Every client's period, down to the double rule.
Mendiola is the operating system for accounting firms on Jaz. It reads your clients' documents, checks their books and prepares each close. Your accountants review what it found, and sign.
In alpha with close to 80 organizations, in the United States and the Philippines.
Calderon & Reyes CPAsSample firmOctober 2026Calderon Studio, October close
Run October's close for this company. Mendiola reads the books in Jaz, runs the checks and brings you only what needs a decision.
A sample firm and company, not real books. Run the close, decide the two proposals, then sign.
Mendiola by DoubleRule. DoubleRule has kept small businesses' books since 2013. We built Mendiola for our own accountants first, and they work in it every day. Our record
Our only customers are accounting firms. Mendiola never sells to your clients, and your clients' data never feeds DoubleRule's own sales.
See it work
Three views of the same product: the firm's whole month, the checks behind one company, and the agent your people ask. Red is Mendiola working; blue is your people deciding and signing.
A partner's question is never about one client. It is: where does the whole firm stand, ten days after month end? Press play.
- Open 36
- Mendiola checking 0
- Proposals waiting for you 0
- Review requested 0
- Signed off 0
Point at a company to see its month. A sample firm; the days are illustrative.
Mendiola checks. Your people decide.
Mendiola proposes: a bank match, an accrual, an answer to a reviewer's question. Each proposal shows its reason and waits. The numbers you review are worked out by code from the books, never written by a model.
- Sending to the ledger is off for each company until an admin turns it on.
- A proposal is re-read before it is used, never sent blind.
- Sign-off is a person's, always. Mendiola warns; it does not block, and it does not sign.
VAT-status statement, TIN and branch code
The seller must state whether it is VAT or non-VAT registered, followed by its TIN and branch code. Without it, a VAT-registered buyer loses the input tax credit.
In the Philippines, every BIR invoice rule is kept as data with the law it comes from. Break a sample invoice to watch them work.
Ask about any client, in plain words
Your firm's agent reads the books through fixed tools, answers with the figures, and drafts. It never sends anything for you, and anything that would change a client's books waits for your click.
- Reads: close status, reviews, postings, files
- Drafts: emails in the firm's Gmail, never sent
- Changes in Jaz: only on the asker's confirmation
Ask MendiolaSample firmCalderon & Reyes CPAsChoose a question. The agent reads your firm's books through fixed tools, answers, and drafts; anything that would change the books waits for your click.
Built on Jaz
Mendiola works on one ledger, Jaz, sold as Juan in the Philippines. Your clients' books stay in Jaz, where your team already works. Mendiola reads them, and writes only drafts and the changes a person approves.
If your clients are on another ledger today, their books move to Jaz first. We'll tell you plainly what that takes during the walkthrough.
Your firm's walls hold
A company belongs to one firm. A company marked private is seen by the person who created it, and nobody else, not even another admin. Every change names who made it.
What alpha means here
In alpha with close to 80 organizations, in the United States and the Philippines. Here is exactly what is live, what we switch on with you, and what is still to come. Every release is published, with its date, on What's new, and counted week by week.
Live for every alpha firm
Released and in production use.
- Documents to the ledger
- Close monitoring and sign-off
- Closing review
- Firm agents
- Firm brain
- Activity log
- BIR invoice vouching (PH)
- Summaries of purchases and sales (PH)
- POS sales reports (PH)
- Tax filings (PH)
- EWT exposure (PH)
- Audit risk (PH)
Switched on with you
In production; we turn it on for your firm and watch it with you.
- Automated close
- Period lock
- Audit readiness and case clock (PH)
Built, not yet released
Tested, and waiting for its release.
- Bank data through Plaid (US)
How alpha firms work with us: you talk to the people who build Mendiola, your feedback shapes what ships next, and nothing is switched on for a company without an admin choosing it. Join the alpha
Is Mendiola right for your firm?
Four questions, an honest answer, and the parts of Mendiola that fit. Your answers go with you to the walkthrough, so we start where you are.
Question 1 of 4
Where is your firm?
Questions partners ask us
Kept the way Mendiola keeps a reviewer's queries: each one raised, answered, and signed. Open any of them.
Q-01Do my clients' books have to move to Jaz?Answered
Yes. Mendiola works on one ledger, Jaz, sold as Juan in the Philippines. Companies already there can start at once; the rest move first. We'll say plainly what that takes for your firm in the walkthrough.
Q-02Does an AI model change my clients' books?Answered
No. Models read documents and draft words. Code computes every figure you review. A change reaches the ledger only when a person approves it, and sending is off for each company until an admin turns it on.
Q-03What happens when Mendiola is wrong?Answered
Every proposal shows its reason, so a reviewer can see why before approving. A rejected proposal sends nothing. Sign-off stays a person's, and every change names who made it in an append-only activity log.
Q-04Will you sell to my clients?Answered
No. Our only customers are accounting firms. Mendiola never sells to a firm's clients, and your clients' data never feeds DoubleRule's own sales.
Q-05Can every member of my staff see every company?Answered
No. Members work on the companies they are assigned to. A company marked private is seen only by the person who created it; another admin gets the same answer as a stranger.
Q-06Where is our data kept?Answered
Mendiola's database and web application run in Singapore, and background jobs in the United States. Jaz keeps every organization's books in Singapore, US companies included. The security page maps every service.
Q-07Can we connect our US clients' banks?Answered
Bank data through Plaid is built and tested, and not released yet. It will be read-only, and nothing from it is written to the ledger. Until then, bank lines come from Jaz as they do today.
Q-08Does Mendiola file our clients' BIR returns?Answered
No. It tracks every return each company owes, filed or not and paid or not, and keeps a copy of each filing document Juan holds. Filing stays with your firm.
Q-09What does it cost?Answered
Per organization, per month: US$40 for a firm in the United States, PHP 2,000 for a firm in the Philippines, with every module for your country. A subsidiary of one of your clients is free in any month it has fewer than 200 transactions; with 200 or more, it costs the same as any organization. Alpha firms pay nothing until launch. See the pricing page to work out your month.
Read it for yourself
Everything here is open, with no form to fill in: the close we run, the rules we check, where your data goes and what we may touch, and one page to hand your partners.
- CloseThe month-end close, step by step28 steps in 11 phases, each saying who does it. Prints as a checklist for your own next close.Philippines
- RulesEvery BIR invoice rule we checkAll 52, word for word, each with the law it comes from. Search by a word or a regulation.Philippines
- DataWhere your data goesEvery service that touches a client's books, the country it runs in, and what stops it doing more.Both countries
- AccessWhat Mendiola may touchEvery connection: what it reads, what it writes on its own, what waits for a person, and what it never does.Both countries
- BriefMendiola on one pageFor your partners: what it does, how your firm stays in control, what it costs. Prints on one Letter page.Both countries
See your own close in Mendiola.
We'll walk through a month for one of your companies, with the people who built it and use it every day.
- Prepared
- Mendiola
- Reviewed
- Your reviewer
- Signed off
- Your partner