What is the best alternative to Visit London - Official Guide on iPhone?

Visit A City, S tier, #1 in city guides.

Is there a free alternative to Visit London - Official Guide?

Yes: Visit A City (S tier, #1) is free to download, with in-app purchases.

Yes. 1 app ranks above it in city guides: Visit A City (#1).

Visit London - Official Guide is B tier, #2 of 6 in city guides. Here is everything that competes with it on iPhone, in tier order.

1
Visit A CityShigher tier
Free + IAP · ★ 4.8 · 14,800 ratings · score 94
Travel app for planning a city sightseeing trip with an itinerary, a sights guide, and tour and activity booking.
3
Big Bus Tours: Hop On, Hop OffB
Free · ★ 4.8 · 24,434 ratings · score 70
Companion app for Big Bus hop-on hop-off tours in more than 25 cities: bus tracking, maps, stop details and tickets.
4
POPGuideC
Free download · ★ 4.3 · 3,915 ratings · score 64
Self-guided sightseeing app with offline maps, walking and transit routes, and audio commentary for over 150 cities.
5
The Villages® AppD
Free · ★ 4.6 · 13,179 ratings · score 58
Official app for The Villages community with GPS navigation, HomeFinder, events, local directory, and live streams.
6
Discover LA - Official GuideF
Free download · ★ 4.7 · 2,258 ratings · score 44
Official Los Angeles guide to daily events, dining, activities, lodging, Metro directions and Wi-Fi hotspots.

What is the best alternative to Visit London - Official Guide on iPhone?: Visit A City, S tier, #1 in city guides.
Is there a free alternative to Visit London - Official Guide?: Yes: Visit A City (S tier, #1) is free to download, with in-app purchases.
Does anything rank above Visit London - Official Guide?: Yes. 1 app ranks above it in city guides: Visit A City (#1).