Calibre vs JetOctopus in 2026: Performance monitoring vs large-site crawl and log analysis
One unifies RUM, synthetic testing, and Google CrUX data for site speed. The other combines a JS crawler, real-time server log analysis, and AI bot tracking for large sites, with no seat or project limits on any plan.
Calibre
JetOctopus- Calibre unifies RUM, synthetic testing, and Google CrUX data in one dashboard. JetOctopus does not measure page speed at all beyond flagging Core Web Vitals regressions inside its alerts module.
- JetOctopus is built around real-time server log analysis, which Calibre does not offer in any form.
- JetOctopus tracks more than 40 bots, including GPTBot, ClaudeBot, and PerplexityBot, comparing their crawl behavior against Googlebot. Calibre has no bot-tracking capability.
- Every JetOctopus plan includes unlimited users and unlimited projects. Calibre caps seats at 3 on Starter and charges per tier up to 50 on Company.
- Calibre starts at $75/month with a 15-day trial. JetOctopus starts at 293 EUR/month billed annually with no self-serve trial mentioned.
- Calibre ships an Automation API and CLI built for CI/CD pipelines. JetOctopus's public site does not document a comparable developer API.
Calibre and JetOctopus get grouped together as technical SEO tools, but they answer different questions. Calibre tells you how fast your pages load, using real visitor sessions, scheduled synthetic tests, and Google's own CrUX field data side by side. JetOctopus tells you what Googlebot, Bingbot, and a growing list of AI crawlers actually do on your site once they arrive, by combining a JavaScript-aware crawler with real-time server log analysis and 16-plus months of Search Console history. If your problem is "our pages feel slow," Calibre is built for that. If your problem is "we have millions of URLs and no idea where crawl budget is going," JetOctopus is built for that. Very few teams need both at once, but the ones that do tend to be large in-house teams or agencies managing complex sites, exactly the audience JetOctopus's unlimited-seat pricing model was built for.
The tools at a glance
Calibre
Web performance monitoring platform that unifies real user monitoring, Google CrUX data, and synthetic page speed tests
Calibre puts three performance data sources on the same timeline: real user monitoring captured from actual visitor sessions, scheduled synthetic tests run from controlled environments, and Google CrUX data pulled directly from the Chrome User Experience Report. Most teams juggle these across separate tools and reconcile the numbers by hand. Calibre keeps them on one dashboard with shared date ranges and filters, which makes it much faster to tell whether a Core Web Vitals problem is real or an artifact of one measurement method.
The Automation API and CLI are the part development teams notice first. You can trigger tests from a CI/CD pipeline, fail a build when a performance budget is exceeded, and pull historical data from the terminal without opening the dashboard. That workflow fit is what separates Calibre from simpler synthetic-only tools.
The catch is session volume. Starter includes 5,000 RUM sessions a month, which a moderately trafficked site burns through fast, and the next tier up costs $150 while Company jumps to $1,500 with nothing in between. Calibre is a strong fit for teams that live inside its session limits; anyone above that has to make a large jump or supplement with sampling.
| Feature | Starter $75/month | Team $150/month | Company $1,500/month |
|---|---|---|---|
| Real User sessions per month | 5,000 | 10,000 | 1,000,000 |
| Synthetic tests per month | 5,000 | 15,000 | 50,000 |
| Google CrUX data | Yes | Yes | Yes |
| Team seats | 3 | 10 | 50 |
| API and CLI access | Yes | Yes | Yes |
JetOctopus
SEO crawler and log analyzer for large sites that combines crawl data, server logs, GSC, and GA4 with no seat or project limits
JetOctopus is built for the moment a site gets too big to reason about with a standard crawler. Its JavaScript crawler runs at up to 250 pages per second and flags pages that render as empty, which is a real problem for any bot, human search or AI, trying to read your content. The log analyzer sits alongside it, ingesting server logs to show which pages Googlebot, Bingbot, and more than 40 other bots actually visited, at what frequency, and where crawl budget is quietly going nowhere.
The AI bot tracking is where JetOctopus separates itself from older-generation crawlers. GPTBot, ClaudeBot, and PerplexityBot are tracked alongside Googlebot in the same log data, so a team can directly compare what AI crawlers reach against what Google reaches, instead of guessing from indirect signals. A dedicated AI Search Visibility module builds on that comparison to flag pages AI bots cannot access at all.
Pricing is volume-based rather than seat-based: every plan includes unlimited users and unlimited projects, and you add crawl pages, log lines, or GSC properties as needed. That structure rewards agencies and enterprise teams running many client sites, but the EUR-denominated, modular pricing means you need JetOctopus's calculator to know your real monthly cost before committing, and there is no published self-serve trial.
| Feature | 500K Plan 293 EUR/month (billed annually) | Add-on: Crawl from 138 EUR/month | Add-on: Logs from 86 EUR/month | Add-on: GSC from 43 EUR/month |
|---|---|---|---|---|
| Crawl pages included | 500K (or 250K JS) | Up to 10M+ | N/A | N/A |
| Log lines included | 2M | N/A | Up to 50M | N/A |
| GSC properties | 3 | N/A | N/A | Up to 1,000 |
| User and project limits | None | None | None | None |
| AI bot tracking | ✓ | ✓ | ✓ | ✓ |
Head-to-head feature comparison
| Feature | Calibre | JetOctopus |
|---|---|---|
| Primary focus | Web performance monitoring (RUM, synthetic, CrUX) | Site crawling and server log analysis for large sites |
| Real user monitoring (RUM) | Yes | No |
| Synthetic performance testing | Yes | No |
| Google CrUX data | Yes | No |
| Site crawling | No | Yes, up to 250 pages/sec with JS rendering |
| Server log analysis | No | Yes, real-time, core to the product |
| AI bot tracking (GPTBot, ClaudeBot, PerplexityBot) | No | Yes, 40+ bots tracked |
| Google Search Console integration | No | Yes, 16+ months via bulk API |
| Seat / user limits | 3 seats (Starter) up to 50 (Company) | None, unlimited users and projects on every plan |
| Free trial | Yes, 15 days | Not advertised; contact required |
| Automation API / CLI for CI/CD | Yes | Not documented on the public site |
| Starting price | $75/month | 293 EUR/month billed annually |
Which should you choose?
CalibreJetOctopusJetOctopusCalibreJetOctopusCalibreThis is less a head-to-head than two tools solving adjacent but different problems. Calibre answers "how fast do our pages load and for whom," using RUM, synthetic tests, and CrUX data together. JetOctopus answers "what do bots actually do when they reach our site," using crawl data and server logs together. A large site with crawl budget waste will not fix that with Calibre, and a site with a genuine Core Web Vitals problem will not diagnose it with JetOctopus's alerting alone.
Bottom line
Pick Calibre if the open question is page speed and you want RUM, synthetic testing, and CrUX data on one screen with CI/CD hooks. Pick JetOctopus if the open question is crawl budget, indexation, or how AI bots move through a large site, and you want that without seat limits eating into an agency or enterprise budget. Sites big enough to need JetOctopus for crawl and log data often still run Calibre or a similar tool separately for speed monitoring; the two are complementary, not competing, purchases.
Frequently asked questions
Can JetOctopus replace Calibre for Core Web Vitals monitoring?
Not fully. JetOctopus's real-time alerts module flags Core Web Vitals regressions as part of its broader monitoring, but it has no RUM, synthetic testing, or CrUX dashboard the way Calibre does. Teams whose primary need is page speed diagnosis still need a dedicated performance tool.
Does Calibre track AI crawlers like GPTBot or ClaudeBot?
No, Calibre has no crawler or bot-tracking capability at all; it measures page load performance, not bot behavior. For AI bot tracking, JetOctopus's log analyzer covers more than 40 bots including GPTBot, ClaudeBot, and PerplexityBot.
Is JetOctopus worth it for a small site with a handful of pages?
Probably not. JetOctopus is priced and built around large-site problems, crawl budget waste, log-scale bot behavior, GSC history at scale, and a small site will not generate enough data to justify the 293 EUR/month starting cost. Calibre or a simpler crawler will cover a small site's needs more cheaply.
How does JetOctopus pricing compare to Calibre for an agency with multiple clients?
JetOctopus includes unlimited users and unlimited projects on every plan, so an agency pays for crawl and log volume rather than per-client seats. Calibre caps seats at 3 on Starter and 10 on Team, which becomes restrictive once an agency needs to give several clients direct dashboard access.
Does either tool offer a free trial before committing?
Calibre offers a 15-day free trial with no credit card required. JetOctopus does not advertise a self-serve trial on its public site; access appears to require contacting sales directly.