Test your assumptions,
and everything recalculates
Every assumption becomes a slider, a dropdown, or a switch.
Change it: everything recalculates instantly, and every version stays in your version history.
Controls, not cells
To decide, you need to be able to try things out. Your assumptions become sliders, dropdowns, or switches, and everything recalculates instantly.
3.0%
New hires in Q2
Include bonuses
2027 total cost
$2,196,798
Variance to budget
−$3,202
See what changed, in color
After an edit, you want to know what it touched. See at a glance what was added, changed, or removed.
Budget by department
| Headcount | Budget | |
| Sales | 6 | $510,000 |
| Marketing | 4 | $345,000 |
| Support | 5 | $360,000 |
| R&D | 8 | $740,000 |
| Data | 2 | $180,000 |
| Total | 20 | $1,775,000 |
AddedChangedRemoved
Project settings
| Rate | 140% |
| Effective date | 03/01/2027 |
| Status | Archived |
“Archived” isn’t an allowed value
Inputs that stay valid
A percentage between 0 and 100, a date within the year, a choice from a list: Summia flags any input that falls outside the limits and rejects any choice that isn’t on the list.
A complete version history
You can try anything without worrying. Every version is saved and named, and you can go back whenever you want.
Version history
Added bonuses5 minutes ago · current
Slider for across-the-board raise2 hours ago
Version from Oct 12, 2:32 PMyesterday
2027 payroll costs3 days ago
Restore this version