SailTimer API™ vs GPS Metrics
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
SailTimer API™
This app bridges the gap between your SailTimer Wind Instrument and other navigation or performance apps. It also offers access to crowdsourced wind maps and marine weather animations through a subscription, enhancing your sailing experience with real-time wind data.
- Integrates with SailTimer Wind Instrument
- Delivers wind data to partner apps
- Crowdsourced wind maps
- Marine weather animations
- Supports chartplotter apps
- Real-time wind data
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This app allows you to use SailTimer products in other partner apps. First, if you have the wireless SailTimer Wind Instrument (www.SailTimerWind.com), this app can receive the transmissions and deliver them to other apps for viewing. Use this app with the the SailTimer™ chartplotter app, or with lots of other navigation, wind gauge or performance apps (https://wi-rb.com/apps/). But what if you want to see what the wind is doing up ahead, or around the next point? Then you need our crowdsourced wind maps and marine weather animations. You can get the low-cost subscription here, to view our marine weather animations in partner apps. We'll add a growing list of partner apps at https://SailTimer.boats App web page: https://wi-rb.com/api. If you have a question or feedback please email info@SailTimer.co - we’re here to help. If you are getting the app and like this wireless technology, please help out other sailors by letting them know with a quick rating on this version while you’re here.
GPS Metrics
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GPS Metrics is your compact and accurate companion on the move. See live speed, altitude, course and more, visualize your track on the map with color by speed, export GPX/KML, and send NMEA sentences over your local network to other devices or software. Highlights: • Live metrics: speed, (barometric) altitude, climb/descent rate, course, rate of turn, heading (true/magnetic), horizontal/vertical accuracy and timestamp. • Map with speed trail: track segments are color‑coded by average speed. • Export: save your trip as GPX or KML. • NMEA output: send RMC, GGA, GSA, VTG and GLL via TCP server or UDP sender (local network). • Coordinates: choose DD, DM, DMS, UTM or MGRS. • Units: metric or imperial. • Averaging window: smooth speed and climb/descent with a configurable time window. • Battery friendly: enable “Battery Saving Mode” to use significant‑change updates. • Keep screen awake during your trip. • Theme: follow system or pick light/dark. Privacy • Your location stays on your device unless you explicitly export or enable NMEA output to a device you choose on your local network. No account, no tracking, no ads. Requirements • Location permission is required for metrics and track. Local Network permission is required for NMEA output. No subscription! No tracking! No ads!
Screenshots
Verdict
The clearest difference is in-app purchases: GPS Metrics at none against SailTimer API™'s 6. SailTimer API™'s advantage is update cadence (every 4 weeks vs every 9 months). On price, 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
Both are free to download. SailTimer API™ sells 6 in-app purchases, starting at $2.99 per month. GPS Metrics asks for nothing beyond the download.
SailTimer API™ ships an update every 4 weeks, GPS Metrics every 9 months. The most recent releases landed on August 19, 2026 and September 14, 2026 respectively.
| Parameter | SailTimer API™ | GPS Metrics |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 0.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 4 weeks — better | Every 9 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 16.6 | 16.1 — better |
| Further details — not scored | ||
| Size | 19 MB | 7 MB |
| Age rating | 4+ | 4+ |
| Developer | SailTimer Inc. | Berend Hartman |
In-app purchases
SailTimer API™
- Crowdsourced Wind Maps - Monthly7 Days trial$2.991 Month
- WNI Marine Weather - Monthly7 Days trial$2.991 Month
- AI Forecasts - Monthly7 Days trial$2.991 Month
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- Crowdsourced Wind Maps - Yearly7 Days trial$19.991 Year
- WNI Marine Weather - Yearly7 Days trial$19.991 Year
- AI Forecasts - Yearly7 Days trial$19.991 Year
GPS Metrics
No in-app purchases









