Acefast Acefit Air vs JLab Flex Open Earbuds: which should you buy?

On aggregated review scores the Acefast Acefit Air comes out ahead with a HearWiki score of 78. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: Acefast Acefit Air - Great overall at around $22.

Open-Ear

Score breakdown

Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.

Acefast Acefit Air leads on 4 of 6 measures.

Acefast Acefit Air
JLab Flex Open Earbuds

HearWiki score

Sound

7.0

7.1

Battery

5.4

6.5

Calls

6.8

6.2

Value

9.3

9.1

Price (USD)

$22

$40

Generation & platform

The scores rank quality. This is the other question: is the newer one actually newer technology, or the same platform in a new shell?

Same generation

Acefast Acefit Air (2025) against JLab Flex Open Earbuds (2024). These are the same generation of hardware - nothing in the radio, the codecs or the noise cancelling separates them. The platform is level; the newer hardware shows up in convenience features instead - the JLab Flex Open Earbuds adds Water resistance IP55 against IP54.

Acefit Air20251 yr newer
Flex Open Earbuds2024

What differsAcefit AirFlex Open Earbuds

Water resistance: IP54; IP55

Level on: Bluetooth, Top codec, Multipoint pairing, USB-C, Custom EQ, Companion app.

Specifications

Acefit AirFlex Open Earbuds

Type: Open-Ear; Open-Ear
Price (USD): $22; $40
HearWiki score: 78; 76
Released: 2025; 2024
Availability: Sold new; Still sold new
Driver: 20 mm dynamic; 12 mm dynamic
Driver type: dynamic; dynamic
Driver size: 20 mm; 12 mm
Drivers per side: 1; 1
Frequency response: 50 Hz - 20 kHz; 20 Hz - 20 kHz
Impedance: 32 Ω; 12 Ω
Sensitivity: 90 dB/mW; -
Bluetooth: 5.4; 5.4
Codecs: SBC, AAC; SBC, AAC
Multipoint pairing: Yes; Yes
Latency: -; 200 ms
Wireless range: 10 m; 9 m
Battery life: 6 h; 7 h
Battery incl. case: 25 h; 21 h
Full charge time: 60 min; 120 min
Quick charge: 10 min → 2 h; 10 min → 1 h
Wireless charging: No; -
Active noise cancelling: No; No
ANC type: -; none
Transparency mode: -; No
Companion app: Yes; Yes
Custom EQ: Yes; Yes
Wear detection: -; No
Controls: touch; touch
Voice assistant: -; Yes
Weight: -; 12 g
Case weight: -; 36.8 g
Water resistance: IP54; IP55
Detachable cable: -; No
USB-C: Yes; Yes
Microphones: 4; 4
Microphone type: -; MEMS
Mic sensitivity: -; -38 dBV
Call noise reduction: -; Yes
Call NR technology: -; 2-mic ENC

Specification comparison of Acefast Acefit Air vs JLab Flex Open Earbuds
Spec	Acefast Acefit Air	JLab Flex Open Earbuds
Type	Open-Ear	Open-Ear
Price (USD)	$22	$40
HearWiki score	78 / 100 Great	76 / 100 Great
Released	2025	2024
Audio
Driver	20 mm dynamic	12 mm dynamic
Driver type	dynamic	dynamic
Driver size	20 mm	12 mm
Drivers per side	1	1
Frequency response	50 Hz - 20 kHz	20 Hz - 20 kHz
Impedance	32 Ω	12 Ω
Sensitivity	90 dB/mW	-
Wireless
Bluetooth	5.4	5.4
Codecs	SBC, AAC	SBC, AAC
Multipoint pairing	Yes	Yes
Latency	-	200 ms
Wireless range	10 m	9 m
Battery
Battery life	6 h	7 h
Battery incl. case	25 h	21 h
Full charge time	60 min	120 min
Quick charge	10 min → 2 h	10 min → 1 h
Wireless charging	No	-
Features
Active noise cancelling	No	No
ANC type	-	none
Transparency mode	-	No
Companion app	Yes	Yes
Custom EQ	Yes	Yes
Wear detection	-	No
Controls	touch	touch
Voice assistant	-	Yes
Design
Weight	-	12 g
Case weight	-	36.8 g
Water resistance	IP54	IP55
Detachable cable	-	No
USB-C	Yes	Yes
Calls
Microphones	4	4
Microphone type	-	MEMS
Mic sensitivity	-	-38 dBV
Call noise reduction	-	Yes
Call NR technology	-	2-mic ENC

What reviewers said

Acefast Acefit Air

The Acefast Acefit Air offers a sleek, comfortable open-ear design that stays secure during workouts, making it a strong budget pick for sports and everyday use. While the sound is decent for the price, it lacks the engagement needed for intense exercise, especially in windy conditions, and skips premium extras like ANC and wireless charging. Overall, it's a practical, affordable option for those prioritizing awareness and fit over immersive audio.

Pro:Very comfortable and secure fit for sports
Pro:Sleek, lightweight open-ear design
Pro:Good value for budget buyers

Con:Sound lacks engagement, especially in wind
Con:No ANC or wireless charging
Con:Not ideal for noisy environments

JLab Flex Open Earbuds

The JLab Flex Open Earbuds are an affordable open-ear option that clips onto your ear, featuring 12mm dynamic drivers and Bluetooth 5.4 with multipoint support. They offer around 7 hours of playback per charge, extending to 21 hours with the charging case, and boast an IP55 rating for dust and water resistance. With touch controls, a customizable EQ, and a lightweight 12-gram design, these earbuds prioritize comfort and practicality over noise cancellation.

Pro:Lightweight and secure open-ear fit
Pro:Long battery life with charging case
Pro:IP55 dust and water resistance

Con:No active noise cancellation
Con:SBC and AAC codecs only
Con:Sound may leak at high volumes

Summaries are AI-condensed and paraphrased from published reviews and specs - not original hands-on testing. More on our method.

Compare something else

Swap either side out, or start again from the picker.

New comparison Acefast Acefit Air JLab Flex Open Earbuds