Meridian.
Time tracking and invoicing, in preview

Every hour accounted for.

Meridian keeps a weekly timesheet and expenses for each client, turns unbilled hours into an invoice with a PDF, and shows what is still owed. It does not send email.

See the timesheetHow invoicing works
Illustration: a walnut ledger desk with a blank open ledger and a brass hourglass beside a banker lamp.
Features

A timesheet, an expense list, and an invoice, kept in one place

Meridian does the plain part of billing well: it holds the hours and the receipts, and it builds an invoice from whatever has not been billed. It does not send the invoice for you.

Hours in, one cell at a time

01

A weekly timesheet

One row for each project and task, one column for each day. Type hours into a cell and they save. Step a week back or forward, or jump to today, and every row shows its total.

02

Add Row

Choose a project, a task, a date, and the hours, and the row joins the grid. Every hour belongs to a project and a task, so it is billed at that task's rate.

03

Hours that wait to be billed

Each entry stays uninvoiced until an invoice takes it. The new-invoice form lists exactly those hours, so nothing is billed twice and nothing is forgotten.

04

Month fill, through the API

One call puts the same hours on every weekday of a month for a task, which suits a retainer. It is an API and agent-tool call today; the web app has no button for it.

What you spent, and who you spent it for

05

Expenses

Record a date, project, category, amount, and note. Filter the list by project, see the running total, and delete a mistake. A PDF receipt can be stored on an expense through the API.

06

Expense categories

Meridian starts you with six: Entertainment, Lodging, Meals, Mileage, Other, and Transportation. Add your own on the Manage page, archive the ones you stop using, and delete one that nothing refers to.

07

Clients and their contacts

A client has an address, a currency, and the number of days an invoice is due. Each client holds contacts with a name, title, email, and phone numbers.

08

Projects

A project has a code, a client, dates, and the tasks it can bill. Filter by status and client, duplicate one to start the next, archive it when it ends, and delete it only if no time was ever recorded.

09

Tasks with their own rates

A task is a kind of work, such as Design review or Customer call, with its own hourly rate, and one task can be attached to many projects. Archive a task to hide it from the timesheet; delete one only if no time was recorded against it.

From unbilled hours to a PDF

10

One form

Pick the client, set the dates, and tick the uninvoiced time and expenses to include, with Select All for each list. The due date follows the client's due days.

11

Weekly lines

Time is billed as one line per task per week, with hours, the task's rate, and the amount. Expenses are separate lines, and the total sits at the bottom.

12

A lifecycle with a history

An invoice is a draft, then sent, then paid or written off, and every change is written to a history log. Mark Sent only records the status. Only a draft can be deleted.

13

A PDF

Download the invoice as a PDF with your company at the top, the client it bills, the lines, and the total. You send it yourself.

14

A list you can filter

Filter invoices by status or client, including an Overdue filter for sent invoices past their due date, with the total of what is showing.

What is owed

15

Accounts receivable

The amount outstanding, the number of open invoices, how many are overdue, and a table of each open invoice with its days outstanding.

16

Invoice report

Pick a date range and a client to see the total amount, the total hours, and the invoices behind them, then download the table as CSV.

17

Company settings

Your company's name, address, phone, and email, printed on every invoice, plus a default billable rate.

Screens

See it in light and dark

Real captures of the running tool, with fictional StrataForge Robotics data. They follow your theme.

Meridian's invoice list for StrataForge Robotics, a fictional company: thirteen invoices with their numbers, clients, subjects, issue and due dates, a status badge for draft, sent, paid, or written off, and the amount, with a total above the table.Meridian's invoice list for StrataForge Robotics, a fictional company: thirteen invoices with their numbers, clients, subjects, issue and due dates, a status badge for draft, sent, paid, or written off, and the amount, with a total above the table.
The invoice list: thirteen invoices for seven fictional customers, filtered by status and client, with a running total. Enlarge to see the full screen.
Meridian's weekly timesheet, a table with one row per project and task, a column for each day from Monday 10/19 to Sunday 10/25, an editable hour cell in each, and a total per row.Meridian's weekly timesheet, a table with one row per project and task, a column for each day from Monday 10/19 to Sunday 10/25, an editable hour cell in each, and a total per row.
The timesheet: one row per project and task, one cell per day, a total on every row.
Meridian's expense list, with a date, project, category, notes, and amount on each row, a delete button, a project filter, and the total above the table.Meridian's expense list, with a date, project, category, notes, and amount on each row, a delete button, a project filter, and the total above the table.
Expenses: what was spent, on which project, in which category, with a running total.
Meridian's project list showing six active projects with their codes, clients, the tasks that can be billed to each, and start and end dates, plus duplicate, archive, and delete buttons on each row.Meridian's project list showing six active projects with their codes, clients, the tasks that can be billed to each, and start and end dates, plus duplicate, archive, and delete buttons on each row.
Projects: grouped by client, filtered by status, with duplicate, archive, and delete.
Meridian's Manage page on the Clients tab, listing nine clients with their city, currency, due days, and status; the first client is open and shows three contacts with their titles and email addresses.Meridian's Manage page on the Clients tab, listing nine clients with their city, currency, due days, and status; the first client is open and shows three contacts with their titles and email addresses.
Clients: each one holds its due days and its contacts.
Meridian's Manage page on the Tasks tab, a table of tasks with a billable rate per hour and an Active or Archived badge.Meridian's Manage page on the Tasks tab, a table of tasks with a billable rate per hour and an Active or Archived badge.
Tasks: each has its own hourly rate and can be archived out of the timesheet.
Meridian's New Invoice page: a form for client, invoice number, issue and due dates, purchase order number, subject, and notes, followed by lists of uninvoiced time and uninvoiced expenses with a check box on each row and a Select All button.Meridian's New Invoice page: a form for client, invoice number, issue and due dates, purchase order number, subject, and notes, followed by lists of uninvoiced time and uninvoiced expenses with a check box on each row and a Select All button.
A new invoice: pick the client, then tick the uninvoiced time and expenses to bill.
Meridian's invoice PS-2036-006 with a Sent badge, buttons for PDF, Mark Paid, and Write Off, and the invoice itself: StrataForge Robotics at the top, the client it bills, the subject, and weekly time lines with hours, rate, and amount.Meridian's invoice PS-2036-006 with a Sent badge, buttons for PDF, Mark Paid, and Write Off, and the invoice itself: StrataForge Robotics at the top, the client it bills, the subject, and weekly time lines with hours, rate, and amount.
An invoice: weekly lines per task at the task's rate, then expenses, then the total. Download it as a PDF.
Meridian's Accounts Receivable report: three cards for the outstanding amount, the number of open invoices, and the number overdue, above a table of the eight open invoices with an Overdue, Sent, or Draft badge and the days outstanding.Meridian's Accounts Receivable report: three cards for the outstanding amount, the number of open invoices, and the number overdue, above a table of the eight open invoices with an Overdue, Sent, or Draft badge and the days outstanding.
Accounts receivable: what is owed, what is open, and what is late.
Meridian's Invoice Report: filters for a date range and a client and a CSV button, cards for total amount, total hours, and invoice count, and a table of the thirteen invoices with their hours and amounts.Meridian's Invoice Report: filters for a date range and a client and a CSV button, cards for total amount, total hours, and invoice count, and a table of the thirteen invoices with their hours and amounts.
The invoice report: filter by dates and client, then download the rows as CSV.
Meridian's Settings page with the company's name, address, city, state, ZIP code, phone, email, and a default billable rate.Meridian's Settings page with the company's name, address, city, state, ZIP code, phone, email, and a default billable rate.
Settings: the company details printed on every invoice.
How it works

From an hour worked to money in

  1. Log

    Put hours on the weekly timesheet and expenses on the expense list, each against a project.

  2. Invoice

    Choose a client, tick the unbilled time and expenses, and save a draft with weekly lines.

  3. Send

    Download the PDF and send it yourself, then press Mark Sent. Meridian records the status and a history row; it sends nothing.

  4. Collect

    Press Mark Paid when the money arrives, or Write Off if it never will. Check the receivables report for what is still open.

Accessibility

Built so everyone can use Meridian.

Meridian is a web app, and this is what its code, tests, and real-browser scans show today. It has a skip link, labeled landmarks, a header navigation that works at every width, and an axe-core scan that finds no serious or critical violations on its nine screens at 375 and 1,440 pixels in light and dark. Nobody has tested it with a screen reader or walked it with only a keyboard, and we do not claim a conformance level for it.

  • Partly supported

    Keyboard operation

    Every page starts with a skip link to the main content, and the header navigation, buttons, filters, and the timesheet's hour cells are standard links, buttons, and fields that take Tab focus. Dialogs are labeled and close on Escape. The code does not move focus into a dialog or trap it there, and nobody has walked every flow with only a keyboard.

  • Partly supported

    Screen reader landmarks and labels

    Pages have a main landmark and a labeled navigation, buttons and filters carry accessible names, table headers are marked as column headers, and the loading state is announced politely. An axe-core scan finds no violations on the nine screens. Meridian has not been tested with VoiceOver, NVDA, or any other screen reader, so how it reads aloud is unknown.

  • Partly supported

    Contrast in light and dark

    Before the 10/29/2026 scan the primary buttons measured 2.76 to 1 in light and 3.32 to 1 in dark and the Sent badge 4.24 and 3.9 to 1; both were fixed, and the scan's color-contrast rule now passes on all nine screens in both themes. The scan measures the screens as seeded, with text on its real backgrounds; it cannot judge every state, such as a hover or a disabled button.

  • Partly supported

    Reduced motion

    The design system's global stylesheet shortens animations and transitions to almost nothing when the system asks for reduced motion. This was read from the stylesheet and not checked in a browser with the setting turned on.

  • Not yet tested

    Text resize and zoom

    Nobody has tested Meridian at larger text sizes or browser zoom. The timesheet is a wide grid, so large text may push it into horizontal scrolling.

  • Partly supported

    Mobile and touch

    The header navigation collapses to a drawer on a phone, so every page is reachable at 375 pixels. The scan found no horizontal overflow on any of the nine screens at 375 pixels, and wide tables scroll inside a region the keyboard can reach. Nobody has used it on a phone for real work, and the timesheet is tight at that width.

Read the accessibility statement and evidence
Tech specs

Under the hood

Meridian technical specification
Backend
  • FastAPI on Python 3.12 with async SQLAlchemy 2
  • PostgreSQL, with an Alembic migration (1 so far); money is stored as exact decimals, never floats
  • REST under /api/v1 for clients, contacts, projects, tasks, time, expenses, invoices, reports, and settings
  • PDF invoices drawn with fpdf2; CSV for the invoice report
  • Receipt files (PDF) stored by the API and linked from the expense list
Frontend
  • React 19, Vite, and TypeScript, with TanStack Query for data
  • The Renkara design system: a top navigation bar that becomes a drawer on a phone, light and dark themes
  • A skip link, labeled landmarks, and keyboard-reachable tables (see Accessibility)
Data model
  • Clients with contacts; projects and tasks; time entries by project, task, and day
  • Expenses with categories and an optional receipt
  • Invoices with weekly time lines, expense lines, and a history of every status change
Access
  • Signed-in sessions through the fleet's identity service, client certificates, service tokens, or an API key
  • 49 agent tools over the same API
Quality
  • 157 backend test functions and 32 browser end-to-end tests, counted by search on 10/29/2026
  • A test that checks every call the web app makes against the routes the backend serves
  • An automated axe-core scan of every screen (see Accessibility)
Stands in for

Harvest

MCP tools

Built for agents as well as people

Meridian ships an MCP server so a coding or planning agent can run the billing desk: log time and expenses, fill a month, build and send an invoice, and read the receivables report. It is also the way to edit a record the web app cannot.

Clients and contacts

  • list_clients
  • create_client
  • update_client
  • delete_client
  • list_client_contacts
  • create_client_contact
  • update_client_contact
  • delete_client_contact

Projects and tasks

  • list_projects
  • get_project
  • create_project
  • update_project
  • archive_project
  • duplicate_project
  • delete_project
  • list_tasks
  • create_task
  • update_task
  • archive_task
  • delete_task

Time

  • log_time
  • list_time_entries
  • update_time_entry
  • delete_time_entry
  • fill_month

Expenses and categories

  • log_expense
  • list_expenses
  • update_expense
  • delete_expense
  • list_expense_categories
  • create_expense_category
  • update_expense_category
  • archive_expense_category
  • delete_expense_category

Invoices

  • list_invoices
  • get_invoice
  • create_invoice
  • update_invoice
  • get_uninvoiced
  • send_invoice
  • mark_invoice_paid
  • write_off_invoice

Reports and settings

  • invoice_report
  • accounts_receivable
  • get_settings
  • update_settings

Identity and health

  • get_my_identity
  • check_service_health
  • get_diagnostics
FAQ

Questions people ask

Can I use Meridian today?

It is in preview, and this site shows it running locally on a fictional company's data. There is no sign-up and no price here. To ask about access, write to contact@renkara.com.

Does Meridian email my invoices?

No. Mark Sent changes the invoice's status to sent and adds a row to its history, and that is all. Nothing is mailed. You download the PDF and send it yourself.

Whose data is this?

Every screenshot shows the Customer Engagements billing desk of StrataForge Robotics, the fictional company from the novel The Deferral, run by the made-up desk lead Emi Maeda. The customers, hours, expenses, and invoices are all invented. No real client or invoice appears anywhere on this site.

Can I change a client or a project after I save it?

Not in the web app yet. You can create and delete clients, projects, tasks, categories, and expenses there, but there is no edit form for any of them. Changes go through the API and the agent tools.

Does it handle more than one currency?

Not yet. A client stores a currency, but every amount in the app and on the PDF is shown in US dollars.

Does it start with expense categories?

Yes, six: Entertainment, Lodging, Meals, Mileage, Other, and Transportation. Meridian creates them the first time it loads, if there are none. You can add your own on the Manage page and archive or delete the ones you do not use.

Is there a stopwatch or a phone app?

No stopwatch: you type hours into the timesheet. Meridian is a web app with a phone layout, and there is no iPhone, iPad, or Mac version.

Contact

Questions about this tool?

Write to Renkara Media Group and a person will answer.

Email contact@renkara.com