Comparison

Castle Explorer vs Synodoss

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

Head to head

Castle Explorer

20,000 castles to discover

Meet People, Groups & Events

Free

🌐 Social Networking

No ratingsView app →

About

Castle Explorer

Features

Read full description

The only application on smartphone that references nearly 20,000 castles in Europe. Participate and publish new castles or photos of these magnificent buildings.

About

Synodoss

Features

Read full description

Synodoss is an app for travel, local meetups, and connecting with people through events and groups. Connect over tastes. Join or create groups anywhere, and meet people who share your interests. Discover exhibitions, pop-ups, and events happening nearby, then find people to go with. Connect with new friends who share your taste, interests, and vibe. Terms of Use: https://synodoss.com/terms End User License Agreement: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://synodoss.com/privacy

Screenshots

Castle Explorer4 screens

Synodoss4 screens

Verdict

The call

The clearest difference is in-app purchases: Castle Explorer at none against Synodoss's 4. Castle Explorer also leads on iOS requirement (16.6 vs 26.4). On price, update cadence, ads 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Synodoss sells 4 in-app purchases, starting at $18.99 per 7 days. Castle Explorer asks for nothing beyond the download.

UpkeepUpdate frequency

Castle Explorer ships an update weekly, Synodoss every 4 days. The most recent releases landed on October 14, 2026 and October 26, 2026 respectively.

Scorecard2 real differences · 4 level

Castle Explorer versus Synodoss: the parameters behind the verdict, then further details
Parameter	Castle Explorer	Synodoss
Price	Free	Free
Update frequency	Weekly	Every 4 days — better
Ads	No	No
In-app purchases	No — better	Yes
Devices	iPhone	iPhone
Requires iOS	16.6 — better	26.4
Further details — not scored
Size	100 MB	35 MB
Age rating	4+	17+
Developer	richard prandini	VOWI

In-app purchases

None

Castle Explorer

No in-app purchases

4 purchases

Synodoss

Subscriptions4

Synodoss Plus · 1 Week$18.997 Days
Synodoss Plus · 1 Month$49.991 Month
Synodoss Plus · 6 Months$99.996 Months

Show 1 more

Synodoss Pro · 1 Year$139.991 Year

Questions

Is Castle Explorer free?

Castle Explorer is free to download, with no in-app purchases.

Is Synodoss free?

Synodoss is free to download, with in-app purchases available.

Do Castle Explorer or Synodoss have ads?

Neither Castle Explorer nor Synodoss shows ads.

Which is updated more often, Castle Explorer or Synodoss?

Castle Explorer ships an update weekly, and Synodoss every 4 days. Most recently, Castle Explorer was updated on October 14, 2026 and Synodoss on October 26, 2026.