Comparison

StelaClock vs US Calendar

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

StelaClock

Discover the Mayan calendar and number system with this educational clock app. It displays the current time and date using Mayan glyphs and a Base 20 notation, offering a unique way to experience ancient Maya culture.

Highlights
  • Mayan calendar display
  • Mayan number system
  • Vigesimal (Base 20) notation
  • Sophisticated calendar converter
  • Mayan glyph numerals
  • Daily use clock
Features
Read full description

Explore the world of the Mayan calendar — and keep a beautiful day clock for everyday curiosity. StelaClock is a modern rebuild of the classic Mayan-inspired clock: a living Tzolk’in wheel for today, Long Count and Haab alongside it, and a Gregorian → Mayan date converter. Educational and contemplative — not fortune-telling. No account. No subscription. Everything runs on your iPhone. TODAY — YOUR LIVING CLOCK • See today’s day sign, tone, and glyph on a multi-ring Tzolk’in wheel • One-line energy for the day — gentle reflection, not a full reading engine • Current Cycles show Long Count place values (bak’tun · k’atun · tun) in progress • Day tones use classic bar-and-dot Mayan numerals • The highlighted kin (sign + tone) changes once per local calendar day at midnight • The gentle wheel spin is decorative only — hours and minutes do not advance the calendar CONVERT — ANY DATE • Pick a Gregorian date • Instant Tzolk’in (sign + tone), Haab, Long Count, and Calendar Round • Copy or Share results for notes, travel, or study • Convert historical dates too — including milestones such as the bak’tun completion of December 21, 2012 — as calendar history, not a live countdown EXPLORE — MOVE THROUGH THE CYCLE • Step day by day or jump ±13 (Wavespell) and ±260 (full Tzolk’in round) • Ring, timeline, and grid views of the same selected date • Optional Haab and Long Count labels, plus why the date matters (trecena, year bearer, night lord) PROFILES — LIGHT & LOCAL • Save up to 30 people with birth dates • Birth signature, upcoming alignment / return days, and optional mood history • Data stays on your device PRIVATE BY DESIGN • No login, no cloud account, no ads SDK • Optional daily reminder via Apple’s local notifications (you choose the time) • Themes: Mystic, Minimal, and Stone FOR LEARNING AND REFLECTION StelaClock uses classical Mayan calendar math (GMT correlation 584283). The Long Count uses the Maya’s modified base-20 (vigesimal) place values — shown as readable cycle fields, not a digital hours-and-minutes wall clock. Results can differ from other apps or traditions. Content is educational and entertainment — not medical, financial, legal, or professional advice, and not a substitute for living cultural teaching. Apple Watch and widgets are planned for a later update — not included in this release. Privacy Policy: https://mayanchart.com/privacy Terms of Use: https://mayanchart.com/terms Support: support@mayanchart.com

About

US Calendar

Features
Read full description

US Calendar: Holidays and School Holidays A calendar app with United States public holidays and school holidays by state. Features: >All Public Holidays: Federal holidays and state-specific holidays across all 50 states and the District of Columbia. View holidays for your state or all states. >School Holidays: School holiday periods by state, clearly marked on the calendar. Toggle school holidays on/off in settings. >State Selection: Filter holidays by your state or view all. Choose from Alabama, Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Rhode Island, South Carolina, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Washington, West Virginia, Wisconsin, Wyoming, or District of Columbia. >Personal Notes: Add notes to any date to track events, reminders, and important information. Notes are stored locally on your device. >Notifications: Set reminders for your notes to never miss important events. >Year View: Navigate quickly to any month or year. >Offline Access: All holiday data is included in the app—no internet required. >Dark Mode: Light and dark themes available. Useful for planning daily activities and staying informed about public and school holidays across the United States.

Screenshots

StelaClock4 screens
US Calendar4 screens

Verdict

The call

The clearest difference is price: US Calendar at Free against StelaClock's $3.99. US Calendar also leads on update cadence (every 2 weeks vs every 29 months) and iOS requirement (15.0 vs 26.0). StelaClock's advantage is ads (none vs shown). On in-app purchases and device support 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

CostPrice · In-app purchases · Ads · Monetization

US Calendar is free to download; StelaClock costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

StelaClock ships an update every 29 months, US Calendar every 2 weeks. The most recent releases landed on October 10, 2026 and October 13, 2026 respectively.

Scorecard4 real differences · 6 level
StelaClock versus US Calendar: the parameters behind the verdict, then further details
ParameterStelaClockUS Calendar
Price$3.99Free — better
Rating4.6 (5 ratings) — better—
Positive reviews85.7% of reviews—
Number of ratings5 — better—
Update frequencyEvery 29 monthsEvery 2 weeks — better
AdsNo — betterYes
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS26.015.0 — better
Further details — not scored
Size7 MB24 MB
Age rating4+4+
DeveloperGary SagguPoornima Arachchige

In-app purchases

None

StelaClock

No in-app purchases

None

US Calendar

No in-app purchases

Questions

Is StelaClock free?
StelaClock costs $3.99, with no in-app purchases.
Is US Calendar free?
US Calendar is free to download, with no in-app purchases.
Do StelaClock or US Calendar have ads?
US Calendar shows ads; StelaClock does not.
Which is updated more often, StelaClock or US Calendar?
StelaClock ships an update every 29 months, and US Calendar every 2 weeks. Most recently, StelaClock was updated on October 10, 2026 and US Calendar on October 13, 2026.

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