Three years ago a page called "best smart locks under $150" would have been a page about compromises. It is not any more, and the reason is specific rather than general: the two features that used to define a premium lock - a fingerprint reader and Wi-Fi built into the lock itself rather than sold separately as a bridge - have both arrived at the bottom of the market. What has not changed is that a lock is the one smart home device where the body matters more than the software, and that is where the $150 ceiling still bites. This page is about which compromises are still real and which ones you no longer have to make.
The rule we used: under $150 on the live listing, today
Every lock here was under $150 on its live Amazon listing on 2026-11-10, in stock and buyable. We never type a price into a page - the number on each buy button is pulled from Amazon and timestamped, so if a lock creeps over the ceiling the page shows you that before we notice it, and if there is no buyable offer the button tells you to check rather than quoting a figure we cannot stand behind.
That ceiling is doing real work. It excluded the Kwikset Halo, the Yale Assure Lock 2 and the SwitchBot Lock Ultra, all of which sat between roughly $175 and $200 when we checked, and it excluded the Level Lock+ and Schlage Encode Plus by a wide margin. If your budget has a little more room, best budget smart locks is our value ranking up to about $200, and best smart locks is the whole field with no price limit at all.
One deliberate exclusion: padlocks. Several smart padlocks sit under $150 and some are excellent, but a padlock secures a gate, a shed or a locker rather than a front door, and mixing the two product classes on one page helps nobody. Best smart padlocks ranks those separately.
List price or promotion? Which is which, here
A price ceiling page has one failure mode worth stating plainly: a product that only clears the ceiling because it happens to be deeply discounted this week. Three of the four picks here were under $150 on their normal listing price when we checked - the ULTRALOQ Bolt, the August and the Aqara U100 - so the ceiling is not propped up by a sale.
The eufy C220 is the exception. Its listing showed a deep seasonal reduction on the day we checked, and at its list price it sits above $150 rather than under it. We have kept it as the budget pick because it is genuinely the cheapest route we know to fingerprint entry plus hub-free Wi-Fi, and because the live price on its button will always tell you the truth - but if the number you see there is above $150, the promotion has ended and the ULTRALOQ Bolt is the better lock at that money anyway. Worth knowing before you decide whether to buy now or wait: what actually discounts in this category.
Security grade is the spec the price ceiling actually cuts
If you read one section of this page, read this one. Residential deadbolts are graded by ANSI/BHMA, and the grade is a third-party standard tested against rather than a marketing adjective: Grade 1 is the highest residential rating, Grade 2 sits below it and Grade 3 is the entry level. The tests cover things you cannot see on a listing photograph - how many cycles the bolt survives, how much force the assembly takes, how it behaves under attack.
Under $150 the normal answer is Grade 3, and that is what makes the ULTRALOQ Bolt's published Grade 1 the most interesting number on this page. The eufy C220 publishes Grade 3, which is honest and certified and perfectly adequate behind a decent door in a low-risk location. The Aqara U100 is the interesting case: Aqara claims compliance with the same standard rather than a certification to it, which is a different kind of claim, and we are not going to blur them. The August has no grade at all, for a structural reason rather than a corner cut - it does not replace your bolt, so there is nothing of its own to grade. It inherits whatever your existing deadbolt is, which is either very good news or very bad news depending on what you already own.
That is the one place the $150 ceiling genuinely costs you, and it is worth knowing that most burglaries do not defeat the lock anyway - they defeat the frame, the strike plate or a window. A Grade 3 lock on a reinforced strike plate is a stronger door than a Grade 1 lock on two short screws into soft pine. Are smart locks safe covers that picture properly, and how to install a smart lock has the strike-plate upgrade that costs almost nothing and does more than a grade bump.
Built-in Wi-Fi, or a bridge you did not budget for
This is the hidden cost that decides whether a lock is actually under $150. A smart lock needs a radio to talk to your phone when you are not standing next to it, and there are two ways to get one: the lock has Wi-Fi inside it, or it speaks Bluetooth and relies on a separately sold bridge or hub to reach the internet. The listing price only tells you about the first case.
Three picks here have Wi-Fi built in - the ULTRALOQ, the August and the eufy C220 - so remote lock, remote unlock, away-from-home alerts and an activity log all work the moment the lock is on the door, with nothing else bought. One does not: the Aqara U100is Bluetooth locally and needs an Aqara hub for any of that, which means its real delivered cost sits above this page's ceiling even though the lock itself does not. We rank it third anyway, because it is the only Apple Home Key lock under $150 and for an Apple household that is worth the hub - but you should know you are buying two things.
Worth saying plainly: Bluetooth-only is not a defect. A lock that never touches the internet has a smaller attack surface and a longer battery life, and if you only ever unlock the door while standing in front of it, you may not want Wi-Fi at all. Bluetooth vs Wi-Fi smart locks is the full comparison, and do smart locks need a hub answers the question this section raises for every brand.
Retrofit or replacement changes who can still get in
The August is a retrofit: it mounts on the inside of the deadbolt you already have and turns your existing thumbturn with a motor. The other three are replacements. For most buyers this reads as an installation detail, and it is not - it is a decision about keys.
A retrofit means every key already in circulation keeps working. That is the right answer, and sometimes the only answer, when a landlord holds a key, when a neighbor waters the plants, when a parent has one for emergencies, or when you rent and are not allowed to change the hardware at all. A replacement deadbolt retires all of those keys the moment it goes on the door, so budget for the conversation as well as for cutting new ones.
The flip side is that a retrofit inherits your bolt's mechanical quality and gives you no security grade of its own, and it needs clearance around the inside of the door for a chunkier body. Will a smart lock fit my door has the five measurements to take first, and best smart locks for renters is the page to read if the door is not yours.
Credentials: what gets you in when the phone does not
The single best predictor of whether someone likes their smart lock a year later is how many ways into the house do not involve a phone. Under $150 you do not have to compromise here, which is the real change in this bracket.
Fingerprint is the most robust credential there is, because it cannot be forgotten, lost or left in a coat pocket, and it is the only one that works for a household member without a smartphone. Three of the four picks have it - the ULTRALOQ, the Aqara and the eufy - and only the August does not. Keypad codesare the right credential for guests, cleaners and trades, because a code can be named, scheduled and deleted; all four picks offer one, with the August's Keypad Touch included in the box. Apple Home Key is the fastest deliberate method of all - a tap of an iPhone or Apple Watch, no app, about a second - and under this ceiling only the Aqara U100 has it.
The one combination to avoid is a lock whose only non-phone fallback is a physical key you do not carry, which is how people end up standing on a porch at 11pm. Keypad vs fingerprint smart locks covers how each one fails - cold fingers, wet hands, worn keypads - and how to share smart lock access with guests is the practical side of running codes for other people.
Weather, batteries and the running cost nobody prices in
Two numbers decide how a cheap lock ages, and neither of them is on the front of the box.
The first is the exterior rating. IP65, which the ULTRALOQ and the Aqara publish, means protection against dust and against water jets - a lock you can mount on a fully exposed door. IP53, which eufy publishes for the C220, is splash protection: fine under a porch or an overhang, a real risk on a west-facing door that takes driven rain. The August sits outside this comparison because its electronics live inside the house.
The second is batteries. The eufy ships eight AA cells and publishes roughly eight months at ten unlocks a day; ULTRALOQ publishes up to ten months for the Bolt. Those figures assume usage patterns the makers do not fully state, so treat them as the shape of the answer rather than a promise - and note that eight AA cells twice a year is a running cost on a lock that was cheap to buy. What actually extends battery life on any of these is a bolt that slides freely rather than fighting a misaligned strike plate, because a motor straining against a sticky bolt is the single biggest avoidable drain. Smart lock battery life goes through what each design draws, and do smart locks work without power covers the dead-battery scenario - including the eufy's emergency power port, which is a genuinely useful inclusion at this price.
How we ranked these
In this order. First the ceiling: under $150 on the live listing, in stock, on 2026-11-10 - nothing else gets on the page. Second, what the maker publishes about the body, with a third-party security certification beating a claim of equivalence and both beating silence. Third, whether remote access works without buying a bridge, because a hub turns a $150 lock into a $200 purchase. Fourth, how many ways into the house do not need a phone. Fifth, the exterior rating and the published battery life, which decide how the lock ages. Sixth, whose keys stop working the day you fit it.
We do not score these locks and we have not fitted all four to a test door, because we do not run a lock lab. Every specification here is the manufacturer's or seller's own published claim, read on the date in the sources below, and every price is pulled live from the listing. If you would rather start from the decision than from a price bracket, how to choose a smart lock is the page that does that, and how much does a smart lock cost explains what the brackets above and below this one actually buy.
