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Nothing CMF Buds 2 vs Tronsmart Onyx Ace: 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 5 of 7 measures.

  • Nothing CMF Buds 2
  • Tronsmart Onyx Ace
HearWiki score
82
51
Sound
7.7
5.4
Noise cancelling
7.8
-
Battery
8.8
4.8
Calls
6.5
6.9
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 Onyx Ace (2020). Neither is straightforwardly newer: the Nothing CMF Buds 2 brings ANC type Hybrid against None, while the Tronsmart Onyx Ace answers with Top codec aptX against AAC. The Nothing CMF Buds 2 answers on convenience features: it adds Multipoint pairing, Wear detection, Transparency mode and Custom EQ.

  • CMF Buds 220255 yr newer
  • Onyx Ace2020
What differsCMF Buds 2Onyx Ace

Platform

Top codec
AAC
aptX
ANC type
Hybrid
None

Everyday features

Multipoint pairing
Yes
No
Wear detection
Yes
No
Transparency mode
Yes
No
Custom EQ
Yes
No
Companion app
Yes
No
Water resistance
IP55
IPX5

Level on: USB-C.

Specifications

CMF Buds 2Onyx Ace
Type
True Wireless
True Wireless
Price (USD)
$37
$25
HearWiki score
82
51
Released
2025
2020
Availability
Sold new
Discontinued
Driver
11 mm driver
13 mm dynamic
Driver type
dynamic
dynamic
Driver size
11 mm
13 mm
Drivers per side
1
1
Frequency response
20 Hz - 20 kHz
20 Hz - 20 kHz
Impedance
-
32 Ω
Bluetooth
5.4
-
Codecs
SBC, AAC
SBC, AAC, aptX
Multipoint pairing
Yes
No
Latency
110 ms
-
Wireless range
10 m
15 m
Battery life
13.5 h
5 h
Battery life (ANC on)
7.5 h
-
Battery incl. case
55 h
24 h
Full charge time
93 min
80 min
Quick charge
10 min → 4 h
10 min → 1 h
Wireless charging
No
No
Active noise cancelling
Yes
No
ANC type
hybrid
none
Transparency mode
Yes
No
Companion app
Yes
No
Custom EQ
Yes
No
Wear detection
Yes
No
Controls
touch
touch
Voice assistant
Yes
Yes
Weight
4.5 g
4 g
Case weight
41.5 g
37 g
Water resistance
IP55
IPX5
USB-C
Yes
Yes
Microphones
6
4
Call noise reduction
-
Yes

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 Onyx Ace

The Tronsmart Onyx Ace are affordable half-in-ear wireless earbuds that prioritize call clarity and everyday comfort. They offer a bass-forward sound with reliable touch controls and a compact, USB-C charging case that extends total playtime to around 24 hours. While not the most refined for music, they deliver solid value for budget-conscious users seeking dependable communication earbuds.

  • Pro:Excellent call quality with four microphones
  • Pro:Very comfortable half-in-ear fit
  • Pro:Responsive touch controls
  • Con:Sound is less refined than top budget rivals
  • Con:Treble can sound muted
  • Con:Touch controls may be overly sensitive

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

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