Independent software studio · Amsterdam

Software
for what is
yours.

Independent software for files, mail and money — useful first, honest throughout.

Explore the products
  1. 01gooi.io.files
  2. 02Jaymail.mail
  3. 03Pertalo.money
  4. 04Mailbarn.hosting

01 / files · live

Send it.
Keep it private.

Zero-knowledge encrypted file transfer up to 5 GB. Encryption starts in your browser, and no account is required.

  • AES-256-GCM
  • ≤ 5 GB
  • no account
Open gooi.io
Gooi encrypted file-transfer dropzoneENCRYPTED / BEFORE UPLOAD
Jaymail.
INTERFACE PREVIEW
＋ ComposeInboxStarredSentArchive JMAP CONNECTED
INBOX

Good morning.

Search mail
  1. CCarol de GrootProject kickoffThe first notes are ready for you.
  2. JWJMAP WeeklyA quieter inboxPush-first mail, without the noise.
  3. BBob de VriesWeekend plansSunday works perfectly for us.

02 / mail · early access

Your mailbox,
calmer.

Mail, calendar and contacts across web, iOS and native Android, built around the open JMAP standard.

web · iOS · Android

  • JMAP-native
  • tracker-free
  • one calm workspace
Explore Jaymail

03 / money · private alpha

See what changed.
Know why.

A portfolio tracker that connects positions, cashflows, costs and market movement into one auditable story.

  • period stories
  • cashflows traced
  • results explained
Ask about Pertalo
Pertalo.
INTERFACE PREVIEW
WAARDOOR VERANDERDE HET?

Beleggingsresultaat

Dezelfde periode als de grafiek hierboven.

1 JAAR
Begin••••beginwaarde
Geld in/uit posities••••aan- en verkopen samen
Koers & valuta••••open én verkocht samen
Eind••••eindwaarde

beginwaarde + geld in/uit posities + marktresultaat = eindwaarde

Databarn glass floor showing the cabling beneath

04 / hosting · private pilot

Email hosting,
properly tended.

Managed email hosting for one to five mailboxes on your own domain, with Jaymail included and other clients welcome.

  • your domain
  • 1–5 mailboxes
  • managed in Amsterdam
Visit Mailbarn

The studio / Amsterdam

Different products.
One stubborn standard.

Designed, built and operated here. Independent software studio in Amsterdam — from interface to infrastructure.

01

Useful before impressive

The product has to earn its place in a real day before it earns decoration.

02

Explain the difficult parts

Privacy, money and infrastructure become stronger when their workings stay visible.

03

Built to be kept

Open standards, quiet interfaces and boring reliability outlast a launch cycle.

Handy tools. Honest engineering.

Workbench / current

Now shipping.

Four products, one live rhythm. Only work that can be pointed at.

01

Jaymail.

mail

Native Android v1 is complete; store release is next.

02

Pertalo.

money

Portfolio periods now explain their result.

03

Mailbarn.

hosting

Private pilot in preparation.

04

gooi.io.

files

Encrypted transfers recover automatically after an interruption.