Contour lines plugin — OsmAnd

Review by eFreeware

A standard road map flattens the world. It shows where the paths are, but not how steeply the ground rises between them, which is exactly the information that matters when a route climbs a ridge or drops into a valley. The Contour Lines plugin for OsmAnd exists to fill that gap, overlaying elevation lines and an optional shaded relief layer on top of the maps you already use.

It is made by OsmAnd, the developer behind the OsmAnd navigation app itself, and it works as an add-on rather than a standalone product. If you do not already use OsmAnd, this plugin is not for you. If you do, it turns the app into something closer to a topographic reference tool for hiking, cycling and general terrain reading.

The app carries a $38.99 price, with no ads and no in-app purchases. It has been on Google Play since December 2012 and holds a 3.8 average across more than 2,100 ratings. That is a respectable but not glowing score for a paid plugin, and it is worth thinking about what you are actually buying before you commit.

What the contour layer adds to a map

The plugin centers on topographic maps that stay detailed at any zoom level. Contour lines mark points of equal elevation, so you can read the shape of the land: how a hillside curves, where a slope steepens, whether a plateau edge is a gentle roll or a sharp drop. The developer describes the detail as holding up at any zoom level, which is the kind of claim that matters most when you are planning a route on a small screen.

For anyone walking or riding in hill country, this changes how a route reads. A path that looks like a straight line on a plain map can turn out to be a series of switchbacks up a steep face, and contour lines make that visible before you set out. The same applies to planning a loop that avoids the worst of a climb, or checking whether a viewpoint sits on a summit or halfway up a slope.

The maps are described as offline topo maps. For anyone heading beyond reliable signal, that is the point of the whole exercise.

Hillshade and the 3D terrain layer

On top of the contour lines, the plugin offers a hillshade layer that renders the terrain with a three-dimensional look. Where contour lines are precise but abstract, hillshade is intuitive: ridges catch light, valleys fall into shadow, and the landscape reads at a glance rather than requiring you to count lines.

The two layers complement each other well. Hillshade is good for a quick sense of the shape of a region, while contour lines give you the numbers behind that impression. The developer presents the hillshade as an optional addition to the topographic maps, so you can work with contour lines alone if that is what you prefer.

This is the part of the plugin that will appeal to people who like studying terrain for its own sake, not just as a means to a route. The app is pitched at hikers, tourists, cyclists and topography enthusiasts, and the hillshade is what makes the last group feel addressed.

Where the elevation data comes from

Coverage spans 70 degrees south to 70 degrees north. That range takes in most of the populated and walkable world, though it stops short of the extreme polar latitudes.

The measurements are drawn from two satellite sources. One is SRTM, the Shuttle Radar Topography Mission, and the other is ASTER, an imaging instrument carried on NASA's Terra satellite. ASTER is a joint project of NASA and two Japanese bodies, METI and Japan Space Systems.

Knowing the provenance matters if you rely on elevation for anything beyond casual planning. These are established public datasets rather than proprietary survey work, and the plugin is essentially a well-built way of getting them into a navigation app you already trust.

Getting the maps onto your device

Setup runs through OsmAnd rather than through this plugin on its own. The developer's instructions are to open OsmAnd, go to Download maps, choose the country you need, and then select the Contour Lines or Hillshade option for it. The data is downloaded per country.

Once the data is on the device, the layer has to be switched on in two places: activate the plugin under OsmAnd's Plugins section, then enable the Contour Lines or Hillshade layer under Configure map. Both steps are described by the developer.

A September 2026 update brought the plugin up to Android 15, as Google Play now requires. That is a maintenance note rather than a feature, but it is a sign the add-on is being kept current with the platform it runs on.

Who gets real value from it

The clearest fit is someone who already navigates with OsmAnd and regularly walks, rides or drives through terrain where elevation matters. If your routes are mostly flat and urban, the contour layer adds little that a normal map does not already give you, and the price is steep for a feature you would rarely consult.

The second group is the map enthusiast: someone who enjoys reading terrain, comparing valleys, or simply seeing a familiar area rendered as a relief model. The hillshade layer is what makes this plugin interesting to that audience, since it turns a functional tool into something closer to a reference atlas.

For tourists planning a trip that involves mountain roads or long trails, this is worth considering. Being able to check a climb is worth more than any single feature on the list.

A specialist add-on for terrain-aware navigation

The Contour Lines plugin does one job and does it in a focused way: it puts elevation detail and shaded relief into OsmAnd. The price of $38.99 is high for an add-on, and the 3.8 rating suggests a fair number of users have found something to grumble about, though the app has no ads and no in-app purchases to complicate the picture.

If you use OsmAnd and spend time in hill country, the combination of offline topographic maps, zoomable contour detail and an optional hillshade layer is a coherent package. If you are not already in the OsmAnd ecosystem, or if your travels rarely involve a gradient, the cost is hard to justify.

My recommendation is narrow but confident: this is for existing OsmAnd users who want to read terrain, not for anyone looking for a general-purpose mapping app. The satellite-derived data and the long history on the platform give it credibility; the price and the middling rating are the two things to weigh before buying.

What's new

- Updated the Contour lines plugin to target Android 15 (API level 35), meeting Google Play requirements.