1000x an idea

Shared budgets: the 1000x version and what we build first

To: Ruth | From: PM, Pocketbook

Recommendation

Commit next quarter, but frame the work as a growth loop, not a feature. The loop is the product's invite funnel, and today it is nearly empty. The larger vision is a plausible direction, not a forecast.

The 1000x version

Pocketbook becomes where households make money decisions together, not a tool one person uses to watch their own spending.

Most financial decisions are made by more than one person: rent, holidays, supporting a parent, a teenager's first card. Today those decisions happen in texts, arguments, and spreadsheets. The ambitious version is the shared layer for that: shared budgets, shared goals, bills and "who's paying" coordination, and the conversation about money attached to the transactions themselves. Couples are the wedge. Households of three or more, such as families, adult children supporting parents, and roommates, are the expansion. Each household brings 2–4 people into the product, and every one of them is a potential Premium payer.

The mechanism

The mechanism is a two-sided engagement loop that doubles as an acquisition channel:

1. A shared budget requires a second person, so every one is an invite.
2. Once shared, each person's spending gives the other a reason to open the app. Most couple sessions start from a notification like "Alex spent $48 at the grocery store." Couples open the app 11 days a month versus 4 for solo users.
3. That activity triggers conversation. 41% of couples add a "money talk" note in month one, even though we built that feature as an afterthought.
4. Households grow. 16% of couples add a third person within a year.

A solo budgeter has to supply their own discipline every day. A shared budgeter gets reminded by someone they care about, and that is a much sturdier retention engine.

What the data says, and what it doesn't

• Shared users are about 14% of users but roughly 45% of Premium payers (about 5,900 of 13,200 by my arithmetic).
• The bottleneck is the invite funnel. Only 3% of solo users invite anyone, and only 22% of invitees join. That is about 0.7% of solo users becoming a shared pair. The "100%" invite and join figures for shared groups are true by definition, because those groups are defined by having shared. They are not evidence of a good funnel.
• This is correlation. People who share a budget with a partner are probably already more motivated and more financially aligned. Some of the 58% vs 17% gap is selection, not effect. I don't know how much, and the first experiment is designed to find out.
• Context matters. Invites started from a shared-expense moment (rent, a holiday) retain best. That suggests where to put the invite prompt.

Illustrative upside, not a forecast: if we lifted solo invite rate from 3% to 10% and join rate from 22% to 40%, we would create about 7,300 shared pairs from today's solo base, against roughly 1,200 on current rates. Even if the new pairs retain and convert at only half the gap shown above, that is material. The real rates will probably be lower because the early inviters are our most motivated users.

What we build first (next quarter)

Scope is deliberately narrow: make the existing behavior easy to start and worth returning to.

1. Invite at the shared-expense moment. Detect rent, large recurring bills, and trip or holiday spending, and prompt "Split this budget with someone?" with a one-tap invite link.
2. Make the invitee's first minute good. They land inside a populated budget, not an empty onboarding flow. This targets the 22% join rate.
3. Partner activity notifications, with user controls. Keep what works and add mute and privacy settings, because "watching your partner's spending" can feel like surveillance.
4. Promote "money talk" to threaded comments on transactions. Don't expand beyond that yet.
5. A frictionless "add a third person" path to test the household expansion.

Not building yet: payments or transfers, kids' accounts, roommate bill-splitting, and advisor features. These are the 1000x roadmap and should be earned by the first results.

How we'll know it's working

Primary metric: share of solo users who form a shared budget where both people are active weekly at week 8. Baseline is about 0.7% formed, and I will need to establish the "both active" baseline.

The causal test: run the invite prompt as a randomized experiment, with a holdout of solo users who never see it. Compare 6-month retention and Premium conversion across the whole exposed group versus the holdout, not just those who accepted. This separates real lift from selection. Since 6-month retention is slow, use 8-week retention and Premium conversion as leading indicators and confirm at 6 months.

Supporting metrics: - Solo invite rate (3% baseline) and invitee join rate (22% baseline) - Retention and Premium conversion of newly formed pairs versus matched solo users - Third-person add rate (16% baseline over a year) - Notification mute and opt-out rate, as a guardrail on the surveillance risk

Decision rules at end of quarter: - Invite rate and join rate both move meaningfully, and the exposed group beats the holdout on 8-week retention: expand toward households and the broader vision. - Invites rise but newly formed pairs retain no better than matched solo users: the existing 58% was mostly selection, and we stop treating this as a growth engine. - Join rate stays near 22%: the problem is invitee experience or relevance, so we fix that before building more.

Open questions

• The data shows people already sharing budgets. Before kickoff I need to confirm exactly what sharing exists today and how those 28,500 users do it, since the answer changes the scope.
• Do shared budgets cannibalize Premium seats? Does one Premium subscription cover both people? Pricing needs a decision.
• Sensitive cases (separated couples, financial control in abusive relationships) need design review before we push invites harder.

I'd like a go on the first-quarter scope and the holdout experiment design.

Memo: Shared budgets, the 1000x version

To: Ruth | From: Product | Re: Ana's shared-budgets proposal

The short version

The big opportunity isn't a "share a budget" setting. It's turning Pocketbook from a tool one person uses alone into the place a household runs its money and talks about it. Our current users already show this. People who share a budget are 14% of our users. They account for about 36% of users still with us at six months and about 45% of Premium subscribers.

The 1000x version

Every household's money runs through Pocketbook: couples first, then the teenager, the parent you support, the roommates, the trip group. Each group recruits its next member at the moment money is shared. We stop selling budgeting discipline to individuals and become the shared ledger and conversation for the people you split life with. The business model becomes a household plan, not a per-person subscription.

The growth engine is the key difference. Solo budgeting apps grow one user at a time through marketing. A household product grows through its members. Each shared rent payment, holiday or new dependent is a chance to recruit someone.

The mechanism: three loops

1. The other person is the reason to open the app. Couples open Pocketbook 11 days a month, against 4 for solo users. Most of those sessions start from a notification about the partner's spending ("Alex spent $48 at the grocery store"). Solo budgeting runs on willpower, which fades. Shared budgeting runs on another person, who keeps giving you reasons to open the app.

2. The product is the money conversation. 41% of couples add a "money talk" note to a transaction in their first month. They do this even though notes were an afterthought. Couples are using us to talk about money, not just to track it. Talk is the habit that holds a household together.

3. Groups grow, and they start at shared-expense moments. 16% of couples add a third person within a year, and households retain best of all (71%). Shared budgets that start from an invite link during rent or a holiday retain best.

Today the growth loop barely works. 3% of solo users invite someone, and 22% of those invitees join. That's under 1 new member per 100 solo users. This is the biggest lever we have.

What could make this wrong

The numbers above are not proof that sharing causes retention. Couples who found today's sharing are self-selected: committed, organised, probably already engaged. The 100% invite and join rates for shared groups are true by definition, not a result.

The real question is whether a solo user nudged into sharing starts behaving like today's couples (58% retention) or stays like a solo user (17%). The plan below is built to answer that.

We also need to confirm how the 19% and 31% Premium rates are counted, per person or per budget, before designing any household pricing.

What we build first (next quarter)

Couples only. We build three things, aimed at the moments the data says matter:

1. "Share this" on a transaction or bill. Rent, a trip, a big purchase each generate an invite link that opens straight into a shared budget. This targets the entry point that retains best, instead of a buried settings page.
2. Partner activity notifications, on by default. Users get simple controls over what their partner sees, for example categories only or purchases over $X. Privacy is a real risk in couples' money; getting the defaults wrong will cause harm and generate support tickets.
3. Notes upgraded to replies on transactions. This turns the afterthought into a lightweight conversation thread.

Not this quarter: - 3+ person households - Roommate or trip groups - Household pricing

These come only if the couples loop proves causal.

How we'll know it's working

We'll run a holdout: a random slice of solo users who don't see the new invite prompts. That lets us measure impact rather than selection.

Leading indicators (readable within the quarter):

Lagging indicators (we'll have early reads; full answer after the quarter): - 3-month retention of new couples against the holdout, as an early read. 6-month retention against the holdout as the verdict. - Premium conversion of new couples against the holdout.

Decision rule: We commit to the household roadmap if both of these hold: - Couples formed through the new flows retain at least twice as well as the holdout at 3 months. - They are active more than 8 days a month.

If they look like solo users, we've learned the uplift is mostly selection. In that case shared budgets stay a solid retention feature for people who already want it, not a growth strategy. That is still worth shipping, but it's a 2x, not a 1000x.

The ask: One quarter for one squad to build the three couples features and the holdout. The household decision goes on the next planning cycle, made on real evidence.