Kasi is a running coaching app that delivers real-time audio coaching during a workout, rather than just handing runners a static plan to follow alone. Users can choose an AI-powered coach or a remote human coach who observes biometric data live and speaks instructions into the runner's ear as the workout unfolds, aiming to teach technique and pacing in the moment rather than only after the fact. Runners enter a recent race time and the app calculates target paces for different workout types, then adjusts guidance in real time. Training programs cover distances from 5K through marathon, along with menstrual-cycle-aware training and runner-specific strength work. The brand name comes from the Swahili word for speed.
Runna generates personalized running training plans for any distance from 5K to ultramarathon, adapting workouts based on a runner's goals, experience, and schedule through what it calls the Runna Engine. Plans include guidance on running form, nutrition, injury prevention, and complementary strength and mobility training. The app syncs with Garmin, Apple Watch, COROS, Fitbit, Suunto, and Strava so completed workouts feed back into the training plan. It holds a 4.9-star rating from more than 76,000 App Store reviews and a 4.7-star rating on Google Play.
- Real-time in-ear coaching is a distinct approach versus static plan apps
- Option to use an actual remote human coach, not just AI
- Training plans cover a full range of distances
- Free trial available before committing
- Plans adapt based on synced workout data
- Wide device and platform compatibility
- Includes strength and mobility work, not just running
- High App Store and Google Play ratings
- Subscription cost adds up compared to free running trackers
- Human coach tier is priced separately and higher
- Newer entrant competing against more established running-coach apps
- Android availability isn't clearly confirmed on the homepage
- No permanent free tier beyond the 7-day trial
- Requires a compatible wearable or Strava account for full benefit
- Subscription-only pricing may be costly for casual runners
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Track runs, get routes, and improve performance with GPS‑powered insights.
The Verdict
AI-generated from listing dataRunna offers adaptive, data‑driven training plans with broad device sync, while Kasi focuses on live audio coaching with AI or human coaches.
Key differences
- •Runna provides a static‑plus‑adaptive plan that updates based on synced workout data; Kasi delivers real‑time audio cues during runs.
- •Runna integrates with six major wearables and Strava; Kasi’s device compatibility is not specified beyond a mobile app.
- •Kasi includes menstrual‑cycle‑aware options and a separate human‑coach tier; Runna does not mention these features.
- •Runna offers a 7‑day free trial only; Kasi mentions a free trial but no duration details.
- •Runna’s pricing is subscription‑only with no free tier; Kasi’s subscription costs may vary with an extra‑priced human coach tier.
Pricing & value
Both are subscription‑based, but Kasi adds a lower‑cost AI tier and optional human coach, offering more pricing granularity.
Ease of use / learning curve
Runna works via familiar mobile app with automatic sync; Kasi requires real‑time audio setup and optional coach selection.
Features & depth
Both cover full distance range and strength work; Runna adds form, nutrition, injury guidance, Kasi adds live audio and menstrual‑cycle options.
Integrations & ecosystem
Runna lists explicit sync with Garmin, Apple Watch, COROS, Fitbit, Suunto, and Strava; Kasi provides no integration details.
Collaboration
Kasi offers remote human coach interaction; Runna relies solely on algorithmic coaching.
Scalability
Runna’s adaptive engine scales across any distance from 5K to ultramarathon without extra tiers.
Support
Kasi mentions in‑app support and a human‑coach tier; Runna’s support details are not specified.
Choose Kasi if…
Runners who value real‑time audio guidance and optional human coaching during workouts.
Choose Runna if…
Runners who want automated, data‑driven plans and broad wearable sync without live coaching.
Common questions
Can I use Runna without a smartwatch?
Runna requires a compatible wearable or Strava account to sync data; without it, plan adaptation is limited.
Does Kasi work on Android phones?
Android availability is not confirmed in the provided facts.
Is there a free tier after the trial for either app?
Runna offers only a 7‑day free trial; Kasi mentions a free trial but no ongoing free tier.