Sign PDF: Fill & Scan Docs
Sign and fill PDF forms, scan paper to PDF, merge, split and compress – offline.
stillmeasure. apps
Android tools
Four free tool apps for your Android phone – for documents, photos and noise.
Android tools
Photo Gallery: Albums & Vault
Photo and video gallery with albums, a PIN vault, editor and storage overview.
Sound Meter: Decibel dB Level
Decibel meter with live gauge, min/max/average, calibration, history and PDF reports.
UpNDown: Gallery Cleaner
Swipe down to delete, up to keep – sort a full camera roll with a trash you can restore from.
Which app for which job
- Sign a PDF, fill in a form or scan a letter: Sign PDF: Fill & Scan Docs
- Browse photos, make albums, hide private pictures: Photo Gallery: Albums & Vault
- Measure how loud it is: Sound Meter: Decibel dB Level
- Sort a full camera roll by swiping: UpNDown: Gallery Cleaner
From the blog
Android how-to
How to Sign a PDF on Android Without Printing or Scanning
Sign a PDF on your Android phone without printing: draw your signature, fill in form fields, scan paper pages and share the signed file from your phone.
Oct 14, 2026
Android how-to
How Loud Is Too Loud? A Plain Guide to Decibels and Phone Meters
How loud is too loud? See the NIOSH and WHO noise limits, typical decibel levels, and how to measure and calibrate a decibel meter app on Android.
Oct 14, 2026
Android how-to
How to Hide Photos on Android: Vault Apps and Built-In Options Explained
How to hide photos on Android: Google Photos Locked Folder, Samsung Secure Folder, the .nomedia trick and gallery apps with a PIN vault compared.
Oct 14, 2026
Android how-to
Free Up Storage on Android: Duplicates, Screenshots & Big Videos
Free up storage on Android step by step: clear app cache and downloads, delete duplicate photos, screenshots and big videos, and empty the trash.
Oct 14, 2026
Android how-to
How to Clean Up Your Photo Gallery on Android: Swipe to Sort
Clean up your photo gallery on Android step by step: remove screenshots, similar shots and big videos, then sort the rest by swiping, with a trash to undo.
Oct 14, 2026
Questions and answers
Are the apps free?
Yes, all four apps are free to download from Google Play. Sign PDF has no ads; Photo Gallery, Sound Meter and UpNDown show ads, which you can remove with an in-app purchase.
Do the apps upload my files?
No. Sign PDF works fully offline, and the gallery apps work with the photos stored on your phone without uploading them. Each app page links to its privacy policy.
Are the apps available for iPhone?
No, the apps are made for Android and are available on Google Play.