How we review
Our reviews are research-based. We read Apple's and each maker's current documentation, score what it says against a fixed rubric, and show the evidence for every score.
Researched, not hands-on tested
What "research-based" means
- Every score comes from documentation we read and dated: Apple Support articles and technical specifications, and the maker's product pages, FAQs and knowledge-base articles.
- We have not bought, borrowed or received any product we review. We have not measured, photographed or physically tested any of them.
- We do not use user reviews, star ratings, forum posts or other publications' scores as evidence.
- Product art on review pages is our own illustration of the documented port types. It is not a product photo and does not show the real port layout.
The rubric
Each product gets a score from 0 to 10 on six criteria. The overall score is the weighted average, rounded to one decimal. Every review shows the breakdown, a one-line evidence note and a source for each criterion.
| Criterion | What it asks | Weight |
|---|---|---|
| Mac compatibility documented | Does the maker list MacBook Air chips and macOS versions explicitly? | 30% |
| Two monitors on MacBook Air | Does it document two extended displays per chip, native or DisplayLink, and by lid state? | 25% |
| Display modes | What maximum resolution and refresh per screen is documented for Mac? | 15% |
| Charging | How much host power reaches the Mac, against what a MacBook Air uses? | 10% |
| Ports and connectivity | Which downstream ports are documented? | 10% |
| Software and limits | Does it need DisplayLink or other software, and what does that rule out (HDCP, managed Macs)? | 10% |
Mac compatibility documented (30%)
- 10: names every MacBook Air chip from M1 to M5, says what each supports, and gives a minimum macOS version.
- 8: names Apple silicon chips and a minimum macOS version, but not every chip through M5.
- 6: gives a minimum macOS version, without chip-level detail.
- 4: names Mac or MacBook Air as compatible, without a version or chip detail.
- 2: the maker advises against using it with a Mac.
- 0: no Mac compatibility statement.
- Minus 1 when the maker's own pages contradict each other on Mac support.
Two monitors on MacBook Air (25%)
- For each chip (M1, M2, M3, M4, M5): 2 points if the maker documents two extended external displays on that chip; 1 point if it documents them only with the lid closed, or documents one extended display on that chip; 0 if not documented.
- If the maker describes macOS behavior without naming chips: 2 if one extended display on a Mac is documented, otherwise 0.
- Mirrored screens never count as a second display.
Display modes (15%)
- 10: resolution and refresh documented per screen for two screens at 4K 60Hz or better, plus a higher single-screen mode.
- 8: 4K 60Hz per screen for two or more screens, stated for systems that include Mac.
- 6: one screen at 4K 60Hz stated for Mac.
- 4: 4K 60Hz only on some hardware revisions or hosts, otherwise 4K 30Hz.
- 2: a video port version is listed, with no resolution or refresh rate.
- 0: no display mode documented.
Charging (10%)
Reference: Apple says MacBook Air with M2 or M3 can fast charge with its 70W USB-C adapter, and ships 30W or 35W adapters with those models Apple documentation.
- 10: the dock's own power supply delivers 70W or more to the Mac.
- 8: pass-through charging of 70W or more to the Mac, from a USB-C charger you supply.
- 5: host charging below 70W, or a wattage with no host figure.
- 0: no host charging, or not documented.
Ports and connectivity (10%)
We count documented downstream ports, not video outputs, the host port or the power input.
- 10: 10 or more, including Ethernet and a downstream Thunderbolt port.
- 8: 8 or more, including Ethernet.
- 6: 5 to 7.
- 4: 3 or 4.
- 2: 1 or 2.
Software and limits (10%)
- 10: the maker states no driver or app is needed and documents HDCP (protected video) support.
- 9: the maker states no driver or app is needed, or lists its utility as optional; protected video not addressed.
- 5: the maker does not say whether software is needed.
- 3: DisplayLink Manager is required (admin rights and Screen Recording permission) and HDCP is not supported.
- 0: required software is not documented for current macOS.
Score labels
9.0 and above: Excellent. 8.0 to 8.9: Very good. 7.0 to 7.9: Good. 5.0 to 6.9: Mixed. Below 5.0: Limited. The labels describe how well the documentation supports a two-monitor MacBook Air desk. A single-monitor hub can be a good buy and still score Limited.
When something is not documented
If we cannot find or read a spec, the review says "Not documented" and the criterion scores as the rubric says for missing information. We do not fill gaps from memory, forums or other reviews. If a maker publishes the missing detail, we rescore and change the review date.
Evidence labels
- Apple documentationStated on an Apple Support article or technical specifications page for the named Mac.
- Manufacturer documentationStated by the maker of the dock, adapter, cable or software for the named product. We report it; we have not confirmed it ourselves.
- Not confirmedWe could not find or read documentation for that exact combination. It may work; we do not know.
- Not supportedThe documentation says it does not work.
There is a fifth label we have not used: Tested. It is reserved for a physical test of the exact configuration, with the record published alongside. No page carries it today, because we have not run any physical tests.
How a claim gets onto a page
- Start from the host. Apple's own pages decide what the Mac can do. A dock cannot exceed that limit, so we never infer a host capability from a dock page.
- Read the current primary source. We fetch the Apple or manufacturer page itself, note the date, and read the full compatibility section rather than one bullet.
- Match the configuration. A claim applies only where the source names the chip, lid state, OS and mode. "Works with Mac" does not count as evidence for a specific MacBook Air.
- Record gaps. If a source is unavailable to us (for example a PDF we cannot read), or it is silent on the case, the page says so and labels the case not confirmed.
- Note conflicts. When a maker's page contradicts itself or Apple, we show both, rely on the more specific statement, and apply the rubric's deduction.
How we would record a physical test
If we test a setup in future, the record will include the Mac model, chip, macOS version, lid state, port used, dock model and firmware, host cable, each output cable or adapter, each monitor model and input, the resolution and refresh rate shown in System Settings, sleep and wake behavior, and charging status. The result applies to that configuration only.
What we do not do
- We do not describe a product as tested without a recorded physical test of it.
- We do not publish user reviews, star ratings or scores we did not derive from this rubric.
- We do not treat a connector shape or a Thunderbolt logo as proof of display support.
- We do not accept payment or free products in exchange for coverage, and we have no affiliate links. See the disclosure.
Review date
All pages were last reviewed against their sources on . Apple and manufacturers change their pages; if a source changes, the review, its score and the roundup are updated together.
Sources for the rubric
- Apple Support: How many displays can be connected to MacBook Air Apple documentation
- Apple Support: 13-inch MacBook Air with M2 technical specifications Apple documentation
- Apple Support: 13-inch MacBook Air with M3 technical specifications Apple documentation