SteadyLatch

Reliable Excel & API Automation

Check an Excel automation change before your client does.

SteadyLatch makes reliability tooling and fixed-scope automation for Excel reports that read files or APIs. The first product compares a workbook's results with approved outputs before you deliver a change, and packages the version you deliver with a tested way back.

Launch teaser, about 24 seconds, with an AI-generated voice-over, music and text on screen. Every terminal line is taken from the recorded demo of v1, some shortened with an ellipsis (…); the data is synthetic. The full 4-minute demo shows the four scenarios run end to end · Download the MP4 (2.4 MB)

01 · Product Reliability Kit

SteadyLatch Automation Reliability Kit

Check a change before you deliver it.

Status: v1.0.0

v1.0.0 is the current release and a download at purchase. Early-access buyers have it as a free update, in the download of their purchase.

The problem

You deliver an Excel automation that reads files or an API and builds a report. Weeks later the client asks for a change: a new rule, another column, a different endpoint. You edit the macro, and there is no cheap way to confirm that everything else still produces the same results. So you check a few cells by eye and hope.

How it works

  1. 01 · Input

    Files or an API

    CSV, JSON and .xlsx values, or API responses fetched from PowerShell with timeouts, bounded retries and structured logs.

  2. 02 · Contract

    Checked before anything is written

    Expected columns and types, with empty, zero and missing values told apart. A broken input stops the run.

  3. 03 · Compare

    Against approved outputs

    The macro runs on a copy of the workbook in local Excel. Its results are compared with golden files, using numeric tolerances per column.

  4. 04 · Report

    Differences you can show

    Markdown for people, JSON for machines, and a stable exit code. New golden files are approved explicitly, never overwritten silently.

Four demo scenarios

The kit ships with a synthetic demo workbook (invented sales data) that walks through each scenario. Each one has a short clip with an AI-generated voice-over, music and text on screen; every terminal line is taken from the recorded demo of v1, some shortened with an ellipsis (…).

  1. Scenario 1

    An input column changes

    A column is renamed or a required value is empty. The run stops with a clear contract error before any output is written.

    Clip, about 15 seconds · Download the MP4 (1.2 MB)
  2. Scenario 2

    The API misbehaves

    Timeout, rate limit or invalid JSON. Bounded retries where they make sense, an explicit failure where they don't, and no partial output.

    Clip, about 16 seconds · Download the MP4 (1.3 MB)
  3. Scenario 3

    A macro is modified

    The changed macro runs on the test input and its output is compared with the approved result: zero differences, or a list of cells with expected value, actual value and delta.

    Clip, about 18 seconds · Download the MP4 (1.7 MB)
  4. Scenario 4

    A new version is delivered

    The VBA is exported to text with an environment manifest, the version is packaged with checksums, and a tested recovery procedure restores the previous version and checks it against the approved result (Pro and Consultant).

    Clip, about 17 seconds · Download the MP4 (1.5 MB)
Recorded demo, about 4 minutes, no sound, captions on screen: the four scenarios run from the release candidate of v1 (1.0.0-rc1, Pro package) on Windows 11 with Microsoft 365 Excel. Commands and output are real; the data is synthetic. Download the MP4 (4 MB) · Text version (another run of the same script: ids and times differ).

Licenses

A one-time purchase, VAT included. Each license covers one developer and includes updates within 1.x. Pro and Consultant hold the same files; Consultant also lets you hand the kit's files over in client work.

Solo

€59

VAT included · one developer
  • Regression runner with golden files, numeric tolerances and Markdown/JSON reports
  • Data contracts for CSV, JSON and .xlsx values
  • API client with timeouts, bounded retries and structured logs
  • Local Excel runner (Windows, Excel desktop, attended)
  • VBA modules for error handling and batches
  • Synthetic demo with the four scenarios (the fourth needs the delivery tooling)
  • Getting-started guide, known limits and troubleshooting

Buy Solo · €59

Pro

€119

VAT included · one developer
  • Everything in Solo
  • VBA export to text with an environment manifest, and VBA import
  • Delivery package with checksums
  • Tested recovery procedure
  • GitHub Actions template for your repository
  • Guide to working with Claude Code

Buy Pro · €119

Consultant

€249

VAT included · one developer
  • The same files as Pro
  • Include files of the kit, modified or not, in work you deliver to your own clients: the checks in their repository, the VBA modules in their workbook
  • The client may use and maintain them as part of that work
  • Not for selling or distributing the kit as a product of its own

Buy Consultant · €249

Not included in any license: running VBA in hosted CI (Microsoft does not support unattended Office automation) · Excel for Mac, Excel for the web, Office Scripts or Google Sheets · comparing formatting, charts, pivot tables or formulas: values only · adapting the kit to your workbook (that is a separate service).

Requirements: PowerShell 7.4+ · Windows with Excel desktop to run macros and to export or import VBA. Supported with v1.0.0: Windows 11 with Microsoft 365 Excel (64-bit) and PowerShell 7. Checks that do not need Excel were also tested on Linux (Ubuntu) in GitHub Actions. Tested versions are listed in the kit's limits page.

Buying

Checkout

Checkout opens on Polar, the merchant of record. You accept the terms there; your download includes the release ZIP of your license, its SHA256SUMS file and a plain-text copy of the terms.

SHA256 of the v1.0.0 ZIPs:

  • …-1.0.0-solo.zip 46d869d70082ecec250723a34e7a0ac8dde74921c92aff6f7598676b7ccd8476
  • …-1.0.0-pro.zip 102dc3f73d77a408a306f63b371455373afeeb84484a0de1c7aeedf22f8baa86
  • …-1.0.0-consultant.zip 425b57e253dd533ab40640ac40f3aa1d4f49283cee3a051749930b26a3a0592f
License
One developer per license, for your own personal, professional or internal work, including checks on client work. Colleagues may run the checks you set up and read their results. Only Consultant allows including the kit's files in client deliverables. License terms
Refunds
Full refund on request within 14 days of purchase. EU consumers also have a 14-day right of withdrawal. Refund terms
Support
Email help with installation questions and reproducible defects. Adapting the kit to a specific workbook is a separate service.
Checkout
Payments are handled by Polar, acting as merchant of record: it charges any VAT or sales tax (included in the price) and sends your invoice.
Bought during early access?
v1.0.0 (Pro package) is in the download of your purchase, as a free update. Your purchase keeps the terms of 30 September 2026, including their refund policy.

02 · Service Done for you

Custom Excel report automation

A fixed-scope service for recurring Excel reports built from files or a read-only API. Each delivery includes the workbook with its VBA as text, a data contract, acceptance tests you can re-run, a run log and a setup and recovery guide.

Written process only, no calls. Scope, environment and acceptance criteria are agreed in writing before work starts.

Offered through Fiverr: see the listing, packages and FAQ.

03 · Contact Email only

Contact

Questions about the kit or the service: hello@steadylatch.com

No forms and no calls. Please do not send passwords, API keys or personal data.