Hi Goodnotes Team!

I would love to see a feature that allows users to save frequently used formulas and quickly reuse them through autocomplete, with the ability to enter or change variables directly.

1. Custom Formula Autocomplete

For example, I could save the following formula:

BP = x₁ + g + 2kr

Whenever I type "BP", Goodnotes would automatically suggest the complete formula, allowing me to insert it by pressing Tab or accepting the suggestion.

Ideally, users could create their own library of formulas for different subjects or courses.

2. Interactive Variable Input

This is the part I would find particularly useful.

After inserting a saved formula, I could activate a shortcut or select an option to enter values for its variables.

For example:

• Goodnotes asks: x₁ = ?
• I enter a value and press Enter.
• Goodnotes automatically moves to g = ?
• Then k = ?
• Finally r = ?

Once all values are entered, the formula would automatically update with those values.

Ideally, there would also be an option to calculate the final result.

3. Editing Variables in Existing Formulas

It would also be useful to select an already inserted formula and modify individual variables without having to enter everything again.

For example, if I wanted to change only the value of k, I could select that variable, enter a new value, and have the formula and calculated result update automatically.

4. Two Input Methods

I imagine two different ways of working with the feature:

• Sequential Input: Goodnotes guides the user through each variable, using Enter to advance to the next.
• Quick Edit: Users can directly select individual variables to modify them.

Why I Think This Would Be Useful

As a mechanical engineering student, I frequently work with equations that need to be reused with different values. Having to repeatedly rewrite formulas and manually substitute variables takes unnecessary time.

A feature like this would combine formula autocomplete, reusable templates, and interactive calculations in one workflow, making Goodnotes much more powerful for engineering, mathematics, physics, and other technical subjects.

I think this could be a valuable addition to Goodnotes, especially for students who work with mathematical formulas regularly.

Thank you for considering the suggestion!