Locked In!
A+
On the App StoreBoth A+ cores and all nine domains of the IT support foundation.
Apps for iPhone and iPad, from a one-person studio.
Certification exam prep, university-length courses, field tools for the trades, and standalone apps for cycle tracking, rental inspections, reef tanks and more.
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See all collections
Selected apps
Cycle Cipher
On the App StoreOn Google PlayA private cycle tracker that works offline, with no account, developer sync, ads or tracking.
Roomprint
On the App StoreOn Google PlayDocument your rental from move-in to move-out, then export the PDF.
Water Operator
On the App StoreOn Google PlayThe formula sheet is supplied at the exam. Picking the right one is the part that fails people.
Unredacted
On the App StoreComing soon to Google PlayContact to the drone war, including the parts that get left out.
Fractured: US
On the App StoreComing soon to Google PlayA composite index tracking U.S. civil-conflict risk, with a Home Screen widget.
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Four collections
Each collection page lists all of its apps, including the ones still in development.
- 01Locked In!Offline study apps, one per certification or disclosed legacy exam version. Each app's page states its content scope, and every app pairs short lessons with original practice questions, flashcards and on-device review tools.19 apps
- 02Curriculum SuiteUniversity-length courses, one subject per app: about a hundred lessons across four years. Lessons cite their evidence, and where researchers disagree, the course sets out each position.10 apps
- 03Studio AppsApps outside the studio's three series: reference tools, everyday utilities and an arcade game. None of them asks you to create an account.11 apps
- 04GaugeField calculators and certification prep for the skilled trades. The calculators and reference tables in every Gauge app stay free; exam prep is a one-time unlock.3 apps
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Android
The studio has 19 apps on Google Play and is bringing 3 more to Android.
On Google Play
LiminalPhilosophy
CognitaPsychology
CodonBiology
ScarcityEconomics
BiomeEnvironmental Science
World WarsThe World Wars
Civil WarThe American Civil War
Cold WarThe Cold War
Puerto RicoHistory of Puerto Rico
CivBitesU.S. Civics
CriticaIslamic Source Criticism
DecanonThe Bible, Annotated
TanksmithReef Tank Logbook- RoomprintRental Documentation
- Cycle CipherPrivate Cycle Tracking
Stormbreak SquadronPixel Art Arcade Shooter- Water OperatorWastewater Treatment Operator certification
A&P MechanicFAA Aviation Mechanic General, Airframe and Powerplant knowledge tests
Welding InspectorAWS Certified Welding Inspector (Parts A, B and C)
Coming soon to Google Play
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About the studio
Stack Trace Studios is an independent app studio run by one developer, who designs and builds every app and answers the support email.
Each product page says what works offline, what stays on your device, and what any paid unlock includes.
Contact the studio
For help with an app, start at the support directory. For press or anything else, email the studio.
OmarAppSupport@gmail.com