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Best app monitoring tools for startups

Matt Turley, Continuum. Updated 2026-11-05.

We sell Continuum Keep it running, so we say where the other options fit better. Links to other companies go to their own sites and carry no affiliate codes.

The short answer

Best app monitoring tools for startups

No single monitoring tool is best for everyone. Better Stack suits small teams that want uptime checks, on-call alerts and error tracking from one vendor. Datadog suits teams running multiple hosts that want one platform across infrastructure, APM and logs; per-host pricing makes it harder to estimate for very small apps. Grafana Cloud suits teams that already use Grafana dashboards or open-source Prometheus and Loki. New Relic suits teams whose monthly data volume stays within its free allowance and who need one full user. Three more are covered below. The list is alphabetical and is not a ranking.

How we picked and ordered these

This covers tools a small team uses to learn that an app is down or throwing errors. We only feature a tool when a page owned by the vendor backs our description of it, and we leave out products that have shut down.

We do not rank them. Each entry says what the sources report, where it falls short, and who it suits, so you can match one to your own situation. Where a competitor of ours is the better fit, we say so.

We read each source on 2026-11-05. Prices and limits change often, so confirm on the vendor's own page before you buy. A figure marked "one source only" was not matched by a second publisher.

At a glance

At a glance. Alphabetical order, not a ranking. Prices are as reported in the cited sources.
At a glance. Alphabetical order, not a ranking. Prices are as reported in the cited sources.
ToolWhat it isConfirmed priceSuits
Better StackUptime monitoring, logs and error trackingFree $0 [1]; Responder seat $34 per month billed monthly; $29 per month billed yearly [1]Small teams that want uptime checks, on-call alerts and error tracking from one vendor
DatadogFull-stack observability platformInfrastructure Pro $15 per host per month billed annually; $18 on demand [2]; APM (with Infrastructure attached) $31 per host per month billed annually; $36 on demand [2]Teams running multiple hosts that want one platform across infrastructure, APM and logs; per-host pricing makes it harder to estimate for very small apps
Grafana CloudManaged observability stack (metrics, logs, traces)Free $0 [3]Teams that already use Grafana dashboards or open-source Prometheus and Loki
New RelicFull-stack observability platformFree $0 [4]; Standard overage $0.40 per GB beyond 100 GB (sources also show $0.35 and $0.30) [5]Teams whose monthly data volume stays within its free allowance and who need one full user
PostHogProduct analytics with session replay and error trackingFree allowance (monthly) $0 [6]; Usage above free $0.005 per recording after the first 5k [7]Teams that want product analytics, replay and error tracking under one usage-based bill
SentryError tracking and application performance monitoringDeveloper $0 [8]; Team $26 per month billed annually; $29 per month billed monthly [8]Teams that want error tracking with usage-based overage billing
UptimeRobotUptime monitoringFree $0 [9]; Enterprise no published price [9]Small sites that need basic uptime checks and a larger free monitor count
Continuum Keep it running (ours)Managed monitoring and patchingKeep it running $500/mo [10]A founder who wants someone else to watch the app and respond when it breaks

The monitoring tools, one by one

Better Stack

Better Stack combines uptime monitoring, status pages, incident alerting, logs, traces, error tracking and session replay in one product.[1]

Limits and things to check:

  • The free plan includes 10 monitors and heartbeats and 1 status page.[1]
  • The free plan includes 100,000 exceptions per month for error tracking.[1]
  • Exceptions beyond the included amount are charged per exception at a rate that depends on region: $0.000050 in Europe, $0.000075 in the United States and $0.000175 in Singapore.[1]
  • Third-party sources disagree on the free-tier check interval (one guide says 3 minutes) and the official page was not seen to state an interval in these results.[11] One source only.

Pricing as reported for Better Stack:

  • Free: $0 [1]
  • Responder seat: $34 per month billed monthly; $29 per month billed yearly (Unlimited phone and SMS alerts; team members with telemetry access are free) [1]
  • Extra uptime monitors: $25 per month for 50 monitors; $21 per month on yearly billing (Add-on to the free plan allowance) [12]

Plan limits are longer than fit here and some sources disagree on them, so read the limits on the vendor pricing page.

Suits small teams that want uptime checks, on-call alerts and error tracking from one vendor. That is our reading of the facts above, not something a source says.

Datadog

Datadog is a monitoring platform sold as separate per-host and usage-based products such as Infrastructure Monitoring and APM.[2]

What the sources say:

  • The pricing page lists Infrastructure Pro at $15 per host per month billed annually, or $18 on demand.[2]
  • The pricing page lists APM at $31 per host per month with Infrastructure Monitoring attached (billed annually), and its FAQ gives standalone prices of $36 for APM, $41 for APM Pro and $47 for APM Enterprise.[2]
  • The APM billing documentation lists $31 per underlying APM host per month and $35 for APM Pro.[13]

Limits and things to check:

  • Per a third-party summary, every billable APM host requires Pro or Enterprise Infrastructure Monitoring, so a traced host costs roughly $46 per month on the Pro path.[14] One source only.
  • Per a third-party summary, hosts are counted at the peak for the month after discarding the top 1 percent of hours.[14] One source only.

Pricing as reported for Datadog:

  • Infrastructure Free: $0 (5 hosts, 1-day retention (third-party reported)) [14] One source only, so confirm it on the vendor page.
  • Infrastructure Pro: $15 per host per month billed annually; $18 on demand (Per host, per month) [2]
  • APM (with Infrastructure attached): $31 per host per month billed annually; $36 on demand (Requires Infrastructure Monitoring on the host; standalone APM is $36 per host per month billed annually) [2]

Suits teams running multiple hosts that want one platform across infrastructure, APM and logs; per-host pricing makes it harder to estimate for very small apps. That is our reading of the facts above, not something a source says.

Grafana Cloud

Grafana Cloud is Grafana Labs' hosted observability platform for metrics, logs, traces and dashboards.[3]

Limits and things to check:

  • The free tier is limited to 10k active series per month with 14 days retention, and 50 GB of logs ingested per month with 14 days retention.[3]
  • A Grafana community forum post says usage exceeding the Free plan ingestion limits will be discarded.[15]
  • Several third-party sites list 3 users on the free tier; this was not found on Grafana's own page in these results.[16] One source only.

Pricing as reported for Grafana Cloud:

  • Free: $0 (10k active series per month, 50 GB logs ingested per month, 14-day retention) [3]

Suits teams that already use Grafana dashboards or open-source Prometheus and Loki. That is our reading of the facts above, not something a source says.

New Relic

New Relic is an observability platform with a usage-based model priced on data ingest and users.[4]

Limits and things to check:

  • The free tier is perpetual and includes 100 GB of ingest per month and one full platform user.[4]
  • New Relic sends an alert at 85 percent of the 100 GB cap, and ingest stops past 100 GB until you upgrade or the month resets.[5]
  • Overage rate beyond the free 100 GB is shown as $0.40 per GB on the info page, $0.35 per GB on one pricing-page snapshot and $0.30 per GB on another; these conflict.[5]

Pricing as reported for New Relic:

  • Free: $0 (100 GB data ingest per month, one full platform user, unlimited basic users, no credit card needed) [4]
  • Standard overage: $0.40 per GB beyond 100 GB (sources also show $0.35 and $0.30) (Original data beyond the free 100 GB; additional full platform users $99 per month each, up to five, per New Relic info page) [5]

Suits teams whose monthly data volume stays within its free allowance and who need one full user. That is our reading of the facts above, not something a source says.

PostHog

PostHog is a product analytics platform that also offers session replay, error tracking and feature flags, with usage-based pricing.[6]

What the sources say:

  • The free allowance is the same whether or not a card is on file, and the free plan has no time limit.[6]

Limits and things to check:

  • The free session replay allowance is 5,000 recordings per month; a 2026 teardown says it dropped from 15K to 5K, so older 15K figures are outdated.[6]
  • PostHog's error tracking page says the product is free up to 100,000 exceptions.[17]
  • Free-plan session replay recordings are kept for 3 months.[6]

Pricing as reported for PostHog:

  • Free allowance (monthly): $0 (5,000 session replay recordings, 100,000 error tracking exceptions, 2,500 mobile recordings per month; resets monthly) [6]
  • Usage above free: $0.005 per recording after the first 5k (Session replay overage) [7]

Suits teams that want product analytics, replay and error tracking under one usage-based bill. That is our reading of the facts above, not something a source says.

Sentry

Sentry captures errors and performance data from applications, with session replay, logs and metrics available on its paid plans.[8]

What the sources say:

  • Team is $26 per month when billed annually and Business is $80 per month when billed annually, with default pre-paid data.[8]
  • On monthly billing, Team is $29 per month and Business is $89 per month.[18]

Limits and things to check:

  • Usage above the included quota is billed at pay-as-you-go rates; the Team rate for the 50K to 100K error band is $0.0003625 per error, and the Business rate for the same band is $0.0011125 per error.[8]
  • Pre-purchasing (reserved) volume is about 20 percent cheaper than pay-as-you-go, and unused reserved volume expires monthly.[19] One source only.
  • The free Developer plan is limited to one user and a 5k error quota.[8]

Pricing as reported for Sentry:

  • Developer: $0 (5k errors per month, one user) [8]
  • Team: $26 per month billed annually; $29 per month billed monthly (50K errors, 5M spans, 50 replays, 5GB logs per month included; usage above quota billed pay-as-you-go) [8]
  • Business: $80 per month billed annually; $89 per month billed monthly (Same base quotas as Team (50K errors, 5M spans, 50 replays); adds SAML and SCIM, advanced quota management, unlimited custom dashboards) [19]

Suits teams that want error tracking with usage-based overage billing. That is our reading of the facts above, not something a source says.

UptimeRobot

UptimeRobot checks websites and services at set intervals and sends alerts and status pages when they are down.[9]

What the sources say:

  • Annual billing saves about 15 percent on Team and Scale compared with monthly billing, per the pricing page.[9]

Limits and things to check:

  • The free plan is described as 50 monitors with 5-minute checks and no credit card required.[9]
  • Sources disagree on Team check interval (30 seconds on the pricing page and homepage FAQ, 60 seconds in a knowledge-hub article).[9]
  • Sources disagree or give a range for the Solo price: from 10 EUR per month (10 monitors) or from 22 EUR per month (50 monitors); another UptimeRobot page lists $9 per month billed annually. 60-second checks.[9]
  • Sources disagree or give a range for the Team price: from 41 EUR per month (100 monitors); another UptimeRobot page lists $35 per month billed annually; a 2026 third-party guide lists $46 per month. 30-second checks per pricing page; a knowledge-hub article and an older page say 60 seconds.[9]
  • Sources disagree or give a range for the Scale price: from 77 EUR per month (200 monitors) or from 179 EUR per month (500 monitors). 15-second checks.[9]

Pricing as reported for UptimeRobot:

  • Free: $0 (50 monitors, 5-minute checks) [9]
  • Enterprise: no published price (Quoted per engagement) [9]

Suits small sites that need basic uptime checks and a larger free monitor count. That is our reading of the facts above, not something a source says.

How to choose a monitoring tool

Start from your situation, not from the list:

  • For small teams that want uptime checks, on-call alerts and error tracking from one vendor, start with Better Stack.
  • For teams running multiple hosts that want one platform across infrastructure, APM and logs; per-host pricing makes it harder to estimate for very small apps, start with Datadog.
  • For teams that already use Grafana dashboards or open-source Prometheus and Loki, start with Grafana Cloud.
  • For teams whose monthly data volume stays within its free allowance and who need one full user, start with New Relic.
  • For teams that want product analytics, replay and error tracking under one usage-based bill, start with PostHog.
  • For teams that want error tracking with usage-based overage billing, start with Sentry.
  • For small sites that need basic uptime checks and a larger free monitor count, start with UptimeRobot.

Open the vendor pricing page for your shortlist before you decide, since plans change.

Where Continuum fits

We make Continuum Keep it running. Weigh what we say here with that in mind. The tools above are the better choice when you want software you run yourself; ours is the better choice when you want a person to do or read the work.

Continuum Keep it running (ours)

A monthly retainer where a person handles monitoring, security and dependency patching, and incident triage for an app.[10]

What our own page says:

  • It is a service with a person in the loop, not a self-serve monitoring product.[10]

Limits and things to check:

  • It does not replace an error tracker or uptime tool you want to read yourself.[10]

Pricing as reported for Continuum Keep it running:

  • Keep it running: $500/mo (Keep-alive level) [10]

Suits a founder who wants someone else to watch the app and respond when it breaks.

Details on Continuum Keep it running.

Know what breaks first

Monitoring tells you after a failure. A pre-launch review tells you what is likely to fail. See the Ship Check
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FAQ

Straight answers

Which of these have a free plan?
Better Stack, Datadog, Grafana Cloud, New Relic, PostHog, Sentry and UptimeRobot have a free plan or free tier according to the sources we read. Limits differ, so check each one.
Is this list a ranking?
No. It is alphabetical. Which monitoring tool fits depends on your team, your budget and the problem you are solving.
When were these sources read?
All sources on this page were read on 2026-11-05. Prices and limits change, so confirm on the vendor page before you buy.
Keep reading
Best error tracking toolsbest error tracking toolsSentry vs Datadogsentry vs datadogSentry vs Rollbarsentry vs rollbarAll comparisonsBest of lists, head to heads and alternatives across every area we cover.
Sources
  1. 1. Better Stack pricing, Better Stack, 2026-11-05: Better Stack's own page
  2. 2. Datadog pricing, Datadog, 2026-11-05: Datadog's own page
  3. 3. What's included in Grafana Cloud Free, Grafana Labs, 2026-11-05: Grafana Cloud's own page
  4. 4. New Relic free tier, New Relic, 2026-11-05: New Relic's own page
  5. 5. New Relic pricing info, New Relic, 2026-11-05: New Relic's own page
  6. 6. PostHog pricing, PostHog, 2026-11-05: PostHog's own page
  7. 7. PostHog trial page, PostHog, 2026-11-05: PostHog's own page
  8. 8. Sentry pricing page, Sentry, 2026-11-05: Sentry's own page
  9. 9. UptimeRobot pricing, UptimeRobot, 2026-11-05: UptimeRobot's own page
  10. 10. Continuum Keep it running on uxcontinuum.com, Continuum, 2026-11-05: Continuum Keep it running's own page
  11. 11. Better Stack pricing guide details (Modern Datatools), Modern Datatools, 2026-11-05: third-party page
  12. 12. Better Stack uptime pricing, Better Stack, 2026-11-05: Better Stack's own page
  13. 13. Datadog APM Billing, Datadog, 2026-11-05: Datadog's own page
  14. 14. Datadog Pricing 2026 (Activepieces), Activepieces, 2026-11-05: third-party page
  15. 15. Grafana community: exceeding Free plan limits, Grafana Labs, 2026-11-05: Grafana Cloud's own page
  16. 16. Grafana Cloud free tier directory entry, freetier.co, 2026-11-05: third-party page
  17. 17. PostHog error tracking, PostHog, 2026-11-05: PostHog's own page
  18. 18. Provision Sentry from the Stripe Projects CLI (monthly prices), Sentry, 2026-11-05: Sentry's own page
  19. 19. Sentry Pricing: Team vs Business Plans and Overage Costs, Zapro, 2026-11-05: third-party page
Best app monitoring tools for startups | Continuum