YFF Teacher vs DevicesTool
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
YFF Teacher
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YFF‑timer is a fast, simple time logger for school practice: • Start/stop with optional comment • Totals for selected period (today / this week / this month / all / custom) • Shows hours & minutes, plus number of school periods (45 min, rounded up) • Goal/timebank: set a target in hours and see what remains • Edit or add entries manually • Export CSV or a PDF report with signature fields
DevicesTool
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Devices.Tool Have the following functions * Configure or query LB NB devices * Upgrade the LB NB device
Screenshots
Verdict
The clearest difference is update cadence: YFF Teacher at every 2 days against DevicesTool's every 2 months. On price, ads, 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.
YFF Teacher ships an update every 2 days, DevicesTool every 2 months. The most recent releases landed on October 1, 2026 and October 9, 2026 respectively.
| Parameter | YFF Teacher | DevicesTool |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 days — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad |
| Requires iOS | 18.5 | 17.6 — better |
| Further details — not scored | ||
| Size | 3 MB | 25 MB |
| Age rating | 4+ | 12+ |
| Developer | Thomas Riis | Shenzhen Dragino technology development co.LTD |
In-app purchases
YFF Teacher
No in-app purchases
DevicesTool
No in-app purchases
