Video to Photo: Save Frames review — full-resolution stills from iPhone video
A free iOS app that saves a video frame at its native resolution, up to 8K, instead of a 3.2 MP screenshot. Tested again...
Image Converter: Offline Batch review — convert photos without uploading them
A free iPhone converter that turns HEIC, RAW, WebP, AVIF and JPEG XL into whatever you need, entirely on the device.
Birthday Counter: Days Until review — a free birthday countdown that never leaves your phone
A free iPhone and Android birthday countdown with unlocked widgets, exact age and days lived, running entirely offline w...
Laundry Symbols & Care Labels review: an offline scanner for every ISO care symbol
A free Android app that scans a clothing care label and explains all 44 ISO care symbols offline, with no account, no ad...
Epub Reader for Dyslexia review: an offline reader that tints syllables
A free offline EPUB, FB2, MOBI, AZW3 and TXT reader for iPhone and Android that tints every second syllable in 10 langua...
Dog Whistle Trainer review: does a phone dog whistle actually work?
A free offline whistle, clicker and 50+ command cards for iPhone and Android, with three guided programs and no data col...
Scan to PDF: Sign & Redact review: the scanner that really deletes what you black out
A free offline scanner whose redaction removes the text instead of hiding it, with Bates numbering, AES-256 exports and ...
Moon Phase Calendar review — an offline lunar calendar for gardeners, anglers and astrophotographers
A free offline moon calendar for iPhone and Android, 1900–2100, with solunar and biodynamic days. Tested against three r...
True Ring Size review — how accurate is a phone ring sizer for ordering online?
A free offline ring sizer that calibrates against a bank card and converts between six country systems. Tested against t...
String Tuner: Violin and Cello review 2026
A free, offline iPhone tuner built for bowed strings: 47 instruments, a 392-466 Hz reference pitch and no paid tier.
Flag Quiz: Europe & World review — can a free offline app teach you all 254 flags?
A free offline flag quiz with 254 flags, 7 modes and spaced repetition, compared with three real App Store rivals.
Schengen 90/180 Counter review 2026
A free iPhone counter for the Schengen 90/180 rule: a rolling-window heat-map, a Ghost Trip planner, 44 languages and no...
Caffeine Quit Streak Tracker review — a free iOS counter for a hard caffeine stop
A free, iOS-only caffeine streak counter with withdrawal phases and a savings total, weighed against three live alternat...
Tickfield Inspection Checklist review — can a free app make inspection photos hard to dispute?
A free offline inspection app that burns the time, time zone and GPS position into every photo and hashes it with SHA-25...
Chess Clock: Board and Go Timer review 2026
A free offline clock for chess, go, shogi and board games: eight time-control families, 25 presets and 2 to 6 players.
EarCheck: Hearing Test review 2026
A free iOS sound game that guesses your hearing age from the highest tone you catch, measured against three live alterna...
Latest Articles
How to Test Your Hearing at Home
What each home hearing check actually measures, which one comes closest to a clinic, and where a tone game honestly fits...
How Often Should You Get Your Eyes Checked?
The age and risk thresholds that set the interval, what a comprehensive exam actually covers, and where a phone chart ge...
How Many Hours a Day Should Grow Lights Be On?
Why 12 to 18 hours is the usual answer, how the daily light integral decides the number, and what a 2026 lettuce study f...
Can You Use a Chess Clock App in a Tournament?
Why a chess clock app is fine for club nights and practice but not for a FIDE-rated game, and how to set a phone up prop...
Is FLAC actually worth it over MP3 on a phone?
When lossless really changes what reaches your ears on a phone, when it only costs storage, and how to tell which case y...
What Does 20/20 Vision Actually Mean?
20/20 is normal acuity, not perfect eyesight, and its metric equivalent is 6/6. What the fraction measures, and where 20...
How Far Should a Grow Light Be From Your Plants?
Why grow light distance has no fixed answer, what published trials use, and how to set the height from a measured PPFD r...
How to Write a Site Inspection Report
What a site inspection report must contain, when the law requires one, who signs it, how long to keep it, and which app ...
How to prove when and where a photo was taken
What a photo's own metadata can and cannot prove, and the capture method that makes the date and the place hard to dispu...
How to get gapless playback on your phone
The gap between tracks is in the file, not the phone. The sourced numbers behind MP3 padding, and the formats and settin...
How to calculate your daily caffeine intake in milligrams
A worked method for turning coffee, tea, cola and energy drinks into a daily caffeine intake in milligrams, and the ceil...
Which EU countries don't count towards the Schengen 90/180 limit?
Ireland and Cyprus are in the EU but outside the Schengen area, so days there do not count towards your Schengen 90-day ...
How to count your 90 days in 180 in the Schengen area
The official count-back method for the Schengen 90/180 rule, why arrival and departure days both count, and what the Ent...
How to memorize all country flags
254 flags, 1,778 reviews, 20 a day for three months: the schedule that actually works, and the sourced evidence behind e...
How to tell similar flags apart
Three axes in a fixed order — ratio, colour order from the hoist, and the charge — plus the sourced specs that separate ...
Should I tune to 440 or 442 Hz?
442 Hz is 7.9 cents above 440 and makes two beats a second against it. When the number matters, and when it does not.
How to tune a violin with your phone
Bow one string at a time and match 440.00, 293.66, 196.00 and 659.26 Hz. The full method, and which app to use.
What Light Is Best for Applying Makeup?
Neutral daylight near 6500 K with high colour rendering. What kelvin and Ra mean, and how to check a look under three to...
How to find someone's ring size without them knowing
A ring they already wear is the only thing you can actually measure. Here is how to read it in under a minute, and which...
How to measure your ring size at home
Ring size is one number: the inner circumference of a band that fits. Here is how to get it at home to within a millimet...