LightFi Air vs HiiTRAIN
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
LightFi Air
Monitor your indoor air quality by displaying live Carbon Dioxide (CO₂) levels and other sensor data from connected devices. The app helps you understand your environment's impact on health, well-being, and productivity, suggesting actions like increasing ventilation when levels are high.
- Live CO₂ level display
- Monitors multiple sensors
- Customizable sensor names
- Sorts sensors by distance
- Health and productivity insights
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This app displays live indoor Carbon Dioxide (CO₂) levels and other sensor data measured by LightFi sensors. Multiple sensors can be monitored simultaneously. You can give each sensor a unique name. When it scans the app sorts each sensor by approximate distance nearest first. It is important to monitor your indoor CO₂ levels for your health, well-being, and productivity. Research from Harvard University shows that continuous exposure to high CO₂ levels can diminish productivity, cause headaches, and increase the risk of viral transmission. When indoor CO₂ levels are high please increase fresh air flow, by opening a window for example.
HiiTRAIN
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DESIGNED FOR THE BUSY INDIVIDUAL: YOUNG PROFESSIONAL, MOTHERS, BUSINESS TRAVELER, A TIME EFFICIENT, RESULT DRIVEN PROGRAMME THAT WILL IMPROVE YOUR STRENGTH, ENDURANCE AND CONFIDENCE. BECOME A HiiBRYD ATHLETE BY TRAINING WITH HiiCLUB. 7 DAYS OF WORKOUTS, CONSISTING OF OUR SIGNATURE SESSIONS. HiiJACKED, HiiBRYD & HiiRUN. DESIGNED FOR THE BUSY INDIVIDUAL ALL SESSIONS ARE NO LONGER THAN 60 MINUTES GIVING YOU TIME EFFICIENT, EFFECTIVE TRAINING.
Screenshots
Verdict
The clearest difference is iOS requirement: LightFi Air at 12.4 against HiiTRAIN's 16.2. On price, update cadence, ads and in-app purchases 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.
LightFi Air ships an update every 3 months, HiiTRAIN every 2 months. The most recent releases landed on September 29, 2026 and October 28, 2026 respectively.
| Parameter | LightFi Air | HiiTRAIN |
|---|---|---|
| Price | Free | Free |
| Positive reviews | 100.0% of reviews | — |
| Update frequency | Every 3 months | Every 2 months — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | — |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 12.4 — better | 16.2 |
| Further details — not scored | ||
| Size | 17 MB | 78 MB |
| Age rating | 4+ | 4+ |
| Developer | LightFi Limited | Hii Gym Limited |
In-app purchases
LightFi Air
No in-app purchases
HiiTRAIN
No in-app purchases
