Check if Calibre is down, official outages, user-reported issues, and outages map.
Calibre is working normally
Check the number of user-reported issues over the past 24 hours, grouped into 20-minute intervals. It's normal to see occasional reports, which may be due to individual user issues rather than a broader problem. We only consider an issue widespread if there are multiple reports within a short timeframe.
IsDown has tracked 26 incidents since started monitoring Calibre status in November 2021. We collect data from 4522+ services, and normalize the data to give you a clear picture of the impact of the outage. It will show official Calibre outages and also issues that we're started by a spike in crowdsource reports.
| Date | Incident | Duration |
|---|---|---|
|
Oct 20, 2025
07:00 AM EDT
|
Major
Due to AWS incident with various services, we are experiencing delays in tests for North Virginia...
|
about 15 hours |
|
May 28, 2025
10:05 PM EDT
|
Minor
We are currently investigating this issue.
|
17 minutes |
|
Jun 27, 2024
06:23 PM EDT
|
Major
We are currently investigating application unavailability.
|
about 5 hours |
|
Jan 09, 2024
05:47 PM EST
|
Major
We are currently investigating test processing delays in all testing regions. You might experienc...
|
about 6 hours |
|
Nov 08, 2022
02:38 AM EST
|
Minor
We are currently investigating test delays in the Canada region. You might experience some Snapsh...
|
about 2 hours |
|
Oct 01, 2022
04:30 AM EDT
|
Minor
We are investigating a delay in tests being processed.
|
about 2 hours |
|
Sep 14, 2022
06:31 AM EDT
|
Minor
We are currently investigating test delays in the North Virginia region. You might experience som...
|
about 1 hour |
|
Aug 23, 2022
07:57 PM EDT
|
Minor
An upstream DNS issue is preventing API requests (Node.js API, Command Line Client) made to api.c...
|
about 2 hours |
|
Jul 12, 2021
02:43 AM EDT
|
Minor
We are currently investigating elevated error reports for Calibre's user interface and APIs.
|
9 months |
|
Feb 11, 2021
08:08 PM EST
|
Minor
Due to an outage of our hosting provider, Vercel, our marketing website and documentation might b...
|
about 1 year |
See what users are saying about Calibre issues that impacted them and how they are affected by the outage. You can see if other users are experiencing the same issues and if there are any workarounds or solutions.
Richard - Caliber is simply just not loading for me..
Patrick - Crashes with every document when converting to epub file format .
Joshua - authenication server error.
| Component | Status | Details |
|---|---|---|
| Application status | OK | View details |
| CLI & Node.JS API status | OK | View details |
| Test Agents status | OK | View details |
| Website & Documentation status | OK | View details |
Users are monitoring tens of services with IsDown. Here are some that are monitored together with Calibre. With IsDown you can get a bird's eye view of all your dependencies and how they are performing.
Website performance monitoring and optimization tool with data centers in global locations including Singapore, Ohio, Northern California, Oregon, Tokyo, Seoul, North Virginia, and Sydney.
Monitoring Calibre since November 2021
Tracking 20 Calibre services and regions
2 incidents in 2025
IsDown is a status page aggregator that monitors if Calibre and all your dependencies are experiencing issues. We combine the status of all the services you dependent and provide a clear view of all your vendors health in one place. We not only monitor official information but also crowdsourced reports. That means that even when Calibre, per example, doesn't report an outage, you will still be notified if other users are experiencing issues.
Every few minutes we go to the status page of Calibre (and 4,522+ other services) and check if they are experiencing issues. We collect the status and outage information of Calibre's 20 components. Also, we not only monitor official sources but also user reports. Sometimes or a lot of times vendors take some time to report an incident, so by monitoring user reports we're able to alert you early.
Not only you will get notified, but IsDown offers notification filters, so you can choose which issues you want to be notified about. This way you avoid getting all the incidents from Calibre and other services.
IsDown checks Calibre official status page for major/minor outages or downtimes. A major outage is when Calibre experiences a critical issue that severely affects one or more services/regions. A minor incident is when Calibre experiences a small issue affecting a small percentage of its customer's applications. An example is the performance degradation of an application. The moment we detect a Calibre outage, we send you an alert and update your dashboard and status page.
Calibre and other vendors don't always report outages on time. IsDown collects user reports to provide early detection of outages. This way, even without an official status update, you can stay ahead of possible problems.
IsDown collects all information from the outages published in Calibre status page to provide the context of the outage. If available, we gather the title, description, time of the outage, status, and outage updates. Another important piece of information is the affected services/regions which we use to filter the notifications that impact your business.
Calibre publishes scheduled maintenance events on their status page. IsDown collects all the information for each event and creates a feed that people can follow to ensure they are not surprised by unexpected downtime or problems. We also send the feed in our weekly report, alerting the next maintenances that will take place.
IsDown monitors Calibre and all their 20 components that can be affected by an outage. IsDown allows you to filter the notifications and status page alerts based on the components you care about. For example, you can choose which components or regions affect your business and filter out all other outages. This way you avoid alert fatigue in your team.
Our tool was build to be the best way to monitor all your external dependencies in one place. IsDown not only will help you monitor Calibre but also 4,522 other services. Your team and customers will have a clear view of all your dependencies and their status, making it easier to identify and resolve issues.
Add all your dependencies to your dashboard. IsDown will monitor them in real-time and send you alerts when there is an issue. You can also create a status page for a bird-eye view and share it with your team.
Start Monitoring for Free
Not only you will get notified, but IsDown offers notification filters, so you can choose which issues you want to be notified about. This way you avoid getting all the incidents from Calibre and other services.
Start Monitoring for Free
IsDown integrates with 20+ tools. Connect the status of Calibre and 4,522 other vendors to your tools to receive vendor outage alerts exactly where your team needs them.
Start Monitoring for Free
Create a status page that can easily be access by your team and customers. You can make it public or private, and customize it to your needs. This will be your first line of communication when there's the question 'Is Calibre down?'
Start Monitoring for Free
While Downdetector relies on user-submitted reports to detect Calibre outages, IsDown monitors Calibre's status page for verified, detailed incident information. Here's why official monitoring provides better reliability for your business:
| Features |
|
Downdetector |
|---|---|---|
| Official Calibre status page monitoring with real-time incident details. | ||
| Monitor 4,522+ services including Calibre in a single dashboard. | ||
| Instant Calibre outage alerts sent to Slack, Teams, PagerDuty, and more. | ||
| Combined monitoring of Calibre official status and user-reported issues. | ||
| Maintenance feed for Calibre | ||
| Granular alerts filtering by Calibre components and regions. |
14-day free trial • No credit card required
Calibre isn't down. You can check Calibre status and incident details on the top of the page. IsDown continuously monitors Calibre official status page every few minutes. In the last 24 hours, there were 0 outages reported.
Calibre is currently operational. You can check Calibre status and incident details on the top of the page. The status is updated in almost real-time, and you can see the latest outages and issues affecting customers.
No, there is no ongoing official outage. Check on the top of the page if there are any reported problems by other users.
Currently there's no report of Calibre being slow. Check on the top of the page if there are any reported problems by other users.
IsDown monitors the Calibre official status page every few minutes. We also get reports from users like you. If there are enough reports about an outage, we'll show it on the top of the page.
Calibre last outage was on October 20, 2025 with the title "Test delays"
Because IsDown is a status page aggregator, which means that we aggregate the status of multiple cloud services. You can monitor Calibre and all the services that impact your business. Get a dashboard with the health of all services and status updates. Set up notifications via Slack, Datadog, PagerDuty, and more, when a service you monitor has issues or when maintenances are scheduled.
IsDown and DownDetector help users determine if Calibre is having problems. The big difference is that IsDown is a status page aggregator. IsDown monitors a service's official status page to give our customers a more reliable source of information instead of just relying on reports from users. The integration allows us to provide more details about Calibre's Outages, like incident title, description, updates, and the parts of the affected service. Additionally, users can create internal status pages and set up notifications for all their third-party services.
14-day free trial · No credit card required · No code required