Open iBox BT LE lockboxes with your smartphone via Bluetooth -- no physical key fobs required.
S
Supra eKEY
suprasystems.comSupra eKEY is the most widely deployed electronic lockbox system in real estate, now owned by Honeywell, providing secure property access with comprehensive showing activity tracking.
The verdict
Supra eKEY remains the most widely deployed lockbox system, but agents in SentriLock markets now get a better overall deal: SentriLock includes free showing management while Supra charges $15-21/month for eKEY alone without any built-in showing scheduling. Supra is the default where it is the MLS standard, but it is no longer the best value.
01 — Overview
What Supra eKEY is, and isn't.
Supra eKEY (now owned by Honeywell International following its $4.95 billion acquisition of Carrier Global's Access Solutions business in June 2024) is the most widely deployed electronic lockbox system in North American real estate. The system consists of Bluetooth-enabled iBox BT LE lockboxes installed at properties and the eKEY mobile app that authorized agents use to open them.
For listing agents, Supra provides security and accountability: every lockbox access is logged with agent identity, date, time, and duration. Listing agents can set access schedules, receive notifications when their lockboxes are opened, and restrict access to specific time windows. For buyers' agents, eKEY provides convenient smartphone-based access without physical key fobs. Integration with ShowingTime allows lockbox access to be granted only during confirmed appointments.
Unlike SentriLock (where app access is often included in association dues), many MLSs charge a separate monthly eKEY subscription fee of $15-21/month -- a significant ongoing cost. Lockbox purchase prices range from $135-145 for new iBox BT LE units, with used boxes available around $96. The Honeywell acquisition may bring enterprise-level resources and product development to the platform, though the practical impact on agent-facing features remains to be seen.
02 — Features ◆ standout
10 features, scored.
The 5 marked ◆ are why we rate Supra eKEY a 4.3 overall.
Every lockbox opening is logged with agent identity, date, time, and duration for full accountability.
Listing agents receive instant alerts when their lockboxes are accessed, with full agent details.
Set showing windows and restrict access to specific hours or date ranges for seller convenience.
Works with ShowingTime to grant lockbox access only during confirmed showing appointments.
If an agent's device is lost or compromised, access can be remotely revoked immediately.
Secure shackle mechanism that releases only with authorized access credentials.
App shows lockbox battery levels; long-life batteries last months between changes.
Web-based portal for managing lockbox inventory, access reports, and account settings.
Agent credentials verified through MLS membership status before granting lockbox access.
03 — Verdict at a glance
What we like — and where it falls short.
Pros
- +Largest market share of any lockbox system -- most agents already have eKEY access
- +Comprehensive access tracking provides security and showing verification for sellers
- +Bluetooth smartphone access eliminates the need for separate physical key fobs
- +Tight ShowingTime integration for appointment-synced access control
- +Honeywell acquisition (June 2024) brings enterprise resources for future development
Cons
- −Monthly eKEY subscription ($15-21/mo) is an ongoing cost that SentriLock avoids
- −Lockbox purchase costs ($135-145 new) add up for agents with many listings
- −No built-in showing management platform -- requires separate ShowingTime subscription
- −Pricing and availability controlled by MLS, limiting agent choice
04 — Pricing
3 tiers. Most teams land on the middle one.
Prices below are as listed publicly Feb 2026. Verify on the official pricing page before committing — vendor pages change more often than our quarterly re-checks.
eKEY Basic
$15 / mo
$0/mo billed annually
- Supra eKEY mobile app access
- Open Supra iBox BT LE lockboxes via Bluetooth
- Access activity tracking and logs
- Listing agent notifications on access
- Pricing varies by MLS ($15-21/month typical)
eKEY Pro Most pick this
$29 / mo
$0/mo billed annually
- All eKEY Basic features
- Enhanced access controls and reporting
- Additional management tools
- Arizona pricing example: $28.69/mo + tax
- Availability varies by MLS
Lockbox Purchase
Custom
- New iBox BT LE lockbox: $135-145 each
- Used iBox BT LE lockbox: ~$96 each
- Lockbox rental: $5-8/month where available
- One-time activation fee: $50 (required for new accounts)
- Purchase typically through MLS or Supra directly
05 — Integrations
What it talks to, out of the box.
Direct integrations marked first; Zapier and Make cover the long tail.
ShowingTime
Most major MLSs
Supra SupraWEB
Public API: yes
06 — Top alternative
If Supra eKEY isn't the right shape.
S
SentriLock
SentriLock has transformed from a lockbox-only system into a genuine ShowingTime competitor by offering free showing management to all lockbox customers. In markets where SentriLock is the standard, agents now get lockbox access plus showing scheduling at no extra cost -- a compelling value proposition that Supra does not match.
07 — Frequently asked
Questions every Supra eKEY shopper asks.
How much does Supra eKEY cost per month?
Unlike SentriLock where app access is often included in association dues, most MLSs charge a separate eKEY subscription of $15-21/month. Some markets have Pro tiers at $28-29/month. New accounts also require a one-time $50 activation fee.
Who owns Supra eKEY now?
Honeywell International acquired Supra from Carrier Global in June 2024 as part of a $4.95 billion deal for Carrier's Global Access Solutions business. Supra is now part of Honeywell's Building Automation division alongside LenelS2 and Onity.
How much do Supra lockboxes cost?
New iBox BT LE lockboxes cost $135-145 depending on your MLS market. Used lockboxes are available around $96. Rental options ($5-8/month per box) are offered by some MLSs. Pricing is set by individual MLS partnerships.
Does Supra work with ShowingTime?
Yes. Supra integrates tightly with ShowingTime so lockbox access can be granted only during confirmed showing appointments. This adds security by ensuring agents can only access properties during their scheduled showing windows.
What is the difference between Supra and SentriLock?
Both are electronic lockbox systems with similar core functionality. Supra (Honeywell) has larger overall market share. SentriLock (NAR-owned) now includes a free showing management platform for all lockbox customers, while Supra charges a monthly eKEY fee and has no built-in showing management. Your MLS determines which system is available.
What if my phone dies during a showing?
You need a working smartphone to open the lockbox. The eKEY app works offline after initial authorization, but you still need phone power. Many agents carry portable battery packs as backup. If your device is lost, access can be remotely revoked.