ChangeGist

ChangeGist watches the web pages you care about and emails you a short, plain-English summary when something changes, like a price, a stock level or a policy. No more squinting at red and green diffs: alerts say things like "Price went up from £24 to £28" or "New product added", with the old and new values side by side. It skips noise like dates, times and visitor counters, so you only hear about real changes. Alerts by email on every plan, plus Slack, Discord and webhooks on Pro. Plans from £19 / $24 a month with a 7-day free trial.