About Marquo and how we test it

Who makes Marquo

Marquo is made by {developer}. Version 1.0 was built in October 2026 for iPhone with iOS 26 or later. Questions, bug reports and corrections to this site go to {email}.

What the app does

• Signatures and initials drawn, typed in a handwriting font, or photographed on paper, with an optional Face ID lock.
• Text, dates, checkmarks and crosses anywhere on the page, with move, resize, undo and redo.
• PDF form fields: text fields, checkboxes, radio buttons.
• Blank lines and boxes found on flat forms, with labels read in English, Spanish and Russian, and Fill my details.
• PDF, Word (.docx, .doc), RTF, photos, screenshots and camera captures as input; a PDF as output.
• Add, delete and rotate pages; lock fields at export; a password on the PDF with Pro.

How we test

• October 26, 2026: the document engine passed its automated tests on a Mac (154 tests), including signing, form fields and Word conversion.
• October 26, 2026: IRS Form W-9, revision March 2024, all 23 fields found, typed values and a checkbox exported locked and unlocked (automated tests).
• October 26, 2026: blank finding on three synthetic forms in English, Spanish and Russian, all three filled end to end, and six real documents checked by eye.
• October 26, 2026: app tests in the iPhone simulator, 41 unit tests and 20 interface tests, including the sample form, autofill, signature and export checked down to the pixels of the PDF.
• October 26, 2026: sharing a photo from Photos to Marquo in the simulator opened it in the editor.

What is not tested yet

• Accuracy of blank finding on a large set of real forms. We publish no percentage until that test is done.
• The built-in iOS tools on the same documents, which is why comparison tables say not tested.
• Official forms other than W-9.
• Dropdown lists in PDF forms, which version 1.0 does not support.

If something on this site does not match what you see in the app, write to {email} and we will correct the page. See also the privacy policy and support.