Company

About SIIZ

SIIZ turns the size your team agrees on into hours, a price, and an invoice — without anyone re-keying it.

Our software

Plans in, estimates out

SIIZ turns the size your team agrees on into hours, a price, and an invoice so you quote faster and win more work. Built for teams that bill for their work, from solo operators to growing companies that need more users and features.

Our team

Built for real operations

Our team is focused on delivering reliable software built for teams doing real client work. We built SIIZ to help them size honestly, quote faster, and grow with confidence.

SIIZ supports agencies, consultancies, product studios and internal engineering teams with one workflow from sizing to invoice.

What’s new

What's new in SIIZ 1.6.260

3 new, 2 better, 1 fixed.

Here is what changed in SIIZ in this update.

New

  • Alert sources: connect Azure Monitor, Datadog, Alertmanager, Grafana, UptimeRobot or any tool that can send a webhook, and an alert opens an incident at the severity you choose. If the alert fires again it is noted on the same incident, and when it recovers the incident can be marked Mitigated for you.

  • Incident reports: after an incident, write a blameless report on what happened, why, what helped and what will change, and publish it when it is ready.

  • Your organization can now choose its time zone, so today and the start of the week match where your team works.

Better

  • Your recent background jobs show in the top bar, and only the person who started a job sees its progress.

  • Picking a Slack channel is easier: choose it from a list instead of typing its name.

Fixed

  • Your profile now opens for everyone who has a manager.

From the SIIZ blog

Why estimates should breathe

By The SIIZ team ·

An estimate is a living agreement, not a frozen number. Here is how SIIZ lets one change in the open without losing the trail.

Every estimate starts as the best guess you can make with what you know today. The mistake is treating that guess as a promise carved in stone.

In SIIZ an estimate can breathe. Scope moves, so the number moves with it, and every change keeps its reason, its author and its approval. The client sees what changed and why, and nobody has to reconcile a spreadsheet after the fact.

  • Start from roles and hours, then refine as the work becomes clearer.
  • Turn the estimate into a proposal the client can accept in one click.
  • When scope shifts, raise a change order instead of quietly rewriting history.

The result is an estimate people trust, because it was never pretending to be certain.

Need a partner integration?

We work directly with partners on high-impact integrations to keep workflows aligned with current operations.

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