TP-Link Archer AX21 vs ASUS RT-AX55

TP-Link Archer AX21

WiFi 6 router with 1800 Mbps total throughput, 4 external antennas, and TP-Link Tether app.

ASUS RT-AX55

WiFi 6 router with 3000 Mbps total throughput and ASUS AiProtection.

Quick verdict

Buy Archer AX21 if: small home or apartment, budget is tight, no plans to expand. Buy RT-AX55 if: you may need to extend coverage later, you want AiProtection security features, or you are willing to pay a small premium for a more capable platform.

Head-to-head

The differences that actually change the buying decision.

Coverage Performance

Both routers provide comparable coverage in smaller homes (under 1,500 sq ft).

In a direct comparison in the same 1,200 sq ft apartment: 5GHz throughput at 15 feet: AX21 650 Mbps, RT-AX55 720 Mbps, both excellent 5GHz throughput at 50 feet through 2 walls: AX21 160 Mbps, RT-AX55 195 Mbps, marginal advantage to RT-AX55

Mesh: The Real Differentiator

The RT-AX55 supports AiMesh, you can add any compatible ASUS router as a second node and manage both from the same interface.

If you later need to extend coverage, you buy a second ASUS router rather than replacing everything.

The AX21 has no mesh capability.

App Quality

TP-Link Tether is simpler and more approachable.

ASUS's app is more feature-rich but more complex.

For users who want basic management, Tether wins.

The Verdict

Buy Archer AX21 if: small home or apartment, budget is tight, no plans to expand.

Buy RT-AX55 if: you may need to extend coverage later, you want AiProtection security features, or you are willing to pay a small premium for a more capable platform.