Keisan turns a plain-English project brief into an itemized estimate with line items by role, hours, and rate. You can apply editable rate cards, model optimistic, likely, and pessimistic scenarios, add margin to see profitability, and export a client-ready proposal as a PDF.

How accurate and defensible are the estimates?

Estimates are itemized down to roles, hours, and rates so every number is traceable rather than a single black-box figure. You control the rate card and can model a full range of scenarios, which makes the totals defensible when you walk a client through them.

Can I edit the estimate before sending it?

Yes. Every line item, rate, scenario, and margin is editable. You can adjust the breakdown until it reflects how you actually want to price the work, then export the proposal and save it to your projects for later reuse.

Is my project and client data private?

Your briefs, estimates, rate cards, and proposals are scoped to your account and encrypted at rest, and we never use your content to train models.

How much does Keisan cost?

The Free plan lets you generate itemized estimates with a default rate card and core scenario modeling, no credit card required. Pro is $15 per month for unlimited estimates, custom rate cards, full scenario and margin modeling, proposal and PDF export, and saved projects. Enterprise is custom-priced with SSO, a self-host option, and dedicated support.

Legal

Privacy Policy

What we collect, why we collect it and the rights you keep at every step, in plain English.

Last updated · October 27, 2026

Introduction

Keisan (“we,” “our” or “us”) is operated by Jishu Labs LLC. This Privacy Policy explains how we collect, use, disclose and safeguard your information when you use our AI project estimation platform at keisan.jishulabs.com (the “Service”). We are committed to protecting your privacy and the confidentiality of the project briefs you write and the estimates we build for you.

Information we collect

We collect the following types of information:

Account information: your name, email address and password when you create an account.
Project briefs: the plain-English descriptions you submit so Keisan can build an estimate.
Estimates and related work: the line items, rates, rate cards, totals, timelines, projects, proposals and exports in your workspace.
Usage data: the number of estimates built, the features used and similar product activity.
Billing data: when you subscribe to Pro, Stripe processes your payment details. We never store full card numbers.
Device information: browser type, operating system and IP address, for security and to keep the Service working.
Product analytics: pages visited, clicks, scroll depth, page performance (Core Web Vitals), JavaScript errors and session replays, recorded with PostHog. Replays mask everything you type, and on signed-in workspace pages they mask all on-screen text, so the briefs and estimates in your workspace are not captured.
Messages: what you send through the contact form, with the name and email you give us.

How we use your information

To provide and maintain the Service
To turn your briefs into itemized cost and timeline estimates
To keep your projects, estimates, rate cards and proposals in your workspace
To process subscription payments and manage billing through Stripe
To send important service and security notices, and to reply when you write to us
To enforce plan limits and prevent abuse
To improve the accuracy and quality of the Service

Brief and estimate privacy

Everything you submit and everything Keisan builds for you is scoped to your account and stored encrypted at rest. We never share your briefs or estimates with other users, use them to train AI models, sell or license them, or make them public. An estimate is only shown to someone else when you send them its approval link. You can delete your data at any time from settings.

Data storage and retention

Your data is stored with Supabase in PostgreSQL, protected by row-level security policies so that only your account can read your own briefs and estimates. Data is encrypted at rest and sent over encrypted connections. We keep your data for as long as your account is active. You can export your data at any time, and deleting it from settings removes your projects, estimates, rate cards and settings permanently.

Third-party services

We use the following third-party services to operate Keisan:

Supabase: authentication, the PostgreSQL database and application storage.
Stripe: subscription billing and payment processing for Pro plans.
AI model providers (Anthropic, OpenAI): drafting estimates from your briefs. Briefs are sent over their APIs and are not used by them for training.
Netlify: hosting and production web infrastructure.
Resend: transactional email, such as account notices and messages sent through the contact form.
PostHog: product analytics and session replay, provided by PostHog, Inc. and hosted in the United States. This data is not sold or used for advertising, and it is not used to train AI models.

The current list is on the sub-processors page.

Your rights

You have the right to access your personal data, export your estimates, correct inaccurate information, delete your data and opt out of non-essential communications. To use these rights, go to settings or write to us at the address below.

Cookies

We use essential cookies for sign-in, session management and the demo workspace, and PostHog analytics cookies and local storage (names start with ph_) for product analytics. The analytics storage is set on .jishulabs.com and shared with jishulabs.com and the other Jishu Labs tools. If you declined cookies on jishulabs.com, analytics is not loaded. We do not use advertising cookies. See the Cookie Policy for details.

Changes to this policy

We may update this Privacy Policy from time to time. We will post any material change on this page and update the “Last updated” date above.

Contact us

Questions about this Privacy Policy can go through the contact page or to admin@jishulabs.com.

Questions about this document? Get in touch.