Apps similar to SiteLetter include Better Stack, which is free for personal use. Other options are UptimeRobot, Pingdom, HetrixTools and StatusCake. In total there are nine Uptime Monitor Services like SiteLetter for the web, Android, iPhone and iPad.
AI-driven SRE platform offering real-time infrastructure monitoring, incident management, log analytics, traces, error tracking, metrics, real user monitoring, status pages, and a warehouse, with full data ingestion, centralized dashboard, custom alerts, and reduced costs.
United States
Free real-time monitoring for 50 sites every 5 minutes. Custom alerts through email, SMS, calls, and apps like Slack, PagerDuty, and more. Use status pages and mobile apps for easy management.
Slovakia
EU
Tracks uptime, downtime, and page speed with synthetic and real user monitoring, simulates critical flows, analyzes visitor data by location, device, and browser, sends instant alerts, and provides analytics and reporting to troubleshoot and optimize sites.
United States
HetrixTools offers minute-by-minute global uptime monitoring with 15 free monitors, blacklist alerts for IPs and domains, and server resource tracking. Features a user-friendly design, public uptime pages, white label reports, and continuous updates for enhanced functionality.
United States
![(dark mode) Server Resource Monitoring [1]](https://img.alternativeto.net/s/309x197/jpeg/hetrixtools_672860_full.png)
Provides uptime, performance, and page speed monitoring for up to 10 websites. Offers customizable alerts by email, SMS, or third-party apps, root cause analysis, mobile support, server and SSL checks, plus a free plan with detailed reports for diagnostics.
United Kingdom
Screpy is an AI-based web analysis tool that can analyze all pages of your websites in one dashboard and monitor them with your team. It's powered by Lighthouse and it also includes some different analysis tools (SEO, SERP, W3C, Uptime, etc).
Uptime monitoring for freelancers and agencies. Watch client sites and APIs, get downtime emails, track SSL expiry, and share status pages from one dashboard. Free to start, no credit card.
Pakistan
Comprehensive monitoring for uptime, downtime, broken links, SSL certificate status, DNS changes, domain renewals, cron jobs, and application health, with alerts, SEO checks, performance analytics, public status pages, flexible reports, and multi-site support.
BelgiumEU
FlareWarden is uptime monitoring built for small businesses, freelancers, and agencies who need reliable alerts without the complexity of enterprise observability platforms.
United States
![(dark mode) Server Resource Monitoring [1]](https://img.alternativeto.net/s/618x394/avif/hetrixtools_672860_full.png)
