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Age by Serial Number vs Invisible Character

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 Invisible Character
DetailAge by Serial Number logo Age by Serial Number Invisible Character
What it doesFind how old a water heater, furnace or air conditioner is from its serial number Copy and paste invisible Unicode characters and blank text instantly for usernames, messages, and formatting
StageNot given Not given
FoundedNot given Not given
Based inNot given Not given
Pricing modelFree Freemium
PricingNot given Free plan with 3,000 AI Words per month; Pro plan at $8.58/month ($102.99 yearly, save 49%) with 120,000 AI Words per month; Max plan at $16.17/month ($193.99 yearly, save 51%) with 360,000 AI Words per month. Additional AI Words packs: Boost (30,000 words for $6.49), Creator (100,000 words for $18.
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
  • One-click copy for Hangul Filler, Braille Blank, Zero Width Space, and Non-Breaking Space
  • Generate 1 to 10,000 copies of invisible characters
  • AI paraphraser with multiple tones (Standard, Fluency, Formal, Creative)
  • AI text humanizer to make robotic writing sound natural
  • AI summarizer with bullet and TL;DR modes
  • Comprehensive Unicode whitespace matrix with HTML entities
  • 100% client-side processing with no data logging
  • Private workspace with cloud history and document storage
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
  • 100% client-side, browser-native execution with no data logging or account required
  • Strict Unicode standard compliance for maximum reliability across platforms
  • Tested across mainstream platforms including Discord, WhatsApp, Steam, and Roblox
Free planNot given Not given
Open sourceNot given Not given
PlatformsNot given Not given
Public APINot given Not given
Community votes00
DR (Domain Rating by Ahrefs)1 no change since last check1 no change since last check
Trust Flow (Majestic)11
Citation Flow (Majestic)1725
Referring domains (Majestic)432

4 details filled in for both companies.

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