> For the complete documentation index, see [llms.txt](https://docs.notionapps.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.notionapps.com/release-notes/16-sep-2026-release.md). # 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. {% hint style="info" %} Earlier updates For nested list filters, URL parameter lists, and Reuse / Detach, see the [15 Sep 2026 Release](https://docs.notionapps.com/release-notes/15-sep-2026-release). {% endhint %} *** ### 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](https://docs.notionapps.com/how-to-guides/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. ``` {% hint style="success" %} Start here Open **Databases** → **Calculated properties**. Leave **Recalculate in NotionApps** on when the switch is clickable. Publish, then open live Home twice — the number should stay computed, not snap back to `0` / `0/600`. {% endhint %} *** ### 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](https://docs.notionapps.com/troubleshooting/some-rollup-properties-do-not-show-up-in-the-app-builder), then Sync | End users do not see a formula editor. They still see one read-only number. *** ### Related * [Recalculate calculated properties](https://docs.notionapps.com/how-to-guides/recalculate-calculated-properties) * [Formulas & Rollups](https://docs.notionapps.com/screens-and-components/formulas-and-rollups) * [Why are my rollups showing zero or an incorrect value?](https://docs.notionapps.com/troubleshooting/why-are-my-rollups-on-notionapps-showing-zero-0-value-or-an-incorrect-value) * [Reload and sync](https://docs.notionapps.com/databases/reload-and-sync) * [📢 Release Notes](https://docs.notionapps.com/release-notes) * [15 Sep 2026 Release](https://docs.notionapps.com/release-notes/15-sep-2026-release)