Guide #01
Step-up SIP vs Regular SIP
When annual SIP increases beat a flat SIP — salary growth, contribution habit, and how to model both on Tools.Town.
sipstep-upmutual fund
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Glossaries, decision notes and checklists that stay useful long after a product tutorial goes stale.
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Guide #02
Email Sending Cost Checklist Before You Pick an ESP
A short checklist before you commit to SES, Cloudflare Email Sending, Resend, SendGrid, Postmark, or Mailgun — volume, recipients vs messages, floors, and gotchas.
email checklistchoose an esptransactional email
Read the guide Guide #03
Per-Thousand vs Plan-Floor Email Pricing
Why a $0.90/1k overage is not the price of 10,000 emails, and how Tools.Town picks the cheapest SKU that can actually send the volume.
email plan flooroveragecost per 1000 emails
Read the guide Guide #04
Transactional vs Marketing Email Pricing
Why Tools.Town’s email cost calculators model API sends and plan floors — not Mailchimp or Klaviyo contact pricing — and when each model applies.
transactional vs marketing emailesp pricingcontacts vs sends
Read the guide Guide #05
Flat-Rate vs Reducing-Balance Interest
Why flat-rate interest quotes look cheaper than reducing-balance EMI — and how to compare loans fairly before you visit the bank.
emiflat ratereducing balance
Read the guide Guide #06
GST Inclusive vs Exclusive Pricing
Understand GST-inclusive vs exclusive quotes, how to add or remove tax, and when CGST/SGST vs IGST applies — with Tools.Town GST Calculator.
gstinclusiveexclusive
Read the guide Guide #07
Percentage Change vs Percentage Difference vs Percentage Points
Learn which percentage formula to use for before-and-after values, peer comparisons, survey results, rates, discounts, and growth.
percentage changepercentage differencepercentage points
Read the guide Guide #08
Old vs New Tax Regime Checklist (India)
FY 2025-26 checklist to compare old vs new income-tax regimes — deductions, 87A rebate, and when to run both in the Income Tax Calculator.
income taxold regimenew regime
Read the guide Guide #09
SIP vs Lumpsum Basics
When monthly SIP beats a one-time lumpsum (and vice versa) — cash timing, rupee-cost averaging, and how to model both on Tools.Town.
siplumpsummutual fund
Read the guide Guide #10
Calendar Days vs Business Days: Deadlines Explained
Calculate deadlines correctly by distinguishing calendar days, weekdays, business days, holidays, inclusive counts, and start-date rules.
calendar daysbusiness daysworking days
Read the guide Guide #11
Elapsed Time vs Clock Duration vs Date Difference
Choose the right calculator for timesheets, overnight shifts, calendar intervals, and date arithmetic — elapsed time, clock duration, and date difference explained.
elapsed timeclock durationdate difference
Read the guide Guide #12
ISO 8601 vs Unix Timestamps: Which Format to Use
Compare ISO 8601 strings and Unix epoch timestamps for APIs, logs, databases, and UI. Seconds vs milliseconds, UTC offsets, and when each format wins.
ISO 8601Unix timestampepoch
Read the guide Guide #13
Timezone vs UTC vs Local Time
How wall clocks, UTC, and IANA timezones differ — DST pitfalls and when to use Timezone Converter for remote meetings.
timezoneutclocal time
Read the guide Guide #14
QR Code Size and Error Correction: A Practical Guide
Choose the right QR code dimensions, quiet zone, and error-correction level for screens, labels, posters, packaging, and logo overlays.
qr codeerror correctionqr code size
Read the guide Guide #15
India Government PDF Size Limits Checklist
Checklist of common Indian portal PDF upload caps — MahaDBT 15–256 KB, Aaple Sarkar ≤500 KB, and other 75–1000 KB bands — plus how to compress safely.
pdf sizemahadbtaaple sarkar
Read the guide Guide #16
India Passport & Exam Photo Size Checklist
Checklist of common Indian passport, visa, MahaDBT, MPSC, SSC, and UPSC photo pixel and KB rules — verify live portal limits before upload.
passport photoexam photomahadbt
Read the guide Guide #17
PAN vs Aadhaar vs GSTIN — What Each ID Is For
India ID glossary: PAN for tax, Aadhaar for identity (format-only checks here), GSTIN for GST — never mix their jobs or claim government verification.
panaadhaargstin
Read the guide Guide #18
Hashing vs Encryption for Beginners
Hashing is one-way fingerprinting; encryption is reversible with a key — when to use SHA-256 checksums vs encrypting data, and why MD5 isn’t for passwords.
hashingencryptionsha-256
Read the guide Guide #19
JWT vs Session Cookies
When to use JSON Web Tokens versus session cookies for auth — trade-offs for SPAs, APIs, CSRF, revocation, and mobile clients.
jwtsessioncookies
Read the guide Guide #20
Password Entropy vs Length vs Diceware
How bits of entropy, character length, and Diceware word count relate — pick a generator strategy that matches memory vs autofill.
entropypassworddiceware
Read the guide Guide #21
Meta Description Length by SERP
Aim for ~150–160 characters / ~920px on desktop — why Google truncates by pixels, how mobile differs, and how to preview before publish.
meta descriptionserpseo
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Open Graph Image Size, Aspect Ratio, and Safe Zones
Design social share images that survive Facebook, LinkedIn, X, Slack, and chat-app crops using practical dimensions and safe zones.
open graphog imagesocial sharing
Read the guide Guide #23
Schema JSON-LD Starter for a Blog Post
Minimal Article + optional FAQPage JSON-LD checklist — generate with Schema Markup Generator and validate before you ship.
schemajson-ldarticle
Read the guide Guide #24
UTM Parameters vs Canonical vs OG URL
Keep campaign UTMs, rel=canonical, and og:url from fighting each other — when each belongs on a page and how to avoid duplicate tracking URLs.
utmcanonicalog:url
Read the guide Guide #25
Ascending vs Descending Order
Ascending means smallest or A first; descending means largest or Z first. How to toggle both on Tools.Town list tools.
ascendingdescendingglossary
Read the guide Guide #26
Case-Sensitive vs Case-Insensitive Dedupe
When Apple and apple should count as duplicates — and when they must stay separate. Tools.Town dedupe toggles explained.
dedupecaseglossary
Read the guide Guide #27
List Cleanup Checklist Before Import
Trim, find duplicates, dedupe, sort, and split — a practical checklist before importing emails, keywords, or IDs.
checklistdedupelist
Read the guide Guide #28
What Is Natural Sort Order?
Natural sort puts item2 before item10 by understanding numbers inside strings — unlike plain alphabetical sort.
natural sortglossarysort
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