Calibre vs SpeedCurve (2026): which should you pick?

Pick Calibre if

• Fits if you watch lots of sites, since Starter allows unlimited sites
• Works for developers who want speed checks on each GitHub pull request

Look elsewhere if

• Watch out: monitoring stops when the monthly test allowance runs out, unless you buy packs at $60 per 5,000
• Tight if you get real traffic, as Starter's real user tracking pauses at 5,000 sessions a month
• Pricey if your team grows, at $15 a month for each seat past those included
• Watch out: cancelling deletes all of an account's data immediately and permanently
• Pricey if you pay yearly expecting a discount, as $900 is the same as 12 monthly payments

Pick SpeedCurve if

• Fits if you want to see whether faster pages line up with more conversions
• Works for teams of any size, since users and teams are unlimited

Look elsewhere if

• Watch out: every URL, browser, region and scheduled run counts as a check, so testing many pages in many places adds up fast
• Not for you if you might cancel mid-year, as annual plans get no prorated refund
• Pricey if you want 13 months of data or priority support, which start at $500 a month
• Tight if you need SSO or private test agents, which need an annual plan over $12,000
• Watch out: paying by invoice needs a plan of $5,000 a year or more

Calibre

• There is no free plan, and monitoring stops when the monthly test allowance runs out unless you add test packs at $60 per 5,000.
• Starter's real user tracking pauses at 5,000 sessions a month; Team includes 10,000 and then charges $75 per 100,000.
• Seats beyond those included cost $15 a month each, and paying yearly costs the same as 12 monthly payments.
• Cancelling deletes all of an account's data immediately and permanently.

SpeedCurve

• The listed prices include a 20% annual discount, and an annual plan cancelled partway through gets no prorated refund.
• Synthetic checks count every URL, browser, region and scheduled run, so testing many pages in several places raises the cost quickly.
• 13-month data retention and priority support start at $500 a month; single sign-on and private agents need an annual plan over $12,000.
• Paying by invoice is limited to plans of $5,000 a year or more.

Calibre

Real user monitoring

Collects Core Web Vitals from real browser sessions, with adjustable sampling and attribution of the page elements behind slow interactions.

Chrome UX Report monitoring

Tracks Google's CrUX field data for every monitored site and shows which pages pass the Core Web Vitals assessment.

Synthetic page speed tests

Scheduled and on-demand lab tests for each URL and test profile, with synthetic snapshots kept for the life of the account.

Third-party impact

Breaks down how external scripts and other third-party resources affect each page's load and responsiveness.

Developer tooling

A command-line client, Node.js API, webhooks, GitHub pull request checks and CI/CD hooks to test before and after deploys.

Sites ranked by speed

An overview that ranks every monitored site by performance, with alerts sent to Slack and deploy markers from Netlify.

SpeedCurve

Real user monitoring

Measures page views from real visitors, with sampling to control cost, custom data, conversion correlation and A/B test segments.

Synthetic monitoring

Scheduled tests in several browsers and regions, with scripting for user flows, pages behind a login and private staging sites.

Performance budgets and alerts

Set budgets on RUM and synthetic metrics and get alerts by email, Slack or webhook when a page crosses one.

Core Web Vitals debugging

Breaks Core Web Vitals into subparts, finds layout shift causes, and tracks first- and third-party requests and JavaScript impact.

Competitive benchmarking

Test competitors' pages alongside your own and produce side-by-side comparison videos.

CI/CD and deploy testing

Trigger tests on each deploy through the API, the GitHub integration or CI tools such as CircleCI, and mark deployments on charts.

Calibre

• Starter$75

  per month, billed monthly or $900 a year

  5,000 real user sessions and 5,000 synthetic tests a month, CrUX data, 3 seats, unlimited sites, 1 team and 90 days of RUM data.

• Team$150

  per month, billed monthly or $1,800 a year

  10,000 real user sessions, 15,000 synthetic tests, 10 seats, unlimited teams, SAML single sign-on and 1 year of RUM data.

• Company$1,500

  per month, paid yearly

  1 million real user sessions, 50,000 tests, 50 seats, a security audit log, invoice payment, priority support and 2 years of RUM data.

SpeedCurve

• Starter$90

  per month, billed annually, for 500K page views and 3K checks

  Unlimited users and teams, RUM and synthetic monitoring. Priced at $15 per 1,000 checks and $135 per million page views, less 20% for annual billing.

• Growth$576

  per month, billed annually, for 2M page views and 30K checks

  Plans above $500 a month add 13 months of data retention, high-priority support and priority synthetic testing.

• EnterpriseCustom

  Single sign-on, private test agents and regular check-ins on annual plans above $12,000 a year, and consulting above $20,000 a year.

Calibre

No public discounts listed.

SpeedCurve

• Annual discount

  Save 20% with annual billing

  SpeedCurve's plan builder and billing docs give a 20% discount for paying annually instead of monthly.

• Other savings

  10% volume discount on larger plans

  The plan builder takes a further 10% off when a plan comes to more than $25,000 a year.