August Wi‑Fi Smart Lock (4th Gen) Review — 2026

Intro

If you want a modern, compact smart lock that bolts onto your existing deadbolt without rekeying, the August Wi‑Fi Smart Lock (4th Gen) is one of the easiest retrofit options on the market. Aggregating roughly 14,338 reviewer ratings gives this model a 3.9/5 overall score with particularly strong marks for ease of use and design, but consistent complaints about Wi‑Fi reliability and battery life temper the enthusiasm. Our verdict: great for buyers who value fast installation and rich software features, but expect tradeoffs in connectivity and recurring battery maintenance.

What Is the August Wi‑Fi Smart Lock (4th Gen)?

The August Wi‑Fi Smart Lock (4th Gen) is a bolt‑on smart deadbolt adapter designed to let you keep your existing keyed exterior hardware while converting the interior thumbturn into a connected lock. Unlike full deadbolt replacements, it attaches to the inside of the door over your current cylinder, so you don’t need to change keys or rekey locks. Key selling points include built‑in Wi‑Fi for remote access (no separate bridge required), a compact low‑profile form factor, Bluetooth fallback for local control, and a feature set focused on guest keys, schedules, and activity logs.

The lock advertises compatibility with the major smart ecosystems — Apple HomeKit, Amazon Alexa, and Google Assistant — so you can integrate it into voice and automation routines. The August mobile app handles setup, user management, and firmware updates, while settings let you create temporary, recurring, or permanent virtual keys for family, cleaners, and guests.

What Reviewers Across the Internet Say

When we synthesize reviews from large consumer platforms and expert outlets, a clear pattern emerges:

• Amazon: generally positive (around 4/5). Customers praise the straightforward, bolt‑on installation, compact styling, and the convenience of remote access. At the same time, many reviewers call out inconsistent Wi‑Fi behavior and battery‑life headaches.
• Reddit: mixed to negative (≈3.2/5). Reddit threads tend to surface real‑world pain points: setup and firmware hiccups, HomeKit flakiness, and users reporting shorter battery life. Those who stick with it often share troubleshooting steps and network tweaks that improved their experience.
• YouTube: positive (≈4.2/5). Hands‑on video reviews favor the build quality and practical features. Reviewers often note software caveats and emphasize how battery life shifts noticeably when Wi‑Fi is left enabled.
• Expert blogs: positive (≈4.1/5). Outlets like Tom’s Guide, Digital Trends and Tech blogs highlight the product’s smart features and easy installation but call out connectivity and battery tradeoffs as important limitations.

Across these sources, consensus points are consistent: installation and design are strong, app features are robust, and connectivity/battery reliability are the common weak spots.

Performance & Real‑World Use

Installation and setup

• Expect a quick, mostly tool‑free retrofit that takes about 10–20 minutes for most standard deadbolts. Because the August locks clamp to the interior thumbturn, you keep your exterior key and don’t need a locksmith.

Daily reliability

• Locally (Bluetooth) the lock performs reliably for locking/unlocking and manual override. The August app provides activity logs and remote unlock options when Wi‑Fi is working, but many users report intermittent dropouts with HomeKit and cloud connectivity — especially on crowded or weak 2.4 GHz networks and some mesh Wi‑Fi setups.

Battery life

• Battery life is the headline tradeoff: with built‑in Wi‑Fi enabled for constant cloud connectivity and remote access, many users in aggregated reviews report replacing batteries every 3–6 months. If you disable Wi‑Fi and rely primarily on Bluetooth and occasional bridge use, battery life improves noticeably. If long intervals between battery changes are a priority, consider a Bluetooth‑only or hardwired option.

Smart home integrations

• The lock integrates with Alexa, Google Assistant, and HomeKit, but reliability varies by ecosystem and network layout. Voice unlocking and automations generally work, though some users experience delayed status updates or failed automations if the lock temporarily loses cloud connectivity.

Support and firmware

• Firmware updates are necessary for stability and feature fixes; however, app and firmware bugs have been reported and customer support experiences are uneven. Patience and a methodical troubleshooting approach (resetting, readding to HomeKit or the August app, checking 2.4 GHz signal strength) solve many problems, but they’re an extra step some buyers may not want to take.

Security and convenience

• The lock offers the convenience of temporary and scheduled access, plus activity logging that’s very useful for households or short‑term rentals. Because it doesn’t replace the exterior hardware, you retain your keyed backup, which many users like for redundancy.

Pros and Cons

Pros

• Very easy bolt‑on installation that fits most existing deadbolts — no rekeying or locksmith required.
• Sleek, compact design that is less obtrusive than some earlier or bulkier smart‑deadbolt options.
• Robust app features: temporary/recurring guest keys, activity logs, and scheduled access make it useful for families and rentals.
• Built‑in Wi‑Fi removes the need for a separate hub or bridge for remote access.
• Broad smart‑home ecosystem support (Alexa, Google Assistant, HomeKit) and Bluetooth fallback for local control.

Cons

• Shorter‑than‑expected battery life when Wi‑Fi is enabled (many reviewers report changing batteries every 3–6 months).
• Intermittent Wi‑Fi and HomeKit connectivity reported — issues more common on weak 2.4 GHz signals and complex mesh networks.
• App and firmware bugs remain an occasional source of frustration; support experiences are inconsistent.
• Remote access convenience comes at the cost of more frequent battery changes compared with Bluetooth‑only operation.

Who Should Buy It (and Who Shouldn't)

Should buy if:

• You want a noninvasive retrofit: the August is one of the easiest ways to add smart access without changing your exterior hardware or rekeying.
• You value compact styling and a minimal look on the interior side of the door.
• You want rich software features (guest keys, schedules, activity history) and convenience rather than the absolute longest battery life.
• You have a stable 2.4 GHz Wi‑Fi network or are willing to invest time in optimizing your network (or use Bluetooth‑only mode) to reduce connectivity problems.

Should not buy if:

• You need a truly maintenance‑free lock that goes a year or more between battery changes — the August will likely require more frequent battery swaps if you use Wi‑Fi regularly.
• You run a mission‑critical setup where split‑second reliability and perfect cloud connectivity are mandatory (e.g., some commercial or high‑security deployments).
• You prefer a full deadbolt replacement with a different keyed exterior or want a hardwired power option.

Overall, the August Wi‑Fi Smart Lock (4th Gen) is a strong pick for homeowners who prioritize fast, key‑preserving installation and a feature‑rich app, and who accept the tradeoff of more active battery maintenance and occasional connectivity troubleshooting.