OpenStop vs ZZZ Wake Up!
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OpenStop
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The goal of the app is to collect barrier data in public transportation with your help and make it available on OpenStreetMap so that EVERYONE can benefit from it. By asking simple questions about stops, the app enables citizens to collect data in their surroundings in an accessible way. The data shall be the foundation for better routing especially for impaired people and lead to a renovation of non accessible stops, as well as many other things we ourselves can't even imagine right now. Thank you for your contribution to better public transportation :)
ZZZ Wake Up!
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■ About "ZZZ Wake Up!" This is a simple station alarm app designed to prevent you from missing your stop on the train. Set your destination station in advance, and the app will track your location via GPS, alerting you with a notification and vibration the moment you approach the station. This gives you peace of mind during long commutes to work or school, or even when taking a nap while traveling. ■ Key Features ・Select Your Destination Station — Search by station name across 24 countries worldwide ・Arrival Alert — Reliable notification with sound and vibration ・Adjust Approach Radius — Freely set how many meters before the station the alert sounds ・Smart GPS Monitoring Based on Distance — Power-saving mode when far from the station; precise monitoring as you get closer ・Background Operation — Continues monitoring even when the screen is off or you're using other apps ・Maps App Integration — Simply "Share" station information from your maps app to set your destination ・Available in 13 languages: Japanese, English, German, French, Spanish, Italian, Portuguese, Korean, Thai, Vietnamese, Indonesian, Simplified Chinese, Traditional Chinese ・Switch distance units (metric/imperial) ■ How to Use (3 Steps) 1. Select your destination station — Search by station name or share from your maps app 2. Set the alert radius — Use the slider to set how many meters before the station you want to be alerted 3. Tap the "Start Monitoring" button — Then you can turn off the screen and take a nap ■ Recommended for ・People who tend to oversleep during their commute to work or school ・People who frequently take long train rides for business trips or travel ・Those who use overnight or long-distance trains ・Those traveling by rail overseas ・Those worried about accidentally falling asleep at transfer stations ■ Supported Areas Supports train stations in 24 countries worldwide, including Japan (featuring over 400 stations per country). [Asia] Japan, China, South Korea, Taiwan, Thailand, Indonesia, Vietnam [Europe] Germany, France, Italy, United Kingdom, Spain, Switzerland, Austria, Netherlands, Belgium, Czech Republic, Norway [North America] United States, Canada [South America] Argentina, Brazil, Chile [Oceania] Australia ■ Required Permissions This app uses the following permissions to determine when you are approaching your destination station. ・Location Services (including background) — Required to calculate the distance to your destination station ・Notifications — Required to display alerts when you are approaching Location data is used solely for distance calculations within the device and is not sent to external servers. ■ Important Notes ・GPS accuracy depends on the surrounding environment (e.g., underground, tunnels, between buildings). Detection may be delayed in areas with poor signal reception. ・This app will not function properly on subways because GPS signals cannot be received inside the train. We recommend using this app on above-ground lines. ・Continuous use of GPS will increase battery consumption compared to normal app usage. ・Depending on train operations and the location of the train car, the alert may sound several tens of seconds before arrival at the station, rather than immediately upon arrival. ・To ensure you receive alerts reliably, please check your device's notification sound and vibration settings and disable silent mode before using the app. ■ About Ads To provide this app for free, we display ads (via a third-party ad network). In the EU, a consent form will appear upon first launch in accordance with the GDPR. ■ Privacy The location data collected is used solely for alert determination and is not sent to third parties, including the developer. Please refer to the Privacy Policy for details. Privacy Policy: https://smolt-stage.com/home/privacy/zzz-okiroyo-privacy-policy-ios-en.html
Screenshots
Verdict
The clearest difference is ads: OpenStop at none against ZZZ Wake Up!'s shown. ZZZ Wake Up!'s advantage is update cadence (every 2 months vs every 8 months) and iOS requirement (13.0 vs 15.0). On price, 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.
OpenStop ships an update every 8 months, ZZZ Wake Up! every 2 months. The most recent releases landed on November 8, 2026 and October 31, 2026 respectively.
| Parameter | OpenStop | ZZZ Wake Up! |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 8 months | Every 2 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.0 | 13.0 — better |
| Further details — not scored | ||
| Size | 42 MB | 56 MB |
| Age rating | 4+ | 4+ |
| Developer | Technische Universitaet Chemnitz | SMOLT STAGE, K.K. |
In-app purchases
OpenStop
No in-app purchases
ZZZ Wake Up!
No in-app purchases








