Comparison

Supra eKEY vs SerialCheck

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Supra eKEY

This app provides real estate professionals with secure and efficient access to properties. It allows for easy opening of keyboxes, customization of access, and access to valuable property information to enhance client service.

Highlights
  • Open keyboxes with PIN or biometrics
  • Manage keybox settings and access hours
  • Track keyboxes and view showing notifications
  • Access MLS listing information offline
  • Create and manage buyer profiles
  • View property notes and agent contact info
Features
Read full description

Use your phone as your lockbox key! The Supra eKEY app allows real estate professionals efficient, authorized access to listings. Open lockboxes easily using a PIN, biometrics. The eKEY app is part of the original Supra system and works alongside the SupraWEB tool. Use this app if your Association/MLS has not yet upgraded to Supra One. Are you looking for lockbox access with Supra Showings or Showing Management powered by BrokerBay? Search for Supra One in the App Store. The Supra eKEY app allows real estate professionals efficient, authorized access to properties for sale. Open lockboxes easily using a PIN, the phone’s biometric feature or the Apple Watch. The app also provides access to powerful information that opens the doors to a higher level of service for your clients. eKEY Basic Service provides the following features: •  Obtain listing keys •  Easily place lockboxes on properties •  Keep track of lockboxes •  View or change lockbox settings •  Customize lockbox access hours, agent note, flyer, business card in lockbox •  Sending showing notifications when showing starts and ends •  Viewing showing details in app •  View data at the door real-time property notes eKEY Professional Service provides all of the features in eKEY Basic plus: •  Create data at the door real-time property notes •  View MLS listing information even while offline •  View agent roster contact information •  Create and save buyer profiles •  View hotsheet listings •  View map and directions to listings at the tap of a button •  Create and view list of buyers •  Invite buyers to use the Supra Home Tour app for rating homes •  Recommend listings for buyers to view and rate in Supra Home Tour app •  View and compare buyer home ratings •  View buyer feedback on properties and compare by buyer or listing The Supra eKEY app is designed for real estate professionals who belong to an association or MLS using the Supra system. Contact your association or MLS to subscribe to eKEY service or to upgrade from eKEY Basic to eKEY Professional. Search terms: Supra, supra key, supra ekey, lockbox access, supra real estate

About

SerialCheck

Features
Read full description

SerialCheck: HVAC & Water Heater Age + Model Decoder SerialCheck is a streamlined, offline-first tool designed for residential home inspectors, property managers, and service professionals. Quickly determine the age of furnaces, water heaters, and outdoor AC units by decoding manufacturer serial numbers, and extract useful model-number details where supported. Built specifically to replace unreliable web-based lookup resources, SerialCheck works in basements, crawl spaces, attics, and mechanical rooms where cell signals fail. No account required, no ads, and no report-writing clutter — just fast field information you can copy into your inspection report. KEY FEATURES: FAST AGE DECODING Translate complex manufacturer serial numbers into manufacture dates. MODEL NUMBER SPECS For supported brands, decode useful model-number details such as equipment type, nominal capacity, efficiency class, product tier, voltage, refrigerant, fuel type, water heater capacity, and tankless/tank format. 100% OFFLINE DECODING Core decoding data is stored locally on your device. No internet connection is required for normal decoding. GUIDED ENTRY Select the appliance type, choose the brand, and enter the model and serial information. COPY & SHARE Copy decoded results for easy use in inspection reports, service notes, and property records. PRIVACY-MINDED No required login, no ads, and no selling user data. SUPPORTED APPLIANCES & COVERAGE: WATER HEATERS Age decoding for major water heater brands including Rheem, Bradford White, AO Smith, Richmond, State, Kenmore, Whirlpool, American Water Heater, Reliance, Ruud, Mainstream, Navien, Rinnai, and many others. Water heater model-number Find Specs is available for supported brands such as Bradford White and Rheem. FURNACES Age decoding for major furnace brands including Carrier, Bryant, Payne, Lennox, Armstrong, Goodman, Amana, Trane, American Standard, York, Coleman, Heil, Tempstar, and more. OUTDOOR AC UNITS & HEAT PUMPS Age decoding for major outdoor HVAC brands including Goodman, Lennox, Rheem, Trane, Carrier, York, Bryant, Ruud, American Standard, and other major manufacturers. Outdoor HVAC model-number Find Specs is available for supported brands including Carrier, Goodman, Lennox, and Trane. IDEAL FOR: HOME INSPECTORS Get manufacture dates and useful equipment details for professional reports. PROPERTY MANAGERS Track appliance and HVAC equipment age across a portfolio. SERVICE PROFESSIONALS Identify unit age and basic equipment specs to support repair-or-replace conversations. Stop relying on slow, outdated websites. SerialCheck gives you fast, field-ready appliance and HVAC decoding so you can get the information you need and move on. NOTES: SerialCheck focuses on manufacturer serial-number age decoding and selected model-number specification decoding. Supported model-number details vary by brand and appliance type. Results should be verified against the equipment rating plate when needed. Bosch and Nortek-family products are currently not supported. PRIVACY SerialCheck does not require an account, contains no ads, and does not sell user data. We collect limited operational data such as device type, OS version, app version, and coarse location derived from your public IP address. This helps us understand device usage, active app versions, general app performance, and detect abuse or misuse of our systems. This data is retained for up to 90 days on servers we control. If you contact support, you may provide your name and email address so we can reply. Support emails are not used for tracking and are deleted when no longer needed, or within 2 years. SAFETY We use limited operational data to detect abuse, scraping, misuse, and other activity that could interfere with the app or our systems.

Screenshots

Supra eKEY4 screens
SerialCheck4 screens

Verdict

The call

The clearest difference is in-app purchases: Supra eKEY at none against SerialCheck's 3. Supra eKEY also leads on iOS requirement (12.0 vs 15.6). SerialCheck's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. SerialCheck sells 3 in-app purchases, starting at $0.99 per month. Supra eKEY asks for nothing beyond the download.

UpkeepUpdate frequency

Supra eKEY ships an update every 2 months, SerialCheck every 3 weeks. The most recent releases landed on November 6, 2026 and October 28, 2026 respectively.

Scorecard3 real differences · 7 level
Supra eKEY versus SerialCheck: the parameters behind the verdict, then further details
ParameterSupra eKEYSerialCheck
PriceFreeFree
Rating2.3 (969 ratings) — better—
Positive reviews12.9% of reviews—
Number of ratings969 — better—
Update frequencyEvery 2 monthsEvery 3 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationSubscription—
DevicesiPhone, iPod, Apple WatchiPhone, iPad, iPod, Mac — better
Requires iOS12.0 — better15.6
Further details — not scored
Size47 MB35 MB
Age rating4+17+
DeveloperSupraNanoHawk

Bugs and requests

Supra eKEY

Reported bugs

4 issues
  • App freezes and crashes on latest iPhone models
  • Bluetooth connectivity issues preventing access to lockboxes
  • Payment screen glitches and inability to update billing info
  • Inconsistent performance across different devices and OS versions

Requested features

4 requests
  • Automatic updates without user intervention
  • Offline functionality for areas with no cell service
  • Apple Watch complications support
  • Improved UI and UX for programming lockboxes

SerialCheck

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Supra eKEY

No in-app purchases

3 purchases

SerialCheck

Subscriptions2
  • SerialCheck Pro Monthly$0.991 Month
  • SerialCheck Pro Annual$3.991 Year
One-time1
  • SerialCheck Pro Lifetime$19.99

Questions

Is Supra eKEY free?
Supra eKEY is free to download, with no in-app purchases.
Is SerialCheck free?
SerialCheck is free to download, with in-app purchases available.
Do Supra eKEY or SerialCheck have ads?
Neither Supra eKEY nor SerialCheck shows ads.
Which is updated more often, Supra eKEY or SerialCheck?
Supra eKEY ships an update every 2 months, and SerialCheck every 3 weeks. Most recently, Supra eKEY was updated on November 6, 2026 and SerialCheck on October 28, 2026.

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