Software That Sends Smart Lock Codes to Guests Automatically (2026)
Last reviewed: October 2026
Smart lock software creates a door code for each booking, sends it to the guest before arrival and removes it after checkout. The same system should give cleaners and vendors their own codes, so nobody shares the owner's code. Rentology creates guest codes on supported smart locks for every booking, writes them back to OwnerRez so your check-in message carries the right code, and gives cleaners and vendors their own access. It also works when the lock vendor sets the code, as on bridge-less keyboxes. RemoteLock and the lock makers' own apps also manage codes, but they do not run the rest of the rental.
What smart lock code software has to do
- A new code for every booking, active only from check-in to checkout
- The code reaches the guest automatically in the check-in message
- Separate codes for cleaners and vendors, removed when the job ends
- Works with the locks you already own
- An alert when a lock goes offline or its battery runs low
The options, compared
| Product | Built for | Door codes |
|---|---|---|
| Rentology | Short-term, mid-term and long-term rentals in one account | Guest codes per booking on supported smart locks, written back to OwnerRez, plus cleaner and vendor access and offline alerts |
| RemoteLock | Access control for rentals and buildings | Dedicated code management across many lock brands |
| Lock maker apps | One brand of lock each (for example Schlage, Yale or igloohome) | Create codes by hand or by schedule for that brand only |
| Hostaway | Short-term rental channel management and operations | Connects to smart lock partners through integrations |
1. Rentology
Short-term, mid-term and long-term rentals in one account. Guest codes per booking on supported smart locks, written back to OwnerRez, plus cleaner and vendor access and offline alerts.
Best for: Managers who want door codes inside the same system as bookings, cleaning and owners.
2. RemoteLock
Access control for rentals and buildings. Dedicated code management across many lock brands.
Best for: Operators who want a separate access-control system.
3. Lock maker apps
One brand of lock each (for example Schlage, Yale or igloohome). Create codes by hand or by schedule for that brand only.
Best for: A few homes with one lock brand.
4. Hostaway
Short-term rental channel management and operations. Connects to smart lock partners through integrations.
Best for: Managers already running bookings in Hostaway.
How Rentology handles door codes
- A guest code for every booking on supported smart locks, valid from check-in to checkout
- With OwnerRez, codes are written back so the check-in message carries the right code
- Cleaners and on-site staff get their own codes through one secure link, which you can revoke and audit
- Contractors get a vendor code, never the owner's or the lockbox code
- An alert when a lock goes offline, and the device health in one list
How it works in Rentology, step by step
- Connect your smart locks and link each one to its home.
- For every booking, a guest code is created that works from check-in to checkout.
- With OwnerRez, the code is written back so your check-in message sends it.
- Give cleaners and on-site staff their own codes through one secure link; contractors get a vendor code.
- If a lock goes offline or its battery runs low, you get an alert.
An example
A weekend booking
A guest books Friday to Sunday. Rentology creates the guest's code on the front door lock, active from Friday's check-in time until Sunday's checkout, and writes it to OwnerRez so the check-in message carries it. The cleaner uses her own code on Sunday afternoon. When the plumber comes on Monday, he gets a vendor code for that job, never the owner's code.
Frequently Asked Questions
How we wrote this
Rentology publishes this page, so read it as our view. We describe each product by what it was built for and say plainly where another tool fits better. Check each vendor's site for current prices and features.
See Rentology for short-term rentals