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Nothing CMF Buds 2 vs Tronsmart Onix Free: which should you buy?

On aggregated review scores the Nothing CMF Buds 2 comes out ahead with a HearWiki score of 82. The full breakdown - sub-scores, specs and what reviewers actually said - is below.

Our pick: Nothing CMF Buds 2 - Outstanding overall at around $37.

Score breakdown

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

Nothing CMF Buds 2 leads on 6 of 7 measures.

  • Nothing CMF Buds 2
  • Tronsmart Onix Free
HearWiki score
82
58
Sound
7.7
6.2
Noise cancelling
7.8
-
Battery
8.8
5.8
Calls
6.5
6.1
Value
9.4
-
Price (USD)
$37
$25

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?

Mixed generations

Nothing CMF Buds 2 (2025) against Tronsmart Onix Free (2020). Neither is straightforwardly newer: the Nothing CMF Buds 2 brings Bluetooth 5.4 against 5.0 and ANC type Hybrid against None, while the Tronsmart Onix Free answers with Top codec aptX against AAC. The Nothing CMF Buds 2 answers on convenience features: it adds Multipoint pairing and Water resistance IP55 against IPX7.

  • CMF Buds 220255 yr newer
  • Onix Free2020
What differsCMF Buds 2Onix Free

Platform

Bluetooth
5.4
5.0
Top codec
AAC
aptX
ANC type
Hybrid
None

Everyday features

Multipoint pairing
Yes
No
Water resistance
IP55
IPX7

Level on: USB-C.

Specifications

CMF Buds 2Onix Free
Type
True Wireless
True Wireless
Price (USD)
$37
$25
HearWiki score
82
58
Released
2025
2020
Availability
Sold new
Discontinued
Driver
11 mm driver
6 mm dynamic
Driver type
dynamic
dynamic
Driver size
11 mm
6 mm
Drivers per side
1
-
Frequency response
20 Hz - 20 kHz
20 Hz - 20 kHz
Impedance
-
16 Ω
Bluetooth
5.4
5.0
Codecs
SBC, AAC
SBC, AAC, aptX
Multipoint pairing
Yes
No
Latency
110 ms
-
Wireless range
10 m
15 m
Battery life
13.5 h
7 h
Battery life (ANC on)
7.5 h
-
Battery incl. case
55 h
35 h
Full charge time
93 min
60 min
Quick charge
10 min → 4 h
-
Wireless charging
No
No
Active noise cancelling
Yes
No
ANC type
hybrid
none
Transparency mode
Yes
-
Companion app
Yes
-
Custom EQ
Yes
-
Wear detection
Yes
-
Controls
touch
buttons
Voice assistant
Yes
-
Weight
4.5 g
4 g
Case weight
41.5 g
36.2 g
Water resistance
IP55
IPX7
USB-C
Yes
Yes
Model code
-
Onyx Free
Microphones
6
4
Mic sensitivity
-
-42 dBV
Call noise reduction
-
Yes
Call NR technology
-
cVc 8.0

What reviewers said

Nothing CMF Buds 2

The Nothing CMF Buds 2 are an exceptional budget true-wireless option, packing a surprisingly rich feature set for their low price. They deliver engaging sound, robust battery life, and effective hybrid ANC, making them a top-value pick for most listeners.

  • Pro:Excellent value for the price
  • Pro:Strong battery life with ANC off
  • Pro:Effective hybrid active noise cancellation
  • Con:Call performance weak in noisy settings
  • Con:ANC and gaming latency not class-leading
  • Con:No wireless charging support

Tronsmart Onix Free

The Tronsmart Onyx Free are compact true wireless earbuds that prioritize treble and light bass, offering a sound that won't top charts but remains serviceable. They stand out with reliable call quality, physical button controls, and a secure fit that holds up even during sleep, making them a solid budget option for daily commutes or nighttime use. Battery life is a step up from siblings in the same lineup, adding to their practicality.

  • Pro:Physical buttons for easy control
  • Pro:Good call quality for the price
  • Pro:Secure, comfortable fit for long wear or sleep
  • Con:Sound signature is treble-focused with weak bass
  • Con:Not competitive with best-in-class audio performance
  • Con:Plastic build may feel less premium

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

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New comparisonNothing CMF Buds 2Tronsmart Onix Free