Baselime vs JustAnalytics: Serverless-Native Observability or a Full-Stack Script
Serverless observability showdown. Backend traces vs full-stack replay. One choice defines your debugging.
Last November I shipped a checkout flow on Vercel. Serverless functions. Edge middleware. The whole modern stack. Users started reporting random timeouts — but only sometimes, and only on certain products.
Debugging serverless is a special kind of frustrating.
No persistent server to SSH into. No process to attach a debugger to. Just invocation logs scattered across a dashboard, cold start metrics that may or may not correlate with the actual timeout, and a growing suspicion that the bug only happens at scale. I burned two days on this. Two days I'll never get back.
That week I tested both Baselime and JustAnalytics. Baselime because serverless is literally their whole thing. JustAnalytics because I was already paying for too many observability tools and wanted to consolidate.
Here's what I learned: these platforms overlap less than you'd expect. Baselime is a serverless-native backend tracing tool — it instruments Lambda, Cloudflare Workers, Vercel Functions, and similar compute. JustAnalytics is a frontend-first consolidation platform — it bundles analytics, session replay, errors, APM, and uptime into one browser script. They solve different problems. Sometimes you need both. Sometimes one does the job. Let me break it down.
Quick Verdict
TL;DR: Baselime wins on serverless backend depth. JustAnalytics wins on frontend coverage and tool consolidation.
If you're running Lambda functions, Cloudflare Workers, or Vercel serverless and your main headache is cold starts, function timeouts, or distributed tracing across serverless invocations — Baselime was purpose-built for that. Their team obsessed over the specific challenges of serverless: ephemeral compute, invocation-based pricing, the lack of traditional APM hooks. And since Cloudflare acquired them in April 2024, the Workers integration is particularly tight.
If your stack includes a browser frontend and you need session replay, web analytics, and uptime monitoring alongside error tracking — JustAnalytics covers more surface area. You won't get Baselime's serverless-specific depth, but you'll get a single under-5KB script that replaces GA4 plus Sentry plus Pingdom plus LogRocket.
The honest question: Where do your bugs live? If they're in Lambda cold starts and function execution, Baselime. If they're in checkout flows where you need to see what users clicked before the error, JustAnalytics.
Feature Comparison
| Feature | JustAnalytics | Baselime (Cloudflare) |
|---|---|---|
| APM / performance monitoring | Yes (OpenTelemetry-native, P95/P99, service maps) | Yes (serverless-native, invocation traces, cold start metrics) |
| Error tracking | Yes (source-mapped stacks, issue grouping, rage-click detection) | Yes (function errors with invocation context) |
| Session replay | Yes (pixel-perfect DOM replay with privacy masking) | No |
| Web analytics | Yes (pageviews, funnels, UTM, cohorts, attribution) | No |
| Uptime monitoring | Yes (HTTP checks, SSL, status pages, cron alerts) | No |
| Structured logs | Yes (ingestion, filtering, alerting) | Yes (log aggregation, querying, OpenTelemetry) |
| Lambda / serverless depth | Via OpenTelemetry (manual setup) | Native (auto-instruments Lambda, Workers, Vercel) |
| Cloudflare Workers depth | Via OpenTelemetry | Native (deep integration since acquisition) |
| Frontend JavaScript | Yes (under-5KB script, Web Vitals, errors) | Minimal (focus is backend functions) |
| Free tier | $0/mo — 100K events, 1 site, 6mo retention | Free for Cloudflare Workers users (post-acquisition) |
| Paid starting plan | Pro $49/mo — 1M events, 5 sites, all features | Varies by provider; Workers included free |
| OpenTelemetry support | Native | Native |
The shapes are fundamentally different. Baselime goes deep on serverless backend compute — they understand Lambda's execution model, Workers' isolate architecture, the specific pain points of ephemeral infrastructure. JustAnalytics goes wide on frontend surfaces — replay, analytics, browser-side coverage that Baselime doesn't attempt.
Where Baselime Wins: Serverless Backend Depth
Baselime started with a simple thesis: observability for serverless is broken. Traditional APM tools assume long-running processes you can attach agents to. Lambda functions spin up, execute, and die in milliseconds. The mental model doesn't transfer.
Serverless-native instrumentation. Baselime auto-instruments AWS Lambda, Cloudflare Workers, Vercel Functions, and similar platforms without manual code changes. Add a layer (for Lambda) or enable the integration (for Workers), and traces start flowing. Cold start timing. Invocation duration. Memory usage per execution. The metrics that actually matter for serverless cost and performance.
Invocation-centric debugging. When a function fails, you see the specific invocation — input, output, logs, trace — in context. Not "function X had 47 errors today" but "this specific invocation at 14:32:07 with this input failed with this stack trace." The difference matters when you're debugging intermittent failures.
Cloudflare integration is exceptional. Since Cloudflare acquired Baselime in April 2024, Workers observability is built into the Cloudflare dashboard. No separate login. No additional billing. If you're already on Workers, Baselime's functionality comes free. That's a significant value proposition.
Log aggregation that understands serverless. Serverless logs are scattered by design — each invocation is independent. Baselime correlates them by request ID, trace ID, and timing. Query across thousands of invocations with the same ease as tailing a monolith's logs.
OpenTelemetry-native. They don't fight the standard. Export OTel traces to Baselime, query them with their tooling. If you're already instrumenting with OpenTelemetry, it just works. Teams using AI agents for DevOps can explore how DevOS integrates with observability pipelines.
If your primary problem is "why is my Lambda timing out" or "why are my Workers cold starts so slow," Baselime was built for exactly that.
Where JustAnalytics Wins: Frontend Coverage and Consolidation
Baselime's gap is the browser. They don't pretend otherwise — their landing page says "serverless observability" not "full-stack observability." If your bug is in a React component, Baselime shrugs.
Session replay is the big differentiator. When a user reports "checkout broke," the ideal workflow is: find the error, click into the session, watch what they did. Baselime gives you backend traces. JustAnalytics gives you the DOM replay too. Pixel-perfect recording with privacy masking. Rage-click detection. When the support ticket says "I can't describe what happened," you don't need them to — you can watch. We covered GDPR-compliant session replay practices for teams handling PII.
Web analytics bundled. Pageviews. Conversion funnels. Cohort retention. Attribution. UTM tracking. One dashboard correlates "user landed from Google Ads, hit product page, started checkout, error on payment step, abandoned." Baselime sees the Lambda invocation that processed the failed payment. JustAnalytics sees the whole journey. If your team runs paid acquisition, ClickzProtect handles click fraud detection with the same event-correlation approach.
Five tools in one script. Analytics (replaces GA4), error tracking (replaces Sentry for frontend), APM (replaces basic Datadog), session replay (replaces LogRocket), uptime (replaces Pingdom). The consolidation math matters: paying for five separate tools means five dashboards, five logins at 3am, five billing relationships to manage.
Look, I'm biased. I work on this thing. But even before I joined the team, the five-login problem drove me crazy. I had Datadog open in one tab, Sentry in another, GA4 in a third, and by the time I found the relevant event in each, the incident was over.
The script is under 5KB. Serverless teams obsess over bundle size and cold starts. Adding a 200KB analytics SDK defeats the purpose. JustAnalytics keeps it minimal. For teams tracking this against GA4, see our observability tool consolidation guide.
OpenTelemetry backend support. We don't have Baselime's auto-instrumentation for Lambda — but we accept OpenTelemetry traces. If you're already exporting OTel from your functions, point them at our endpoint. Not as turnkey as Baselime's native integrations. But it works across any language OTel supports. Check our Cloudflare Workers integration guide for the edge-specific setup.
The Serverless Stack Question
Here's the thing nobody says out loud: most "serverless" apps are hybrids.
You've got Lambda functions or Workers handling API routes. You've got a Next.js or Nuxt frontend doing SSR and client-side rendering. You've got databases (probably not serverless — Neon and Planetscale are catching up but most teams still run RDS or Supabase). You've got third-party APIs you don't control. You've got a CDN. You've got... a lot.
Pure serverless backend teams: Your bugs live in function execution. Cold starts. Memory limits. Invocation costs. Baselime's serverless-native approach matters more than frontend replay. If you've already got GA4 for marketing and Sentry for browser errors, adding Baselime for backend observability makes sense.
Frontend-heavy serverless teams: Your bugs live in the browser as much as the backend. Session replay and analytics matter. Baselime's Lambda traces help less when the issue is "users get confused by the UI and abandon." JustAnalytics covers the frontend story that Baselime doesn't touch.
Full-stack teams wanting consolidation: You need both perspectives. Do you want best-in-class serverless APM (Baselime) plus separate frontend tools (LogRocket, GA4, Pingdom), or consolidated coverage (JustAnalytics) that handles frontend well and backend adequately via OpenTelemetry?
One dashboard at 3am beats four.
But specialized tools exist for a reason. And honestly? If my entire stack was Cloudflare Workers, I'd probably just use Baselime and call it a day. It's free. It's native. Sometimes the best tool is the one that does one thing really well.
Pricing Reality (August 2026)
JustAnalytics:
- Free: $0/mo — 1 site, 100K events/mo, 6mo retention. Analytics only.
- Pro: $49/mo ($39/mo annual) — 5 sites, 1M events/mo, 1yr retention. Errors, replay, APM, uptime, logs.
- Enterprise: custom — unlimited. SSO/SAML, SLA, dedicated infrastructure.
- AI Command Center: $25/mo add-on (requires Pro+).
Baselime (post-Cloudflare acquisition):
- Cloudflare Workers: Free. Included in the Cloudflare dashboard.
- AWS Lambda / other providers: Pricing varies. The original Baselime had usage-based tiers. Post-acquisition, Cloudflare is pushing developers toward their own compute.
The consolidation math: Baselime (free for Workers) plus GA4 plus LogRocket ($99/mo baseline) plus Pingdom ($15/mo) = $114/mo minimum, assuming you're on Workers. JustAnalytics Pro = $49/mo for all surfaces.
But if you're pure Cloudflare Workers and only need backend traces, Baselime is literally free.
Who Should Pick What
Running Cloudflare Workers, backend observability is main need: Baselime. It's free. It's integrated into the dashboard. It's purpose-built for Workers' isolate model. No reason to look elsewhere for backend traces.
Running AWS Lambda, need serverless-specific APM: Baselime. Their Lambda instrumentation predates the Cloudflare acquisition. The invocation-centric debugging model fits how Lambda actually works.
Frontend-heavy, need session replay plus analytics: JustAnalytics. Baselime doesn't do replay or web analytics. JustAnalytics bundles both in one script.
Next.js on Vercel, hybrid serverless: This is the annoying middle ground. Baselime handles Vercel Functions. JustAnalytics handles frontend replay and analytics. You might want both — Baselime for API route debugging, JustAnalytics for user journey context. Or you consolidate on JustAnalytics and accept less serverless depth. No perfect answer here.
Early-stage, need predictable costs: JustAnalytics Pro at $49/mo is predictable. Baselime's free tier for Workers is great if you're Cloudflare-native. Neither will surprise-bill you at 3am. Compare this with our state of web analytics pricing report for broader market context.
Our Honest Take
Baselime built something genuinely good for serverless observability. Their team understood that traditional APM doesn't map to ephemeral functions. Cloudflare acquiring them made sense — Workers needed native observability, and Baselime had already solved the hard problems.
But Baselime never tried to be a frontend platform. No replay. No analytics. No browser-side coverage. When the bug is "users are confused by the checkout flow" and you need to watch what they clicked, Baselime can't help. That's not a criticism — it's a scope choice. They picked a lane.
We picked the opposite lane. JustAnalytics covers frontend surfaces Baselime doesn't touch — replay, analytics, browser-side errors — while also handling APM, logs, and uptime. Our serverless support via OpenTelemetry isn't as turnkey as Baselime's native integrations. I wish it were. We're working on it. But if Lambda auto-instrumentation depth is your deciding factor today, Baselime wins.
The question isn't which tool is "better." It's which layer is breaking. Serverless function execution? Baselime. Browser experience? JustAnalytics. You know your stack.
More comparison posts on the JustAnalytics blog — including AppSignal comparison, Highlight.io alternative, and migrating from Pingdom. For teams running serverless e-commerce, VeloCalls tracks pay-per-call conversions.
Frequently Asked Questions
Does Baselime have session replay?
No. Baselime focuses on serverless backend observability — traces, logs, and metrics from Lambda, Workers, and similar platforms. It doesn't touch the browser. JustAnalytics includes pixel-perfect DOM replay with privacy masking as part of the Pro plan at $49/mo.
Can I use Baselime for web analytics and conversion funnels?
No. Baselime is serverless-native APM — it tracks function invocations, cold starts, and distributed traces, not marketing analytics. You'd need GA4, Plausible, or another tool for pageviews and funnels. JustAnalytics bundles web analytics with errors, APM, replay, and uptime in one script.
Is Baselime free now that Cloudflare acquired it?
Yes. Since Cloudflare's April 2024 acquisition, Baselime's core features are free for Cloudflare Workers users and integrated into the Cloudflare dashboard. For AWS Lambda and other providers, pricing details vary. JustAnalytics has a permanent Free tier at 100K events/mo and Pro at $49/mo for the full stack.
Should I use Baselime or JustAnalytics for a Next.js app on Vercel?
It depends on your pain point. If you're debugging serverless function cold starts and API route traces, Baselime's serverless-native approach helps. If you need frontend session replay, web analytics, and uptime monitoring alongside error tracking, JustAnalytics covers more ground in one script.
Try JustAnalytics
All-in-one observability in one under-5KB script: cookieless analytics + error tracking + APM + session replay + uptime + structured logs. Replaces GA4 + Sentry + Datadog + Pingdom + LogRocket. Free tier (100K events/mo), Pro $49/month ($39 annual).
Author at JustAnalytics.