Opp App vs Check
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Opp App
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With the Opp App, you can contribute to topics within your team and organisation. Answer questions, share ideas and see what matters to the group. With the Opp App you can: • join dialogues using the OPP code in your invitation; • answer questions and share ideas; • view results when they are available; • follow news and updates; • use multiple domains on one device; • see where you left off. Have you been invited? Enter your OPP code to open the relevant domain. The organiser manages its content and available dialogues. Information and support: https://www.letsopp.com
Check
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With Check-in Mobile, check-in is fast, secure and streamlined. No hassle, no delays – just a smooth experience for both you and your guests. Guests receive a unique access code in advance, with which they can easily be checked in via the app. You have immediate insight into who is already inside. A smooth check-in without additional equipment, rental tables or printers. You can fully focus on what really matters: creating a successful event.
Screenshots
Verdict
Opp App and Check are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
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.
Opp App ships an update every 3 months, Check every 4 months. The most recent releases landed on October 24, 2026 and October 19, 2026 respectively.
| Parameter | Opp App | Check |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months — better | Every 4 months |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 16.4 | 15.5 — better |
| Further details — not scored | ||
| Size | 28 MB | 38 MB |
| Age rating | 4+ | 4+ |
| Developer | The OppCompany B.V. | aanmelder.nl |
In-app purchases
Opp App
No in-app purchases
Check
No in-app purchases
