Tandem vs BestInterest
BestInterest is an AI-focused co-parenting app for high-conflict situations, available in the US, Canada, the UK and Australia.
BestInterest costs see their site a year for two parents and has a free tier. Tandem costs $119.88 to $203.88 a year on yearly plans and includes agreement-linked requests, swaps, travel consent and blended-family support (checked October 2, 2026).
| Detail | Tandem | BestInterest |
|---|---|---|
| Both parents, per year | $119.88 to $203.88 | see their site |
| Billing | One price per family | Not published |
| Pricing detail | $9.99 to $16.99 a month on yearly plans; monthly from $12.99 | Free plan launched in January 2026 (messaging, AI coaching, journal, tasks). Premium is an optional subscription; its price isn't published in the announcement. |
| Free tier | No | Yes |
| Trial | 30 days, no card | Not listed |
Checked October 2, 2026. Source: BestInterest free plan announcement (Jan 2026). Competitor prices are as each company publishes them, and can change; check the source before deciding.
What BestInterest is known for
- AI message coaching
- Message Shield filter for toxic messages
- Solo mode for one parent
What Tandem adds
Built around your agreement
Upload the parenting plan once: Tandem reads the schedule, holidays and splits, and expense requests quote the exact clause that applies.
One price, both parents
One subscription covers both parents, from $9.99 a month on a yearly plan.
Swaps and make-up time
Trade days with make-up time offered; the calendar updates for both parents when it's accepted.
Travel consent, border-ready
Your co-parent reads and e-signs the letter in the app, the signed PDF is filed in your travel folder, and every letter is saved on your phone for the airport. Signing steps for every province and state, in English or French.
Blended families
Several families on one account, each kept separate. Partners, caregivers, teens and professionals see only what they should, and partners see the kids' details only with the other parent's agreement.
A calendar the kids can read
A printable, kid-friendly calendar of which home, switch days, holidays and trips, with nothing about money, messages or court.
Reminders from your agreement
Yearly deadlines and items that rotate between odd and even years reach the right parent ahead of time, and each one is logged when it's done.
Child support log
The paying parent records each payment and the other confirms it, so the balance is agreed.
Calm, documented messaging
Timestamped messages with first-viewed times, calmer rewrites and translation.
Questions
Is Tandem cheaper than BestInterest?
BestInterest costs see their site a year for two parents and has a free tier. Tandem costs $119.88 to $203.88 a year on yearly plans and includes agreement-linked requests, swaps, travel consent and blended-family support (checked October 2, 2026).
Does BestInterest charge each parent?
BestInterest doesn't publish whether its subscription covers one parent or both. Tandem charges one price for the whole family.
What is the difference between Tandem and BestInterest?
BestInterest is an AI-focused co-parenting app for high-conflict situations, available in the US, Canada, the UK and Australia. Tandem is built for co-parents: a calendar built from your parenting plan, expense requests that quote your agreement and need approval before payment, swaps, e-signed travel consent letters and a court-ready record.
Can I switch from BestInterest to Tandem?
Yes. Download your records from BestInterest as PDFs and add them to Tandem's Vault, then upload your parenting plan so Tandem builds your calendar. Your co-parent joins free with a six-letter code.