Oceanodesy vs Clavis
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Oceanodesy
This utility app converts between geodetic and grid coordinate systems. It supports various units for latitude, longitude, and grid coordinates, along with multiple datums and projections for accurate geospatial transformations.
- Geodetic to grid coordinate conversion
- Grid to geodetic coordinate conversion
- Multiple latitude/longitude formats (DD, DMM, DMS)
- Multiple grid coordinate units (US Feet, Intl Feet, Meters)
- Support for multiple datums (WGS84, NAD27, NAD83, etc.)
- Support for multiple projections (UTM, SPCS27, SPCS83)
- Store and export projected coordinates
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Oceanodesy projects and inverses between geodetic coordinates (latitude and longitude) and grid coordinates (easting and northing). Latitude and longitude coordinates are accepted and displayed in Decimal Degrees (DD.dd), Decimal Minutes (DD MM.mm), and Decimal Seconds (DD MM SS.ss). Grid coordinates are accepted and displayed in US Feet, International Feet, and Meters. Projected coordinates can be stored for later reference or export. Available Datums: - World Geodetic System 1984 (WGS84) - North American Datum 1927 (NAD27) - North American Datum 1983 (NAD83) - Sistema de Referencia Geocentrico para las AmericaS 2000 (SIRGAS2000) - Indian 1975 Datum - Hartebeesthoek 1994 Datum - European Datum 1950 Available Projections: - Universal Transverse Mercator (UTM) - State Plane Coordinate System 1927 (SPCS27) - State Plane Coordinate System 1983 (SPCS83)
Clavis
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Planetary Clock is a precise, beautifully simple planetary-hours clock. Since antiquity, each day and night has been divided into twelve unequal hours, each governed by one of the seven classical planets in the Chaldean order. Planetary Clock computes these hours with astronomical accuracy from the true sunrise and sunset in the city you choose. • Current planetary hour — see which planet rules right now, with a live countdown to the next hour. • Apple Watch — the ruling planet and the minutes left in this hour, right on your watch face and in the Smart Stack. Hours are computed on the watch, so it works even when your iPhone is out of reach. • Ruler of the day — the classical planet that governs today. • Upcoming hours — a clear timeline of the planetary hours ahead, from sunrise to sunset and through the night. • Moon phase — the current phase and illumination of the Moon. • Monthly calendar — lunar phases and planetary hours at a glance. • 3D chart — your birth chart rendered in three dimensions, with transits and aspects. • Sync across devices — sign in and your calendar and chart settings follow you. Planetary Clock is a subscription app. A monthly or annual plan unlocks everything, with a free trial when your Apple Account is eligible. No ads, and no tracking. Signing in with Apple or Google keeps your data in step across your devices. You pick your city by searching for it — the app does not use GPS — and every planetary hour is computed from that city's coordinates and time zone, so the same place is used on every device. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: Clavis at every 5 days against Oceanodesy's every 4 weeks. Oceanodesy's advantage is iOS requirement (8.1 vs 16.2). On price, ads, 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Oceanodesy ships an update every 4 weeks, Clavis every 5 days. The most recent releases landed on October 1, 2026 and October 5, 2026 respectively.
| Parameter | Oceanodesy | Clavis |
|---|---|---|
| Price | Free | Free |
| Rating | 4.5 (6 ratings) — better | — |
| Positive reviews | 72.7% of reviews | — |
| Number of ratings | 6 — better | — |
| Update frequency | Every 4 weeks | Every 5 days — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Apple Watch |
| Requires iOS | 8.1 — better | 16.2 |
| Further details — not scored | ||
| Size | 5 MB | 31 MB |
| Age rating | 4+ | 4+ |
| Developer | Oceaneering International, Inc. | Pedro Henrique Oliveira Sousa |
In-app purchases
Oceanodesy
No in-app purchases
Clavis
No in-app purchases









