True Wireless
Nothing CMF Buds 2a
78Great
$42
Full review dataNothing CMF Buds 2a vs Tronsmart Onix Free: which should you buy?
On aggregated review scores the Nothing CMF Buds 2a comes out ahead with an HearWiki score of 78. The full breakdown - sub-scores, specs and what reviewers actually said - is below.
Our pick: Nothing CMF Buds 2a - Great overall at around $42.
True Wireless
Tronsmart Onix Free
68Good
$25
Full review dataScore breakdown
Each axis is a 0–10 blend of what reviewers scored, not a lab measurement.
Nothing CMF Buds 2a
Sound8.0
Noise cancelling7.5
Battery7.0
Calls6.5
Value9.0
Tronsmart Onix Free
Sound6.0
Battery8.0
Calls7.0
Value8.0
Specifications
| Spec | Nothing CMF Buds 2a | Tronsmart Onix Free |
|---|---|---|
| Type | True Wireless | True Wireless |
| Price (USD) | $42 | $25 |
| HearWiki score | 78 / 100 · Great | 68 / 100 · Good |
| Released | 2024 | 2020 |
| Audio | ||
| Driver | 12.4mm Bio-fibre | 6mm PU dynamic drivers |
| Driver size | 12.4 mm | 6 mm |
| Drivers per side | 2 | - |
| Frequency response | 20Hz-20kHz | 20Hz-20kHz |
| Impedance | - | 16 Ω |
| Sensitivity | - | -42 dB/mW |
| Wireless | ||
| Bluetooth | 5.4 | Qualcomm aptX |
| Bluetooth version | 5.4 | 5.0 |
| Codecs | AAC, SBC | SBC, AAC, aptX |
| Multipoint pairing | Yes | No |
| Wireless range | - | 15 m |
| Battery | ||
| Battery life | 8 h | 7 h |
| Battery life (ANC on) | 5 h | - |
| Battery incl. case | 35.5 h | 35 h |
| Full charge time | 89 min | 60 min |
| Quick charge | 10 min = 5.5 h | - |
| Wireless charging | No | No |
| Features | ||
| Active noise cancelling | Yes | No |
| ANC type | feedforward | none |
| Transparency mode | Yes | - |
| Companion app | Yes | - |
| Custom EQ | Yes | - |
| Wear detection | No | - |
| Controls | touch | buttons |
| Voice assistant | Yes | - |
| Design | ||
| Weight | 4.28 g | 4 g |
| Case weight | 42.75 g | 36.2 g |
| Water resistance | IP54 | IPX7 |
| USB-C | Yes | Yes |
| Model code | - | Onyx Free |
| Calls | ||
| Microphones | 4 | 4 |
| Call noise reduction | - | cVc 8.0 |
What reviewers said
Nothing CMF Buds 2a
The Nothing CMF Buds 2a deliver a compelling mix of solid audio performance, adaptive noise cancellation, and long battery life at a very accessible price point. They are a practical pick for budget-conscious listeners who want reliable everyday earbuds with app-based customization, though they come with some expected trade-offs in materials and features.
- Pro:Strong value for the price
- Pro:Adaptive ANC with 42 dB reduction
- Pro:Good battery life with case
- Con:Plasticky build quality
- Con:No in-ear detection
- Con:Limited codec support (AAC, SBC)
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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