PlainAstro vs Age by Serial Number

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

PlainAstro compared with Age by Serial Number
Detail	PlainAstro	Age by Serial Number
What it does	Free birth chart calculator and astrology explained in plain words	Find how old a water heater, furnace or air conditioner is from its serial number
Stage	Not given	Not given
Founded	Not given	Not given
Based in	GB	Not given
Pricing model	Freemium	Free
Pricing	Free birth chart calculator with no sign-up required. Full birth chart reading: $12. Personal 2027 astro calendar: $15.	Not given
Key features	Accurate planetary positions checked against Swiss Ephemeris within an arc-minute 34,000 birth places with historical time zones Big Three calculator for Sun, Moon and rising signs Rising sign calculator with planetary house system Saturn return calculator Black Moon Lilith calculator Nakshatra calculator for Vedic astrology 2027 sky forecast with Mercury retrograde and eclipse dates All 12 houses explanations Free weekly astrology email by Sun sign	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
What makes it different	No jargon or mystical fog Honest explanations without flattery Verified against Swiss Ephemeris for accuracy Everyday examples in plain language No sign-up required for basic calculator	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
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)	40 +3 (up) since last check	1 no change since last check
Trust Flow (Majestic)	1	1
Citation Flow (Majestic)	17	17
Referring domains (Majestic)	5	4

4 details filled in for both companies.

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