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by Osavus

For the love of coin collecting

Every piece
has a story.

The coin you found abroad. The note you inherited. The token you couldn’t leave behind.

Give them a home in Exergue. Keep the photographs, details and memories together in a collection that stays yours.

See Exergue in action

Coins, banknotes & tokens · Android · In development

Coins

The coin collection in Exergue, with pieces from Peru, India, Mexico, the United States, Australia and Egypt

Banknotes

Exergue collection showing a grid of banknote photographs with names, countries and dates
A richly illustrated French five-franc note from 1943
A place for every piece.Development preview · Sample collections · Photo credits

A catalogue for your collection.
A little care for everything in it.

Independently made
by Osavus, Estonia

01 / More than a catalogue number

The facts.
The find.
Your part of the story.

Two collectors can own the same issue. Only you know the story of your copy.

What you’ve discovered
Dates, references, condition and measurements. Start with what you know; add the details as you learn.
How it found you
The coin fair. The seller. The old receipt. Keep acquisition details and documents with the piece.
Why you kept it
Leave room for your observations and the memories that won’t appear in anyone else’s catalogue.
An Indian quarter-rupee record with its identity, year and an open grading control showing the collector’s selected condition and a plain-language explanation Exergue fields for acquisition, prior owner, receipts, notes and the personal story of a piece
The condition of your coin. The story only you can add.

02 / A closer relationship with your collection

Look closer.
There’s more to see.

Turn a coin over. Follow a detail in the engraving. Give a photograph a little more care. Then find the piece again with a word you remember.

01Both sides of the storyTurn, zoom and explore a coin. 02A photograph, consideredAdjust the light. Compare the detail. 03That piece you rememberFrom a word to the record.

Real app recordings · Silent · Play at your own pace

A photograph, consideredPreview a light adjustment and move the comparison divider. See the change before deciding what to keep.15 seconds · Development preview
The Calendars handbook showing date formats and the Ethiopian EE1936 to 1943–44 example
A little context can open up a whole collection.

03 / Made for the details collectors notice

Keep the date.
Understand the year.

A piece carries the calendar of its place and time. Preserve the year as struck, with its Gregorian context beside it.

Recorded dateEE1936Gregorian context1943–44

One example from the Ethiopian Era. The handbook explains the calendar behind the date.

Condition, with context.

Record your judgement of a piece’s condition, with plain-language grade explanations close at hand. The story of its wear belongs in the record, too.

04 / A collection with a future

You’re its keeper.
Keep it yours.

Your time. Your research.
Your collection to carry forward.

I.

A cabinet that makes sense to you.

Group by country, open an album or see what belongs in a particular tray. Give every piece a place, and spot the ones still waiting for a photograph.

II.

Close at hand. Even offline.

Your collection lives on your device. Browse, add, photograph and search without an account or an internet connection.

III.

More than a copy of an app.

Keep your records, photographs and documents together in a readable backup. Choose the folder, make a copy and check it against your collection.

A few things you might be wondering

Before you
open the cabinet.

Is Exergue for my kind of collection?

Exergue is being built for coins, banknotes, tokens and medals. Keep identity, physical details, condition, photographs and personal notes, with fields that fit the kind of object you collect.

Do I need a catalogue reference to begin?

No. Start with your own description and a photograph. You can add references, measurements, acquisition details and further research as you go.

Can I use it without an account?

Yes. The core collection, manual entry, photo tools, local search and handbooks work offline without an account. Optional catalogue connections are separate and require internet access.

Can I take my records with me?

The backup includes structured records, a CSV, photographs, documents and an explanation of the archive format. It is a file you can keep in a folder of your choice.

Can I download Exergue yet?

This is a preview of the Android app in development. A download link will be added here when the public release is available.

Taking shape at Osavus

For everything
you’re glad you kept.

In development for Android

Exergue is growing around the everyday work and quiet joy of collecting. We’d love to hear what you collect, and what you wish your catalogue could do.

Tell us about your collection

12 September 2026 development preview.
Sample records, grades, values and stories are illustrative.

Photography & credits