Karbon for Clients vs Cal.com
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Karbon for Clients
Securely share files, exchange information, and communicate with your accounting firm. Manage tasks and stay connected with your advisors from your mobile device. Track project progress and reduce back-and-forth communication.
- Secure file sharing
- Client-advisor communication
- Task management
- Real-time project updates
- Document signing
- Reduced email/calls
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Karbon for Clients makes it simple to securely share files, exchange information, and stay connected with your accounting firm—all in one place. Designed specifically for clients, this client portal app gives you a streamlined way to manage important tasks and communicate with your advisors from your mobile device. Easy Collaboration Send and receive files and messages, sign documents, and complete requests from your accountant—all in one secure hub. Secure File Sharing Upload files with confidence and keep your information safe using industry-standard security. Stay Informed with Real-Time Updates Track your project progress at a glance and see status updates the moment they happen. Ask Questions Anytime Send questions, follow up, or request clarity directly in Karbon for Clients to keep communication flowing smoothly. Reduce Back-and-Forth Simple requests and automatic notifications cut down on emails and calls, so you can focus on what matters. NOTE: Access to Karbon For Clients must be initiated by your tax or accounting professional.
Cal.com
This app simplifies scheduling meetings on the go. Book, reschedule, or cancel appointments with a few taps, syncing directly with your calendar. Receive smart notifications and integrate with your existing tools for seamless collaboration.
- Instant meeting booking, rescheduling, and cancellation
- Real-time calendar synchronization
- Smart push notifications for events
- Integration with email and video tools
- Mobile-friendly scheduling
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Cal.com Companion App: Schedule Meetings Effortlessly on the Go! Tired of juggling calendars and emails to book meetings? The Cal.com Companion App brings the power of Cal.com right to your fingertips, making scheduling seamless, fast, and mobile-friendly. Whether you're in a rush between calls or planning your week from anywhere, this app ensures you never miss a beat. Key Features: - Instant Scheduling: Book, reschedule, or cancel meetings with just a few taps—no desktop required. - Real-Time Availability: Syncs with your Cal.com calendar to show open slots and avoid double-booking. - Smart Notifications: Get push alerts for upcoming events, reminders, and confirmations to stay organized. (coming soon) - Easy Integration: Connects seamlessly with your email, video tools, and team calendars for hassle-free collaboration. Perfect for busy professionals, freelancers, and teams who value time. Download now and transform how you manage your schedule—anytime, anywhere! Available on iOS. Free for individuals to download without a subscription.
Screenshots
Verdict
Karbon for Clients and Cal.com both sit at 5.0 stars, but that hides the real split: 100% of Karbon for Clients's written reviews are positive against 62% of Cal.com's. Cal.com's advantage is ratings volume (232 vs 3). On price, rating, update cadence and ads there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
On the App Store both sit at effectively the same score — 5.0 for Karbon for Clients against 4.9 for Cal.com. That said, the two scores are not equally well evidenced: Cal.com has 232 ratings behind it against 3, so its average is the more settled of the two. Written reviews are what separate them: 100% of Karbon for Clients's written reviews are positive against 62% of Cal.com's.
Karbon for Clients ships an update monthly, Cal.com every 4 weeks. The most recent releases landed on October 30, 2026 and November 6, 2026 respectively.
| Parameter | Karbon for Clients | Cal.com |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (3 ratings) — better | 4.9 (232 ratings) |
| Positive reviews | 100.0% of reviews — better | 61.5% of reviews |
| Number of ratings | 3 | 232 — better |
| Update frequency | Monthly | Every 4 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad | iPhone, iPod |
| Requires iOS | 16.4 | 15.1 — better |
| Further details — not scored | ||
| Size | 67 MB | 44 MB |
| Age rating | 4+ | 4+ |
| Developer | Karbon Inc | Cal.com, Inc. |
Customer experience
Karbon for Clients
Cal.com
In-app purchases
Karbon for Clients
No in-app purchases
Cal.com
No in-app purchases









