Best Calendar Software - Page 15

How Many Calendar Software Products Does G2 Track?

Total Products under this Category: 337

Category Stats (Nov 2026)

  • Average Rating: 4.49/5 (↑0.02 vs Oct 2026) The average rating of products in this category, based on all submitted ratings
  • Top Trending Product: Modern Events Calendar (+7.82%) - Among all products in this category, Modern Events Calendar recorded the largest rating increase compared to last month

Last updated: November 10, 2026

How Does G2 Rank Calendar Software Products?

Why You Can Trust G2's Software Rankings:

  • 30 Analysts and Data Experts
  • 162,100+ Authentic Reviews
  • 337+ Products
  • Unbiased Rankings

G2's software rankings are built on verified user reviews, rigorous moderation, and a consistent research methodology maintained by a team of analysts and data experts. Each product is measured using the same transparent criteria, with no paid placement or vendor influence. While reviews reflect real user experiences, which can be subjective, they offer valuable insight into how software performs in the hands of professionals. Together, these inputs power the G2 Score, a standardized way to compare tools within every category.

G2 Grid® for Calendar Software

G2 Grid® for Calendar Software plotting products by satisfaction and market presence

Highlighted products: Google Workspace, Microsoft Outlook, Zoom Workplace, Microsoft 365, ClickUp, Calendly, GlossGenius, and Reclaim.ai.

Underlying data: [Grid® JSON](https://www.g2.com/categories/calendar-software/grids.json?focus%5B%5D=google-workspace&focus%5B%5D=microsoft-outlook&focus%5B%5D=zoom-workplace&focus%5B%5D=microsoft365&focus%5B%5D=clickup&focus%5B%5D=calendly&focus%5B%5D=glossgenius&focus%5B%5D=reclaim-ai)

Iris Works

Iris Works is a all-inclusive studio management software for photographers - client & document tracking, session & workflow mgmt, accounting assistance & client gallery sharing

Who Is the Company Behind Iris Works?

Who Uses This Product?

  • Company Size: 100% Large

What Are Recent G2 Reviews of Iris Works?

What Are G2 Users Discussing About Iris Works?

itrezzo

itrezzo provides enterprise software that enhances employee productivity for any company running Microsoft Exchange Server. As one of the first third-party developers for BlackBerry in 2001, itrezzo has a long list of clients ranging from government agencies to large scale enterprise businesses. Companies and agencies using itrezzo profit from the cost-saving and productivity enhancement that comes with the automation of contact and calendar sync to smartphones. Based in San Jose California, itrezzo continues to develop quality software for Microsoft users.

Who Is the Company Behind itrezzo?

  • Seller: CiraApps
  • Year Founded: 2001
  • HQ Location: San Jose, US
  • LinkedIn® Page: www.linkedin.com
    1 employees on LinkedIn®

Kaantera

Who Is the Company Behind Kaantera?

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Connect G2 to Claude or ChatGPT for answers grounded in G2's trusted reviews, comparisons, and pricing from real user insights.

How it works

Kalender-Sync

Kalender Sync is a GDPR-compliant SaaS for synchronizing calendar availability across providers. Unlike US-based tools that copy entire events (titles, attendees, notes) between calendars, Kalender Sync only transfers Free/Busy slots — your private event details never leave the calendar where you created them. Supported providers: Google Calendar, Microsoft Outlook / Office 365, Apple iCloud (CalDAV), KSuite / Infomaniak (CalDAV), and any iCal feed. Real-time sync via OAuth webhooks (no polling). Hosted at Hetzner in Germany. Data Processing Agreement (DPA / Auftragsverarbeitungsvertrag) available. Built for DACH professionals, freelancers, and small teams who can't compromise on data sovereignty.

Who Is the Company Behind Kalender-Sync?

Kickserv

Kickserv provides an approachable and affordable way for service companies to manage leads, schedule and manage jobs, estimates, invoices and payments from anywhere. Trusted by professionals since 2006, our user interface is easy to use and easy to learn. Mobile applications for iOS and Android and integration with QuickBooks are included with all plans. World class support so you don’t have to go it alone. This is service made simple.

Average Rating: 4.5/5.0

Total Reviews: 182

How Do G2 Users Rate Kickserv?

  • Has the product been a good partner in doing business?: 9.1/10 (Category avg: 9.1/10)

Who Is the Company Behind Kickserv?

  • Seller: EverCommerce
  • Company Website:
  • Year Founded: 2016
  • HQ Location: Denver, Colorado
  • LinkedIn® Page: www.linkedin.com
    1,613 employees on LinkedIn®
  • Ownership: NASDAQ: EVCM

Who Uses This Product?

  • Who Uses This: Owner, President
  • Top Industries: Construction, Consumer Services
  • Company Size: 85% Small, 15% Medium

What Do G2 Reviewers Say About Kickserv?

AI-generated summary from verified user reviews

Pros
  • Users appreciate the ease of use of Kickserv, enhancing their experience in managing time and work orders.
  • Users value the ease of scheduling with Kickserv, which improves efficiency and customer service support is exceptional.
  • Users praise the exceptional customer support of Kickserv, appreciating quick help and effective solutions for their needs.
  • Users love the ease of scheduling with Kickserv, enhancing their service management and customer interactions.
  • Users value the effective client management features of Kickserv for enhancing service operations and customer satisfaction.
Cons
  • Users find the mobile app hard to work with, noting restrictions and difficulties that impact usability.
  • Users face scheduling issues with Kickserv, struggling to navigate the calendar when it becomes cluttered.
  • Users find the calendar navigation cumbersome as it lacks an option to directly return to previous weeks.
  • Users note the limited functionality of Kickserv, particularly regarding mobile app capabilities and employee interaction.
  • Users are frustrated by the higher subscription rate required to enable external payment features in Kickserv.

What Are Recent G2 Reviews of Kickserv?

What Are G2 Users Discussing About Kickserv?

Kimpa

Kimpa is a security-first, privacy-focused business email and workspace platform built for organisations that prioritise protecting their communications and business information. Business email sits at its core, connected with calendars, contacts, tasks, notes, team messaging, file storage, documents, spreadsheets and presentations across web, desktop and mobile. Privacy and data protection guide Kimpa’s design, helping teams communicate, collaborate and manage their work with greater control over their information.

Who Is the Company Behind Kimpa?

  • Seller: Glemad
  • Year Founded: 2020
  • HQ Location: Mountain View, US
  • LinkedIn® Page: www.linkedin.com
    5 employees on LinkedIn®
  • Ownership: Private
  • Phone: +2349166449143

KosmoTime

Frustrated with your to-do list? Falling behind? KosmoTime is the first FOCUSED PRODUCTIVITY ASSISTANT. KosmoTime integratie task management with calendar and distraction blocking. You can - Reserve time in your calendar to focus on your tasks - Batch related Tasks in "Focus Blocks" - Let Kosmo Block all Distractions while you're in focused mode

Average Rating: 4.6/5.0

Total Reviews: 9

Who Is the Company Behind KosmoTime?

Who Uses This Product?

  • Company Size: 67% Medium, 25% Small

What Are Recent G2 Reviews of KosmoTime?

What Are G2 Users Discussing About KosmoTime?

Kronologic

Kronologic sends tailored and timely calendar invites to qualified leads from your reps' calendar. When meeting invites are sent at the right time, with the right message... Leads 1-Click accept and reps just show up. 2-3X your conversion rates, pipeline and revenue with Kronologic's Calendar First™ Software... Only pay when a meeting is accepted!

Average Rating: 4.2/5.0

Total Reviews: 242

How Do G2 Users Rate Kronologic?

  • Has the product been a good partner in doing business?: 9.0/10 (Category avg: 9.1/10)

Who Is the Company Behind Kronologic?

Who Uses This Product?

  • Who Uses This: Account Manager, SDR
  • Top Industries: Information Technology and Services, Computer Software
  • Company Size: 56% Large, 32% Medium

What Are Recent G2 Reviews of Kronologic?

What Are G2 Users Discussing About Kronologic?

LemCal

Who Is the Company Behind LemCal?

Lifestack

Lifestack is an innovative daily planner that seamlessly integrates your calendar, tasks, and health data to optimize both productivity and well-being. By syncing with wearable devices such as Apple Watch, Oura Ring, and WHOOP, Lifestack analyzes your sleep patterns, heart rate variability, and activity levels to create personalized schedules that align with your natural energy rhythms. This approach ensures that you tackle demanding tasks during peak focus periods and allocate time for rest and recovery when your energy is low. Key Features and Functionality: - Energy-Based Planning: Lifestack identifies your daily energy peaks and dips, allowing you to schedule tasks when you're most alert and productive. - Wearable Integration: The app syncs with devices like Apple Watch, Oura Ring, and WHOOP to gather real-time health metrics, providing a comprehensive view of your well-being. - Personalized Scheduling: By analyzing your circadian rhythms and health data, Lifestack crafts daily plans that balance work, meals, sleep, and focus periods tailored to your unique needs. - Adaptive AI Assistant: Lifestack's AI continuously adapts to your lifestyle, offering proactive suggestions and adjustments to your schedule based on real-time data. Primary Value and User Benefits: Lifestack addresses the challenge of balancing productivity with personal health by providing a dynamic planning tool that adapts to your body's natural rhythms. By aligning your daily tasks with your energy levels, it helps prevent burnout, enhances focus, and promotes overall well-being. This personalized approach empowers users to achieve their goals efficiently while maintaining a healthy lifestyle.

Who Is the Company Behind Lifestack?

  • Seller: Lifestack
  • Year Founded: 2022
  • HQ Location: San Francisco, US
  • LinkedIn® Page: www.linkedin.com
    8 employees on LinkedIn®

Luana

Luana is a family command center built around the TV you already own. It puts a shared calendar, rotating chore charts, a kid-friendly star rewards system, and a family photo screensaver on the living room TV, always visible and always up to date. Parents manage everything from a web dashboard or mobile app, and changes sync to the TV automatically. Luana works on Roku, Fire TV, Google TV, LG webOS, and Samsung Tizen TVs. Plans start at $7.99/month or $79.99/year, with a 14-day free trial. Families end up coordinating everything through group texts and one parent's phone; Luana puts the shared calendar and chore list somewhere everyone can see it without opening an app.

Who Is the Company Behind Luana?

  • Seller: Luana
  • Year Founded: 2026
  • HQ Location: N/A
  • LinkedIn® Page: www.linkedin.com
    1 employees on LinkedIn®

Mailfence

Mailfence strives to make the internet a safer place. That’s why we developed our encrypted email solution. But in our opinion, just offering secure and private email is not sufficient. Otherwise our users would need to use insecure solutions to manage their appointments, create and store their files or chat online. That is why Mailfence is much more than secure email. Mailfence allows you to organize your life through powerful productivity tools such as Mailfence Calendar, Mailfence Documents, Mailfence Contacts, Mailfence Groups, Mailfence Chat and Mailfence Polls.

Average Rating: 4.7/5.0

Total Reviews: 5

Who Is the Company Behind Mailfence?

Who Uses This Product?

  • Company Size: 60% Small, 40% Medium

What Are Recent G2 Reviews of Mailfence?

What Are G2 Users Discussing About Mailfence?

Neeraja Prakash
NP
Researched and written by Neeraja Prakash
Updated March 6, 2025