Technology · Secure Email
1,043 websites in the live index use TOPSEC as of October 2026. Download the full list of TOPSEC websites with website, company, country and language.
SourceAs of October 28, 2026, TechLeads detects TOPSEC on 1,043 websites: 0.59% of Secure Email detections, the 15th most-used of 67 Secure Email technologies we track.
Sample results for TOPSEC. Description is shown under each title.
| Rank | Website | Title · Description | Company | Country | Language |
|---|---|---|---|---|---|
| #18,569 | teagasc.ie | Home - Teagasc | Agriculture and Food Development Authority | - | - | - |
| #172,940 | hughlane.ie | Homepage - Hugh Lane Gallery - DublinHugh Lane Gallery holds an extraordinary collection of modern and contemporary art, brought to view in temporary and permanent exhibitions and installations. | Hugh Lane | GB | en-GB |
| #252,087 | waterfordcouncil.ie | Waterford City & County Council - HomeWaterford City & County Council are the authority responsible for local government administration in the City & County of Waterford, Ireland. | - | - | - |
| #254,287 | irishlights.ie | HomeWe are a maritime organisation delivering an essential safety service around the coast of Ireland, protecting the marine environment, and supporting the marine industry and coastal communities. | Irishlights | IE | en |
| #299,540 | kilkennycoco.ie | Carlow Kilkenny Dog Shelter - Kilkenny County Council | - | - | - |
| #317,445 | donegal.ie | EN | Donegal County Council. | Donegal County Council | - | - |
| #324,619 | cro.ie | Home - CRO | - | - | - |
| #334,996 | blakefriedmann.co.uk | Blake FriedmannLondon literary agency representing authors and scriptwriters for film, TV and stage | Blake Friedmann | GB | en-GB |
| #346,830 | iaba.ie | Irish Athletic Boxing Association - | Irish Athletic Boxing Association | - | - |
| #499,177 | workplacerelations.ie | Home - Workplace Relations Commission | - | - | - |
| #499,478 | buteykoclinic.com | The International Leading Authority on The Buteyko Breathing Method – Buteyko Clinic InternationalUnlock the power of optimal breathing to enhance your physical and mental well-being. Join the global community benefiting from our proven Buteyko breathing techniques. | Buteyko Clinic International | - | - |
| #502,866 | fenland.gov.uk | Fenland District Council Home Page - Fenland District Council | Fenland District Council | GB | en |
| #535,919 | tipperarycoco.ie | Your Carrick-on-Suir | Tipperary County Council | - | - | - |
| #643,627 | bundoransurfco.com | Bundoran Surf co – Surf and stay, surf lessons, rentals, events, accomodation | Bundoransurfco | US | en |
| #660,703 | businessandfinance.com | Business & Finance | Ireland's leading business media groupA proud six decade track record delivering insightful news, comment and analysis to and about the Irish and international business community. | Business & Finance | - | - |
| #661,799 | jerseypost.com | Postal authority - Jersey PostJersey Post is the island of Jersey's trusted letter and parcel delivery service. | - | - | en |
| #772,649 | fotahouse.com | Fota House, Arboretum & Gardens | CorkVisit Fota House and take a guided tour, explore the historic gardens, parklands and surroundings on Fota Island, Cork | Fota House, Arboretum & Gardens | GB | en-GB |
| #806,691 | bishopafc.com | Bishop Auckland FC – Bishop Auckland FC | - | - | - |
| #1,000,000 | kartelluk.com | Bathroom Suites and Radiators | Kartell UKKartell UK has established a reputation as a premier supplier of high quality products to the UK plumbing and heating sector. | - | - | - |
| #1,220,955 | garlanna.com | Greeting Cards & Gifts Ireland - Garlanna Greeting CardsAt Garlanna Greeting Cards Ireland, we design & produce Irish greeting cards, gift wrap, and accessories. Birthdays, Weddings, Christmas and important moments. | - | - | - |
| #1,773,848 | greatwesternairambulance.com | Great Western Air Ambulance CharityGreat Western Air Ambulance Charity provide the air ambulance and critical care service across Gloucestershire, South Gloucestershire, Bath & North east Somerset, Bristol, Somerset and parts of Wiltshire. | Great Western Air Ambulance Charity | - | - |
| #2,914,992 | berkeleylife.com | Berkeley Life - Nitric Oxide Foundation | - | - | - |
| #5,000,000 | emthealthcare.co.uk | Welcome to EMT Healthcare LtdEMT Healthcare Ltd is the UK's leading wholesaler for every dispensing need for pharmacies across the UK. Established in 1963 EMT's main focus is to deliver excellence by providing high quality products with outstanding value and service. | - | - | - |
| #6,407,490 | daisyhouse.org | Daisyhouse Association - Helping Women Out Of HomelessnessDaisyhouse Association - Daisyhouse provides secure affordable high quality supported accommodation to homeless women in Ireland | - | - | - |
| #9,416,910 | timbernsw.com.au | Home - Timber NSWSee what we’re up to on Facebook… Timber NSW | - | - | - |
Complete TOPSEC website dataset in CSV. One-time purchase.
TOPSEC dataset · CSV
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The most-used Secure Email technologies in the TechLeads index, by number of websites. TOPSEC accounts for 0.59% of Secure Email detections (1,043 websites).
| No. | Technology | Websites | Share of Secure Email | Relative size |
|---|---|---|---|---|
| 01 | Proton Mail | 114,899 | 65.0% | |
| 02 | CDNS Network | 8,641 | 4.9% | |
| 03 | MailInBlack | 8,618 | 4.9% | |
| 04 | Sophos | 8,476 | 4.8% | |
| 05 | Hushmail | 4,381 | 2.5% | |
| 06 | Skymail | 4,289 |
TechLeads scans public websites and identifies TOPSEC from signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Website counts refresh daily; this page uses data from October 28, 2026. Counts only include websites we have scanned, so they can differ from other providers.
The TechLeads live index currently lists 1,043 websites using TOPSEC. Open the sample table on this page or download the lead list.
TOPSEC is not in the HTTP Archive history extract (about 4,000 names). The live TechLeads catalog still tracks it among 12,000+ technologies.
See related technologies and co-occurrence on this page. Historical competitor charts appear when HTTP Archive covers TOPSEC.
Companies and websites using TOPSEC in the TechLeads index include teagasc.ie, hughlane.ie, waterfordcouncil.ie, irishlights.ie, kilkennycoco.ie. The full list of 1,043 websites, with company name, country and language, is available as a CSV export.
By number of websites in the TechLeads index, the most-used Secure Email alternatives to TOPSEC are Proton Mail (114,899), CDNS Network (8,641), MailInBlack (8,618).
TechLeads scans public websites and matches TOPSEC by signals in the page HTML, scripts, cookies, HTTP headers and DNS records. Website counts refresh daily.
| 2.4% |
| 07 | Migadu | 3,694 | 2.1% |
|---|
| 08 | Securence | 2,597 | 1.5% |
|---|
| 09 | SpamTitan | 2,551 | 1.4% |
|---|
| 10 | MailGuard | 2,525 | 1.4% |
|---|
Yes. A one-time TOPSEC dataset is $29 as a CSV. The Growth plan ($79/mo) covers 10 technologies with recurring exports, alerts and API access.
Top-ranked sites on TOPSECRank
Technologies most frequently detected on the same websites as TOPSEC. Counts are websites in the live index.
Sites where we first detected TOPSEC, by week (UTC, weeks start Monday). These are newly detected sites, and the counts follow our discovery coverage.
53
sites newly detected in the last 12 weeks
Email security provider.
Our comprehensive database contains 1,043 websites using TOPSEC, making it the most complete TOPSEC sites list available. This TOPSEC customer websites directory helps businesses detect websites using TOPSEC and identify potential leads.
Websites using TOPSEC commonly also use Haravan, Zendesk, Office 365 Mail, jQuery, Modernizr — reflecting typical TOPSEC technology stacks.
Our TOPSEC technology detection system scans millions of websites to identify those powered by TOPSEC. This list of sites with TOPSEC includes detailed information such as company names, contact details, social media profiles, and website rankings. Whether you're looking for top websites with TOPSEC or exploring TOPSEC adoption trends, our database provides comprehensive insights.
Each entry in our TOPSEC sites list includes valuable data points: domain name, global ranking, company information, contact details, social media links. This makes it easy to detect websites using TOPSEC and reach out to potential customers or partners.
Get instant access to the full list of sites with TOPSEC in CSV format. Our dataset includes all 1,043 TOPSEC customer websites with complete contact information, perfect for lead generation, market research, and competitive analysis. The data is regularly updated to ensure accuracy and includes the latest TOPSEC powered websites.
