OPA App Official vs Black Walnut
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
OPA App Official
Easily order your favorite Greek dishes for pickup or curbside. Join the loyalty program to earn points and get free treats. Send gift cards and access exclusive promotions.
- Order Greek food for pickup
- Curbside and to-go options
- Loyalty rewards program
- Earn points for free treats
- Send gift cards
- Exclusive in-app promotions
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With the Niko Niko's OPA app, it's never been easier to satisfy your Greek food cravings. From Greekfast (looking at you, breakfast pita) to our classic baklava for dessert, our to go app lets you skip the line and order takeout for curbside or to-go pick up. Be part of the Niko Niko’s family and get 100 points!! How? Just download our app and join our Loyalty rewards program! We LOVE our loyal customers, now more than ever! Earn points with each app order and receive FREE Greek treats. Gift Cards: Sharing Niko Niko's is the best way to anyone's heart. Easily send a Niko Niko's gift card to other Greek foodies through our app and keep the party going! Exclusive Access: Enjoy special in-app promotions and coupons while staying in the know about all of our daily specials. Download the app and get ready to shout OPAAA!
Black Walnut
This app allows you to join a loyalty program to earn points and track rewards at your favorite restaurant. You can find locations, view menus, manage your account, and redeem points for special offers. It also lets you add value to gift cards and check in for points with your order.
- Earn points for rewards
- Find nearby locations
- View menus
- Check account balances
- Redeem points for rewards
- Add value to gift cards
- Check in for points
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If Black Walnut is your favorite place for breakfast, lunch or dinner, you'll love using this app to earn points and keep track of rewards when you join our loyalty program. Download it today for free and you’ll be able to: • Join Black Walnut Loyalty to start earning points for rewards • Find a Black Walnut that’s closest to your location • Check out our menus • View your account balances and details • Exchange your points for rewards • Add stored value to your gift card • Check in to let us know you’ve arrived and get points with your order
Screenshots
Verdict
OPA App Official and Black Walnut both sit at 4.8 stars, but that hides the real split: 100% of Black Walnut's written reviews are positive against 56% of OPA App Official's. Black Walnut also leads on update cadence (every 6 months vs every 34 months). OPA App Official's advantage is ads (none vs shown) and ratings volume (450 vs 22). On price, rating, 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.
OPA App Official holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: OPA App Official has 450 ratings behind it against 22, so its average is the more settled of the two. Written reviews complicate that: 56% of OPA App Official's written reviews are positive against 100% of Black Walnut's, so the app with the better star average is not the one people write more warmly about.
OPA App Official ships an update every 34 months, Black Walnut every 6 months. Both last shipped on October 24, 2026.
| Parameter | OPA App Official | Black Walnut |
|---|---|---|
| Price | Free | Free |
| Rating | 4.8 (450 ratings) — better | 4.6 (22 ratings) |
| Positive reviews | 56.3% of reviews | 100.0% of reviews — better |
| Number of ratings | 450 — better | 22 |
| Update frequency | Every 34 months | Every 6 months — better |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPod |
| Requires iOS | 13.0 | 13.0 |
| Further details — not scored | ||
| Size | 76 MB | 152 MB |
| Age rating | 4+ | 4+ |
| Developer | Niko Niko's Restaurants, LLC | Paytronix Systems Inc |
Customer experience
OPA App Official
Black Walnut
Bugs and requests
OPA App Official
Reported bugs
6 issues- App forces users to do things that are not allowed
- Payment card information is not saved correctly
- 2 of 3 locations always show closed in the app
- Waiting on verification email for days
- Cannot resend codes or create a new sign-in
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- No way to contact tech or customer support
Requested features
4 requests- Ability to go back and enter loyalty code if forgotten
- Option to enter loyalty code from a receipt
- Add Apple Pay support
- Allow auto-population of stored credit cards
Black Walnut
Not enough reviews yet to summarise bugs or requests.
In-app purchases
OPA App Official
No in-app purchases
Black Walnut
No in-app purchases
Questions
Is OPA App Official free?
Is Black Walnut free?
Which has better reviews, OPA App Official or Black Walnut?
Do OPA App Official or Black Walnut have ads?
Which is updated more often, OPA App Official or Black Walnut?
Other comparisons
