CloudLinux VS Oncallizer

Compare CloudLinux VS Oncallizer and see what are their differences

Rating: 0 reviews
Pricing: Open source
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Rating: 0 reviews
Pricing: Free
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Base details

Website, pricing, platforms and company facts side by side.

	CloudLinux	Oncallizer
Website	cloudlinux.com	oncallizer.com
Pricing	Open source	Free Official pricing
Company	—	Startup from Saudi Arabia · 1 - 9 employees · 2026
Listed in	Hosting Web Hosting Cloud Hosting VPS Hosting +1	Schedule Management Scheduling Medical Practice Management Employee Scheduling Appointments and Scheduling Productivity Calendar And Scheduling Appointment Scheduling Web Service Automation +6

About CloudLinux and Oncallizer

In their own words, as submitted to SaaSHub.

CloudLinux

Oncallizer

No description of CloudLinux yet.

Fair on-call schedules for residency programs and staff teams. Weekend rules, per-person caps, and a fairness score — then fine-tune any shift and export to Excel. Free, no signup for now!

Features and specs

What each product offers, as listed by its team.

CloudLinux 5 features

Oncallizer 5 features

Enhanced Server Stability
CloudLinux uses its lightweight virtualization technology (LVE) to isolate each tenant on a shared hosting server, preventing any single user from consuming excessive resources and crashing the server for everyone else. This ensures consistent uptime and performance.
Improved Security with HardenedPHP and KernelCare
CloudLinux offers HardenedPHP, which patches old and unsupported PHP versions against known vulnerabilities, and KernelCare, which provides live kernel patching without requiring server reboots. These features significantly enhance server security posture.
Resource Limit Management
Administrators can set granular resource limits (CPU, memory, I/O, number of processes, etc.) per user account using LVE Manager. This makes it easy to manage shared hosting environments and ensure fair resource distribution among tenants.
CageFS File System Virtualization
CageFS creates a virtualized file system for each user, preventing them from seeing other users on the server, viewing sensitive configuration files, or exploiting server vulnerabilities. This adds an important layer of isolation and security.
Wide Compatibility with Hosting Panels
CloudLinux integrates seamlessly with popular hosting control panels such as cPanel, Plesk, and DirectAdmin, making it straightforward for hosting providers to adopt without overhauling their existing infrastructure or workflows.

Possible disadvantages

Additional Licensing Cost
CloudLinux requires a paid monthly or annual license on top of the base server cost. For smaller hosting providers or individual server owners, this additional expense can add up and may not always be justifiable compared to free alternatives.
Limited to CentOS/RHEL-Based Systems
CloudLinux is built on top of RHEL/CentOS and does not support other Linux distributions like Ubuntu or Debian. This limits its adoption for hosting providers who prefer or already run non-RHEL-based environments.
Learning Curve for Configuration
While CloudLinux provides powerful resource management tools, properly configuring LVE limits, CageFS, PHP Selector, and other features requires a solid understanding of the platform. Misconfiguration can lead to users being unnecessarily restricted or resources being poorly allocated.
Potential Performance Overhead
The additional layers of virtualization, resource monitoring, and file system isolation introduced by CloudLinux can impose a slight performance overhead on the server compared to running a bare, unmodified Linux distribution without these controls.
Dependency on CloudLinux Ecosystem
Adopting CloudLinux means relying on their ecosystem for kernel updates, PHP patches, and security fixes. If the company experiences delays in releasing patches or changes its pricing/licensing model, hosting providers may find themselves locked into a dependency that is difficult to migrate away from.

Fairness engine
Hundreds of schedule attempts scored with Jain’s fairness index
Custom Rules
Weekend definitions, heavy-day weighting, per-person caps
Role balancing
Weekend definitions, heavy-day weighting, per-person caps
Manual Editing
Click any shift to reassign or swap it by hand
Excel export
Formatted multi-sheet workbook, ready to share

Analysis

An editorial look at what each product does well and who it suits.

CloudLinux

Oncallizer

Overall verdict

CloudLinux is a well-regarded, mature Linux OS distribution and toolset specifically designed for shared hosting and multi-tenant server environments, offering strong isolation, resource management, and security features that make it a solid choice for hosting providers.

Why this product is good

Provides LVE (Lightweight Virtual Environment) technology for per-tenant resource isolation, preventing 'bad neighbor' effects on shared servers
Enhances server stability and security by isolating users so that one account's issues (crashes, resource spikes) don't affect others
Offers extended lifecycle support (longer than standard CentOS/RHEL support windows), which is valuable for legacy systems
Includes tools like CloudLinux OS Shield, Imunify360 integration, and hardened kernel options for improved security
Compatible with popular control panels like cPanel and Plesk, making it easy to integrate into existing hosting stacks
Backed by an established company with a long track record in the hosting industry and responsive support
Offers granular control over CPU, memory, I/O, and other resources per user account
Provides PHP Selector and multiple PHP version support, useful for hosting providers serving diverse client needs

Recommended for

Web hosting companies running shared or reseller hosting environments
Hosting providers needing to isolate customer accounts on the same physical server
Businesses requiring extended OS support lifecycles beyond standard RHEL/CentOS EOL dates
Enterprises using cPanel or Plesk that want tighter security and resource control
Hosting companies looking to reduce support tickets caused by noisy-neighbor resource contention
IT teams managing multi-tenant infrastructure who need governance and monitoring tools built into the OS layer

No analysis of Oncallizer yet.

Videos

Walkthroughs and reviews on video.

CloudLinux 3 videos + Add

Oncallizer 0 videos + Add

When To Use Cloudlinux On Your Virtual Private Server (VPS)

Category popularity

How often each product is chosen within a category, 0–100% relative to the other.

Score bands 0–20 21–40 41–50 51–60 61–100

CloudLinux

Oncallizer

100% 100%

Cloud Hosting

0% 0%

Productivity

100% 100%

Web Hosting

0% 0%

Appointments and Scheduling

100% 100%

Questions & Answers

As answered by people managing CloudLinux and Oncallizer.

Which are the primary technologies used for building your product?

Oncallizer's answer:

Next.js, React, and TypeScript, with Supabase for accounts and storage. The schedule generator runs entirely in the browser — no data leaves your device unless you save to an account.

Why should a person choose your product over its competitors?

Oncallizer's answer:

Most on-call tools (Amion, QGenda) are enterprise systems with sales calls, contracts, and per-seat pricing. Oncallizer is the opposite: open the site, build a fair schedule in minutes, export it to Excel — And where most tools stop at “filled slots”, Oncallizer shows you a fairness score you can defend when someone asks why they got three weekends.

What makes your product unique?

Oncallizer's answer:

Oncallizer doesn’t just fill a calendar — it generates hundreds of candidate schedules and scores each one with Jain’s fairness index, so the schedule you get is measurably the fairest one. Weekend load, heavy days, and per-person caps are all enforced rather than silently broken, and roles (juniors vs seniors) are each balanced against their own fair share. It’s also free to use for now with no signup — the full builder runs in the browser.

What's the story behind your product?

Oncallizer's answer:

Oncallizer was born from watching schedulers spend hours in spreadsheets trying to balance weekend calls by hand — and still getting accused of unfairness. The fix: encode the rules people actually argue about (weekends, heavy days, caps, seniority), let an algorithm find the fairest arrangement, and show the fairness score so nobody has to take it on faith.

How would you describe the primary audience of your product?

Oncallizer's answer:

Whoever owns the on-call schedule: chief residents and program coordinators at residency and training programs, ward and unit schedulers, and team leads at any organization that shares call duty and argues about weekends.

User comments

Share your experience with using CloudLinux and Oncallizer. For example, how are they different and which one is better?