eValidator vs ONE Changi
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
eValidator
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The eValidator is created to assist users to validate the authenticity of the physical/hardcopy of digitally-signed PDF documents that use Pos Digicert’s Digital Signing Solution. The QR code embedded on these documents can only be read by eValidator. eValidator allows users to validate the authenticity of physical/hardcopy PDF documents that are digitally-signed using Pos Digicert’s Digital Signing Solution and detect any tampering. Contact us now for further details on our eValidator.
ONE Changi
Stay informed about Changi Airport community news, access e-learning materials, and discover inspiring stories. Earn exclusive rewards for your engagement.
- Airport community news updates
- E-learning resources access
- Inspiring ground stories
- Exclusive rewards program
- Engagement features
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Connect, learn, and engage with friends at Changi Airport! With ONE Changi, you can stay up to date with the latest news in the airport community, gain access to a range of e-learning resources, and be inspired by stories on the ground – all while earning exclusive rewards!
Screenshots
Verdict
The clearest difference is update cadence: ONE Changi at every 3 weeks against eValidator's every 22 months. 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
Both are free to download. Neither carries in-app purchases, so what you see is what you pay.
eValidator ships an update every 22 months, ONE Changi every 3 weeks. The most recent releases landed on September 10, 2026 and September 17, 2026 respectively.
| Parameter | eValidator | ONE Changi |
|---|---|---|
| Price | Free | Free |
| Positive reviews | — | 100.0% of reviews |
| Update frequency | Every 22 months | Every 3 weeks — better |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | — | Free |
| Devices | iPhone, iPad, iPod — better | iPhone, iPod |
| Requires iOS | 15.6 | 15.5 — better |
| Further details — not scored | ||
| Size | 20 MB | 83 MB |
| Age rating | 4+ | 4+ |
| Developer | POS DIGICERT SDN. BHD. | Changi Airport Group (Singapore) |
In-app purchases
eValidator
No in-app purchases
ONE Changi
No in-app purchases
