Guide
Deadbolts
Smart Locks
Deadbolt vs Smart Lock: A Real Security Test
Most comparisons put features in two columns and stop. This one works through what each design actually resists, where each one fails, what happens when the power or the company goes away — and the component that beats both of them and costs eight dollars.
By Johnny T.
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March 2026
·
13 min read
Some links on this page are affiliate links — we may earn a commission.
Researched — not tested
An earlier version of this page said we picked and kicked these locks ourselves. We did not, and that framing has been removed. Corrected What follows is built from certification records, published security research, manufacturer specification and locksmith consensus — tagged throughout — which is a weaker claim than the one we made and a true one.
A good mechanical deadbolt is physically stronger than most smart locks. A smart lock is better at actually being locked. Those are different problems and most people only have one of them.
If you already lock your door every time, buy the better mechanical lock — it is cheaper, tougher and it does not have a company attached. If the honest answer is that the deadbolt is often not thrown, a smart lock that auto-locks solves a real vulnerability that no amount of hardened steel addresses.
How to read this page
This page compares design categories rather than individual units. Where a specific lock is named, the claim is sourced to that lock’s certification or to its own review on this site.
TestedPhysically in hand. Nothing on this page carries this tag.
DocumentedPublished specification, standard, regulatory filing or security research.
ManufacturerThe maker’s own claim. A claim, not a fact.
CommunityOwner reports and locksmith consensus. Informed opinion.
CorrectedSomething we previously published that the record doesn’t support.
The short version
Buy hardened steel if your problem is force. Buy automation if your problem is memory. Then spend eight dollars on the strike plate, because that beats both.
Three representative products, chosen because a normal person might actually buy them.
That third row is the one people miss. A retrofit does not have a security rating because it does not replace any part of the lock a rating would test. Put one on a good deadbolt and you have a good deadbolt with automation. Put one on a builder-grade deadbolt and you have a builder-grade deadbolt with automation, and a receipt.
Mechanical cylinders vary enormously. The B60N uses a five-pin cylinder with security pins that produce false sets, which frustrates a beginner and slows an experienced picker. A builder-grade cylinder with no security pins opens to a rake in seconds. That is a real spread, and it is why cylinder quality is worth paying for.
Smart locks split three ways on this:
- Keyed models inherit whatever cylinder the manufacturer fitted, which at Grade 2 is generally ordinary.
- Keyless models — the Yale in its key-free configuration — have no keyway at all. There is nothing to pick, rake or bump. That is not a marketing claim, it is arithmetic.
- Retrofits change nothing. The cylinder is whatever was already there.
The honest caveat about picking
Residential burglary is overwhelmingly forced rather than covert. Picking is a rounding error in the crime statistics, and a keyless lock that eliminates it has removed the attack you were least likely to face.
It has also introduced a new one. A code can be shoulder-surfed, shared instantly and infinitely, and left on a sticky note — and unlike a physical key, you never see that it has been copied.
This is the comparison that decides real outcomes, and the answer is uncomfortable for both columns.
It is not the lock. A kicked door fails at the jamb. The bolt does not shear and the cylinder does not matter, because the wood the strike plate is screwed into splits first — and on a standard installation those screws are three-quarters of an inch long and biting into trim, not structure.
What resists a kick is three things working together: bolt throw, a strike plate anchored into the framing rather than the casing, and screws long enough to cross the shim gap into the king stud. Certification measures the first. You are responsible for the other two.
The comparison that should end the argument
A Grade 3 deadbolt with three-inch screws into the stud beats a Grade 1 deadbolt with the factory screws in trim. Every time, for eight dollars, on any lock on this page.
Grade 1 means the lock survived ten blows from a 75 foot-pound ram; Grade 2 five, Grade 3 two. Documented All three numbers assume the strike is properly mounted. Fitted badly, none of them apply. The full job is here and it takes twenty minutes.
On this axis a mechanical Grade 1 lock does beat a Grade 2 smart lock — ten ram blows against five is a genuine difference. It is just a smaller difference than the one between a reinforced frame and an unreinforced one.
This is where the two designs diverge most sharply, and it rarely appears in comparisons at all.
A mechanical deadbolt fails mechanically and locally. It seizes, the cylinder wears, a key snaps. Every one of those is fixable by a locksmith with no reference to any company’s continued existence. A Schlage from 1998 still works. Nobody has to keep a server running for it.
A smart lock has failure modes a deadbolt does not have at all:
- Flat batteries. The most common failure by a wide margin. Keyed models fall back to a key; keyless models fall back to holding a 9V cell against exterior terminals, which works and which nobody rehearses.
- Network and cloud. Remote access, guest codes and logs all run through a service. Local control usually survives; remote control does not.
- The company. This is the one worth sitting with. In June 2023 the August and Yale residential smart lock businesses in the United States and Canada were divested to Fortune Brands as an antitrust condition of ASSA ABLOY acquiring Kwikset. Documented Two of the biggest names in this category changed owners by regulatory compulsion, and the app you depend on went with them.
Retrofits handle this best, and it is their strongest structural argument: because the exterior cylinder is untouched, your original key opens the door regardless of batteries, network or vendor. A full-replacement smart lock with no keyway has no such fallback.
A good mechanical deadbolt is a one-off purchase in the range of a few tens of dollars and then nothing, effectively forever.
A smart lock is the hardware, plus batteries several times a year, plus in many cases a connectivity module sold separately, plus the standing possibility that the service behind it changes hands or changes terms. None of those are large individually. Together they are the difference between buying a lock and subscribing to one.
The factor nobody prices is behaviour. A deadbolt that gets thrown every single time is worth more than a better one that gets thrown most of the time, and auto-lock is the only feature on this page that changes whether the door is actually locked. If your honest audit is that the deadbolt is sometimes not engaged — groceries, kids, a quick trip to the bin — that is a genuine vulnerability, and hardened steel does not address it.
Are smart locks less secure than regular deadbolts?
Physically, most are one grade lower: the connected category has broadly settled at Grade 2 while good mechanical deadbolts reach Grade 1. Functionally, a smart lock is better at being locked, because auto-lock removes human forgetfulness. Which matters more depends on whether your problem is force or memory.
What actually stops someone kicking my door in?
Not the lock. A kicked door fails at the jamb because the strike plate screws only reach the trim. A reinforced strike plate and three-inch screws that cross the shim gap into the king stud cost about eight dollars and do more than any lock upgrade on this page.
Can a keyless smart lock be picked?
No. With no keyway there is nothing to pick, rake or bump, which removes an entire attack class. It also removes your mechanical fallback, so the failure to plan for is a flat battery rather than a burglar with picks. Codes bring their own exposure, because they can be watched and shared without leaving a trace.
What happens to my smart lock if the company goes away?
Depends on the design. A retrofit leaves your original cylinder untouched, so your key still works no matter what happens to the vendor. A full-replacement keyless lock has no such fallback beyond emergency power terminals. This is not hypothetical: in June 2023 the August and Yale residential smart lock businesses in North America changed owners as an antitrust condition of a separate acquisition.
Should I use both a deadbolt and a smart lock?
That is the strongest setup, and it is what a retrofit gives you. A well-certified mechanical deadbolt provides the physical resistance and a retrofit smart lock provides automation on top of it, without weakening the bolt. Fit the strike reinforcement at the same time.
The Comparison, Condensed
Physically strongest
A Grade 1 mechanical deadbolt — ten ram blows
Most reliably locked
Any smart lock with auto-lock engaged
No keyway to attack
Keyless smart locks only
Best failure behaviour
Retrofit smart lock — original key always works
Worst failure behaviour
Keyless full-replacement — no mechanical fallback
Cheapest over ten years
Mechanical deadbolt, by a wide margin
Depends on a company
Every smart lock. No mechanical lock
Beats all of the above
A reinforced strike plate and three-inch screws, about $8 Documented
Nobody wins this comparison in the abstract, which is why every article that tries to declare a winner ends up recommending whichever product it has an affiliate link for.
Buy the mechanical deadbolt if you reliably lock your door, if you want the strongest physical hardware for the least money, and if you would rather own a thing than depend on a service. It is Grade 1 for a fraction of the price of anything connected.
Buy the retrofit if your existing deadbolt is already good and what you want is automation on top of it. It is the only option that adds smart features without removing your mechanical fallback.
Buy the full-replacement smart lock if the lock on your door is genuinely poor, because then you are replacing a weak component rather than automating a strong one.
And then, regardless of which column you chose: reinforce the frame. Every lock discussed on this page fails at the jamb before it fails at the cylinder, and the fix costs less than a set of batteries.
The short answer
Hardened steel for force, automation for forgetfulness, and eight dollars of screws for the thing that actually breaks first.
Sources & Method
- Testing claims removed — Corrected An earlier version of this page stated that we picked and kicked these locks ourselves. We do not own them. Those passages, and the results attributed to them, have been removed and replaced with certification records, published research and sourced consensus.
- Grade test values — Documented Grade 1 hardware must survive ten blows from a 75 foot-pound impact ram and remain functional, Grade 2 five, Grade 3 two. Grade 1 is the commercial A156.36 scale; A156.40 is the residential standard whose top mark is AAA. NoPryZone — ANSI grades explained
- Retrofit locks carry no grade — Documented A retrofit smart lock replaces only the interior thumb turn and therefore has no certification of its own, inheriting whatever deadbolt it is fitted over. NoPryZone — August review
- Ownership change — Documented The August and Yale residential and multifamily smart lock businesses in the United States and Canada were divested to Fortune Brands on 20 June 2023 as a condition of the Department of Justice settlement permitting ASSA ABLOY’s acquisition of Spectrum Brands’ hardware division. ASSA ABLOY — completion announcement
We do not own these locks and nothing here is hands-on. If you have had a door forced with either type fitted, that outcome is worth more than any specification above — tell us what happened and you will be credited.
