Comparison

STA Volunteers vs UnDoubt

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

Head to head
About

STA Volunteers

Features
Read full description

The easiest way to find volunteering opportunities and get involved in the Scottish Tech Army, using your tech talents for good. You can find charity projects across the UK - search by role, tech stack or the kind of cause you want to support. Put yourself forward for a project when you're ready.

About

UnDoubt

Features
Read full description

UnDoubt is a simple, person-first verification app built on secure cryptography. It helps you confirm who you’re really communicating with by verifying requests in real time, before risky actions are taken. Real-time Verification 
Instantly authenticate who you are interacting with across voice, video, email or text. UnDoubt is your first line of defence against voice spoofing, AI impersonation, and online scams. Verify Before You Act 
Verify requests in real time before sharing information, sending money, clicking a link, or granting access. Simple and Intuitive Designed for real people, not security experts. Setup takes minutes, verification takes seconds, and the app stays out of your way until you need it. Privacy First 
Your personal information isn’t shared. Verifications happen privately without tracking or data harvesting. Grow Your Trusted Network See which contacts already use UnDoubt and verify them instantly. Invite others via a link when you need certainty, not assumptions. Free to Use UnDoubt is free to help protect you and the people who matter most. Optional premium features may be introduced later, but the core experience will always remain free. Terms of use: https://undoubt.co.uk/terms/ Privacy policy: https://undoubt.co.uk/privacy/

Screenshots

STA Volunteers4 screens
UnDoubt4 screens

Verdict

The call

The clearest difference is update cadence: UnDoubt at every 3 weeks against STA Volunteers's every 10 months. STA Volunteers's advantage is iOS requirement (13.4 vs 15.1). On price, ads, in-app purchases and device support there is nothing between them.

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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

UpkeepUpdate frequency

STA Volunteers ships an update every 10 months, UnDoubt every 3 weeks. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

Scorecard2 real differences Β· 4 level
STA Volunteers versus UnDoubt: the parameters behind the verdict, then further details
ParameterSTA VolunteersUnDoubt
PriceFreeFree
Update frequencyEvery 10 monthsEvery 3 weeks β€” better
AdsNoNo
In-app purchasesNoNo
DevicesiPhone, iPad, iPod β€” betteriPhone, iPod
Requires iOS13.4 β€” better15.1
Further details β€” not scored
Size29 MB85 MB
Age rating17+4+
DeveloperScottish Tech ArmyLastingAsset LIMITED

In-app purchases

None

STA Volunteers

No in-app purchases

None

UnDoubt

No in-app purchases

Questions

Is STA Volunteers free?
STA Volunteers is free to download, with no in-app purchases.
Is UnDoubt free?
UnDoubt is free to download, with no in-app purchases.
Do STA Volunteers or UnDoubt have ads?
Neither STA Volunteers nor UnDoubt shows ads.
Which is updated more often, STA Volunteers or UnDoubt?
STA Volunteers ships an update every 10 months, and UnDoubt every 3 weeks. Most recently, STA Volunteers was updated on November 7, 2026 and UnDoubt on November 8, 2026.

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