TasseraNL
Independent software · Netherlands

Four products, each doing one job well.

Tassera is a small software company. We build and run our own web products, and we build custom software for people and companies who need something that does not exist yet.

See the products → Start a project
Fig. 01 · Select a tile
Products live
4
Custom projects
Open for new work
Based in
NL Netherlands
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0
02 / Products

What we run

Each product has its own domain, its own users and its own roadmap. All four are live today.

T-01 Live

Longest Match

IP address lookup and network intelligence. Location, network, operator, registered holder and VPN or proxy signals for any address, on the web and through an API.

Domain
longestmatch.com
For
Developers, fraud and security teams
Stack
FastAPI · PostgreSQL · React
T-02 Live

JourneyComposer

Trip planning from first idea to departure. Autocompose a day-by-day trip from open travel guides, or build it yourself with stops, scenic roads, transport, costs and packing lists.

Domain
journeycomposer.com
For
Travellers and travel groups
Stack
Next.js · PostgreSQL · MapLibre
T-03 Live

Dashly

A personal start page. Bookmarks, notes, to-dos, weather, calendars, newsfeeds and habits on one dashboard you arrange yourself and can share with a link.

Domain
dashly.live
For
Anyone who starts the day in a browser
Stack
Flask · PostgreSQL · plain JS
T-04 Live

Triage Aid

An end-to-end encrypted notebook for triaging security incidents from any SIEM. Notes are encrypted in the browser, and the server stores ciphertext only.

Domain
triage.spijkerman.xyz
For
SOC analysts and incident responders
Stack
SvelteKit · SQLite · Web Crypto
03 / Custom work

We build for other companies too

Need software that does not exist yet? Tassera takes on custom projects for people and companies, built and run the same way as our own products.

  • 01
    Web applications. Multi-user apps with accounts, roles, subscriptions and live collaboration, from the first version to production.
  • 02
    APIs and data pipelines. Take in large datasets, keep them current on a schedule, and serve them fast through a documented, versioned API.
  • 03
    Privacy and security tools. Software for sensitive data: encryption in the browser, two-factor login, recovery flows and audit trails.
  • 04
    Dashboards and internal tools. Admin panels, dashboards and internal tools that bring data from the services you already use into one place.
Describe your project → How it works
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04 / How we work

Three habits behind every product

01

Built on open data

Longest Match answers every lookup from its own copy of public registry, routing and geolocation data. JourneyComposer composes trips from Wikivoyage, Wikidata and OpenStreetMap.

MeasuredThird-party API calls per Longest Match lookup: 0
02

Private by default

Triage Aid encrypts notes in the browser before they are stored. JourneyComposer strips metadata from uploaded photo files and lets every account export its data. This website sets no cookies.

MeasuredReadable notes on the Triage Aid server: 0
03

Numbers you can check

Longest Match states the coverage behind its figures and keeps a public, versioned API changelog. When the data is thin, the page says so.

MeasuredAPI releases in August 2026: 8
05 / Recent work

What got better lately

A selection of the improvements that went live across the products in 2026.

  • Longest MatchCheck up to 100 addresses in a single request with batch lookups
  • Longest MatchSign up and get an API key straight away
  • Longest MatchMore reliable city locations: a city is shown only when two independent sources agree
  • JourneyComposerPublic trip guides you can read and copy into your own plan
  • JourneyComposerShape a generated trip: fixed start and end, round trips, minimum nights, transport mode
  • Triage AidA browser extension that runs IP reputation lookups from your own browser session

  • DashlyGive every widget its own colour

  • DashlyCalendars from any ICS feed, right on your dashboard
06 / Contact
[email protected]
Other ways to reach us

A project you want built, a question about one of the products, or a bug you found. If it is about one product, name it in the subject.