Comparison

Celtic Tree Calendar vs Celestium

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

Head to head
About

Celtic Tree Calendar

Explore your birth tree and its associated Ogham letter, folklore, and meaning. This app offers beautifully illustrated botanical artwork and genuine Ogham scholarship, allowing you to discover the Celtic Tree Year and share tree cards with friends. It works offline and is private by design.

Highlights
  • Discover your birth tree and Ogham letter
  • Interactive Celtic Tree Year wheel
  • Gallery of original botanical illustrations
  • Deep lore for each sign
  • Authentic Ogham information
  • Home-screen widgets
  • Share tree cards
Features
Currently charting
Read full description

Discover the tree that rules your birth. The Celtic Tree Calendar gives a tree, and an ogham letter, to each of thirteen months of the year, every one with its own character, folklore and meaning. Find your sign, read its story, and turn through the whole year tree by tree. This is a complete, ground-up rebuild of the original app, pairing brand-new hand-painted botanical artwork with genuine ogham scholarship. FEATURES • Today: your current tree, beautifully illustrated, with its ogham letter, dates and reading. • The Celtic Tree Year: an interactive wheel you can spin through all thirteen signs, landing on any tree. • Trees: a gallery of original botanical illustrations, a unique painting for every sign. • Deep lore for each sign: meaning, mythology, folklore, traditional woodland uses, and the reading for those born in its time. • Authentic ogham: each sign's word-ogham (its kenning), plus the medieval colour-ogham and bird-ogham. • Home-screen widgets: see the tree of the day at a glance, in small and medium sizes. • Share: send a beautiful card of any tree to friends. • An optional daily reminder of the tree of the day. BEAUTIFUL, AND HONEST Every tree is a unique botanical illustration of its real species, from the papery silver birch to the mighty acorn-laden oak. And we tell the tradition straight: the tree calendar was devised by the poet Robert Graves in 1948, not by the ancient druids. But the trees, their ogham letters, and their folklore are genuine, and we cite our sources throughout. PRIVATE BY DESIGN No ads. No tracking. No subscriptions. No in-app purchases. Buy it once and keep it forever. Everything works offline. A companion to Wiccan Moon and Mansions of the Moon.

About

Celestium

Explore personalized astrological insights for life's decisions. Discover ideal locations for love, work, and growth, and understand daily cosmic weather. Engage in guided rituals and connect with others through shared astrological charts.

Highlights
  • Location scoring for love, work, vitality, and growth
  • Daily cosmic weather and moon phase tracking
  • Guided rituals for moon phases
  • Couples and group chart analysis
  • On-device chart computation with no tracking
  • AI interpretations via user's Anthropic API key
Features
Read full description

Celestium isn't a horoscope written for millions at once. It's your actual birth chart, the real sky of the moment you were born, read alongside the traditions that have studied the sky longest. A compass through life, not a crystal ball. YOUR SKY REPORT Each New Moon, a report gathers what you wrote, the sky it met, the patterns that keep coming back, and what returns next. A Yearly report arrives at your solar return. Tell it "This landed" or "Not me" and it listens. The report and everything you wrote are free. THE TRADITIONS Western astrology from Hellenistic to modern, Vedic charts, BaZi, the Maya Tzolkin, Tibetan astrology, the Tong Shu almanac, Feng Shui flying stars, Hermetic Qabalah with your tarot birth cards, numerology, tarot and the I Ching. Choose the ones that speak to you; the app follows your choice. YOUR OWN RECORD Journal, check in, and edit any entry later. Each entry keeps the sky it was written under, so when that sky returns you can see what you wrote last time. Tag by feeling, milestone and tradition, and related entries gather into threads. YOUR CHART, PIECE BY PIECE Blueprint teaches each placement, angle and aspect, then asks you to name how it lives in you, until it is yours and not just words on a page. WHERE YOU THRIVE Your chart mapped onto the whole planet. Score thousands of cities for love, work, vitality and growth, compare them side by side, and trace the Lots too, Fortune, Spirit and six more. WHEN TO ACT Daily sky, moon phases and the transits touching your chart, from today out to the year. Electional timing reads three ways, Medieval, Hellenistic and Vedic, with the conditions each tradition names. A FULL READING, NO AI NEEDED A complete natal reading composed on your device from a deep interpretation library. Optional AI interpretations work with your own Anthropic API key, so your chart goes straight to Anthropic, never through us. SHOWS ITS WORK Every technique names its sources: the tradition, the text it rests on, and the method behind the number. Zodiacal releasing, firdaria, profections, returns, horary, progressions, solar arc, BaZi, Vedic, Feng Shui, the Maya Tzolkin, numerology, Hermetic Qabalah and tarot all cite the lineage they come from. RITUAL, DIVINATION AND SKY LETTERS Guided practices for each moon phase. Draw a tarot spread or cast the I Ching. Seal a letter to a later self under tonight's sky; it opens when the moment you choose returns. TOGETHER Synastry, composite and the places that hold you both, or group mode for three to six. Invites are encrypted end to end. REAL ASTRONOMY, NOTHING LINKED TO YOU Positions come from a built-in VSOP87 engine, not a borrowed API. Your chart is computed on your device. There is no account, nothing the app collects is linked to you, and Settings can erase everything. Celestium Premium opens the full app: unlimited saved charts, couples and group mode, the full city atlas, export and shareable cards, deeper Sky Reports, and the full depth of Blueprint, your reading and the year ahead. Subscribers can also use Premium on the web. Astrology here is for reflection, not prediction. A way to read the weather instead of a forecast you have to obey. If you have any issues please reach out to us at jhinna@withjhinna.com Privacy Policy: https://celestium.me/privacy Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Celtic Tree Calendar4 screens
Celestium4 screens

Verdict

The call

The clearest difference is review sentiment: Celestium at 100% against Celtic Tree Calendar's 0%. Celestium also leads on price (Free vs $0.99) and update cadence (every 5 days vs every 3 weeks). Celtic Tree Calendar's advantage is in-app purchases (none vs 2) and chart position (#190 vs unranked). On ads, device support and iOS requirement 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

Celestium is free to download; Celtic Tree Calendar costs $0.99 up front. Celestium sells 2 in-app purchases, starting at $6.99 per month. Celtic Tree Calendar asks for nothing beyond the download.

UpkeepUpdate frequency

Celtic Tree Calendar ships an update every 3 weeks, Celestium every 5 days. The most recent releases landed on November 6, 2026 and October 31, 2026 respectively.

Scorecard6 real differences · 5 level
Celtic Tree Calendar versus Celestium: the parameters behind the verdict, then further details
ParameterCeltic Tree CalendarCelestium
Price$0.99Free — better
Rating—5.0 (4 ratings) — better
Positive reviews0.0% of reviews100.0% of reviews — better
Number of ratings—4 — better
Update frequencyEvery 3 weeksEvery 5 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFreemium — better
Best chart rank#190 — better—
DevicesiPhone, iPadiPhone, iPad, Mac — better
Requires iOS18.017.0 — better
Further details — not scored
Size33 MB146 MB
Age rating4+4+
DeveloperStuart WoolleyJhinna Salinas

Customer experience

Celtic Tree Calendar

Written reviews10 reviews
Positive0.0%
Neutral10.0%
Negative90.0%

Celestium

All ratings4 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

Celtic Tree Calendar

No in-app purchases

2 purchases

Celestium

Subscriptions2
  • Premium Monthly3 Days trial$6.991 Month
  • Premium Yearly3 Days trial$42.991 Year

Questions

Is Celtic Tree Calendar free?
Celtic Tree Calendar costs $0.99, with no in-app purchases.
Is Celestium free?
Celestium is free to download, with in-app purchases available.
Do Celtic Tree Calendar or Celestium have ads?
Neither Celtic Tree Calendar nor Celestium shows ads.
Which is updated more often, Celtic Tree Calendar or Celestium?
Celtic Tree Calendar ships an update every 3 weeks, and Celestium every 5 days. Most recently, Celtic Tree Calendar was updated on November 6, 2026 and Celestium on October 31, 2026.

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