What is the wireless repeater with the highest compatibility with various routers?

Product ⇅ Price ⇅ Frequency Bands (NA) ⇅ Max Transmission Power (dBm) ⇅ Number of Antennas (NA) ⇅ Max Supported Speed (Mbps) ⇅ Range Coverage (sq ft) ⇅ Port Count (NA) ⇅
NETGEAR Nighthawk EX7300 X4 AC2200 WiFi Range Extender
US 		— Dual-band 2.4 GHz and 5 GHz — Internal antenna array (number not specified) Up to 2200 Mbps Up to 10,000 ft² One Gigabit Ethernet port

The EX7300 is a wall-plug AC2200 dual-band mesh WiFi extender with MU‑MIMO, FastLane technology, Smart Roaming and a Gigabit Ethernet port for wired devices. It extends 2.4 GHz and 5 GHz networks up to about 10,000 ft² and is designed for seamless roaming with an existing router.

★ Ideal for

Ideal for maximum router compatibility because it supports dual‑band 802.11 a/b/g/n/ac and explicitly states universal compatibility with any WiFi router/gateway.

Sources:
Newegg
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NETGEAR Nighthawk EX8000 X6S Tri-Band WiFi Mesh Extender
US 		£123.68 ≈ 2.4 GHz, 5 GHz — 6 internal 3000 Mbps 168 ft 4 Ethernet, 1 USB 2.0

Tri-band AC3000 extender with FastLane3 technology, a dedicated 4x4 5 GHz radio for backhaul, Smart Roaming and four Gigabit Ethernet ports; suits users who need strong whole-home coverage and wired connections. It supports AC3000 combined speeds and works with any router.

★ Ideal for

Good for highest-compatibility repeater needs because it supports 2.4 GHz and 5 GHz 802.11 a/b/g/n/ac routers, works with any router, and offers a dedicated 4x4 5 GHz backhaul plus Smart Roaming.

Sources:
SmallNetBuilder (buy link to Amazon)
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NETGEAR EX2800 AC750 WiFi Range Extender
US 		£29.97 ≈ Dual Band 2.4GHz & 5GHz — Internal 2 Up to 750 Mbps Up to 1,200 square feet None

Dual-band AC750 wall-plug extender that boosts 2.4GHz and 5GHz networks up to 750 Mbps, with two internal antennas and simple WPS or web-setup. Suited for filling home dead zones and streaming HD on existing routers without adding wired ports.

★ Ideal for

Ideal for highest compatibility because it supports 802.11ac and legacy 802.11 a/b/g/n routers and works with any standard WiFi router, enabling broad interoperability.

Sources:
Best Buy (Canada)
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Linksys RE7000 Max-Stream AC1900 WiFi Range Extender
US 		£37.84 ≈ 2.4 GHz, 5 GHz — — 1.9 Gbps — 1

Dual-band AC1900 extender with MU-MIMO, beamforming, and a gigabit Ethernet port for connecting wired devices. Works with any Wi‑Fi router and includes spot finder for optimal placement, suitable for eliminating dead zones in medium to large homes.

★ Ideal for

Ideal for maximum router compatibility because it supports universal mode (works with any Wi‑Fi router) and dual-band AC1900 MU‑MIMO for broad device support.

Sources:
Newegg
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TP-Link RE450 AC1750 WiFi Range Extender
US 		£35.93 ≈ 2.4GHz and 5GHz <20dBm (2.4GHz) <23dBm (5GHz) 3 Up to 450Mbps (2.4GHz) and up to 1300Mbps (5GHz) Up to 10,000 sq ft 1 Gigabit Ethernet port
TP-Link RE705X AX3000 WiFi Range Extender
US 		£97.43 ≈ 2.4GHz and 5GHz 2.4GHz ≤30dBm, 5GHz ≤30dBm 2 External Antennas 574 Mbps (2.4GHz), 2402 Mbps (5GHz) — 1 Gigabit Ethernet Port