Chronogram vs SiCal
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Chronogram
This app facilitates collaborative event planning and sharing for both individuals and organizations. It allows users to discover and connect with events, manage personal schedules, and helps organizations engage their audience by publishing events directly to followers' calendars.
- Collaborative event creation
- Event sharing and discovery
- Personal event scheduling
- Organization event publishing
- Follow organizations of interest
- Minimize scheduling conflicts
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Personal and organizational event creation, collaboration, and sharing platform. Chronogram is an online collaborative event-sharing and customer engagement platform. Chronogram helps individual users and businesses discover and connect with each other and structure their events in a calendarized format for easy viewing, sharing, and collaboration. Chronogram helps people get events from organizations they care about published directly on their calendar. Event planning and sharing are two important steps in hosting a successful event of any size. Chronogram makes event planning, sharing, and collaboration very easy! Being able to use predictive analytics and take data-driven actions by event hosting companies can dramatically improve the discovery and reach of their target customers. Individual users can schedule their personal and family events, and manage appointments. Chronogram users can discover & follow organizations of interest. View their personal and social events - all in one calendar and never miss an RSVP. Chronogram enables organizations build targeted follower base and directly publish their events on followers’ calendar. Collaborate with other organizations & minimize scheduling conflicts.
SiCal
This private calendar app utilizes a decentralized network for secure storage and management of your schedule. It allows for event creation, organization across multiple calendars, and import of existing files, all without requiring a traditional account. Your data is secured by a recovery phrase for easy restoration and control.
- Decentralized calendar storage
- Event creation and organization
- Multiple calendar management
- ICS file import
- Event reminders and alerts
- Restore access with recovery phrase
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SiCal is a private calendar app built on the decentralized Sia network. Create, organize, and manage your schedule without relying on a traditional central server or account-based calendar platform. With SiCal, you can create and edit events, manage multiple calendars, import calendar files like ICS, and stay on top of your schedule with event reminders and alerts. Your calendar data is tied to your recovery phrase, giving you a portable way to restore access and keep control of your information. Key features: -Decentralized calendar storage powered by Sia -Create, edit, and organize events across calendars -Import existing calendar files including ICS -Event reminders and alerts -Sync support to keep your calendar up to date -Restore access with your recovery phrase -No traditional account required -SiCal is designed for people who want a calendar that is practical, mobile-friendly, and more aligned with user ownership and privacy. This app was funded by a grant from the Sia Foundation.
Screenshots
Verdict
The clearest difference is ratings volume: Chronogram at 17 against SiCal's 1. SiCal's advantage is iOS requirement (13.0 vs 15.6). 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 Chronogram against 5.0 for SiCal. That said, the two scores are not equally well evidenced: Chronogram has 17 ratings behind it against 1, so its average is the more settled of the two.
Chronogram ships an update every 2 weeks, SiCal every 9 days. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.
| Parameter | Chronogram | SiCal |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (17 ratings) | 5.0 (1 ratings) |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 17 — better | 1 |
| Update frequency | Every 2 weeks | Every 9 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 15.6 | 13.0 — better |
| Further details — not scored | ||
| Size | 37 MB | 33 MB |
| Age rating | 17+ | 4+ |
| Developer | Chronogram LLC (U.S.) | Mitchell May |
In-app purchases
Chronogram
No in-app purchases
SiCal
No in-app purchases









