New startup ideas · AI for people who run the AI themselves · Solo professionals who wield AI themselves
startup concept
Tickstone
Turns a solo CPA's AI sessions into reviewable workpapers with tickmarks and source trails
A workspace where a solo CPA runs AI over client books and every number the model touches is tied back to a source document with a tickmark, producing workpapers that survive peer review and an IRS exam.
- Software subscription
- Small business
- MCP donated to the Agentic AI Foundation on December 9
3
similar startups, last 2 years (6 all-time)
yes
6 matching federal grants and programs
Direction supported by government programs and grants
Test it before you build it
$600 · 4 weeks · 20 prospects
For $600 and four weeks, prove that solo CPAs who already run AI over client books will prepay for exam-ready workpapers before any peer reviewer or IRS agent has forced the issue.
Riskiest assumption · A solo CPA who already runs AI over client books will pay $99 a month now for source-tied workpapers, before any peer reviewer or IRS agent has ever asked them to document AI use.
1Focus group: who and where
A solo CPA or 2-3 person firm doing tax and client accounting services, in the middle of the September 15 and October 15 extension crunch, already pasting trial balances and bank data into ChatGPT or Claude and then rebuilding the support by hand - especially one with a peer review or IRS correspondence exam in the last two years.
where to find 20 · r/taxpros, the credential-verified subreddit where these practitioners discuss AI workflows weekly (community); the public QuickBooks ProAdvisor directory and state CPA society member directories filtered to solo firms (directory); #TaxTwitter on X, reaching solo practitioners who post about AI use by DM (channel).
2Sell first, build later
Every AI-derived figure in a client engagement tied to a source document with a tickmark, producing workpapers that survive peer review and an IRS exam - sold now as a 48-hour manual build of one bank rec workpaper for $99, converting to the workspace when the cohort onboards November 16, 2026.
the ask · $99 per manual workpaper now; $99 per month founding subscription locked for 12 months, list price $149 per month
a real yes · A real yes is a $99 prepayment with a reconciliation attached or a cleared $199 cohort prepay; 'this would save me during busy season,' unpaid trial requests, and promises to sign up after October 15 count as no.
3Small experiments
The first one attacks the riskiest assumption; each ends with a number that says whether to run the next.
1. Fifteen extension-season CPA calls
$300 · 10 days
DM r/taxpros and #TaxTwitter participants who have posted about using AI on client work, and email 30 solo firms from the ProAdvisor directory, offering a $25 gift card for 20 minutes during crunch season. On each call, walk one real engagement: where AI touched the numbers, what documentation exists, and what they would hand a peer reviewer or revenue agent who asked how a figure was derived. End by offering the paid workpaper in experiment 2.
keep going if · 9 of 15 confirm AI touches client numbers with no source-tied documentation, and 6 of 15 agree on the call to a paid workpaper pilot
2. Paid manual workpaper pilot
$150 · 14 days
The CPA sends one anonymized bank reconciliation with statements; the founder returns a fully tied-out, tickmarked workpaper in 48 hours - every figure traced to a source document, in the firm's own referencing style. Charge $99 prepaid by card, the exact price the product will carry, offered to all 20 prospects. The founder builds each one by hand in Excel.
keep going if · 7 of 20 offered prepay the $99 and send a reconciliation
3. Founding cohort prepay
$150 · 14 days
Launch a one-page site with the founding offer: $99 a month locked for a year against a $149 list price, 15 slots, cohort onboarding November 16, 2026 - deliberately after the October 15 deadline. The buy button collects $199, prepaying the first two months. Pitch on every call and in one follow-up email to all 20 prospects.
keep going if · 5 of 20 prepay the $199
4Collect a deposit up front
Tesla took $1,000 refundable reservations for the Model 3 and $100 for the Cybertruck before building either: the deposit is the measurement, not the revenue.
$199
per prospect, refundable
how · The first two months prepaid at checkout - $199 collected on the landing page, the classic small-business-owner instrument, fitting a buyer who already pays for tax software, e-signature and portals by card with no procurement; the CPA checks out, no contract signature required. set up: Stripe Checkout ↗
what it reserves · One of 15 founding slots, the $99 monthly rate locked for 12 months, onboarding on November 16, 2026, and the firm's own tickmark and referencing conventions loaded first
refund · Refunded in full, no questions asked, any time before the November 16, 2026 onboarding; after that it converts to the first two months of service.
target · 5 prepays of $199 from 20 prospects within 30 days
before taking money · Client books are confidential and CPAs answer to state boards, so accept only anonymized or client-consented data in the manual pilots and claim no peer-review or IRS acceptance until an actual reviewer has passed a Tickstone workpaper.
Go: build it if
7 of 20 pay $99 for the manual workpaper and 5 of 20 prepay $199 - at least $1,600 collected from 20 prospects in four weeks.
Kill: stop if
Fewer than 3 paid workpapers and fewer than 2 prepays from 20 prospects, or 10+ of 15 calls conclude that screenshots plus their existing engagement binder satisfy them until a regulator says otherwise.
5 Scripts to run itoutreach message, landing copy, deposit terms · click to open
outreach message
You're mid extension season and, like half of r/taxpros lately, probably running client numbers through ChatGPT and then rebuilding the support by hand. I'm building Tickstone: every AI-derived figure tied to a source document with a tickmark, workpapers that survive peer review and an exam. Before I build it, I'll turn one of your client bank recs into a fully tied-out, tickmarked workpaper in 48 hours for $99. Worth a 20-minute call this week? There's a $25 gift card in it for your time.
landing page
Workpapers that survive peer review, from your AI sessions $99 a month founding rate locked for a year (list $149) - prepay $199 for your first two months and one of 15 cohort slots Prepay and claim a founding slot
deposit terms
Your $199 prepays the first two months at the $99 founding rate, locked for 12 months, and reserves one of 15 cohort slots onboarding November 16, 2026. It is fully refundable, no questions asked, any time before onboarding. Send anonymized client data only until an engagement letter is signed.
Would you run this test?
One tap. The yes-share feeds the Demand pillar of this idea's score; nobody sees who answered.
Budgets are out-of-pocket estimates for a team of one to three, US market. Size the deposit to the deal, and check the terms before taking money in a regulated line.
Scorecard
Ranked against every idea in the catalog: trend, demand and 100x potential from the corpus, competition relative to the other ideas. A generated concept has no judges or swipes yet, so its pillars use the data signals only.
62
Idea Score, 0-100 · raw 38.5 x 1.61
Warm
competition: more crowded than 52% of ideas · headwind x0.74
+2.6
government priorities, secondary (6 matching grants)
Trend
36
Is the wave forming now? 2025-26 entrants vs 2023-24, rounds since 2025, the sector's live-batch direction, the 2026 trend analyst.
- Entrants 2025-26 vs 2023-24 (similar companies)59
- Rounds announced 2025+ in the sector0
- Sector direction (live batch)50
Demand
40
Does anyone want it? YC's current RFS, companies already paid for something similar, the operator judge, founders' yes-rate in decks, readers who would run the test.
- YC asks for it (current RFS: idea / sector)30
- Someone already pays (similar companies, recent / all-time)50
100x potential
78
Can it return a fund? The venture judge (double weight), market-size and moat axes, neighbours still alive, the technologist judge.
- Neighbours still alive78
Score = 100 x cbrt(Trend x Demand x 100x) x (1 - 0.5 x crowding) + government bonus (max 5), calibrated so the 95th-percentile idea scores 90 (order never changes). A geometric mean: a weak pillar cannot be papered over. Percentiles are among the 382 ideas in the catalog; the terms matched were solo, cpa, sessions, reviewable, workpapers, tickmarks, source, workspace.
The concept in full
- What
- A workspace where a solo CPA runs AI over client books and every number the model touches is tied back to a source document with a tickmark, producing workpapers that survive peer review and an IRS exam. The CPA signs off on each schedule rather than trusting a black box. In the first hour a practitioner uploads a client trial balance and gets a tied-out schedule with every AI-derived figure traced.
- Grounded in (2025-2026 signals)
- 'cpa firms' first seen 2025, 3 companies in 2025-2026 vs 0 before; 'accounting firm' first seen 2025, 3 companies vs 0 before; Rillet raised $100M growth on 2026-08-21 and reached unicorn status as an AI accounting startup; MCP had 97 million monthly SDK downloads and 10,000 active servers when donated on December 9, 2025.
- What it rides
- MCP donated to the Agentic AI Foundation on December 9, 2025. Tickstone is an MCP server the CPA plugs into whichever assistant they already use, so the evidence trail follows the accountant, not the chatbot vendor.
- Why now
- Rillet's $100M round on August 21, 2026 priced AI accounting as a category, but it and the 2025 cohort sell ledgers and coworkers, not evidence; 'cpa firms' appearing as a term only in 2025 with 3 companies means the wave is young enough that no one owns the workpaper layer the solo practitioner signs their name to.
- Wedge: first customer and entry point
- Solo CPAs among the 12% of US workers using AI daily, starting with one artifact: the tied-out bank reconciliation workpaper generated from an AI session. Price at $99 a month, under one billable hour.
- Closest real companies, as the generator saw them
- Cifrato is an AI Accountant for Accounting Firms and Combinely an AI coworker for Accountants; both replace labor. Moby Analytics does AI financial auditing as the auditor. Tickstone sells the review-and-evidence layer to the human who remains the accountant of record.
- Main risk
- CPAs may decide their existing engagement software plus screenshots is enough documentation until a regulator says otherwise.
Similar startups in the directory
Companies whose pitch matches most of the concept's terms (solo, cpa, sessions, reviewable, workpapers, tickmarks, source, workspace).
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Public money in this direction
US federal grants and open opportunities matched to the concept's terms.
National Science Foundation · SafeOSE · $2M
National Science Foundation · CyberAICorps SFS · $250K
National Science Foundation · CyberAICorps SFS · $250K
National Science Foundation · Use-Inspired NextG · $500K
National Science Foundation · CyberAICorps SFS · $200K
National Science Foundation · Innovation: Bioinformatics · $737K
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