Tide Charts vs Avisos@IPMA
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Tide Charts
Access worldwide tidal estimates, lunar data, and weather forecasts. Plan outdoor adventures with ease using current radar and offline predictions. Supports Apple Watch and includes a Today Extension for quick access.
- Worldwide tidal estimates
- Lunar data
- Weather forecast
- Current radar
- Offline predictions
- Favorite station management
- Apple Watch support
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Finally a beautiful and simple way to view tides on your mobile device! In addition to worldwide tidal estimates at tide stations, you can see the lunar data, weather forecast, and current radar making your next outdoor adventure as easy to plan as possible. By default, the application will pick the closest tide station to you, but picking a different tide or weather station is as easy as viewing a map of your current location. You can also setup and quickly switch between many stored favorite stations if you need to. No internet access while outdoors? No problem. This app has been designed to give you tidal and lunar predictions without internet access! Tides at a glance • A clear chart of the whole day, with the current height marked and daylight hours shaded (lunar rise and set is the small gray bar on the bottom) • The times and heights of every high and low tide • Swipe left or right to move through the days, or pick a date on the calendar • Swipe down to see sunrise, sunset, moonrise, moonset and the phase of the moon • Subscribe for tide alerts that notify you before a chosen high or low tide • Home Screen widgets with today's tides and the next tide Worldwide Tidal Stations • Nearly 8,000 stations, from the coasts of the United States and Canada to Europe, Japan, Korea, Taiwan, Southeast Asia, Australia, New Zealand, South America and the Pacific islands • Find the nearest station with one tap, search by name, or browse the map, with satellite imagery when you want it • Keep your favorites one tap away Adjustable Height to Match Your Local Tide Table • Heights use the datum your local charts and tables use: MLLW in the United States, chart datum in Canada, Japan and Korea, LAT in Europe and Australia, MLWS in Peru and Ecuador (or you can choose your own from Mean Sea Level, MLLW, MLW, MLWS or LAT) Weather and Radar • Weather forecast is included for the station's location, with wind, temp, precipitation, and the day's high and low • Animated rain radar with a scrubber, so you can see what is coming Apple Watch • A full-screen tide chart on Apple Watch: turn the Digital Crown to step through highs, lows, sunrise, sunset and moon times, or drag to scrub through the next 30 days • Complications for every watch face, from a tide gauge to a chart of the next 24 hours, in the color you choose • Your favorite and nearby stations, with the current height and the next tide Tides is free with ads, however we do offer a one-time purchase to remove them if you would rather a clean distraction free experience.
Avisos@IPMA
Receive real-time weather alerts for potentially hazardous conditions up to 72 hours in advance. The app displays warnings issued by the Portuguese Institute for Sea and Atmosphere, categorized by intensity with a color-coded system.
- Weather risk alerts
- 72-hour forecast
- District-level warnings
- Color-coded intensity
- Multiple weather phenomena
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Esta aplicação disponibiliza os avisos à população em geral para a ocorrência de situações meteorológicas de risco, que nas próximas 72 horas possam causar danos ou prejuízos a diferentes níveis, dependendo da sua intensidade. Os avisos são emitidos pelo Instituto Português do Mar e da Atmosfera, I. P. (IPMA, I. P.) à escala distrital para diferentes parâmetros meteorológicas, segundo uma tabela de cores, que reflecte o grau de intensidade do fenómeno. Os avisos são emitidos em relação às seguintes situações: vento forte, precipitação forte, queda de neve, trovoada, frio, calor, nevoeiro persistente e agitação marítima.
Screenshots
Verdict
The clearest difference is review sentiment: Tide Charts at 69% against Avisos@IPMA's 0%. Tide Charts also leads on rating (4.8 vs 1.0) and ratings volume (115K vs 1). Avisos@IPMA's advantage is in-app purchases (none vs 1) and ads (none vs shown). On price, update cadence, 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
Both are free to download. Tide Charts sells 1 one-off in-app purchase. Avisos@IPMA asks for nothing beyond the download.
Tide Charts holds the better App Store score, 4.8 against 1.0. That said, the two scores are not equally well evidenced: Tide Charts has 115K ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 69% of Tide Charts's written reviews are positive against 0% of Avisos@IPMA's.
Both ship on a similar rhythm, roughly every 3 weeks. The most recent releases landed on November 11, 2026 and November 10, 2026 respectively.
| Parameter | Tide Charts | Avisos@IPMA |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (115K ratings) — better | 1.0 (1 ratings) |
| Positive reviews | 68.9% of reviews — better | 0.0% of reviews |
| Number of ratings | 115K — better | 1 |
| Update frequency | Every 3 weeks | Every 3 weeks |
| Ads | Yes | No — better |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Best chart rank | #35 — better | — |
| Devices | iPhone, iPad, iPod, Apple Watch — better | iPhone, iPad, iPod |
| Requires iOS | 15.1 — better | 15.4 |
| Further details — not scored | ||
| Size | 104 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | 7th Gear | Gisgeo Information Systems, LDA |
Customer experience
Tide Charts
Avisos@IPMA
Bugs and requests
Tide Charts
Reported bugs
4 issues- Tide data off by several hours
- Tide graph not displaying correctly
- App crashing on ad dismissal
- Apple Watch complications freezing
Requested features
5 requests- Ability to set custom locations
- Improved accuracy and data sources
- Option to purchase ad-free version
- Landscape mode support
- More detailed tide height information
Avisos@IPMA
Not enough reviews yet to summarise bugs or requests.
In-app purchases
Tide Charts
- Remove Ads$1.99
Avisos@IPMA
No in-app purchases








