16 Sep 2026 Release

NotionApps can now recalculate Notion formula and rollup properties from the recipe Notion already defined. You do not type a formula. A per-field Recalculate in NotionApps toggle decides whether Home keeps our number or Notion’s page API.

What’s new at a glance

Capability	What you can do	Learn more
Calculated properties	See every formula and rollup on Databases, with a count of fields we cannot recalculate	Recalculate calculated properties
Recalculate toggle	Leave on so Home uses our eval; off = Notion’s raw page value; disabled = we cannot eval yet	Same how-to
Read-only recipe	Inspect Notion’s expression or rollup function without editing it here	Same how-to
Keep a good number	After a successful compute, published Home does not fulfill that field from Notion again	Same how-to

You do not write formulas in NotionApps.
On = our eval of Notion's recipe. Off = Notion's page leaf.
Disabled means we cannot evaluate it yet.

Features

1. Calculated properties on Databases

The Databases tab lists formula and rollup fields only. Each database shows a caption such as 3 formulas, 2 rollups — 4 cannot recalculate. Apps with no calculated properties do not show the section.

You never type a formula here. Notion still owns the recipe. Change the expression in Notion, then Sync from Notion.

2. Recalculate in NotionApps

On each evaluable field:

Toggle	Published app
On	We evaluate the recipe. Home keeps that number.
Off	Screens show Notion’s page API value.
Disabled	We cannot evaluate this recipe. Notion keeps the number. A reason names the unsupported token or missing rollup recipe.

Evaluable fields start on. Existing apps keep that default so simple prop() heals do not regress.

Status lines:

We’ll recalculate this
Using Notion’s value
Waiting on related fields
Can’t recalculate

3. What we can evaluate today

Formulas: prop(), + - * /, if(), dateBetween, and simple literals (including a /600 ratio suffix).

Rollups: sum, count, average, min, max, once the rollup recipe is loaded.

Not yet: formatDate, ifs, lets, style, map, filter, join, empty, includes, length, format, and other rollup functions. Sync can load a missing rollup recipe. Sync does not unlock those tokens.

4. Home no longer overwrites a good compute

The bug this release closes: we computed a real number, left the field incomplete, then Home fulfilled Notion’s 0 / 0/600 leaf and looked blank again.

When Recalculate is on and the compute succeeded, that field is not fulfilled from Notion again.

What makers need to change

Goal	Extra work
Keep current formula/rollup display	None if the toggle is on (the default when we can evaluate)
Trust Home for simple `prop()` math or sum/count/average/min/max	Leave Recalculate on; Publish; open live Home twice
Show Notion’s raw page value	Turn Recalculate off
Unsupported `formatDate` / `ifs` formulas	Nothing — Notion keeps the number. The reason explains why.
Missing rollup recipe	Sync from Notion, then reopen Calculated properties
Related database not shared	Grant access, then Sync

End users do not see a formula editor. They still see one read-only number.