Upkey 2 vs Trueline
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Upkey 2
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Esta versión renovada de la aplicación permite a los hoteles integrar dispositivos BLE manteniendo los niveles de seguridad establecidos. El sistema admite tres perfiles de usuario diferenciados, lo que facilita su adaptación a las operaciones del establecimiento sin comprometer el control ni la trazabilidad. De forma predeterminada, las llaves electrónicas se generan y distribuyen desde el software de recepción. Para casos puntuales o situaciones de emergencia, el administrador de la instalación puede crear y enviar llaves de apertura vía Bluetooth desde su smartphone. Tras la ejecución de una auditoría, los registros se sincronizan automáticamente con el servidor y quedan disponibles tanto en el software de gestión como en la aplicación para los usuarios con perfil administrador.
Trueline
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Trueline turns your iPhone into a level that behaves like a real instrument — quiet, readable, and honest about what it measures. Free: • Auto-switching modes — on edge or plumb you get a vial with a signed degree readout; laid flat it becomes a 2-axis bullseye surface level • Read in degrees, slope %, or roof pitch (rise per 12) • One-tap calibration • HOLD freezes a reading you can't see from where you're standing • ZERO for relative angles — the angle between two surfaces • Haptic snap and a green edge glow the moment you're level • Fully offline, no account Pro — one payment of $6.99, no subscription: • AR laser level: project gravity-true level and plumb lines onto the wall and hang a whole row of frames in one pass • Named angle presets — 4/12 and 6/12 roof pitch, stair rake, 2% drainage • Precision tolerance down to ±0.1° • 5 instrument themes • No ads Pay once, yours forever. No subscription, no sign-in, and nothing leaves your phone.
Screenshots
Verdict
The clearest difference is in-app purchases: Upkey 2 at none against Trueline's 1. Upkey 2 also leads on ads (none vs shown) and iOS requirement (15 vs 17.0). Trueline's advantage is update cadence (daily vs every 2 weeks). On price 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. Trueline sells 1 one-off in-app purchase. Upkey 2 asks for nothing beyond the download.
Upkey 2 ships an update every 2 weeks, Trueline daily. The most recent releases landed on October 23, 2026 and October 3, 2026 respectively.
| Parameter | Upkey 2 | Trueline |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 weeks | Daily — better |
| Ads | No — better | Yes |
| In-app purchases | No — better | Yes |
| Devices | iPhone, iPod — better | iPhone |
| Requires iOS | 15 — better | 17.0 |
| Further details — not scored | ||
| Size | 75 MB | 12 MB |
| Age rating | 4+ | 4+ |
| Developer | Omnitec Systems, S.L. | Edge Analytics s.r.o. |
In-app purchases
Upkey 2
No in-app purchases
Trueline
- Trueline Pro$6.99









