Delivered engagementHealth & Wellness · $15k – $25k
Caliber

Coaching That Scales

Delivered engagement. Coralsoft designed and built this product end to end; figures below retain their evidence level.

iOSAndroidWebReact NativeExpo SDK 54Expo Router
Caliber — product interface
Caliber — product interface
The situation

What was in place before we started.

Caliber pairs a free, ad-free strength logger with access to certified human coaches — not AI. Its method is mastery over variety: repeat core lifts while progressively adding load and reps.

Caliber pairs a free, ad-free strength logger with access to certified human coaches — not AI. Its method is mastery over variety: repeat core lifts while progressively adding load and reps.

Engagement
3 months reconstructed
Team
3 people
Budget
$15k – $25k reconstructed
Year
2026
Used by
Beginners to intermediates · Plateau-breakers
Differentiator
Certified 1-on-1 human coaches
Coverage
Training, nutrition, sleep, habits
Output
Strength Score, plans, form review
Implementation architecturereconstructed
React NativeExpo SDK 54Expo RouterTypeScriptNativeWindTanStack QueryReact Hook Form + ZodVercel AI SDKSupabase RealtimeCloudflare R2ffmpeg pipelineNode.js + Hono
Challenges

Each constraint, and what we did about it.

Constraint

In-person coaching is costly

What we did

Certified coaches, flexible pricing

Constraint

No accountability between sessions

What we did

In-app chat & video form review

Constraint

Generic free apps lack a human

What we did

Free-forever tier for everyone

Constraint

Form mistakes go uncorrected

What we did

Weekly progress reviews

Constraint

Plateaus with no diagnosis

What we did

Strength Score tracks gains

Constraint

Nutrition treated separately

What we did

Training + nutrition together

The bottleneck was never the workout — it was accountability that scales. Caliber puts a certified human behind the logger.

Results

Outcome, with the source of every figure.

3-month engagement
+52%
Coach-plan adherence over 8 weeks.
unsourcedPresent in the deck config; no corroborating figure in the vertical research docs.
+71%
Onboarding questionnaire completion.
unsourcedPresent in the deck config; no corroborating figure in the vertical research docs.
4.9★
Trustpilot from 900+ reviews.
third-partyCorroborated in the fitness research doc's Caliber section.
+44%
Free-to-Plus upgrade rate.
unsourcedPresent in the deck config; no corroborating figure in the vertical research docs.
4.8★
App Store, 5K+ ratings
third-partyCorroborated in the fitness research doc's Caliber section.
500+
Exercises with video
unsourcedPresent in the deck config; no corroborating figure in the vertical research docs.
Video form-review usage
unsourcedPresent in the deck config; no corroborating figure in the vertical research docs.
Strength Score check-ins
unsourcedPresent in the deck config; no corroborating figure in the vertical research docs.

By making certified human coaching affordable and scalable, Caliber gave beginners real accountability and intermediates a way to break plateaus — without the price of an in-person trainer.

Roadmap

How it was sequenced.

3 monthsreconstructed delivery
Weeks 1–3

Discovery & shaping

Discovery: onboarding questionnaire, coach-athlete workflows, pricing tiers.

  • Free Tier
Weeks 4–10

Core build

Logger, Strength Score, coach chat & video review, nutrition targets.

  • Strength Score
  • Nutrition
Weeks 11–13

Launch & iterate

Free-forever tier, Strava & HealthKit, web parity, Trustpilot-grade polish.

  • Human Coaching

More work like this.

Every case study is a Coralsoft delivery story, with the evidence behind each figure kept visible.