Hevy is a workout tracking app for logging strength training sessions, building custom routines, and monitoring progress over time through charts, personal records, and estimated one-rep max calculations. It also includes social features so users can follow other athletes and share workouts within the app's community.
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.
- Free core logging with a highly rated experience (4.9/5 on both app stores)
- Detailed progress tracking including personal records and 1RM estimates
- Smartwatch support for logging without a phone
- Large existing user base of over 15 million athletes
- 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
- Full feature set likely gated behind a premium tier not detailed on the homepage
- Primarily built for strength training, less suited to cardio-focused tracking
- Community/social features may not appeal to users who want a private log
- 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
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The Verdict
AI-generated from listing dataKasi offers real‑time, audio coaching for runners (AI or human) via subscription, while Hevy is a free‑to‑start strength‑training tracker with optional paid upgrades.
Key differences
- •Coaching focus: Kasi provides live audio coaching for runs; Hevy tracks strength workouts only.
- •Pricing model: Kasi is subscription‑only; Hevy is freemium with core features free.
- •Platform scope: Kasi targets runners of all distances with menstrual‑cycle‑aware plans; Hevy targets gym‑goers with set‑logging, rest timers, and smartwatch support.
- •Human interaction: Kasi can connect users to a remote human coach (extra cost); Hevy offers no human coaching.
- •Device ecosystem: Hevy includes Apple Watch and WearOS apps plus desktop web; Kasi only mentions a mobile app.
Pricing & value
Hevy’s core features are free (freemium), whereas Kasi requires a paid subscription for any use.
Ease of use / learning curve
Hevy has a highly rated experience (4.9/5) and simple set‑logging; Kasi adds live coaching which may require more setup.
Features & depth
Kasi delivers real‑time audio coaching, AI or human, menstrual‑cycle‑aware plans, and strength programming; Hevy focuses on strength logging only.
Integrations & ecosystem
Hevy offers Apple Watch, WearOS, and desktop web access; Kasi only lists a mobile app with no API or broader integrations.
Collaboration
Kasi can involve a remote human coach observing biomechanics; Hevy’s community feed is optional and not collaborative coaching.
Support
Kasi provides in‑app support plus a human‑coach tier; Hevy only mentions in‑app support, no dedicated coaching.
Scalability
Hevy serves over 15 million athletes across platforms; Kasi is a newer entrant with limited disclosed user base.
Choose Hevy if…
Gym‑goers or strength‑training enthusiasts who need free set‑logging, smartwatch support, and a large community.
Choose Kasi if…
Runners who want live, audio coaching (AI or human) during workouts and are willing to pay subscription.
Common questions
Can I use Kasi without paying?
No; Kasi is a paid subscription app, though a free trial is offered before committing.
Does Hevy support cardio or running tracking?
Not specified; Hevy is built primarily for strength training and does not list cardio‑specific features.
Is there an API or third‑party integration for either tool?
Kasi: no API listed. Hevy: no API listed, but it offers smartwatch apps and a desktop web portal.