Validate your spreadsheets by snapping blocks.

Define once what your data should look like, and every file that lands checks itself, row by row.

Start freeSee how it works
The Blockema schema editor with field, type, rule and condition blocks

Formulas break, scripts rot, and checking by eye always misses something. 

How it works

From any spreadsheet to a clear verdict.

Three steps. You do the first one once; the other two every time a file lands.

Blockema's rule palette next to the schema on the canvas

The block language

Five pieces. That's the whole language.

Every block reads as a sentence, not a formula. If you can describe your data out loud, you can already build a schema.

  • FieldA column in your file: order_id, customer_email…
  • TypeText, number, date or boolean.
  • RuleUnique value, email format, max decimals, cannot be in the past…
  • ConditionIF quantity goes over 100, THEN require multiples of 10.
  • OperatorCompares fields and values inside a condition.
quantity
Number
Whole numbers only
Value ≥ 1
IF
quantity>100

THEN

Multiple of 10

Features

What's inside.

Rules and conditions

20 ready-made rules, plus IF / THEN / ELSE blocks for when one column depends on another.

Column matching

Blockema recognises your file's columns and assigns them itself. You only drag the ones it got wrong.

Error hotspots

Not an endless list of failures: the field and rule they cluster around, and one click to jump to the block.

In your browser or in the cloud

You pick before every run. In browser mode the file never leaves your machine; in the cloud you can close the tab while it runs.

Validation history

Every file that goes through is logged with its rows, errors and date. No more digging through email for who checked what.

Versions and notes

Schemas keep their history and take sticky notes pinned to blocks, so the rest of the team knows why each rule is there.

Define once, reuse forever

Visual beats doing it by hand.

Build it once and it covers every file that comes after. No going back into code or spreadsheets.

By hand or with code

  • Hours going row by row
  • Brittle formulas that break
  • Scripts somebody has to maintain
  • You depend on a technical person

With Blockema

  • Minutes, not hours
  • Without writing a single line of code
  • Define it once and it holds
  • Anyone on the team can do it

For the moment right before you trust a file.

  • Check your supplier's file before loading it into the system.
  • Validate payroll before you process it.
  • Check the product catalogue before pushing it to the store.
Library of saved schemas in Blockema

One schema per process. Saved, reused and shared.

Before you ask

No surprises, no learning curve.

You choose where it validates

In browser mode the file is processed on your own machine and never uploaded. Prefer the cloud? That's your call, on every run.

Nothing to install

It runs in the browser. Open it, build, validate — no setup, no IT tickets.

Useful from minute one

If you can describe how your data should look, you already know how to use it. There's no manual to study.

Blockema asking where to validate the file: in your browser or in the cloud

Pricing

Start free. Upgrade only if you need to.

To get going

Free

€0

Forever. No card.

  • Unlimited block schemas
  • Validation in your browser
  • Error hotspots and history
Start free

Pro

€12 / month

When validating is part of your week.

  • Everything in Free
  • Cloud validation for large files
  • Shared spaces with your team
Try Pro

Build your first schema in five minutes.

No card, nothing to install. If it doesn't click, close the tab.

Start free