StackBest monitoring, errors & logs for solo founders
When your app breaks at 2am, you want to know before your users tweet about it. This category covers three jobs that often get bundled together: error tracking (what crashed and why), logs (what happened before it crashed), and uptime monitoring (is the site even up). As a solo founder you can cover all three for close to $0 if you pick tools with real free tiers and avoid usage-based bills that spike when your app misbehaves.
| Tool | Free tier | Paid from | Best for |
|---|---|---|---|
 Sentry$26/mo | $26/mo | Any solo founder shipping to production; start on the free Developer plan and set client-side sample rates before you ever pay | |
| $25/mo platform fee | Founders who want serious log search and retention for free and are happy pairing it with a separate error tracker | ||
 Better Stack$25/mo for 50 extra uptime monitors | $25/mo for 50 extra uptime monitors | Founders who want fast free uptime checks and a polished public status page without paying anything | |
| Discontinued | Nobody new in 2026; existing users should migrate to LaunchDarkly Observability or switch to Sentry for replay plus errors | ||
 LogSnag$16/mo | $16/mo | Founders who want real-time push notifications for business events (new sale, new signup), as a companion to real monitoring tools | |
 Checkly$24/mo | $24/mo | Founders whose revenue depends on a multi-step flow (signup, checkout) working end to end, not just the homepage loading | |
 UptimeRobot8 euros/mo Solo | 8 euros/mo Solo | Founders who want set-and-forget uptime alerts across many small projects for free |
The solo founder stack here is close to free: Sentry's Developer plan for errors and session replays (its 1-user limit does not matter when you are the only user), Axiom's free 500 GB/mo for logs, and UptimeRobot's 50 free monitors or Better Stack's 10 free monitors with 3-minute checks and a status page. That covers errors, logs, and uptime for $0/mo.
Pay when a limit actually bites: $26/mo for Sentry Team when you outgrow 5k errors, or $24/mo for Checkly Starter once a revenue-critical checkout flow justifies real browser checks. Skip Highlight.io entirely (shut down February 2026) and treat LogSnag as an optional $0-16/mo dopamine layer, not monitoring.
SentryDefault pickFree tierAsk about these tools
The fine print, tool by tool
Sentry$26/mo+
Sentry is an error tracker: it catches exceptions in your app, groups them, and shows you the stack trace and what the user did right before the crash. A solo founder picks it because the free plan covers real production error monitoring and the 1-user limit does not matter when you are the whole team.
$26/mo (Team, annual billing)
Developer plan: 1 user, 5,000 errors/mo, 5 GB logs, 50 session replays, 30-day retention
Listed prices assume annual billing (Business is $80/mo). Free plan is hard-limited to one user. Profiling requires enabling pay-as-you-go. Set spend limits early: overages are usage-based ($0.50/GB extra logs/metrics, $0.78/cron monitor, $1/uptime alert) and an error storm is exactly when they trigger.
- + The free Developer tier's 1-user limit is irrelevant for a solo founder, so you get real error monitoring plus tracing at $0
- + Best-in-class stack traces, source maps, and release tracking for Next.js with a first-party SDK
- + Session replays (50/mo free) let you see exactly what the user did before the crash
- − An error loop can burn 5,000 free events in an hour; on paid plans pay-as-you-go overages kick in (logs/metrics at $0.50/GB) unless you set spend caps
- − The jump from free to Team is $26/mo, which stings if all you exceeded was the error quota by 10%
Axiom$25/mo platform fee+
Axiom is a log and event store: you pipe every log line from your app into it and search them later when something goes wrong. A solo founder picks it because the free plan swallows more log volume than most small products will ever produce, at a fraction of what Datadog charges.
$25/mo platform fee (Axiom Cloud) plus usage
Personal plan: 500 GB/mo ingest, 10 GB-hours/mo query compute, 25 GB storage, 30-day retention, no credit card
Free tier is permanent, no card. Axiom Cloud's $25/mo fee includes 1 TB/mo ingest, 100 GB-hours query, and 100 GB storage; overages average $0.12/GB ingest and $0.183/GB-hour query with automatic volume discounts. The in-console spend limit that pauses instead of bills is the key safety feature.
- + The free tier's 500 GB/mo ingest is absurdly generous; most solo projects never leave it
- + 30-day retention on the free plan beats most competitors' 3-7 days
- + Spending limits pause usage instead of auto-billing, so a log flood cannot surprise-charge you
- − It is logs and events only: no error grouping, session replay, or uptime checks, so you still need Sentry alongside it
- − Paid plan starts with a $25/mo platform fee before any usage, a big step from $0
Better Stack$25/mo for 50 extra uptime monitors+
Better Stack bundles uptime monitoring, a public status page, incident alerting, and log storage in one dashboard. A solo founder picks it for the free 30-second uptime checks and the status page, which together handle the is-my-site-up question at $0.
$25/mo for 50 extra uptime monitors ($21/mo annual); logs bundles from about $30/mo
10 uptime monitors with 3-minute checks, plus 3 GB/mo of logs retained 3 days
Annual billing saves 16% on uptime packs and 22-25% on logs bundles. The trap is the 50-monitor purchase increment and compounding retention charges on logs. Regional pricing means the same Nano logs bundle runs $30-105/mo depending on where your data lives; check the region multiplier before picking a bundle.
- + Free 3-minute checks still beat UptimeRobot's free 5-minute interval; the fastest 30-second checks need a paid plan
- + Free status page and incident management included, so one tool covers on-call basics
- + 10 free monitors cover a typical solo setup: site, API, cron heartbeats
- − Monitor expansion is sold in 50-packs at $25/mo, so needing an 11th monitor costs $25, not $2.50
- − Free log retention is only 3 days, barely enough to debug yesterday's incident
Highlight.ioDiscontinued+
Highlight.io was an all-in-one session replay, error, and log tool that shut down in February 2026 after LaunchDarkly acquired it. Nobody should pick it now; it stays in this list only to flag the shutdown for people following old recommendations.
Discontinued; successor LaunchDarkly Observability is usage-based
Do not sign up. The service is shut down as of February 28, 2026. If you found old comparison posts recommending it, treat them as outdated. Sentry (replays included free) or PostHog cover the same ground today.
- + Was a genuinely good all-in-one: session replay, errors, logs, and traces with a 500-session free tier
- + Open-source core meant you could self-host if the hosted price got out of hand
- + Its team and technology live on inside LaunchDarkly Observability if you already use LaunchDarkly
- − The hosted service was deprecated on February 28, 2026 after the April 2025 LaunchDarkly acquisition; app.highlight.io no longer accepts new data
- − Migration path requires creating a LaunchDarkly account and swapping SDK snippets, which drags you into a feature-flag platform priced for teams
LogSnag$16/mo+
LogSnag sends a push notification to your phone whenever a business event fires: a signup, a payment, a cancellation. A solo founder picks it to feel the pulse of their product in real time, not to monitor anything technical.
$16/mo (Sprout, annual billing; roughly $19/mo monthly)
2,500 events/mo, 3 seats, no credit card
Advertised prices are annual (2 months free, about 17% off). Tiers are event-volume based: 50k events at $16/mo, 150k at $33/mo, 500k at $66/mo, all with unlimited seats. No disclosed overage rates, so assume hard limits or forced upgrades.
- + Purpose-built for the solo founder dopamine loop: push notifications on your phone for signups, payments, and cancellations
- + Setup is one HTTP call per event, minutes to integrate from Next.js API routes or Supabase functions
- + Free 2,500 events/mo is plenty when you only track meaningful business events, not logs
- − It is event tracking, not monitoring: no error capture, no uptime checks, no log search, so it never replaces Sentry or Axiom
- − No published overage policy, so you cannot predict what happens the month you cross 2,500 events beyond being pushed to the $16/mo plan
Checkly$24/mo+
Checkly runs scripted Playwright browser checks against your live site, so it can verify that login and checkout actually complete instead of just pinging a URL. A solo founder picks it when a broken flow, not a down server, is the failure mode that costs revenue.
$24/mo (Starter)
Hobby plan: 10 uptime monitors, 1,000 browser check runs/mo, 10,000 API check runs/mo, 6 locations
Team plan is $64/mo; annual billing discounts apply. Budget by run frequency: browser checks at 5-minute intervals burn about 8,640 runs/mo, which costs real money past the included runs on Starter ($6.50 per extra 1k browser runs, $2.60 per extra 10k API runs). Space browser checks to hourly and lean on cheap API checks to stay near $24/mo.
- + Free tier includes real Playwright browser checks, so you can verify your login and checkout flows actually work, not just that the page returns 200
- + Monitoring-as-code: checks live in your repo and deploy via CLI, which fits a solo dev workflow
- + Free hard cap means you can never be surprise-billed on Hobby
- − Browser check math bites fast: one browser check every 15 minutes is about 2,900 runs/mo, already triple the free 1,000-run cap
- − On Hobby, checks silently stop running when credits run out, which defeats the point of monitoring
UptimeRobot8 euros/mo Solo+
UptimeRobot pings your URLs on a schedule and emails you when one stops responding. A solo founder picks it for the 50 free monitors, which is enough to watch every side project they will ever ship without paying anything.
8 euros/mo Solo (7 euros/mo annual)
50 monitors at 5-minute intervals, 1 basic status page, 3 months data retention
Prices are in euros; annual billing saves about 20% (Team is 34 euros/mo, 29 annual). The free plan's real limits are the 5-minute interval and limited alert channels; SMS/voice alerts consume purchased credits. 14-day money-back guarantee on paid plans. Watch the seat pricing if you later add anyone.
- + 50 free monitors is 5x what Better Stack or Checkly give free, enough for every project you will ever run as a solo founder
- + Dead simple: pings a URL, emails you when it is down, nothing to configure
- + Solo plan at 7-8 euros/mo is the cheapest paid uptime plan in this list
- − Free check interval is 5 minutes, so you can be down 4+ minutes before it even notices; 60-second checks require a paid plan
- − HTTP ping only tells you the page responds, not that login or checkout works; no browser checks at all
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