Sustainability Rewards vs UnDoubt
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Sustainability Rewards
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Sustainability Rewards is an engagement program, offering a gateway to improve sustainable and wellbeing behaviours at the University of Edinburgh through a wide range of fun activities. With this app, you will be able to earn Green Points for your actions under key themes relating to sustainability and wellbeing. You can make submissions or opt into weekly activities to earn Green Points, climb the leader board and win vouchers.
UnDoubt
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UnDoubt is a simple, person-first verification app built on secure cryptography. It helps you confirm who youβre really communicating with by verifying requests in real time, before risky actions are taken. Real-time Verification β¨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 β¨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 β¨Your personal information isnβt 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
Verdict
The clearest difference is update cadence: UnDoubt at every 3 weeks against Sustainability Rewards's every 2 months. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
Sustainability Rewards ships an update every 2 months, UnDoubt every 3 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.
| Parameter | Sustainability Rewards | UnDoubt |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 2 months | Every 3 weeks β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad, iPod β better | iPhone, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details β not scored | ||
| Size | 66 MB | 85 MB |
| Age rating | 4+ | 4+ |
| Developer | Green Rewards Ltd | LastingAsset LIMITED |
In-app purchases
Sustainability Rewards
No in-app purchases
UnDoubt
No in-app purchases
Questions
Is Sustainability Rewards free?
Is UnDoubt free?
Do Sustainability Rewards or UnDoubt have ads?
Which is updated more often, Sustainability Rewards or UnDoubt?
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