When comparing Lark - Personal Weight Loss Coach & 24/7 Nutritionist vs RunKeeper, the Slant community recommends RunKeeper for most people. In the question“What are the best apps to track diet and/or exercise?” RunKeeper is ranked 3rd while Lark - Personal Weight Loss Coach & 24/7 Nutritionist is ranked 11th. The most important reason people chose RunKeeper is:
RunKeeper displays your route using Google Maps and tracks distance, duration, speed, pace and calories burned. You can also input your runs manually (useful when running on treadmills) to add them to your "workout logs".
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Pros
Pro User-friendly chat interface
Lark feels like a friendly personal trainer that chats with you every day to log your exercise and meals, while providing semi-automated responses. It's easy to use and feels like having a conversation instead of filling out a form.
Pro Tracks distance, duration, speed, pace and calories burned
RunKeeper displays your route using Google Maps and tracks distance, duration, speed, pace and calories burned. You can also input your runs manually (useful when running on treadmills) to add them to your "workout logs".
Pro Simple interface
The interface is clean and easy to use.
Pro Gives audio cues
Pro Great for Interval Training
Interval lengths can be set and RunKeeper will let know when to start and stop running via audio messages.
Pro Tracks shoe mileage
You can add several pairs of shoes to this app and select which you are wearing for each activity. It will keep an overall count of a shoe's mileage to help you know when to buy new shoes.
Pro Tracks shoe mileage
You can add several pairs of shoes to this app and select which you are wearing for each activity. It will keep an overall count of a shoe's mileage to help you know when to buy new shoes.
Pro Website has detailed statistics
Stats such as top speed, speed of each interval, fastest/slowest parts of a course, etc. Where applicable, graphs and maps routes will be display for a visual representation.
Pro Add photos to your runs
To make the memorable runs easy to remember why they were memorable.
Pro Works with Pebble smartwatches
You will have to download the app both on your phone and Pebble.
Pro Can chart weight
Pro Perfect localization for interface and voice
Pro Works with Android Wear
Pro Integrates with many accessories
Cons
Con Poor database for food
While Lark recognizes simple dishes like pasta and understands various vegetables, cuisines like Chinese and Indian won't have any dishes that get recognized by Lark. Users will have to resort to trying to fit their meals into cookie cutter ingredients and the closest substitute.
Con Conversations can feel forced
Despite the app's best intentions of sounding like a person, having a conversations to log daily exercise and meals can feel inefficient and repetitive.
Con Intervals are not supported in stopwatch mode
Since this allows both "GPS" and "stopwatch" mode, and tracking several sports, it should allow you to use intervals in stopwatch mode. I would like to use intervals for treadmill running or stationary bicycle.
Con Warm-up and cool-down time are included in overall pace
Warm up and cool down are options you can toggle for a run. If you toggle them on, those are included in your overall pace calculation, but they are.
Con Warm-up and cool-down time are included in overall pace
Warm up and cool down are options you can toggle for a run. If you toggle them on, those are included in your overall pace calculation, but they are.
Con Charts don't overlay
While charts do exist for pace, elevation, and cadence, they're all independent graphs. It would be nice to see pace overlaid with elevation, as some other apps do.
Con Does not announce intervals correctly when also using audio stats
If you are using both intervals and audio stats, and then happen to occur at the same time, the stats are announced first, and then your interval announcement after. You end up starting your interval late, even though it's tracking that interval already.
Con GPS sometimes fails
The GPS sometimes fails on devices that rely on WIFI for GPS (Apple ipod touch). However, GPS can be fixed manually later.

Con Slow and heavy for old smartphones
Con Does not announce split pace properly when using kilometers
Con Doesn't optimize for WGS-84 GPS on map
The track path draw on map is wrong cause WGS-84 GPS format.
