Independent software studio

Software
for what is
yours.

Files, mail and money. Independent tools, built with care in Amsterdam.

Explore the products
  1. 01gooi.io.files
  2. 02Jaymail.mail
  3. 03Pertalo.investing
  4. 04moneybarn.bookkeeping
  5. 05Mailbarn.hosting

01 / files

gooi.io.

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

Ready to use · no account

Gooi encrypted file-transfer dropzoneEncrypted before it leaves your browser.

02 / mail

Jaymail.

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

Early access

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.

03 / investing

Pertalo.

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

Private alpha · enquire

Actual Pertalo portfolio interface with a value chart and period explanation, using fictional demo data.
Actual interface · DEMO DATAView full size ↗

04 / bookkeeping

moneybarn.

Your books. Your server.

Self-hosted bookkeeping for Dutch businesses: invoices, purchases, bank and VAT, backed by a real double-entry ledger.

  • Moneybird-compatible API
  • double-entry ledger
  • Dutch VAT
Ask about Moneybarn

Private deployment · enquire

Already using it? Sign in ↗
Actual Moneybarn overview with revenue, bank, tasks and VAT for the fictional demo company Demo B.V.
Actual interface · DEMO DATAView full size ↗
Databarn glass floor showing the cabling beneath

05 / hosting

Mailbarn.

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

Private pilot

The studio / Amsterdam

From the first pixel
to the last packet.

Independent software, made in Amsterdam. We design the interfaces, write the software and operate the services — with our own Databarn infrastructure behind Gooi and Mailbarn.

01

Privacy in the product

Gooi encrypts files before upload. Jaymail keeps tracking out of your inbox.

Files & mail
02

Numbers you can follow

Pertalo explains what changed. Moneybarn keeps the books connected to a double-entry ledger.

Investing & bookkeeping

Handy tools. Honest engineering.

Workbench / current

Now shipping.

Small tools. Ongoing work.

01

moneybarn.

bookkeeping

Moneybird migrations now verify totals and ledger balances before the switch.

02

Jaymail.

mail

Native Android v1 is complete; store release is next.

03

Pertalo.

investing

Portfolio periods now explain their result.

04

Mailbarn.

hosting

Private pilot in preparation.

05

gooi.io.

files

Encrypted transfers recover automatically after an interruption.