Numeryn is an AI collaborator for accountants — whether you're at a firm closing client books or in-house closing your own. It investigates the books with read-only tools and drafts journal entries, mapping rules, and anomaly flags — every write waits for your Approve or Reject.
Nothing posts on its own. Ever. Every AI action is audit-logged.
Reclassify $4,200 wire to Hacienda La Esmeralda from 6120 Office Supplies → 5010 COGS — Green Coffee. Prior 11 wires to this vendor hit 5010.
The category is racing toward AI that posts entries while you sleep. We think that's wrong for anyone whose name is on the sign-off. Most tools we respect are solving for the solo founder who wants the books to disappear. We're solving for the accountant — in a firm or in-house — who will be asked, in three years, to explain a number to an auditor or a regulator. So we made different choices — some of them unfashionable.
We said no to
We said yes to
“The bookkeeper who loses their job to AI isn't the one using Numeryn.”
You open Numeryn. There are four gold cards waiting on your home screen — proposals from overnight.
The top one reads: "Entity 2: operating bank is $1,842.17 higher than GL. Likely a batch of vendor rebates credited directly, Mar 18 – Apr 2. Draft JE attached."
You hit ⌘K. You type "show me credits from the last two weeks over $200." Fourteen rows stream in, each with a source citation. You glance, nod, return to the card.
You click Approve. The entry posts. The card greys out with your name and a timestamp stamped on it.
Forty-one seconds. You move to the next one.
Entity 2: operating bank is $1,842.17 higher than GL. Likely unrecorded vendor rebates (Mar 18 – Apr 2). Draft JE attached.
Propose rule: memo contains "stripe payout" → 2150 Merchant Processor Clearing.
Flag ANM-018 looks routine given historical pattern. Acknowledge?
Hacienda La Esmeralda wire → COGS. JE-0247
This is the entire product surface. Cards to review, a palette to investigate, a ledger you already trust.
Numeryn watches every client's books 24 hours a day and surfaces the six kinds of quiet error that eat a bookkeeper's Friday: a miscoded wire, a duplicate invoice, a posting that lands in the wrong period, an unusual amount from a usual vendor, a stale draft, a balance that doesn't square to the source. Each one becomes a card with the evidence attached. You approve, dismiss, or investigate.
“$4,200 to Hacienda La Esmeralda hit Office Supplies. Prior 11 wires to this vendor hit COGS.”
Signal: vendor-history deviation
confidence: 94%
“March rent posted at $14,200 — 47% above the trailing 12-month mean.”
Signal: z-score on recurring entry
confidence: 88%
“Invoice #INV-2194 from Fedex Freight appears twice in March — same amount, four days apart.”
Action: review both JEs before close.
Anomalies are ranked by how much human judgment they need — not by how confident the AI is. High-confidence, high-leverage items float up first. Routine flags get auto-acknowledged with a one-click undo.
Every AI answer cites the GL line, transaction, or balance it came from — click through and land on the source.
Every proposed write is an immutable card with its prompt, inputs, model version, and approver stamped to it.
Multi-entity consolidation, role-based approvals, period locks. When the reviewer asks "why did we book this?" — the answer is one click, not one meeting.
Investigate
Cmd-K palette · read-only tools · cited answers
Propose
Gold card · preview · prompt & inputs logged
Approve
Human signature · session id · timestamp
Nothing crosses the Approve boundary without a human signature.
If your name goes on the close, the return, or the audit schedule — you're who we built this for. Three shapes of that persona fit the product today. If you want autonomous bookkeeping, we're not it. If you want a copilot that respects the sign-off, keep reading.
CPA & bookkeeping firms
Every client is a different chart, a different fiscal calendar, a different stack. Staff post, seniors review, partners sign — and the bottleneck is always the review queue. Numeryn drafts the staff-level work so your reviewers spend their time on judgment, not transcription.
In-house accountants & controllers
One entity, maybe a few subs, a finance team small enough to feel every miscode personally — and an external auditor who expects a clean trail anyway. Numeryn catches the anomaly before month-end and gives the auditor a signature on every posted entry.
Solo & fractional finance
A handful of clients or portfolio companies, no junior to delegate to, and your margin is literally the hours you save. Numeryn is the staff accountant you can't afford to hire — drafts everything, posts nothing without your click.
Probably not a fit: DIY founders looking for autonomous bookkeeping, teams that want the AI to post without review, or audit-optional workflows.
Numeryn is built by a small team with design input from partner-level CPAs and in-house controllers. We're invite-gated and not in a hurry to grow past what we can support.
If you want to be one of the first twenty pilots — firm, in-house, or solo — the form to your right is where the conversation starts. We read every submission ourselves, usually within a week.
What happens after you submit
You're on the list
We'll email you from a real address, usually within a week.
While you wait: see how we handle audit trails →