TOPO.app vs Narvi Flow
Price, ratings, monetisation and update history for both apps, side by side โ with what reviewers say about each.
TOPO.app
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Our TOPO product family is the only radar system that can offer axle detection along with length and speed measurement. Its recording and classification functions โ including an additional microphone for pinpointing the position of the engine block โ open up new dimensions in traffic data capture. Our devices can be used on roads inside and outside of urban areas. They can be integrated in a standard reflector post or installed on various pole systems.
Narvi Flow
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Feel control with the Narvi Flow Wifi electric sauna heater controller and app! With the Narvi Flow app, you can control and manage your electric sauna heater remotely using your mobile device or smart device. The app is designed for use with Narvi sauna heaters equipped with the Narvi Flow Wifi controller/control system. Turn your sauna on with a single press โ anytime, anywhere. Open the app on your mobile device, set a timer, and perfect sauna heat will be waiting for you when you arrive. The app also provides notifications and allows you to monitor the status of the sauna room. Narvi Flow app features: - Control and management of the sauna heater - Turn the heater on and off using a smartphone or tablet - Temperature adjustment (40โ115ยฐC) - Pre-set start timer for the heater (up to 6 hours) - Heater registration - Works only with the Narvi Flow Wifi control system - Requires a safety device (Narvi door switch) - Free app
Screenshots
Verdict
The clearest difference is update cadence: Narvi Flow at every 4 weeks against TOPO.app's every 2 months. Narvi Flow also leads on iOS requirement (13.0 vs 16.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price ยท Rating ยท Positive reviews ยท Number of ratings ยท Update frequency ยท Ads ยท In-app purchases ยท Monetization ยท Best chart rank ยท Devices ยท Requires iOS
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
TOPO.app ships an update every 2 months, Narvi Flow every 4 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.
| Parameter | TOPO.app | Narvi Flow |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 4 weeks โ better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 16.6 | 13.0 โ better |
| Further details โ not scored | ||
| Size | 37 MB | 32 MB |
| Age rating | 4+ | 17+ |
| Developer | RTB Elektronik | Narvi Oy |
In-app purchases
TOPO.app
No in-app purchases
Narvi Flow
No in-app purchases









