email for a meaningful text or visual diff, or when a certificate is 21 days (and again 7 days) from expiry. Slack and Telegram are planned on the higher tier. We will not invent “AI summaries” as a substitute for the actual diff.
These are the prices we want to test — not a live checkout. Nothing will be charged from this page. A later free local browser extension is under consideration; it is not available now, and a local extension would stop when the browser is closed.
Starter
US$14 / month
Standard
US$29 / month
No. This is an early-access waitlist. There is no live service, no paying customers, and no checkout on this page.
Those products already exist, and people already pay them. We would start narrower: public pages plus certificate expiry, with an option to ignore noisy regions of a page, and a lower planned price than Visualping’s business tiers. We do not have users yet, so we cannot claim a better false-alert rate or a larger feature set. Let’s Encrypt itself recommended third-party monitors (including a free Red Sift tier for up to 250 certificates) when it ended its own emails — we are not the only option, and we are not claiming to be.
Not in the first version. Storing other people’s login credentials is a security and legal risk we are not taking on at launch.
A monitor that is down is worse than no monitor. The first version would alert you if checks stop running, but a solo, early product will not have the same operational history as a long-running incumbent. We will say so plainly if we launch.
A solo software engineer, part-time. Payment would go through a merchant-of-record such as Paddle, Lemon Squeezy, or Polar — not through this waitlist form. Stripe Payments is not available for a seller in Taiwan, which is why those alternatives are in view. None of those accounts has been opened for this product yet.
It is planned as a way to try the idea locally. Chrome Web Store in-store payments were discontinued in 2021, so any subscription would still be billed on a website. The extension is not available today, and it would not watch pages while the browser is closed.