Calibre vs DebugBear (2026): which should you pick?
As of Oct 23, 2026, Calibre and DebugBear share a 2.2 GPA, neither has a free plan, and Calibre starts cheaper, at $75 a month against $99 a month.
Checked Oct 23, 2026 · graded Oct 23, 2026 by ToolGPA
They get the same grade on all five counts.
Price, platforms and features side by side. The table says where each price was read and when.
Calibre
Web performance monitoring with RUM, CrUX data and synthetic tests
DebugBear
Page speed and Core Web Vitals monitoring with lab tests and RUM
Which one is for you
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 DebugBear if
- Fits if you need lab, real-user and CrUX speed data for a site in one account
- Works for developers who want slow-page fixes as prompts for Claude Code or Cursor
Look elsewhere if
- Pricey if you have one small site, at $99 a month on yearly billing with no free plan
- Tight if you run several sites, as Startup covers 1 project and Team at $249 has 5
- Watch out: extra real-user page views, tests and projects are added for an extra monthly fee
- Not for you if you need SSO or invoice payment, which are Enterprise only at a custom price
How we grade them
| 2.2GPACalibreFair | 2.2GPADebugBearFair | |
|---|---|---|
| Value for money | CStarter is $75 a month, or $900 a year, for 5,000 real user sessions, 5,000 lab tests and 3 seats, at this category's dearer quarter. Team is $150 and Company $1,500 a month paid yearly. | CStartup is $99 a month billed yearly ($1,188 a year) for 4,000 lab tests, 100,000 real-user page views and 1 project, in this category's dearer quarter. Team is $249 and Corporate / Agency $699. |
| Free plan and trial | CNo free plan, but the 15-day trial needs no card. | CNo free plan, but the 14-day trial needs no card. After it, plans start at $99 a month on yearly billing. |
| Features | CReal user Core Web Vitals with interaction attribution, CrUX for every site, scheduled lab tests, third-party script impact, a CLI, Node.js API and GitHub pull request checks. It does speed monitoring fully, but that's a smaller job, and tests stop at the allowance. | CLighthouse lab tests including logged-in pages and user flows, real user Core Web Vitals with INP attribution, CrUX tracking against competitors, waterfalls, speed experiments, alerts and uptime checks. It does speed monitoring fully, but that's a smaller job. |
| Ease of use | CNo rating on record. You add sites, test profiles and real user tracking, and watch the session and test allowances so monitoring doesn't pause. | CNo rating on record. You set up projects, pages and test schedules, then read waterfalls across three kinds of data. |
| Platforms and integrations | BWeb, with a command-line client, Node.js API, webhooks, GitHub, Slack, Zapier, Netlify and Render. No desktop or phone app. | BWeb, with an API, Slack, Microsoft Teams, GitHub, Looker Studio, Netlify, Vercel and CircleCI. No desktop or phone app. |
| Best for | speed monitoring across many sites | speed and Core Web Vitals monitoring |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: Calibre and DebugBear. How we grade
Price against what you get
Calibre starts at $75 a month and scores 2.3 out of 4 on features, ease of use and platforms. DebugBear starts at $99 a month and scores 2.3.
They score the same, and Calibre starts $24 a month lower. Of the other technical SEO tools on the chart, 6 score higher than Calibre for less, and 7 score higher than DebugBear for less.
Features, ease of use and platforms, averaged
What paid plans start at, a month (each step along is roughly double) →
- The best score at each price
- Has a free plan
- No free plan
Where they differ
- DebugBear also covers dashboards.
At a glance
| Calibre | DebugBear | |
|---|---|---|
| Pricing | Free trial | Free trial |
| Starts at | $75 per month, billed monthly or $900 a year | $99 per month, billed yearly ($1,188 a year) |
| Free plan | None | None |
| Free trial | 15-day free trial, no credit card required | 14-day free trial, no credit card required |
| Web | ||
| Made by | Calibre Analytics | DebugBear Ltd |
| Price read from | calibreapp.com | debugbear.com |
| Checked | Oct 23, 2026 | Oct 23, 2026 |
Worth knowing
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.
DebugBear
- There is no free plan; after the 14-day trial, plans start at $99 a month on yearly billing.
- Startup covers 1 project and 10 users; more projects need Team (5) or Corporate / Agency (100).
- Extra RUM page views, synthetic tests and projects can be added to a plan for an extra monthly fee.
- Single sign-on, invoice payment and custom data retention come only with the custom-priced Enterprise plan.
Key features
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.
DebugBear
- Synthetic monitoring
- Scheduled and on-demand Lighthouse lab tests from test locations around the world, including pages behind a login and multi-step user flows.
- Real user monitoring
- Measures Core Web Vitals for real visitors and shows which page elements and scripts cause slow interactions that hurt INP.
- Google CrUX data
- Tracks Chrome User Experience Report data over time and compares your site's real-visitor speed with competitors.
- Waterfalls and recommendations
- Request waterfalls tied to CPU and rendering activity, automatic fix suggestions, and ready-made prompts for coding agents such as Claude Code or Cursor.
- Page speed experiments
- Try an optimization on a test run to see its effect before deploying the change to the live site.
- Alerts, comparisons and exports
- Automatic alerts on regressions, before-and-after comparisons, chart annotations, video exports and PDF or CSV reports. Data is kept for 24 months.
Plans
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.
DebugBear
Startup$99
per month, billed yearly ($1,188 a year)
4,000 synthetic tests (about 125 pages tested daily), 100,000 RUM page views, 10 uptime monitors, 1 project and 10 users.
Team$249
per month, billed yearly ($2,988 a year)
10,000 synthetic tests (about 320 pages daily), 500,000 RUM page views, 50 uptime monitors, 5 projects and 50 users.
Corporate / Agency$699
per month, billed yearly ($8,388 a year)
50,000 synthetic tests (about 1,600 pages daily), 2 million RUM page views, 100 monitors, 100 projects and unlimited users.
EnterpriseCustom
Custom quotes with invoice payment, single sign-on, security forms, custom contracts and data retention, training and Slack support.
Ways to pay less
Calibre
No public discounts listed.
DebugBear
- Annual discount
Save 20% with yearly billing
DebugBear's pricing page marks yearly billing as a 20% saving over paying month to month.
Common questions
Which is cheaper, Calibre or DebugBear?
As of Oct 23, 2026, Calibre is cheaper to start with: $75 a month, against $99 a month for DebugBear. Calibre starts at $75 per month, billed monthly or $900 a year, and DebugBear starts at $99 per month, billed yearly ($1,188 a year).
Which has a free plan, Calibre or DebugBear?
As of Oct 23, 2026, neither Calibre nor DebugBear has a free plan. Both have a free trial.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.