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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-09-21 · 6 min read · Independent comparison
If you want a feature-rich open-ear set with a companion app, personalized EQ and a longer single-charge runtime, choose HAKII Open Ear; if you need a simpler, punchier pick with a longer total playtime and a quicker case recharge, choose Monster Open Ear AC317.
• HAKII Open Ear biggest strength: A genuinely light 7.5g-per-bud clip-on design with a flexible titanium core, 12mm drivers, app-based EQ and Find My Earbuds.
• HAKII Open Ear biggest trade-off: No active noise cancellation and only single-device Bluetooth pairing — you give up multi-device switching.
• Monster Open Ear AC317 biggest strength: Long 24-hour total playtime with a fast one-hour case recharge, plus AI noise reduction for calls.
• Monster Open Ear AC317 biggest trade-off: No app, no personalized EQ, and a shorter 180-day warranty versus HAKII's 1 year.
• Pick HAKII Open Ear if you want granular control over your sound and a lighter, more technical fit.
• Pick Monster Open Ear AC317 if you want fuss-free listening with maximum uptime and the lowest maintenance.
The HAKII Open Ear is built around a clip-on hook design that weighs just 7.5g per earbud. That number matters more than it looks. Most open-ear sets that clamp onto the ear start to feel like a mild squeeze after an hour or two. HAKII pairs the light weight with a flexible titanium core and a soft silicone grip, so the bud hugs the ear instead of pressing on it. For runners, cyclists and anyone who wears these for a full workday, that combination is the whole point.
The audio side is more ambitious than most budget open-ears. The 12mm dynamic drivers run a 20–20,000 Hz frequency range with 32-ohm impedance and 104 dB sensitivity, and HAKII's AbTube tech is meant to push bass and vocals out while keeping leakage down. The spec I'd actually flag for buyers: 80 ms latency over Bluetooth 5.4. That's low enough that lip-sync on video and casual mobile gaming won't feel off. The brand's own description confirms there's no active noise cancellation — instead you get ENC for call clarity, which keeps you aware of traffic and conversation. That's a safety feature as much as an audio one.
Monster Open Ear AC317: Who It's For
The Monster Open Ear AC317 takes the opposite approach: fewer knobs, more uptime. The headline is 7 hours per charge and up to 24 hours total with the case, and the case itself refills in about an hour over USB-C. If your routine is "grab and go, don't think about charging," that's a meaningfully better experience than a set you're constantly topping up.
It's also a hook-style open-ear with a flexible ear hook and a balanced earbud weight design, so it stays put without clamping. Monster leans on a unique nozzle design that redirects sound waves toward the ear while cutting leakage — the same core idea as HAKII's AbTube, just described differently. The drivers are dynamic, and Monster claims its digital audio processor lifts the mid and high frequencies for a brighter, more forward presentation. The brand's copy also notes an IPX5 waterproof rating, so rain and sweat aren't a problem.
For calls, the AC317 uses an AI noise reduction algorithm to pull your voice out of background noise — genuinely useful on a windy street or a noisy gym. Controls are touch-only; there's no app, no EQ customization and no find-my feature. The enclosure is plastic in dark black, and the warranty runs 180 days, which is shorter than HAKII's year. Buy it if you want long battery life, fast case charging and clear calls with zero setup. Skip it if you want to tune your sound or track a misplaced bud through an app.
• Best battery life (total) → Monster Open Ear AC317: 24 hours with the case versus HAKII's 18.
• Best single-charge runtime → Monster Open Ear AC317: 7 hours per charge versus HAKII's 6.
• Fastest case recharge → Monster Open Ear AC317: roughly 1 hour versus HAKII's 1.5 hours.
• Best sound customization → HAKII Open Ear: personalized EQ modes, voice control and Find My Earbuds via the HAKII app.
• Lightest fit → HAKII Open Ear: 7.5g per bud with a titanium core and silicone grip.
• Best for low-latency video and gaming → HAKII Open Ear: the 80 ms latency spec matters more than most shoppers realize.
• Best for clear calls in noise → Monster Open Ear AC317: AI noise reduction is designed specifically for that.
• Longest warranty → HAKII Open Ear: 1 year versus 180 days.
• Best for a no-app, no-fuss setup → Monster Open Ear AC317: touch controls only, nothing to configure.
I'd buy the HAKII Open Ear. The app-based EQ, the 7.5g-per-bud weight and the 80 ms latency are the three specs that actually change how these feel day to day, and they're the reasons I'd reach for HAKII over the Monster. If your priority is pure uptime — long battery, fast charging, zero setup — the AC317 is the smarter pick, and I won't pretend otherwise. But for someone who wants to shape their sound and forget the buds are there, HAKII wins. Check the current price on Amazon before you commit.
Both are open-ear, IPX5-rated and hook-style, so both handle sweat and rain. HAKII is lighter per bud at 7.5g and adds an app with Find My Earbuds, which is handy if a bud slips out mid-run. Monster counters with longer total battery and AI noise reduction for calls.
No. It's touch-control only, with no companion app, no EQ customization and no find-my feature listed. If you want to tune your sound profile, the HAKII Open Ear's app is the one that offers it.
The Monster Open Ear AC317 leans explicitly on AI noise reduction to isolate your voice, so I'd expect it to hold up better in loud environments. HAKII uses ENC for call clarity instead. Both are designed for clear hands-free calls, just with different approaches.
HAKII's own description says its open earbuds connect to one device at a time. Monster doesn't list multi-device pairing either, so plan on reconnecting manually if you switch between a laptop and phone.
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