Agency-shaped monitoring,
not on-call dev tooling
Better Stack is built for on-call SRE teams. If you run an agency, the deliverable your client cares about is the Monday-morning report with their site health, not an on-call rotation. SiteLetter ships that report. Same monitoring shape, different job.
Also evaluating Oh Dear, UptimeRobot, or Pingdom? See those comparisons, or browse all alternatives.
Quick verdict
Both tools are excellent at the jobs they were built for. The decision is about which job you actually need done.
SRE, DevOps, on-call teams running production
Teams that carry a pager. Engineers running production services where someone gets called at 3am when a database goes down. Better Stack ships on-call schedules, escalation policies, voice call alerts, incident merging, postmortem timelines, and full-stack observability (logs, traces, metrics, session replay) in one tool.
Also a strong fit for small teams who can run the entire monitoring stack on Better Stack's free tier (10 monitors, 3-min checks, email and Slack alerts).
Agencies sending monthly client reports
Web design, development, and marketing agencies on retainer. Your client wants to see a recognisable Lighthouse score, evidence that nothing broke this week, and a single email each month that says "everything is healthy." Branded with your agency, not your monitoring vendor.
SiteLetter is priced and shaped for that job. $$5/site covers every monitored page with the full feature set in one flat line - no observability suite billed alongside it, no Playwright scripts to author.
"The AI SRE observability stack. 30x cheaper than Datadog."
"Website monitoring for agencies, delivered by email."
What Better Stack does not ship (that agencies need)
Better Stack ships excellent monitoring, on-call, and observability for engineering teams. The things below are not in the product at any tier, and they are the table-stakes of the agency monthly deliverable.
Lighthouse on monitored pages, not Playwright scripts to author
Better Stack's surface is HTTP/HTTPS uptime checks plus Playwright transaction tests you write yourself in a scripting UI. Lighthouse audits are not in the catalogue at any tier - no Performance, Accessibility, SEO, or Best Practices score for a monitored page. SiteLetter runs Google Lighthouse on every monitored page across every client site, daily, and pre-warms DNS, TLS, and CDN caches before each audit so the score is stable enough to ship in a monthly client deliverable.
Day-over-day screenshot diffs, not session replay
Better Stack ships session replay - "watch a real user click through the site," useful for debugging an incident after the fact. That is a different shape from a daily screenshot of the same page compared against yesterday's. SiteLetter captures one screenshot per monitored page every 24 hours and runs an AI classifier over each diff. A rotating hero, a cookie banner variant, a sale ribbon gets dismissed as cosmetic noise. A real layout break - missing images, a stylesheet 404, a deploy hiding the cart icon - is emailed within the hour.
Reports for clients, not status pages for incidents
Better Stack's client-facing surface is the public status page plus incident-driven subscriber emails: "we are investigating," "we have identified the cause," "the issue is resolved." Useful when something is on fire. Not what an agency forwards on a Monday morning when nothing is on fire. SiteLetter ships a scheduled monthly email in your agency's branding (logo, colour, custom CTA URL, reply-to address), delivered straight to the recipient inbox with no SiteLetter login screen. New external addresses verify ownership once via a one-click link on first send; team members and returning recipients skip the step.
One billing line, not 50-monitor bundles
Better Stack starts at 10 free monitors and scales in 50-monitor bundles at $21/mo annual each. Every URL is a separate monitor: the cart, the contact form, the FAQ, and the top product page on one client site already consume 4. A 5-client portfolio at SiteLetter's per-page coverage shape needs 75 monitors on Better Stack - 2 bundles, $42/mo, and that is still uptime only with no Lighthouse or visual diffing in the bill. SiteLetter is $5/site flat with every monitoring service running daily.
Per-client branding, not per-status-page branding
Better Stack lets you style and put a custom domain on a public status page - useful, but it is the company-running-the-page's branding, not a per-client one. There is no per-recipient logo or reply-to address on the scheduled artifacts, and no org-level toggle that strips the Better Stack name. SiteLetter applies branding per client on every scheduled report: their logo, your reply-to, optionally with the SiteLetter brand stripped entirely.
Setup that ends after the URL
Adding a client to Better Stack is configuring monitors one URL at a time, then per-URL alert thresholds, then incident escalation rules, then a status page if you want one. Adding the same client to SiteLetter is pasting one URL. The sitemap is auto-fetched, the 15 most important pages are picked, every monitoring service turns on, alert rules seed themselves (SSL escalation 30/14/7/3/1 days, domain expiry, uptime retry verification, Lighthouse threshold), and the report template is pre-built.
Feature-by-feature comparison
The full picture, grouped by category. SiteLetter wins on per-page services and agency-shaped reports. Better Stack wins on on-call rotations, channel breadth, and observability bundling. Pick by what your team ships, not by feature count.
| Feature | SiteLetter | Better Stack |
|---|---|---|
| Pricing model | ||
| Pricing unit | 1 site (up to 15 pages) | Per-monitor bundles (10 free + $21/mo annual per additional 50) |
| Cheapest commercial plan | $5/site (15 pages monitored, all services) | Free for first 10 monitors; $21/mo annual per next 50 |
| Free tier | 14-day free trial, 1 site | Permanent free tier (10 monitors, 3-min checks) |
| Free tier ok for client (commercial) work | N/A (trial only) | Yes |
| Per-page services on a client site | ||
| Uptime checking | Homepage every 1 min (3 regions, EU primary + US verifier + AP tiebreaker) + 14 subpages every 15 min | 30-sec to 3-min checks; 1 monitor per URL; 30+ probe locations |
| Google Lighthouse audits (Performance / Accessibility / SEO / Best Practices) | Every monitored page, daily, with cache warmup | Not offered |
| AI visual regression (day-over-day) | Every monitored page, daily, classified | Not offered |
| Broken asset detection | Every monitored page, daily | Not offered |
| Site-level services | ||
| SSL certificate expiry alerts | Yes | Yes |
| Domain expiry alerts | Yes | Yes |
| Sitemap auto-discovery | Yes (weekly sync) | No (every URL added manually) |
| Public status page | Coming soon | Yes (1 included, $12/mo per extra) |
| Multi-step transaction monitoring (Playwright) | No | Yes (priced per Playwright minute) |
| On-call and incident management | ||
| On-call rotation schedules | No | Yes |
| Escalation policies | No | Yes |
| Incident merging and timeline | No | Yes |
| Voice call alerts | No | Yes (unlimited) |
| SMS alerts | No | Yes (unlimited) |
| Reports your clients receive | ||
| Scheduled client-facing email report | Yes (weekly, bi-weekly, monthly, quarterly) | Public status pages + subscriber emails (incident-driven, not scheduled) |
| Per-client branding (logo, color, reply-to) | Yes | Status page styling per page, not per recipient |
| Org-level white-label (hide vendor name) | Yes | No |
| Drag-and-drop report builder | Yes | No |
| Recipients view reports without a login | Yes (new external recipients confirm once; team members skip it) | Public status pages are accessible without login; scheduled report-side delivery is not in the product |
| Channels and platform | ||
| Alert channels | Email, Slack | Voice, SMS, push (native apps), Email, Slack, Teams, Discord, PagerDuty, OpsGenie, webhooks, Zapier, REST API, Terraform |
| Public REST API | Coming soon | Yes |
| Native mobile app | No | Yes (iOS, Android, push) |
| Logs / traces / metrics / session replay | No | Yes (bundled observability) |
| Monitoring data retention | 2 years (730 days) across all monitoring data | Uptime: not published; logs/traces 30 days (paid bundles); error tracking 90 days; session replay 90 days |
Sources: betterstack.com/uptime/pricing, betterstack.com/uptime, betterstack.com/pricing. Verified .
Cost at your portfolio size
Drag the slider to your client portfolio size. Numbers update live. Better Stack's free tier (10 monitors) plus 50-monitor bundles at $21/mo annual scale per additional bundle.
Better Stack pricing in USD annual rate, sourced from their public pricing page. Does not include responder seats ($29/mo each for uptime + telemetry access), extra status pages ($12/mo each beyond the first), Playwright transaction minutes, or Logs/Telemetry bundles which are billed separately.
Reading these numbers honestly
Better Stack wins on homepage-only cost at small scale. 10 client sites at homepage uptime fit in their free tier ($0/mo). SiteLetter at that size is $50/mo. If your monitoring need is genuinely "is the homepage up," Better Stack is free where SiteLetter is paid.
SiteLetter wins on per-page coverage and what is included. Lighthouse on every monitored page, AI visual regression, and branded client reports are in the SiteLetter price. Matching them on Better Stack means assembling a stack: Better Stack for uptime + on-call, plus a separate Lighthouse tool, plus a separate visual regression tool, plus a custom report pipeline. The cost calculator above only counts Better Stack's monitor billing; the assembled stack is meaningfully more.
Cost at common portfolio sizes
"Matching coverage" assumes one uptime monitor per page (the shape required to get Better Stack's per-URL visibility on inner pages of each client site). Better Stack column does not include Lighthouse, visual regression, or branded client reports because those are not in the product.
| Client sites | SiteLetter | Better Stack: matching coverage (15 monitors/site) | Better Stack: homepage only (1 monitor/site) |
|---|---|---|---|
| 5 | $25/mo | $42/mo | $0/mo |
| 10 | $50/mo | $63/mo | $0/mo |
| 20 | $100/mo | $126/mo | $21/mo |
Source: betterstack.com/uptime/pricing, verified .
Where Better Stack genuinely wins
Better Stack is a strong, modern, well-funded product (Series A led by Creandum, with Susa Ventures and others participating, plus a follow-on round; roughly $28M raised across two rounds), shipping fast and engineered well. If your team operates production infrastructure, runs an on-call rotation, or needs full-stack observability (logs, traces, metrics) in one vendor, Better Stack is the better tool today. The wins below are real and SiteLetter does not currently match them.
On-call schedules and escalation policies
Better Stack ships PagerDuty-class on-call: rotation schedules, escalation policies, smart incident merging, voice call alerts, and an incident timeline for postmortems. If your team carries a pager for client infrastructure, this is the entire reason to pick Better Stack.
30+ probe regions + 30-second intervals
Better Stack probes from 30+ locations worldwide at 30-second intervals on every paid tier. SiteLetter confirms any down result across 3 AWS regions (EU primary + US verifier + AP tiebreaker, with all data stored in EU) on a flat 1-min cadence. If you need 30+ vantage points for geographic diversity or sub-minute uptime resolution for production infrastructure, Better Stack wins on both raw count and frequency.
Full-stack observability in one vendor
Better Stack bundles Playwright-based multi-step transaction checks, log management, traces, metrics, session replay, and an AI SRE feature. If your team wants logs and traces in the same dashboard as uptime, that is a real consolidation win.
For SRE teams, DevOps teams, on-call ops engineers, and any infrastructure-side observability need, Better Stack remains the better tool today. We say that here because we mean it.
When to pick which
Three honest scenarios.
Agencies, any size
From your first client to your fiftieth. Lighthouse on every monitored page, AI visual regression, branded reports, and the recipient flow are designed for the agency job: making monitoring a deliverable clients can see. SiteLetter is one tool, $5/site, with the full agency feature set in the base price.
SRE / DevOps team on-call
Production infrastructure with on-call rotations, escalation policies, and incident response. Better Stack ships on-call schedules, voice call alerts, incident merging, postmortem timelines, and full-stack observability. SiteLetter does not.
Agency that also runs infrastructure
Some agencies are also their clients' hosting / DevOps provider. Better Stack free tier for the on-call piece (homepage uptime, escalation), SiteLetter at $5/site for the per-page Lighthouse / visual / branded client reports. The two products do not overlap; the split is honest.
SiteLetter vs Better Stack: FAQ
No. Better Stack Uptime monitors HTTP/HTTPS endpoints with synthetic checks (uptime, response time, SSL, DNS) and runs Playwright browser tests for transaction flows. It does not run Google Lighthouse audits on monitored pages, so there are no Performance, Accessibility, SEO, or Best Practices scores in the product. SiteLetter audits every monitored page on every site daily with cache warmup, and the Lighthouse scores ship in the weekly client report.
No. Better Stack does not screenshot pages once a day and diff them against yesterday's screenshots. SiteLetter takes a daily screenshot of every monitored page, diffs it against the previous day, and uses AI to classify each diff as noise (rotating banners), intentional updates (logged in the weekly report), or real breakage (missing images, layout collapse, emailed immediately).
Better Stack ships status pages (1 included, additional pages $12/mo) and incident-management dashboards your team uses internally. It does not ship a scheduled, per-client branded email report with your agency logo, brand color, custom reply-to address, and a one-click recipient confirmation flow. SiteLetter is built around that flow: weekly, bi-weekly, monthly, or quarterly reports, per-client branding, optional org-level white-label that hides "SiteLetter" from clients entirely.
Better Stack has a generous free tier (10 monitors with 3-min checks) and bundles features by add-on. Paid scaling is $21/mo annual per additional 50 monitors, plus $29/mo per responder seat for uptime + telemetry access, plus $12/mo per extra status page. For an agency on 20 client sites at homepage-only uptime, Better Stack can be cheaper than SiteLetter. For per-page coverage (15 pages per site, so 300 monitors at 20 sites), Better Stack's monitor bundles add up and you still do not get Lighthouse, visual regression, or branded reports out of the box, so you would also need a separate Lighthouse tool, a separate visual regression tool, and a custom report pipeline.
On-call and incident management. Better Stack ships on-call schedules, escalation policies, smart incident merging, voice call alerts, SMS, Slack/Teams/Discord/PagerDuty/Opsgenie integrations, and an incident timeline for postmortems. SiteLetter has email and Slack alerts and no on-call rotations. Better Stack also has Playwright-based transaction monitoring with full Chrome, 30+ probe locations with 30-second intervals, public REST API, native iOS and Android mobile apps, status pages with subscriber email updates, and Logs/Telemetry/Session Replay as bundled products. SiteLetter does multi-region probing too (3 regions: EU primary + US verifier + AP tiebreaker, all data stored in EU) on a flat 1-min cadence, but at fewer vantage points than Better Stack. If your team is on-call for client infrastructure or you need PagerDuty-style incident response, Better Stack is the better tool today.
Per-page Google Lighthouse on every monitored page daily with DNS/TLS/CDN cache warmup (Better Stack does not run Lighthouse audits as a first-class product). AI day-over-day visual regression that classifies each diff as noise / intentional / breakage (Better Stack monitors uptime and incidents, not pages). Branded scheduled per-client email reports with per-client logo, brand color, reply-to, and a one-click confirm flow for new external recipients (Better Stack email is incident alerts, not scheduled per-client deliverables). Sitemap auto-discovery: add a domain, SiteLetter picks the 15 most important pages and seeds monitoring rules (Better Stack is per-monitor manual). $5/site flat for up to 15 pages, every service.
Yes, and several agencies do exactly this. Better Stack on the free tier (10 monitors) for the homepage-level uptime / SSL / on-call piece, plus SiteLetter at $5/site for the per-page Lighthouse, visual regression, and branded client reports. The two products do not overlap meaningfully: Better Stack covers DevOps-side observability, SiteLetter covers the agency-deliverable client side. The split is honest, not a fudge.
Better Stack has raised roughly $28M across two rounds (Series A led by Creandum, with Susa Ventures and others participating, plus a follow-on Kaya VC round), ships fast, and has a stunning product. SiteLetter is focused on a narrower audience: agencies. The competitive position is not about resources, it is about audience. Better Stack optimises for SRE / DevOps / on-call teams running production infrastructure; SiteLetter optimises for agencies sending monthly client reports. Each product is the better choice for its own audience. If Better Stack shipped visual regression and branded agency reports tomorrow that would be a real threat; today they are not building toward that market.
Yes, and the SiteLetter setup is shorter. Each SiteLetter site covers up to 15 pages automatically (sitemap-discovered and ranked by depth, sitemap priority, and recency), so a 100-monitor Better Stack setup typically collapses into 7-10 SiteLetter sites. Add each unique site once and SiteLetter handles the rest: page selection, every monitoring service enabled, smart alert rules seeded, weekly and monthly client report templates pre-built. The 14-day free trial includes one site so you can validate the full experience on one client site before bringing the rest over.
Still have questions? Contact us
Comparison based on publicly available Better Stack pricing and feature documentation, last verified . Better Stack is a trademark of Better Stack, Inc., used here for identification and comparison purposes only. SiteLetter is independent and not affiliated with, sponsored by, or endorsed by Better Stack. For the most current Better Stack pricing and feature information, see betterstack.com.
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SiteLetter is the kind of tool you forget you're using, until your client thanks you for the report you didn't write.
- ✓ 2-minute setup. Add a URL. We auto-discover pages, seed alerts, schedule reports.
- ✓ No scripts to install. We monitor from the outside, like a real visitor.
- ✓ Cancel anytime. No credit card to start, no contract.