Solo GP

• Raising Fund II: prospective LPs ask to see how Fund I is actually doing, and the GP realizes the track record lives in a spreadsheet with six-month-old numbers.
• First institutional LP (a fund of funds or family office) joins and asks for quarterly reporting with real KPI history, not a vibes memo.
• The annual LP letter is due, and assembling it means re-reading 40 founder-update emails across two inboxes over a lost weekend.
• Portfolio crosses roughly 10-15 companies and the update chaos stops fitting in one person's head (the "spreadsheets break at 15-30 companies" trigger, inferred from vendor marketing in the best-practices research).
• A founder update arrives with a runway warning buried in paragraph six, gets missed, and the GP learns about the bridge round from Twitter.

The canonical row. Assumed 8 companies, Starter ($99, 5 companies included) plus 3 x $12 overage = $135/mo ARPA. Churn assumption 3.0%/mo, the upper half of the SMB 2-4% norm from the best-practices research: solo funds dissolve, pause, or lapse more than firms. Lifetime 33 months. GM-adjusted LTV $3,564 at 80% margin. Target CAC $1,188 at LTV/3.

Payback by channel. At $108/mo gross margin ($135 x 80%): referral (~$150 benchmark CAC) pays back in under 2 months, inbound (~$200) in about 2, content/SEO (~$290) in under 3. LinkedIn paid (~$980) takes about 9 months and eats most of the target CAC. High-touch outbound (~$1,980 blended) exceeds the $1,188 target outright: it does not pencil, ever, for this segment. Channel CACs are benchmark figures from the best-practices research, not observed.

Tier fit. At 8 companies Starter plus overage ($135) beats Portfolio ($199); Starter stays the strict cost minimum until 12 companies ($183 vs $199), at which point the upgrade conversation is a $16 difference plus doubled seats. Consistent with the product brief's worked pricing examples.

Expansion. Real but slower than the micro-VC's. Each new check adds $12/mo mechanically, and the natural end state of a successful solo GP is the emerging micro-VC row ($239 ARPA at 25 companies) or a Fund II Portfolio-tier upgrade. Expansion scored 3 of 5: the metered dimension grows with deployment pace, and a $5-15M fund deploys slowly. NRR upside is qualitative only; it is not baked into LTV.

Ex-product lead at a payments company, 25k-follower newsletter, closed a $12M Fund I eighteen months ago with 40 LPs: operators, two small family offices, one fund of funds that took a flyer. 11 portfolio companies, first check $250k.

Sunday night before the Q3 LP letter, Jordan has 9 founder updates spread across Gmail, two Notion links, and one Loom; three companies sent nothing. She copies MRR figures into the master sheet, notices one founder switched from GMV to net revenue without saying so, and has no way to tell whether the runway number is cash-in-bank or includes the unsigned bridge. The letter ships four days late with two numbers she privately does not trust.

What makes her buy: the email loop demo (founders reply, numbers appear with the source quote attached), a price she can justify against a ~$240k management fee without anyone's approval, and a 7-day trial she can load with real history in an afternoon via batch import.

What makes her churn: if deployment pauses and updates slow, the tool can feel like a subscription for a problem she only has four weekends a year; if Fund I winds down without a Fund II, the account dies with the fund. Retention depends on the between-quarters value: attention flags, digest, and the always-current record.

• "Seraf is $60 and Signed is $29; why pay $135?" Honest counter: those are personal trackers you type into. The price gap buys the collection loop (founders reply to email, extraction and chasing run themselves) and evidence-backed KPI history. Honest concession: a 6-company GP who enjoys data entry and reports to friendly LPs annually is genuinely fine on Seraf; PostMoney wins when the update volume or LP bar rises.
• "My portfolio fits in a spreadsheet." Counter: it does today. The trigger list is when it stops: Fund II diligence, the first institutional LP, company 12. Concede that pre-deployment Fund I with 4 companies is early; the trial and batch import make the switch a same-day job when the moment comes, which is why staying present in the segment's channels matters more than forcing the sale.
• "I am the whole firm; I do not want another inbox." Counter: guided review tasks interrupt only on exceptions (unmatched company, schema needed, conflict); everything else flows to the dashboard without the GP touching it. This is the segment the exception-driven design was built for.
• Churn and lifecycle risk (the honest one, no counter). 3.0%/mo assumed churn is structural, not pessimism. Solo funds pause between funds, wind down quietly, or graduate: the success path turns them into the emerging micro-VC row or a multi-partner firm (good churn only if the account upgrades rather than leaves). The 33-month expected lifetime already prices this in, which is exactly why acquisition above ~$300 blended CAC is uncomfortable despite the $1,188 ceiling.