Email Suite
11 tools · Email authentication & deliverability
Audit and build the DNS records that decide whether your email is trusted — SPF, DKIM, DMARC, BIMI and MTA-STS — then score the whole posture.
39 tools · 3 suites · no sign-up
Free online tools that run in your browser
Email authentication checkers, link and URL inspectors, and date and age calculators. Nothing you enter is uploaded, logged or stored.
Three suites of tools
Each suite has its own hub, and each tool inside it has its own page.
Open Email
Link & URL
10 tools · Links, redirects & certificates
See where a link really goes before you click it: expand redirect chains, inspect certificates, check domain age and decode QR codes.
Calculators
18 tools · Dates, time, grades, trades & networks
Exact age and date arithmetic, timesheets and hours, GPA and course grades, concrete volumes, subnet maths and unit conversion — all in-browser.
Most used tools
A cross-section of the suites. Each link goes straight to that tool.
SPF Record CheckerAudit RFC 7208 SPF records, count DNS lookups against the 10-lookup quota and parse every mechanism and qualifier.AuthenticationDMARC Policy CheckerVerify your DMARC policy and alignment modes, and see exactly what receivers do with mail that fails.AuthenticationEmail Security ScoreOne 0-100 score and letter grade for a domain, combining SPF, DKIM, DMARC, BIMI and TLS in a single pass.DiagnosticsURL ScannerCheck any URL for lookalike domains, homograph tricks, odd entropy and known bad reputation before you open it.Threat DetectionSafe Link CheckerInspect a suspicious link, strip its tracking parameters and preview where it lands — without visiting it yourself.Threat DetectionRedirect CheckerExpand short links and follow every hop — 301, 302, 307, 308 and meta refresh — with loop detection and headers.DiagnosticsDomain Age CheckerQuery ICANN RDAP for a domain’s real registration date, registrar and age — brand-new domains are worth a second look.DiagnosticsSSL Certificate CheckerRead a live TLS handshake: issuer, subject alternative names, cipher suite and exactly how many days until expiry.InfrastructureAge CalculatorExact age in years, months and days plus total weeks, days, hours and minutes, next birthday countdown, day of the week you were born and leap days lived.Date & Time
How IncogSay works
The same four things are true of every tool on the site.
- 1Pick the tool you need
Every tool has its own page with its own inputs, results and explanation — no dashboard to learn and nothing bundled in that you did not ask for.
- 2Enter your input
A domain, a URL, a header dump, a date of birth. Nothing is pre-filled, and there is no sign-up, no email gate and no usage quota.
- 3Read the result
Results are shown in full with the reasoning behind them, so you can act on them or check them yourself rather than trusting a single verdict.
- 4Nothing is kept
Calculators run entirely in your browser. Tools that need a DNS or TLS lookup run at the edge in memory — no query logs, no accounts, no database.
39
free tools
0
accounts needed
0
rows stored
18
work fully offline
Frequently asked questions
What IncogSay is, what each suite covers, and what happens to your input.
QWhat is IncogSay?
IncogSay is a collection of free online tools grouped into suites. There are currently three: an Email Suite for email authentication records (SPF, DKIM, DMARC, BIMI, MTA-STS), a Link & URL suite for inspecting links, redirects, certificates and domain age, and a set of date and age calculators. Every tool has its own page and can be used on its own.
QIs IncogSay free, and do I need an account?
Every tool is free with no account, no email address and no usage limit. There is no paid tier, no trial and no feature held back behind a sign-up.
QDo you store what I enter?
No. The calculators run entirely in your browser, so the dates you type never leave the page. The tools that need a live DNS, RDAP or TLS lookup run at the edge and evaluate in memory — nothing is written to a database, no query log is kept and no IP address is retained.
QWhat does the Email Suite cover?
11 tools for the DNS records that decide whether your email is trusted: SPF (including the RFC 7208 10-lookup quota), DKIM keys by selector, DMARC policy and alignment, BIMI logos and Verified Mark Certificates, MTA-STS and TLS reporting, raw header analysis, and a single 0-100 score for a domain's overall posture. Each checker has a matching generator that builds the record for you.
QWhat does the Link & URL suite cover?
10 tools for working out where a link actually goes and whether the site behind it is what it claims: redirect chain expansion, URL and safe-link inspection, RDAP domain age, live TLS certificate details, QR code decoding and generation, password entropy, and an embeddable trust badge.
QWhat can the calculators do?
18 date and age calculators: exact age in years, months and days, age as of today or on any past or future date, chronological age for assessments and school cut-offs, baby age with corrected age for preterm births, and UPSC Civil Services age eligibility. They all share one arithmetic engine that counts whole days in UTC, so results do not shift with your timezone or daylight saving.
QHow accurate are the results?
The DNS, RDAP and TLS tools report what the live lookup returns at the moment you run it, with the raw record shown alongside the interpretation so you can verify it. The calculators use integer day arithmetic and the standard month-counting convention (the same one spreadsheets use for DATEDIF), so they agree with other correct implementations rather than approximating.
QDo the tools work on a phone?
Yes. Every page is responsive down to small screens, and the calculators work offline once the page has loaded because they do not make any network request.
QCan I use the results at work or in a report?
Yes, and that is the intended use for most of them. The email and link tools show the underlying record or response so you can paste the evidence into a ticket or report. For anything with legal or medical weight — eligibility rules, corrected age for a clinical decision — treat the output as a calculation and confirm it against the governing source.
QAre more tools coming?
Yes. The three current suites are the starting point, and new niches are added as complete sets rather than one-off pages, so each arrives with its own hub and its own tool pages.