MacBook Air M3 vs M4 UK: Which to Buy in 2026? Price, Specs, and Full Comparison
The MacBook Air M4 launched in early 2025, replacing the M3 generation. For UK buyers in 2026, the question is straightforward: buy the M4 new at full price, or save money on a discounted or refurbished M3? This guide gives a direct M3 vs M4 comparison covering UK prices in pounds, the actual performance difference, the 13-inch vs 15-inch choice, color options (including Midnight and Space Gray), the 16GB RAM configurations, and a clear recommendation for every buyer type.
For buying a MacBook Air on monthly payments, see our dedicated guide to MacBook on finance UK — 0% APR, pay monthly, and interest free options — covering Apple Finance and every UK MacBook payment plan.
MacBook Air M3 vs M4 — Key Specs Compared
| Spec | MacBook Air M3 | MacBook Air M4 |
| Chip | Apple M3 | Apple M4 |
| CPU | 8-core | 10-core |
| GPU | 10-core | 10-core (improved arch) |
| Neural Engine | 16-core | 16-core (faster) |
| Memory bandwidth | 100 GB/s | 120 GB/s |
| Min RAM | 8GB | 16GB (M4 starts at 16GB) |
| Max RAM | 24GB | 32GB |
| Thunderbolt | Thunderbolt 3 | Thunderbolt 4 |
| External displays | 1 (2 when lid closed) | 2 simultaneously (lid open) |
| MagSafe | ✅ | ✅ |
| Battery (13-inch) | Up to 18 hours | Up to 18 hours |
| UK start price (new) | Discontinued — refurb from ~£799 | From £1,099 |
MacBook Air M4 UK Price — All Configurations
| MacBook Air M4 Config | UK Price | Notes |
| 13-inch, 16GB, 256GB | £1,099 | Base — best entry point |
| 13-inch, 16GB, 512GB | £1,299 | Recommended storage upgrade |
| 13-inch, 24GB, 512GB | £1,499 | More RAM for heavier tasks |
| 13-inch, 32GB, 512GB | £1,699 | Maximum RAM for power users |
| 15-inch, 16GB, 256GB | £1,299 | Large screen; same chip |
| 15-inch, 16GB, 512GB | £1,499 | 15-inch recommended config |
| 15-inch, 24GB, 512GB | £1,699 | 15-inch with more RAM |
MacBook Air M3 UK Price — Refurbished and Discounted
Apple discontinued the MacBook Air M3 when M4 launched. UK routes to an M3 MacBook Air in 2026:
| Source | Price Range | Notes |
| Apple Refurbished Store | From £849-949 | Certified; full Apple warranty; limited stock |
| Back Market UK | From £799-899 | Graded A/B; 12-month warranty |
| Amazon Warehouse | From £849 | Grade ‘Good’ or ‘Acceptable’ |
| John Lewis (clearance) | From £899 | Selected M3 stock; JL 2-year guarantee |
| eBay UK (private) | From £720-800 | No warranty; PayPal protection only |
MacBook Air M3 vs M4 — Performance Difference: Is It Worth Upgrading?
The M4 chip delivers approximately 20-25% faster CPU performance and 30-35% faster GPU performance versus M3. The memory bandwidth increase from 100 GB/s to 120 GB/s also makes a noticeable difference in memory-intensive tasks. However, for everyday use, the real-world difference is less dramatic than the benchmark numbers suggest:
Tasks Where M4 Is Noticeably Faster
- Photo and video editing: M4’s faster GPU accelerates Lightroom AI masking, Photoshop generative fill, and Final Cut Pro rendering by 25-35%
- Machine learning and AI: M4’s improved Neural Engine processes on-device AI tasks (image classification, transcription) meaningfully faster
- Large compilation tasks: Software development builds in Xcode are approximately 20% faster on M4
- Sustained workloads: M4 maintains peak performance longer in sustained tasks — the thermal envelope is better managed
Tasks Where M3 and M4 Feel Identical
- Web browsing, email, and communication apps (Slack, Teams, Zoom)
- Office productivity (Word, Excel, PowerPoint, Pages, Numbers)
- Light photo editing in Lightroom or Photos
- Streaming video (Netflix, YouTube, Apple TV+)
- Casual gaming through Apple Arcade
Verdict: For everyday productivity, M3 and M4 feel essentially identical in day-to-day use. The M4 advantage is meaningful for creative professionals and power users but invisible to everyday users. This makes the M3 refurbished an excellent value proposition for non-professional buyers.
MacBook Air M4 13-inch vs 15-inch UK — Which Size?
| Factor | 13-inch M4 | 15-inch M4 |
| Display size | 13.6-inch Liquid Retina | 15.3-inch Liquid Retina |
| Resolution | 2560 x 1664 pixels | 2880 x 1864 pixels |
| Weight | 1.24kg | 1.51kg |
| Battery life | Up to 18 hours | Up to 15 hours |
| UK starting price | £1,099 | £1,299 |
| Chip | M4 (identical) | M4 (identical) |
| Best for | Portability; travel; compact use | Desk use; content creation; larger screen |
- Choose 13-inch if: You carry it daily, travel frequently, or primarily use it at a desk with an external monitor where screen size is less relevant. The 13-inch’s 1.24kg weight and 18-hour battery make it the best portable laptop available.
- Choose 15-inch if: The MacBook will be your primary screen for most of your day, you watch a lot of content, or you find 13-inch screens cramped for multitasking. The extra screen space makes a genuine difference for side-by-side document work.
- The 15-inch is not faster: Both sizes use identical M4 chips with no performance difference. You are paying £200 extra for the larger display and slightly more battery life (15 vs 18 hours in Apple’s testing).
MacBook Air Colors UK — M4 Color Options
The MacBook Air M4 is available in four colors in the UK:
| Color | Description |
| Midnight | Very dark blue-black — the most popular color; anodized aluminum; resists fingerprints reasonably well |
| Starlight | Warm silver with a slight gold tint — premium look; very clean |
| Sky Blue | Light blue — a new color introduced with the M4 generation |
| Silver | Classic MacBook silver — timeless and neutral |
Midnight vs Space Gray MacBook Air
Searches for ‘space gray MacBook Air’ and ‘space grey MacBook’ refer to the color that Apple used on MacBook Air models from 2018-2022. Space Gray was discontinued with the M2 MacBook Air — the darkest color on M3 and M4 MacBook Air is Midnight (a dark blue-black, not gray). If you specifically want the Space Gray aesthetic, a refurbished M2 MacBook Air in Space Gray is the only current option. The M4’s Midnight color is a different shade — darker and with a blue undertone rather than gray.
MacBook Air 16GB RAM UK — M3 vs M4 Configurations
Apple changed the base RAM configuration with M4 — the M4 MacBook Air starts at 16GB, whereas the M3 started at 8GB. This is one of the most significant practical improvements of the M4 generation for UK buyers:
- M3 MacBook Air base (8GB): Still adequate for light everyday use in 2026 — but 8GB shows memory pressure under heavy multitasking. M3 8GB models available refurbished at lower prices but not recommended as a new purchase.
- M3 MacBook Air 16GB: The M3 with 16GB is an excellent configuration that will remain capable for 5+ years. Available refurbished from approximately £899 (Back Market). Strong value for buyers who want M3 performance at a lower price.
- M4 MacBook Air 16GB (base): The M4 base at £1,099 now includes 16GB as standard — a significant improvement over the M3 base. This is the recommended starting point for new MacBook Air buyers in 2026.
- M4 MacBook Air 24GB (£1,499): Recommended for creative professionals — video editing, music production, graphic design. The 24GB unified memory eliminates memory pressure even under demanding workloads.
MacBook Air M3 Refurbished UK — Is It Still a Good Buy?
Yes — a refurbished MacBook Air M3 with 16GB RAM is an excellent purchase in 2026 for UK buyers who want to save £200-300 versus the M4:
- Performance for everyday tasks: Identical to M4 for browsing, email, office work, and light creative tasks
- Software support: Apple typically supports Mac chips for 7+ years. M3 Macs will receive macOS updates through at least 2030-2031.
- Build quality: The M3 MacBook Air uses the same aluminum unibody design as M4 — identical build quality and keyboard.
- Thunderbolt 3 vs 4: The M3 has Thunderbolt 3 (40 Gb/s) versus M4’s Thunderbolt 4 (40 Gb/s with additional features). For most users, this difference is irrelevant.
- External display limitation: The M3 supports only one external display with the lid open (two with lid closed). The M4 supports two displays simultaneously with the lid open — relevant if you use a dual-monitor desk setup.
Recommended M3 refurbished configuration: MacBook Air M3 13-inch, 16GB RAM, 256GB or 512GB — from approximately £849-949 via Apple Refurbished or Back Market UK.
Should You Buy MacBook Air M3 or M4?
| Buyer Type | Recommendation |
| Budget-conscious everyday user | M3 refurbished 16GB — save £200-300 vs M4 |
| Student | M4 base 16GB (£1,099) — starts with 16GB, longer support life |
| Creative professional | M4 with 24GB (£1,499) — better sustained performance |
| Dual-monitor desk user | M4 — supports 2 external displays with lid open |
| Upgrading from Intel Mac | Either M3 or M4 — both are transformative improvements |
| Upgrading from M2 | Wait — M4 is worthwhile upgrade; M3 is marginal |
| Upgrading from M3 | No — not worth upgrading to M4; skip to M5 |
For the full guide to MacBook Pro M5 and whether to choose Air vs Pro, see our detailed breakdown of the MacBook Pro M5 UK — specs, price in £GBP, and Air vs Pro comparison.
For current MacBook Air M4 UK pricing and configurations, see the Apple MacBook Air UK official page. For refurbished MacBook Air M3 UK stock and grades, see Back Market MacBook Air UK.
MacBook Air M4 — What Has Actually Changed in Day-to-Day Use?
Beyond the spec numbers, what does the M4 actually feel like compared to M3 for a typical UK buyer? The honest answer for everyday use: largely identical. Where you notice the difference:
• App launch speed: M4 opens apps approximately 15-20% faster than M3 — perceptible but not dramatic in daily use.
• Battery charging: M4 supports faster MagSafe charging — from 0% to 50% in approximately 30 minutes with the 70W adapter.
• External display support: This is the most practically impactful M4 change for desk users. M4 can drive two 6K external monitors simultaneously with the lid open. M3 is limited to one external display when the lid is open — this is a significant practical difference for dual-monitor workflows.
• Memory baseline: The M4’s 16GB base (vs M3’s 8GB) means the entry MacBook Air M4 has meaningfully more breathing room for memory under load than the M3 base.
• Thermal management: M4 runs slightly cooler and more efficiently than M3 — the 3nm process improvements mean the fanless design works more comfortably under sustained load.
MacBook Air M4 vs MacBook Pro M5 — When to Upgrade to Pro?
A common UK buyer question: should I get the MacBook Air M4 or spend more on the MacBook Pro M5? The honest answer depends on one key factor — sustained performance under load.
• MacBook Air M4 (fanless): The Air has no fan. Under sustained heavy workloads (long video renders, large compilation tasks, extended ML training), the Air throttles performance to manage heat. For bursts of demanding work, performance is excellent. For hours of sustained peak performance, the Pro is better.
• MacBook Pro M5 (active cooling): The Pro’s fan allows it to sustain peak performance indefinitely. For professional video editors, music producers, and developers running demanding builds, this matters significantly.
• Display quality: The MacBook Pro M5 has a ProMotion 120Hz display — noticeably smoother for scrolling, animation, and cursor movement. The MacBook Air M4’s display is fixed at 60Hz.
• Port selection: The MacBook Pro has HDMI, SD card slot, and three Thunderbolt 5 ports — significantly better connectivity than the Air’s two Thunderbolt 4 ports.
• Recommendation: MacBook Air M4 for 90% of buyers — including most students, general users, and even light creative professionals. MacBook Pro M5 for professionals who depend on the laptop for intensive creative work and need sustained peak performance.
MacBook Air M4 1TB — Storage Upgrade Worth It?
The MacBook Air M4 is available with 256GB, 512GB, and 1TB storage options. Key points for UK buyers:
• 256GB: The base storage. Manageable if you use iCloud Drive (Apple One plan or iCloud+ from £0.99/month) for photos, documents, and large files. Tight if you want to keep large local media libraries or avoid cloud storage.
• 512GB (recommended): The recommended storage for most buyers — enough local space for apps, projects, and a reasonable media library without cloud dependency.
• 1TB: Worth the upgrade if you work with large video files, have an extensive local music or photo library, or prefer not to use cloud storage. The price premium (approximately £200 over 256GB) is justified for these use cases.
• Cannot upgrade later: Like all Apple Silicon Macs, the MacBook Air M4’s storage is soldered — it cannot be upgraded after purchase. Buy the storage you expect to need for the laptop’s 4-6 year lifespan.
For UK buyers making this decision in mid-2026, the timing is good — the M4 MacBook Air has been available long enough for refurbished M3 stock to appear at meaningful discounts, while the M5 MacBook Air is not expected until 2026-2027 (meaning the M4 is a fresh purchase with full support life ahead). Whether you choose M4 new or M3 refurbished, both are exceptional machines that will serve you well for 5+ years of daily use.
Bottom Line
| Best MacBook Air for most UK buyers | M4 13-inch, 16GB, 256GB — £1,099 |
| Best value option | M3 refurbished 16GB — from ~£849 (Back Market) |
| M4 performance vs M3 | ~20-25% CPU faster; 30-35% GPU faster |
| 13-inch vs 15-inch? | 13-inch for portability; 15-inch for screen space |
| Best color? | Midnight (most popular) or Silver (classic) |
| Space Gray available on M4? | No — Space Gray discontinued; closest is Midnight |
| 16GB vs 24GB? | 16GB for most; 24GB for creative professionals |
| M3 still worth buying? | Yes — refurbished 16GB is excellent value |
| Upgrade from M3 to M4? | No — skip to M5 when it arrives |
Frequently Asked Questions
Should I buy MacBook Air M3 or M4 in the UK?
For most UK buyers, the MacBook Air M4 at £1,099 is the better choice — it starts with 16GB RAM as standard (M3 started at 8GB), delivers 20-25% faster CPU performance, supports two external displays simultaneously, and has a longer software support life ahead of it. The M3 refurbished at £849-949 is compelling for budget-conscious buyers who do not need the dual-display capability.
How much is the MacBook Air M4 in the UK?
The MacBook Air M4 13-inch starts at £1,099 (16GB RAM / 256GB storage) in the UK. The 15-inch starts at £1,299. Upgraded configurations with 512GB storage or 24GB RAM range from £1,299 to £1,699. All UK prices include 20% VAT. Education pricing offers a discount of approximately £50-120 for eligible students and educators.
Is MacBook Air M3 still worth buying in 2026?
Yes — a refurbished MacBook Air M3 with 16GB RAM is excellent value in 2026. M3 performance matches M4 for everyday tasks, Apple will support M3 Macs with software updates through at least 2030, and the build quality is identical. The main limitations versus M4: only one external display with lid open, and slightly lower CPU/GPU performance for demanding creative tasks.
What colors does the MacBook Air M4 come in?
The MacBook Air M4 comes in four colors: Midnight (dark blue-black), Starlight (warm silver-gold), Sky Blue (light blue), and Silver. Space Gray — available on older MacBook Air models — was discontinued with the M2 generation. The M4’s Midnight is the closest equivalent, but it is a dark blue-black rather than gray.
Is 16GB enough for MacBook Air M4?
Yes — 16GB is the right amount of RAM for the vast majority of MacBook Air buyers. Apple’s unified memory architecture means 16GB on M4 performs comparably to 24-32GB on Windows laptops for most tasks. Choose 24GB if you regularly do professional video editing, run large music production sessions, or need to run memory-intensive applications simultaneously.
What is the difference between MacBook Air M3 and M4?
The M4 MacBook Air has a 10-core CPU (vs M3’s 8-core), higher memory bandwidth (120 GB/s vs 100 GB/s), support for two simultaneous external displays with the lid open (M3 only supports one), starts at 16GB RAM standard (M3 started at 8GB), uses Thunderbolt 4 (vs M3’s Thunderbolt 3), and delivers approximately 20-25% better CPU and 30-35% better GPU performance.