Add an expense with the receipt, the co-parent approves, history cannot be rewritten. On record if you ever need it.
Shared kid expenses with approvals and audit trail. Add an expense, the other parent approves or disputes it, the running balance updates. Receipts attached, history preserved, exportable for a lawyer or court.
Who paid for the after-school club? How much was the doctor visit? Who bought the winter shoes? Duo records all of it — neutrally, with proof.
Built for separated and divorced parents. Also works for any two people sharing costs who need transparent evidence — not negotiation.
WHAT DUO DOES
— Add an expense — amount, category (school, doctor, clothes, food, activities…), date, ratio (default 50/50)
— Receipt required — every expense needs at least one photo or PDF, immutable
— Approval workflow — the other parent approves, disputes, or auto-approves after a set delay
— Disputes — raise a written reason, expense stays in the record (no deletions)
— Running balance — only approved expenses count; settled balance subtracts confirmed settlements
— Settlement evidence — one parent proposes, the other confirms; the actual payment happens outside the app
— Per-case ratios — different cases can have different splits (e.g., 60/40 for one child, 50/50 for another)
— One subscription covers both parents in a shared case
PRIVACY
— Email login with a one-time code — no password to remember.
— No third-party tracking. No ads. No personal analytics.
— Documents and expenses are private — visible only to the two parents in the case.
FREE AND PREMIUM
Free:
— full evidence workflow (cases, expenses, approvals, disputes, settlements, documents)
— history of the last 2 months
— manual expense entry
Premium (Duo Plus):
— full history, no time limit
— PDF and CSV export — documentation for a lawyer or court
— statistics — totals by category, month, parent
— audit trail — complete event history of every case
— push and email notifications when the other parent adds an expense
— AI auto-fill from a PDF receipt (free tier: 10 uses lifetime)
Privacy Policy: https://1tnt.link/duo/privacy.html
Terms of Use (EULA): https://1tnt.link/duo/eula.html
Ratings & Reviews
5.0
out of 5
1 Ratings
Reliable sharing
Sharing the ZIP package, PDF report, CSV export and receipt photos works again, including on the latest system versions.
You approve what you see
If the other parent changed an expense in the meantime, the app lets you know and loads its current version before you approve it.
Receipt in another currency
When a receipt is in a different currency than the case, the amount is not pre-filled and the app points out the difference.
A complete package for your lawyer or the court
Every receipt in the ZIP package is checked against its checksum, and the manifest shows for each file whether it is intact. An incomplete package is clearly marked.
Your records stay complete
If the other parent deletes their account, the shared case stays complete for you — expenses, receipts, approvals and settlements — and you can still view and export it.
Fixes
The automatic approval period now runs from the last change to an expense. If data cannot be refreshed, the app clearly says so. Sync is reliable even with a long expense history.
Version 1.6.1
The developer, BROKEN MATRIX TECHNOLOGY, LLC, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
Contact Info
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More