Absolute Tides vs AirmarCAST™
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Absolute Tides
Access official UKHO tidal data offline for up to a year in advance. View monthly tide tables, daily charts, and tidal streams. Includes weather forecasts and anchoring assistance.
- Offline UKHO tidal data
- Annual data plugins
- Monthly tide tables
- Daily tide charts
- Tidal stream view
- Met Office weather forecast
- Anchoring assistance
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Displays officially licenced UKHO tidal data on an annual basis without ever needing to go online. The tidal data is contained in our annual data plugins and must be purchased using in-app purchases. Once you have purchased the data, this app will allow you to view UKHO standard port tides up to a year in advance. The app will also calculate secondary port tides using its own built in offsets. (The 'UK data 2016' IAP contains data for 38 primary ports and over 500 secondary ports, see our website for more details on coverage) The main view is an 'At a glance' table view of each month's tides and tidal ranges. Selecting an entry will display an easy to use daily chart view showing the tide height for any time of day and a tidal stream view showing tidal direction and speed at hourly intervals. The Weather section downloads and displays the current Met Office Inshore Forecast. Absolute Tides also makes anchoring easy by calculating the maximum and minimum tides beween the current time and any selected future date/time. Note: This application will NOT work without at least one of our tidal data in-app purchases being installed. Please check that the tide data you want is available before downloading this app. The small print: For leisure use only. Heights of tides can vary from those predicted depending on the prevailing weather conditions. All data is given in good faith and is believed to be correct but we accept no responsibility for any consequential loss or damage arising from use of this application. Secondary port data calculated using offsets will be less accurate than the UKHO standard port data. This app is neither affiliated to nor endorsed by the Met Office.
AirmarCAST™
Configure and calibrate your boat's Bluetooth-enabled multisensors and modules directly from your mobile device. View real-time data on detailed gauges and perform advanced calibrations for speed, temperature, and attitude without extra hardware.
- Bluetooth sensor connection
- Real-time data display
- Intuitive navigation
- Speed, temperature, attitude calibration
- On-board GPS speed comparison
- Advanced speed calibration wizards
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Airmar® CAST™ connects to the Bluetooth®-enabled DST810, DX900+, WX300 multisensors and SmartBoat® modules on your boat, making sensor configuration and calibration easy with intuitive app navigation and real-time data from your multisensor. View data on detailed gauges and digital data screens, and perform speed, temperature, and attitude calibrations without the need for additional converters or cables. With CAST, you can configure your multisensor directly, regardless of the other displays and gauges on board. All data configurations and calibrations are stored in the multisensor and delivered on the NMEA2000® network. When used with DST810, you can calibrate basic or heel-compensated speed through water using your on-board GPS speed for comparison. Intuitive wizards guide you through multiple runs to correct for current. Or take it a step further to advanced speed calibration, with up to five heel angles and ten reference speeds. Until now, advanced speed calibration was only possible through expensive PC based software. With Airmar’s SmartBoat® modules, the CAST app delivers the fastest connection to the SmartView software for system configuration.
Screenshots
Verdict
The clearest difference is review sentiment: Absolute Tides at 67% against AirmarCAST™'s 25%. AirmarCAST™'s advantage is in-app purchases (none vs 11). On price, update cadence, ads 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. Absolute Tides sells 11 one-off in-app purchases. AirmarCAST™ asks for nothing beyond the download.
Absolute Tides ships an update every 5 months, AirmarCAST™ every 3 months. The most recent releases landed on October 16, 2026 and October 11, 2026 respectively.
| Parameter | Absolute Tides | AirmarCAST™ |
|---|---|---|
| Price | Free | Free |
| Rating | — | 2.6 (5 ratings) — better |
| Positive reviews | 67.1% of reviews — better | 25.0% of reviews |
| Number of ratings | — | 5 — better |
| Update frequency | Every 5 months | Every 3 months — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.6 — better | 16 |
| Further details — not scored | ||
| Size | 30 MB | 112 MB |
| Age rating | 4+ | 4+ |
| Developer | Darren Edwards | Airmar Technology Inc. |
Customer experience
Absolute Tides
AirmarCAST™
Bugs and requests
Absolute Tides
Reported bugs
10 issues- App stopped working after 2025/2026 update
- App crashes when selecting River Tyne ports
- App crashes immediately on opening with 2024 data
- Tyne ports cause app to disappear and require reinstallation
- App crashes on iPad when clicking 'Streams'
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- App crashes on opening after iPhone update
- App crashes on iPhone 6
- App crashes on opening
- App stops working at the end of the year
- App crashes when loading data
Requested features
10 requests- Version covering full French Brittany & Atlantic coasts using SHOM charts
- Indication of Standard vs. Secondary port in tide time display
- Include Fleetwood or more detailed Morecambe Bay data
- Map showing port locations
- Apple Watch complication
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- Full 12 months of data for subscription
- Constant view of at least the next 6 months
- Larger print/double-sized display for day selection
- Ability to restore purchases after losing a phone
- Option to purchase data for specific regions or a full year upfront
AirmarCAST™
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Absolute Tides
- UK Tides 2016Free
- UK Tides 2017Free
- UK Tides 2018Free
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- UK Tides 2019Free
- UK & Eire Tides 2020Free
- UK & Eire Tides 2021Free
- UK & Eire Tides 2022$2.99
- UK & Eire Tides 2023$2.99
- UK & Eire Tides 2024$2.99
- UK & Eire Tides 2026$2.99
- UK & Eire Tides 2025$2.99
AirmarCAST™
No in-app purchases








