Comparison

AST UPAS vs StudySync

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head

AST UPAS

Access Sensor Technologies

★ 5.03 ratingsView app →

About

AST UPAS

Features

Read full description

Use this application to set sampling parameters for Access Sensor Technologies’ Ultrasonic Personal Aerosol Sampler (UPAS). Parameters that can be adjusted using this application include the name, cartridge id, start time, duration, flow rate, and duty cycle for each filter sample. Make sure any mobile device that you will use to program the UPAS is running iOS 12 or later.

About

StudySync

This mobile application serves as the companion for a specific research study. Participants must be pre-enrolled to use its features. It is developed by the Snyder Lab at Stanford University.

Highlights

Research study participation
Onboarding required
Stanford University developed
Mobile companion app

Features

Read full description

This is the mobile app for StudySync. Participants must be onboarded from beforehand. StudySync is developed by the Snyder lab at Stanford University.

Screenshots

AST UPAS3 screens

StudySync4 screens

Verdict

The call

The clearest difference is update cadence: StudySync at fortnightly against AST UPAS's every 3 months. AST UPAS's advantage is iOS requirement (12.0 vs 18.5). On price, ads, in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

AST UPAS ships an update every 3 months, StudySync fortnightly. The most recent releases landed on May 16, 2026 and September 16, 2026 respectively.

Scorecard2 real differences · 7 level

AST UPAS versus StudySync: the parameters behind the verdict, then further details
Parameter	AST UPAS	StudySync
Price	Free	Free
Rating	—	5.0 (3 ratings) — better
Number of ratings	—	3 — better
Update frequency	Every 3 months	Fortnightly — better
Ads	No	No
In-app purchases	No	No
Monetization	—	Free
Devices	iPhone, iPad, iPod — better	iPhone, iPad
Requires iOS	12.0 — better	18.5
Further details — not scored
Size	11 MB	43 MB
Age rating	4+	17+
Developer	Access Sensor Technologies	Stanford University

In-app purchases

None

AST UPAS

No in-app purchases

None

StudySync

No in-app purchases

Questions

Is AST UPAS free?

AST UPAS is free to download, with no in-app purchases.

Is StudySync free?

StudySync is free to download, with no in-app purchases.

Do AST UPAS or StudySync have ads?

Neither AST UPAS nor StudySync shows ads.

Which is updated more often, AST UPAS or StudySync?

AST UPAS ships an update every 3 months, and StudySync fortnightly. Most recently, AST UPAS was updated on May 16, 2026 and StudySync on September 16, 2026.