Comparison

SurfaceONE vs Caldera

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

Head to head
About

SurfaceONE

This application allows users to remotely control the edelkrone SurfaceONE device. It enables programming of targeted slides, linear slides, and smooth panning movements for enhanced creative control.

Highlights
  • Remote control for SurfaceONE
  • Program targeted slides
  • Program linear slides
  • Smooth pan control
  • Device integration
Features
Read full description

Remote control application for edelkrone SurfaceONE. Easily control the main features of SurfaceONE, program targeted slides, linear slides and smooth pans. Learn more about SurfaceONE from edelkrone.com/surfaceone

About

Caldera

This app offers daily esoteric guidance based on celestial events and alchemical traditions. It provides contemplative practices, daily readings, and a sacred calendar to aid in personal inner work and spiritual development.

Highlights
  • Daily alchemical teachings
  • Celestial current readings
  • Living sky data
  • Sacred calendar
  • Interactive birth chart
  • Contemplative practices
Features
Read full description

Caldera is an esoteric companion for the daily Great Work. This is not a horoscope app. Caldera is for those who treat the day as material for inner work — meditation, purification, the slow refining of the self. Each morning it reads the living sky — the ruling planet, the moon's phase, the hour, the aspects at play — and draws on the Hermetic and alchemical traditions to offer something worth sitting with, and something worth practicing. As above, so below. As within, so without. THE GREAT WORK A daily alchemical teaching that moves through the stages of the opus — Nigredo, Albedo, Citrinitas, Rubedo. Each arrives with contemplative practices and is drawn from the source texts, so the work stays rooted in the tradition rather than invented. THE DAILY ORACLE A full reading of the day's celestial currents — its quality, its themes, what to tend and what to leave be — closing with practical guidance for your practice. Not prediction. Orientation. THE LIVING SKY The planet and hour that rule now, the moon's phase and mansion, the aspects forming overhead, retrogrades and void-of-course windows, and the fixed stars when they touch a planet. Plus the correspondences of the day — its colors, stones, metals, and incense — for those who keep an altar or a ritual. THE SACRED CALENDAR The turning year laid out: lunations, eclipses, planetary stations, void Moon, and holy days across the traditions — so you can time your practice to the sky. YOUR BIRTH CHART An interactive natal wheel with sign table, aspects, and a clear glossary. See the long cycles and outer-planet transits shaping this passage of your life — named plainly, so you can work with them. FOR THE PRACTICE • Core sky computed on your device — quiet and private • Sign in with Apple, optional — no account needed • Daily reminders for the sky's aspects, the day's guidance, and its focus — each on your own hour • Thirteen contemplative palettes, light and dark, with widgets and Apple Watch complications for moon, day, and sky CALDERA PLUS The daily essentials are free. Plus opens the depth: • The Great Work — the full alchemical teachings and practices • The complete Daily Oracle • The Sacred Calendar beyond today, and your personal transits • An ad-free, undistracted space • Every palette and the Sacred Calendar widget Monthly or yearly, through your Apple ID. Cancel anytime. Caldera is for the seeker, not the scroller. Unhurried, rooted in tradition, and made to be returned to each day. Terms of Use: https://aquarionlabs.com/caldera-terms

Screenshots

SurfaceONE1 screens
Caldera4 screens

Verdict

The call

The clearest difference is review sentiment: Caldera at 100% against SurfaceONE's 29%. Caldera also leads on rating (5.0 vs 3.0). SurfaceONE's advantage is in-app purchases (none vs 3) and ads (none vs shown). On price, update cadence 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

Both are free to download. Caldera sells 3 in-app purchases, starting at $5.99 per month. SurfaceONE asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Caldera holds the better App Store score, 5.0 against 3.0. That said, the two scores are not equally well evidenced: SurfaceONE has 5 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 29% of SurfaceONE's written reviews are positive against 100% of Caldera's.

UpkeepUpdate frequency

SurfaceONE ships an update monthly, Caldera every 3 weeks. The most recent releases landed on June 3, 2026 and September 20, 2026 respectively.

Scorecard7 real differences · 3 level
SurfaceONE versus Caldera: the parameters behind the verdict, then further details
ParameterSurfaceONECaldera
PriceFreeFree
Rating3.0 (5 ratings)5.0 (1 ratings) — better
Positive reviews28.6% of reviews100.0% of reviews — better
Number of ratings5 — better1
Update frequencyMonthlyEvery 3 weeks — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, Apple Watch
Requires iOS10.2 — better17.0
Further details — not scored
Size41 MB28 MB
Age rating4+4+
Developeredelkrone USA INCCEREN DASTANOGLU

Customer experience

SurfaceONE

Written reviews7 reviews
Positive28.6%
Neutral0.0%
Negative71.4%

Caldera

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

None

SurfaceONE

No in-app purchases

3 purchases

Caldera

Subscriptions2
  • Plus$5.991 Month
  • Plus Yearly$59.991 Year
One-time1
  • Expert Birth Chart Reading$49.99

Questions

Is SurfaceONE free?
SurfaceONE is free to download, with no in-app purchases.
Is Caldera free?
Caldera is free to download, with in-app purchases available.
Which has better reviews, SurfaceONE or Caldera?
Caldera is rated higher. SurfaceONE averages 3.0 out of 5 from 5 ratings, while Caldera averages 5.0 from 1 ratings.
Do SurfaceONE or Caldera have ads?
Caldera shows ads; SurfaceONE does not.
Which is updated more often, SurfaceONE or Caldera?
SurfaceONE ships an update monthly, and Caldera every 3 weeks. Most recently, SurfaceONE was updated on June 3, 2026 and Caldera on September 20, 2026.

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