Stay In Shape vs Trainerize: 2026 Comparison

When a personal trainer starts searching for software, Trainerize almost always appears at the top of the results. It has earned its reputation: a decade of development, a massive user base, and a genuinely good mobile experience for clients. But reputation alone does not mean the right fit. This comparison looks at where each tool actually excels — and where it falls short.

Stay In Shape Overview

Stay In Shape is a SaaS platform launched in beta in 2025, built specifically for independent personal trainers. Its core proposition is combining AI-powered program generation and analysis with full business management — scheduling, client portal, nutrition tracking, and invoicing — in one interface.

• Native AI — generates training programs from a client's profile in seconds and automatically detects plateaus in their progress data;
• GDPR compliance — EU hosting, data processing agreement (DPA) included, consent management built in;
• All-in-one — scheduling, client portal, nutrition, and invoicing under one subscription starting at €29/month;
• Modern UI — designed for daily use without a steep learning curve.

Trainerize Overview

Trainerize (now owned by ABC Fitness) is one of the global leaders in fitness coaching software. Founded in 2012, it serves hundreds of thousands of coaches and clients worldwide. Its strengths are well established:

• Native mobile app — one of the best client-facing apps in the industry, with an integrated exercise video library and live session tracking;
• Massive exercise library — thousands of exercises with video demonstrations, ready to use out of the box;
• Third-party integrations — MyFitnessPal, Spotify, Zapier, Stripe, and more;
• Community and resources — active forum, webinars, and solid English support;
• Business plans and gym management — scales from solo coaches to multi-coach studios.

The trade-offs: Trainerize is an Anglo-American product. GDPR compliance is not a headline feature. Invoicing formats for European markets are not native. AI features exist but remain basic compared to newer platforms that have been built with AI at the core.

Feature Comparison

Here is how the two platforms stack up on the criteria that matter most for an independent trainer:

• AI program generation — Stay In Shape: yes (native) · Trainerize: basic
• AI progress analysis — Stay In Shape: yes · Trainerize: no
• GDPR compliance — Stay In Shape: yes (EU hosting, DPA included) · Trainerize: partial
• Client mobile app — Stay In Shape: responsive web portal · Trainerize: native iOS/Android app
• Client portal — Stay In Shape: yes · Trainerize: yes
• Integrated invoicing — Stay In Shape: yes (EU-compliant) · Trainerize: partial (Stripe native, non-EU format)
• Nutrition tracking — Stay In Shape: yes (built-in) · Trainerize: via MyFitnessPal
• Interface language — Stay In Shape: French-first · Trainerize: English-first
• Starting price — Stay In Shape: €29/month · Trainerize: ~$15/month (limited features)
• Product maturity — Stay In Shape: beta 2025 · Trainerize: 10+ years, large community

For a broader framework on evaluating fitness software, see our guide on how to choose personal trainer software.

When to Choose Stay In Shape

• You are an independent trainer in Europe and GDPR compliance is a real concern (health data, sensitive client profiles);
• You want AI to generate and analyze programs so you spend less time on admin and more time coaching;
• You want a single French-language tool that covers scheduling, nutrition, and invoicing without stitching multiple subscriptions together;
• You are starting out and want predictable, affordable pricing with EU-compliant invoicing from day one;
• You prefer being an early adopter who can influence product direction.

When to Choose Trainerize

• A native mobile app for your clients is non-negotiable — polished iOS/Android experience with exercise videos;
• You run a multi-coach studio and need proven, large-scale infrastructure;
• You work in English or with an international client base;
• You rely on MyFitnessPal, Spotify, or other integrations you cannot afford to lose;
• Software maturity and community size matter more to you than native GDPR compliance.

To learn more about how AI is reshaping coaching practice, read our article on the real uses and limits of AI in sports coaching.