Age by Serial Number vs GMXS

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

Age by Serial Number compared with GMXS
Detail	Age by Serial Number	GMXS
What it does	Find how old a water heater, furnace or air conditioner is from its serial number	Free URL shortener with custom short links, no sign-up needed
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	Not given
Pricing model	Free	Freemium
Pricing	Not given	Free account: 100 saved links and 30 new links per calendar month. Up to 10 links per day without an account.
Key features	Water heater serial number decoders for Bradford White, A.O. Smith, State, American, Whirlpool, Rheem, Ruud, Lochinvar Furnace and air conditioner decoders for Goodman, Amana, Lennox, Carrier, Trane, American Standard Water heater and furnace error code lookups Water heater sizing calculator for tank and tankless models Rheem water heater status light meanings Goodman furnace LED flash code reference Rinnai V53De tankless water heater code lookup Rheem tankless water heater code lookup	Custom short link aliases Link expiry dates up to 365 days Edit or pause links Private click counts No sign-up needed for basic use Update destination from dashboard 4 to 16 character custom aliases
What makes it different	Independent reference not affiliated with or endorsed by any manufacturer Distinguishes manufacture date from installation date and emphasizes condition and maintenance over age Covers safety guidance including gas smell warnings and professional contractor recommendations	No credit card required Private analytics without storing visitor IP addresses No account needed for up to 10 links a day Full control after sharing links
Free plan	Not given	Not given
Open source	Not given	Not given
Platforms	Not given	Not given
Public API	Not given	Not given
Community votes	0	0
DR (Domain Rating by Ahrefs)	1 no change since last check	2 no change since last check
Trust Flow (Majestic)	1	0
Citation Flow (Majestic)	17	0
Referring domains (Majestic)	4	1

4 details filled in for both companies.

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